Patents by Inventor Charan Masarapu
Charan Masarapu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10020491Abstract: Silicon based anode active materials are described for use in lithium ion batteries. The silicon based materials are generally composites of nanoscale elemental silicon with stabilizing components that can comprise, for example, silicon oxide-carbon matrix material, inert metal coatings or combinations thereof. High surface area morphology can further contribute to the material stability when cycled in a lithium based battery. In general, the material synthesis involves a significant solution based processing step that can be designed to yield desired material properties as well as providing convenient and scalable processing.Type: GrantFiled: April 16, 2013Date of Patent: July 10, 2018Assignee: Zenlabs Energy, Inc.Inventors: Yongbong Han, Charan Masarapu, Haixia Deng, Yogesh Kumar Anguchamy, Subramanian Venkatachalam, Herman A. Lopez
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Patent number: 10003068Abstract: High capacity silicon based anode active materials are described for lithium ion batteries. These materials are shown to be effective in combination with high capacity lithium rich cathode active materials. Supplemental lithium is shown to improve the cycling performance and reduce irreversible capacity loss for at least certain silicon based active materials. In particular silicon based active materials can be formed in composites with electrically conductive coatings, such as pyrolytic carbon coatings or metal coatings, and composites can also be formed with other electrically conductive carbon components, such as carbon nanofibers and carbon nanoparticles. Additional alloys with silicon are explored.Type: GrantFiled: September 11, 2015Date of Patent: June 19, 2018Assignee: Zenlabs Energy, Inc.Inventors: Herman A. Lopez, Yogesh Kumar Anguchamy, Haixia Deng, Yongbong Han, Charan Masarapu, Subramanian Venkatachalam, Sujeet Kumar
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Publication number: 20180034039Abstract: Improved high energy capacity designs for lithium ion batteries are described that take advantage of the properties of high specific capacity anode active compositions and high specific capacity cathode active compositions. In particular, specific electrode designs provide for achieving very high energy densities. Furthermore, the complex behavior of the active materials is used advantageously in a radical electrode balancing design that significantly reduced wasted electrode capacity in either electrode when cycling under realistic conditions of moderate to high discharge rates and/or over a reduced depth of discharge.Type: ApplicationFiled: August 29, 2017Publication date: February 1, 2018Inventors: Charan Masarapu, Yogesh Kumar Anguchamy, Yongbong Han, Haixia Deng, Sujeet Kumar, Herman A. Lopez
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Patent number: 9780358Abstract: Improved high energy capacity designs for lithium ion batteries are described that take advantage of the properties of high specific capacity anode active compositions and high specific capacity cathode active compositions. In particular, specific electrode designs provide for achieving very high energy densities. Furthermore, the complex behavior of the active materials is used advantageously in a radical electrode balancing design that significantly reduced wasted electrode capacity in either electrode when cycling under realistic conditions of moderate to high discharge rates and/or over a reduced depth of discharge.Type: GrantFiled: February 26, 2013Date of Patent: October 3, 2017Assignee: Zenlabs Energy, Inc.Inventors: Charan Masarapu, Yogesh Kumar Anguchamy, Yongbong Han, Haixia Deng, Sujeet Kumar, Herman A. Lopez
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Publication number: 20170194627Abstract: Silicon oxide based materials, including composites with various electrical conductive compositions, are formulated into desirable anodes. The anodes can be effectively combined into lithium ion batteries with high capacity cathode materials. In some formulations, supplemental lithium can be used to stabilize cycling as well as to reduce effects of first cycle irreversible capacity loss. Batteries are described with surprisingly good cycling properties with good specific capacities with respect to both cathode active weights and anode active weights.Type: ApplicationFiled: February 6, 2017Publication date: July 6, 2017Inventors: Haixia Deng, Yongbong Han, Charan Masarapu, Yogesh Kumar Anguchamy, Herman A. Lopez, Sujeet Kumar
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Patent number: 9601228Abstract: Silicon oxide based materials, including composites with various electrical conductive compositions, are formulated into desirable anodes. The anodes can be effectively combined into lithium ion batteries with high capacity cathode materials. In some formulations, supplemental lithium can be used to stabilize cycling as well as to reduce effects of first cycle irreversible capacity loss. Batteries are described with surprisingly good cycling properties with good specific capacities with respect to both cathode active weights and anode active weights.Type: GrantFiled: May 16, 2011Date of Patent: March 21, 2017Assignee: Envia Systems, Inc.Inventors: Haixia Deng, Yongbong Han, Charan Masarapu, Yogesh Kumar Anguchamy, Herman A. Lopez, Sujeet Kumar
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Publication number: 20160006021Abstract: High capacity silicon based anode active materials are described for lithium ion batteries. These materials are shown to be effective in combination with high capacity lithium rich cathode active materials. Supplemental lithium is shown to improve the cycling performance and reduce irreversible capacity loss for at least certain silicon based active materials. In particular silicon based active materials can be formed in composites with electrically conductive coatings, such as pyrolytic carbon coatings or metal coatings, and composites can also be formed with other electrically conductive carbon components, such as carbon nanofibers and carbon nanoparticles. Additional alloys with silicon are explored.Type: ApplicationFiled: September 11, 2015Publication date: January 7, 2016Inventors: Herman A. Lopez, Yogesh Kumar Anguchamy, Haixia Deng, Yongbong Han, Charan Masarapu, Subramanian Venkatachalam, Sujeet Kumar
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Patent number: 9190694Abstract: High capacity silicon based anode active materials are described for lithium ion batteries. These materials are shown to be effective in combination with high capacity lithium rich cathode active materials. Supplemental lithium is shown to improve the cycling performance and reduce irreversible capacity loss for at least certain silicon based active materials. In particular silicon based active materials can be formed in composites with electrically conductive coatings, such as pyrolytic carbon coatings or metal coatings, and composites can also be formed with other electrically conductive carbon components, such as carbon nanofibers and carbon nanoparticles. Additional alloys with silicon are explored.Type: GrantFiled: November 3, 2010Date of Patent: November 17, 2015Assignee: Envia Systems, Inc.Inventors: Herman A. Lopez, Yogesh Kumar Anguchamy, Haixia Deng, Yongbong Han, Charan Masarapu, Subramanian Venkatachalam, Sujeet Kumar
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Publication number: 20150311525Abstract: Improved high energy capacity designs for lithium ion batteries are described that take advantage of the properties of high specific capacity anode active compositions and high specific capacity cathode active compositions. In particular, specific electrode designs provide for achieving very high energy densities. Furthermore, the complex behavior of the active materials is used advantageously in a radical electrode balancing design that significantly reduced wasted electrode capacity in either electrode when cycling under realistic conditions of moderate to high discharge rates and/or over a reduced depth of discharge.Type: ApplicationFiled: June 24, 2015Publication date: October 29, 2015Inventors: Charan Masarapu, Haixia Deng, Yongbong Han, Yogesh Kumar Anguchamy, Subramanian Venkatachalam, Sujeet Kumar, Herman A. Lopez
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Patent number: 9139441Abstract: A porous silicon based material comprising porous crystalline elemental silicon formed by reducing silicon dioxide with a reducing metal in a heating process followed by acid etching is used to construct negative electrode used in lithium ion batteries. Gradual temperature heating ramp(s) with optional temperature steps can be used to perform the heating process. The porous silicon formed has a high surface area from about 10 m2/g to about 200 m2/g and is substantially free of carbon. The negative electrode formed can have a discharge specific capacity of at least 1800 mAh/g at rate of C/3 discharged from 1.5V to 0.005V against lithium with in some embodiments loading levels ranging from about 1.4 mg/cm2 to about 3.5 mg/cm2. In some embodiments, the porous silicon can be coated with a carbon coating or blended with carbon nanofibers or other conductive carbon material.Type: GrantFiled: January 19, 2012Date of Patent: September 22, 2015Assignee: Envia Systems, Inc.Inventors: Yogesh Kumar Anguchamy, Charan Masarapu, Haixia Deng, Yongbong Han, Subramanian Venkatachalam, Sujeet Kumar, Herman A. Lopez
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Publication number: 20140370387Abstract: Composite silicon based materials are described that are effective active materials for lithium ion batteries. The composite materials comprise processed, e.g., high energy mechanically milled, silicon suboxide and graphitic carbon in which at least a portion of the graphitic carbon is exfoliated into graphene sheets. The composite materials have a relatively large surface area, a high specific capacity against lithium, and good cycling with lithium metal oxide cathode materials. The composite materials can be effectively formed with a two step high energy mechanical milling process. In the first milling process, silicon suboxide can be milled to form processed silicon suboxide, which may or may not exhibit crystalline silicon x-ray diffraction. In the second milling step, the processed silicon suboxide is milled with graphitic carbon. Composite materials with a high specific capacity and good cycling can be obtained in particular with balancing of the processing conditions.Type: ApplicationFiled: June 13, 2013Publication date: December 18, 2014Inventors: Yogesh Kumar Anguchamy, Haixia Deng, Yongbong Han, Charan Masarapu, Sujeet Kumar, Herman A. Lopez
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Publication number: 20140308585Abstract: Silicon based anode active materials are described for use in lithium ion batteries. The silicon based materials are generally composites of nanoscale elemental silicon with stabilizing components that can comprise, for example, silicon oxide-carbon matrix material, inert metal coatings or combinations thereof. High surface area morphology can further contribute to the material stability when cycled in a lithium based battery. In general, the material synthesis involves a significant solution based processing step that can be designed to yield desired material properties as well as providing convenient and scalable processing.Type: ApplicationFiled: April 16, 2013Publication date: October 16, 2014Inventors: Yongbong Han, Charan Masarapu, Haixia Deng, Yogesh Kumar Anguchamy, Subramanian Venkatachalam, Herman A. Lopez
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Publication number: 20130295439Abstract: Improved high energy capacity designs for lithium ion batteries are described that take advantage of the properties of high specific capacity anode active compositions and high specific capacity cathode active compositions. In particular, specific electrode designs provide for achieving very high energy densities. Furthermore, the complex behavior of the active materials is used advantageously in a radical electrode balancing design that significantly reduced wasted electrode capacity in either electrode when cycling under realistic conditions of moderate to high discharge rates and/or over a reduced depth of discharge.Type: ApplicationFiled: May 4, 2012Publication date: November 7, 2013Inventors: Charan Masarapu, Haixia Deng, Yongbong Han, Yogesh Kumar Anguchamy, Subramanian Venkatachalam, Sujeet Kumar, Herman A. Lopez
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Publication number: 20130189575Abstract: A porous silicon based material comprising porous crystalline elemental silicon formed by reducing silicon dioxide with a reducing metal in a heating process followed by acid etching is used to construct negative electrode used in lithium ion batteries. Gradual temperature heating ramp(s) with optional temperature steps can be used to perform the heating process. The porous silicon formed has a high surface area from about 10 m2/g to about 200 m2/g and is substantially free of carbon. The negative electrode formed can have a discharge specific capacity of at least 1800 mAh/g at rate of C/3 discharged from 1.5V to 0.005V against lithium with in some embodiments loading levels ranging from about 1.4 mg/cm2 to about 3.5 mg/cm2. In some embodiments, the porous silicon can be coated with a carbon coating or blended with carbon nanofibers or other conductive carbon material.Type: ApplicationFiled: January 19, 2012Publication date: July 25, 2013Inventors: Yogesh Kumar Anguchamy, Charan Masarapu, Haixia Deng, Yongbong Han, Subramanian Venkatachalam, Sujeet Kumar, Herman A. Lopez
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Publication number: 20120295155Abstract: Silicon oxide based materials, including composites with various electrical conductive compositions, are formulated into desirable anodes. The anodes can be effectively combined into lithium ion batteries with high capacity cathode materials. In some formulations, supplemental lithium can be used to stabilize cycling as well as to reduce effects of first cycle irreversible capacity loss. Batteries are described with surprisingly good cycling properties with good specific capacities with respect to both cathode active weights and anode active weights.Type: ApplicationFiled: May 16, 2011Publication date: November 22, 2012Inventors: Haixia Deng, Yongbong Han, Charan Masarapu, Yogesh Kumar Anguchamy, Herman A. Lopez, Sujeet Kumar
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Patent number: 8213157Abstract: A supercapacitor comprising a cathode, an anode, a first single-walled carbon nanotube (SWNT) film electrode adjacent the cathode, a second SWNT film electrode adjacent the anode, and separator disposed between the first and second electrodes. The SWNT film electrodes may be manufactured by a non-filtration process comprising depositing the SWNT film on a foil via CVD; separating the SWNT film from the foil; heating the SWNT film; treating the SWNT film with an acid solution; washing the SWNT film; and excising the electrodes from the SWNT film.Type: GrantFiled: April 19, 2010Date of Patent: July 3, 2012Assignee: University of DelawareInventors: Bingqing Wei, Charan Masarapu
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Publication number: 20110111294Abstract: High capacity silicon based anode active materials are described for lithium ion batteries. These materials are shown to be effective in combination with high capacity lithium rich cathode active materials. Supplemental lithium is shown to improve the cycling performance and reduce irreversible capacity loss for at least certain silicon based active materials. In particular silicon based active materials can be formed in composites with electrically conductive coatings, such as pyrolytic carbon coatings or metal coatings, and composites can also be formed with other electrically conductive carbon components, such as carbon nanofibers and carbon nanoparticles. Additional alloys with silicon are explored.Type: ApplicationFiled: November 3, 2010Publication date: May 12, 2011Inventors: Heman A. Lopez, Yogesh Kumar Anguchamy, Haixia Deng, Yongbong Han, Charan Masarapu, Subramanian Venkatachalam, Sujeet Kumar
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Publication number: 20110026189Abstract: A supercapacitor comprising a cathode, an anode, a first single-walled carbon nanotube (SWNT) film electrode adjacent the cathode, a second SWNT film electrode adjacent the anode, and separator disposed between the first and second electrodes. The SWNT film electrodes may be manufactured by a non-filtration process comprising depositing the SWNT film on a foil via CVD; separating the SWNT film from the foil; heating the SWNT film; treating the SWNT film with an acid solution; washing the SWNT film; and excising the electrodes from the SWNT film.Type: ApplicationFiled: April 19, 2010Publication date: February 3, 2011Applicant: University of DelawareInventors: Bingqing Wei, Charan Masarapu