Abstract: The present invention discloses a preparation method to make lithium selenium secondary battery cathode materials with a high energy density and stable electrochemical performances. Two dimensional carbon materials prepared from the presently-disclosed method is not only made from readily-available low-cost raw materials, but is also of simple preparation method. It can effectively shorten the migration distance of lithium ions in the charging and discharging process and improve conductivity and utilization of selenium after compounded with carbon and selenium; the selenium carbon cathode material can be assembled into lithium selenium secondary batteries with high energy density and stable electrochemical performances. By further scaling up, the assembled lithium selenium pouch-cell batteries still hold excellent electrochemical performances and high energy density, showing broad application prospects.

Abstract: The present invention provides a three-dimensional current collector used in a metal secondary battery and the preparation method of said current collector. Said current collector is a three-dimensional porous hollow carbon fiber current collector which has both porous structure and hollow structure and is used to load metal anode, so that lithium dendrites growth can be suppressed and the Coulombic efficiency can be improved. Said current collector is intertwined by micrometer-sized hollow carbon fibers with the diameter of 1 to 50 ?m, the wall thick of 0.5 to 6 ?m, and the pore volume of 0.005 to 0.05 cm3 cm?2.

Abstract: A preparation method of silicon-based composite negative electrode material for a lithium battery includes the following steps: forming steam from a raw material A containing Si and a reducing substance raw material B capable of reacting to generate a silicate under a vacuum heating condition, condensing and depositing in a deposition system after a reaction, and then carrying out carbon coating to obtain the silicon-based composite material. A certain amount of alloy is added into the raw material B, so that a proportion of a crystal region in the silicon-based composite material can be reduced, and the initial coulombic efficiency and the cycling stability of the negative electrode material are further improved.

Abstract: A method for preparing an ultrathin Li complex includes the steps of preparing an organic transition layer on a substrate in advance, and contacting the substrate having transition layer with molten Li in argon atmosphere with H2O?0.1 ppm and O2?0.1 ppm. The molten Li spreads rapidly on the surface of the substrate to form a lithium thin layer. The ultrathin Li layer stores lithium on the current collector beforehand. It can be used as a safe lithium anode to inhibit dendrites.

Abstract: An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

Abstract: An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone. Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery. Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

Abstract: A preparation method of silicon-based composite negative electrode material for a lithium battery includes the following steps: forming steam from a raw material A containing Si and a reducing substance raw material B capable of reacting to generate a silicate under a vacuum heating condition, condensing and depositing in a deposition system after a reaction, and then carrying out carbon coating to obtain the silicon-based composite material. A certain amount of alloy is added into the raw material B, so that a proportion of a crystal region in the silicon-based composite material can be reduced, and the initial coulombic efficiency and the cycling stability of the negative electrode material are further improved.

Abstract: An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone. Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery. Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

Abstract: A method for preparing an ultrathin Li complex includes the steps of preparing an organic transition layer on a substrate in advance, and contacting the substrate having transition layer with molten Li in argon atmosphere with H2O?0.1 ppm and O2?0.1 ppm. The molten Li spreads rapidly on the surface of the substrate to form a lithium thin layer. The ultrathin Li layer stores lithium on the current collector beforehand. It can be used as a safe lithium anode to inhibit dendrites.

Abstract: The present invention related to a method for preparing carbon nanospheres modified current collector and its application in metal secondary battery. The said method includes the preparation of carbon nanospheres modified current collector by chemical vapor deposition process and the process for loading metal into the modified current collector as an anode. Comparing with the bare Ni, the said anode with modified current collector demonstrates enhanced stripping/plating efficiency, well confinement of Li dendrite, stable long lifespan and strengthen safety.

Abstract: An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone. Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery. Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

Abstract: An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone. Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery. Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

Abstract: The present invention provides a three-dimensional current collector used in a metal secondary battery and the preparation method of said current collector. Said current collector is a three-dimensional porous hollow carbon fiber current collector which has both porous structure and hollow structure and is used to load metal anode, so that lithium dendrites growth can be suppressed and the Coulombic efficiency can be improved. Said current collector is intertwined by micrometer-sized hollow carbon fibers with the diameter of 1 to 50 ?m, the wall thick of 0.5 to 6 ?m, and the pore volume of 0.005 to 0.05 cm3 cm?2.

Abstract: Provided is a sulfur-carbon composite comprising a highly graphitic carbon material and sulfur, wherein the carbon material has a high graphitization degree characterized by a ratio of the intensity of G band to the intensity of D band in Raman spectrum being more than 1.0, the material is either a graphitic microporous carbon substrate, or a core-shell material with a conductive core coated by a graphitic microporous carbon layer, and wherein sulfur is encapsulated into the porous structure of the carbon material. Also provided are an electrode and a lithium-sulfur battery comprising the sulfur-carbon composite, and a process for preparing the sulfur-carbon composite.

Abstract: A sulfur-carbon composite includes micro-porous carbon nanosheets and sulfur. The sulfur is loaded into the micropores of the micro-porous carbon nanosheets. The sulfur-carbon composite can be included in an electrode material. The sulfur-carbon composite can be included in a lithium-sulfur battery. A process for preparing the sulfur-carbon composite includes carbonization-activation of carbonaceous precursor, purification, and loading of sulfur into micro-porous carbon nanosheets.

Abstract: The present invention discloses a preparation method to make lithium selenium secondary battery cathode materials with a high energy density and stable electrochemical performances. Two dimensional carbon materials prepared from the presently-disclosed method is not only made from readily-available low-cost raw materials, but is also of simple preparation method. It can effectively shorten the migration distance of lithium ions in the charging and discharging process and improve conductivity and utilization of selenium after compounded with carbon and selenium; the selenium carbon cathode material can be assembled into lithium selenium secondary batteries with high energy density and stable electrochemical performances. By further scaling up, the assembled lithium selenium pouch-cell batteries still hold excellent electrochemical performances and high energy density, showing broad application prospects.

Abstract: Disclosed is method of preparing a selenium carbon composite material and a use of the selenium carbon composite material in a cathode of a lithium selenium secondary battery. A battery formed with a cathode of the disclosed selenium carbon composite material has high energy density and stable electrochemical performance. The disclosed selenium carbon composite material can effectively shorten the migration distance of lithium ions during charging and discharging of the battery and improve conductivity and utilization of selenium after compounding carbon and selenium. Multiple batteries formed with cathodes of the disclosed selenium carbon composite material can be assembled into a lithium selenium pouch-cell battery having stable electrochemical performance and high energy density.

Abstract: An electrode additive comprising an electrochemically active material in a form of one-dimensional molecular chain is disclosed wherein the electrochemically active material is contained inside a nanotube-formed conductive shell material. An electrode comprising said electrode additive, and the uses of said electrode additive and said electrode are also disclosed.

Abstract: An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone. Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery. Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

Abstract: The present invention related to a method for preparing carbon nanospheres modified current collector and its application in metal secondary battery. The said method includes the preparation of carbon nanospheres modified current collector by chemical vapor deposition process and the process for loading metal into the modified current collector as an anode. Comparing with the bare Ni, the said anode with modified current collector demonstrates enhanced stripping/plating efficiency, well confinement of Li dendrite, stable long lifespan and strengthen safety.