Abstract: The present application discloses a positive electrode active material, comprising a lithium nickel manganese oxide modified material and a coating layer on the surface of the lithium nickel manganese oxide modified material. The lithium nickel manganese oxide modified material is a primary particle with a core-shell-like structure comprising a spinel phase and a rocksalt-like structure phase. The spinel phase is an inner core, and the rocksalt-like structure phase constitutes an outer shell. The rocksalt-like structure phase is further doped with a phosphorus element and the phosphorus element is distributed in a gradient from the outer surface to the interior of the rocksalt-like structure phase. The present application further discloses a preparation method of the positive electrode active material, a positive electrode containing the positive electrode active material for lithium-ion secondary batteries, and a lithium ion secondary battery.

Abstract: Embodiments of the present disclosure are a pitch-based negative electrode material for a sodium-ion battery and related methods and applications. The method comprises: placing a pitch recursor into a muffle furnace to allow the pitch precursor to experience pre-oxidation for 2 to 6 hours at a temperature ranging from 200° C. to 350° C., to obtain pre-oxidized pitch; placing the pre-oxidized pitch into a high-temperature carbonization furnace, and increasing the temperature to 1300° C. to 1600° C. at a temperature increase speed of 0.5° C./min to 5° C./min, and carrying out thermal treatment on the pre-oxidized pitch in an inert atmosphere for 1 to 10 hours, to allow the pre-oxidized pitch to experience carbonization reactions, oxygen in the pre-oxidized pitch being used for breaking an ordered structure of the pitch during the carbonization of the pre-oxidized pitch, so as to form a wedge-shaped voids disordered structure.

Abstract: Provided is a prelithiation material, comprising a lithium-containing compound and an inorganic non-metallic reductive agent. Further provided is a method for preparing the prelithiation material of the present invention. Further provided is use of the prelithiation material of the present invention in a lithium ion battery. By mixing the prelithiation material provided by the present invention with a positive electrode material or coating the side of a separator near the positive electrode with the same, a battery is assembled, and during first cycle, active lithium can be released so as to compensate active lithium lost from a negative electrode. The prelithiation material provided by the present invention has a good compatibility with currently commercially available positive and negative electrodes, and is very suitable for current secondary lithium ion batteries.

Abstract: This invention relates to a double layer composite-coated nano-silicon negative electrode material, and its preparation methods and use, the negative electrode material comprising: a silicon-based nanoparticle, a copper layer coated on the surface of the silicon-based nanoparticle, and a conductive protective layer coated on the surface of the copper layer. Nano-copper has superplastic ductility and conductivity, and the prior art has proved that lithium ions can penetrate nano-copper; therefore, the copper coating layer has effects of inhibiting the volume expansion of the silicon-based nanoparticle and keeping the silicon-based nanoparticle from cracking so that direct contact between the silicon-based nanoparticle and an electrolyte is effectively avoided and a stable SEI is formed, and increasing the conductivity of the electrode.

Abstract: The invention provides a composite-coated nano-tin negative electrode material, which comprises a tin-based nanomaterial, a nano-copper layer coated on the surface of the tin-based nanomaterial and a conductive protective layer coated on the surface of the nano-copper layer. The nano-copper layer can inhibit the volume expansion of nano-tin, keep the nano-tin material from cracking, avoid direct contact between nano-tin and electrolyte to form stable SEI and increase the conductivity of the electrode. Coating a conductive layer on the surface of the nano-copper layer can effectively inhibit the oxidation of nano-copper, thus improving its electrochemical performance. The composite-coated nano-tin negative electrode material according to the invention is used as a negative electrode material of a lithium-ion battery, has excellent electrochemical performance, and has potential application prospects in portable mobile devices and electric vehicles.

Abstract: Embodiments of the present disclosure are a pitch-based negative electrode material for a sodium-ion battery and related methods and applications. The method comprises: placing a pitch recursor into a muffle furnace to allow the pitch precursor to experience pre-oxidation for 2 to 6 hours at a temperature ranging from 200° C. to 350° C., to obtain pre-oxidized pitch; placing the pre-oxidized pitch into a high-temperature carbonization furnace, and increasing the temperature to 1300° C. to 1600° C. at a temperature increase speed of 0.5° C./min to 5° C./min, and carrying out thermal treatment on the pre-oxidized pitch in an inert atmosphere for 1 to 10 hours, to allow the pre-oxidized pitch to experience carbonization reactions, oxygen in the pre-oxidized pitch being used for breaking an ordered structure of the pitch during the carbonization of the pre-oxidized pitch, so as to form a wedge-shaped voids disordered structure.

Abstract: The present invention provides a sulfur-based positive electrode active material for use in a solid-state battery, comprising: 30-80 wt % of Li2S, 10-40 wt % of one or more second lithium compounds selected from LiI, LiBr, LiNO3, and LiNO2, and 0-30 wt % of a conductive carbon material; a method for preparing the sulfur-based positive electrode active material, a positive electrode including the sulfur-based positive electrode active material, and a solid-state battery including the positive electrode. The sulfur-based positive electrode active material and the positive electrode provide a high specific capacity and an increased discharge voltage.

Abstract: This invention relates to a double layer composite-coated nano-silicon negative electrode material, and its preparation methods and use, the negative electrode material comprising: a silicon-based nanoparticle, a copper layer coated on the surface of the silicon-based nanoparticle, and a conductive protective layer coated on the surface of the copper layer. Nano-copper has superplastic ductility and conductivity, and the prior art has proved that lithium ions can penetrate nano-copper; therefore, the copper coating layer has effects of inhibiting the volume expansion of the silicon-based nanoparticle and keeping the silicon-based nanoparticle from cracking so that direct contact between the silicon-based nanoparticle and an electrolyte is effectively avoided and a stable SEI is formed, and increasing the conductivity of the electrode.

Abstract: The invention provides a composite-coated nano-tin negative electrode material, which comprises a tin-based nanomaterial, a nano-copper layer coated on the surface of the tin-based nanomaterial and a conductive protective layer coated on the surface of the nano-copper layer. The nano-copper layer can inhibit the volume expansion of nano-tin, keep the nano-tin material from cracking, avoid direct contact between nano-tin and electrolyte to form stable SRI and increase the conductivity of the electrode. Coating a conductive layer on the surface of the nano-copper layer can effectively inhibit the oxidation of nano-copper, thus improving its electrochemical performance. The composite-coated nano-tin negative electrode material according to the invention is used as a negative electrode material of a lithium-ion battery, has excellent electrochemical performance, and has potential application prospects in portable mobile devices and electric vehicles.

Abstract: The present invention provides a spinel-structured cathode active material, comprising lithium-containing compound particles having a chemical formula of LiNi0.5?xMn1.5?y{A}uOz and a first metal oxide and a second metal oxide coated on the surface of the lithium-containing compound particles, wherein the first metal oxide is an oxide of a metal having a valence of four or higher than four, and partially covers on the surface of the lithium-containing compound particles as a coating material; the second metal oxide is an oxide of a metal having a valence of lower than four, and the other areas on the surface of the lithium-containing compound particles that are not covered by the first metal oxide are coated with the second metal oxide in a thickness of 1-20 nm or forms a shallow gradient solid solution with a depth of less than 200 nm. When the cathode active material is applied to a lithium ion secondary battery, it has better cycling stability than an uncoated lithium transition metal oxide.

Abstract: The present invention discloses a layered copper-containing oxide material and a preparation process and purpose thereof The material has a general chemical formula of Na0.68+aNibCucMdMneO2+?, where Ni, Cu, M, and Mn respectively form octahedral structures together with six oxygen atoms that are most adjacent therein, the octahedral structures have arrangements with common edges and constitute transition metal layers; alkali metal ions Na+ are located between every two of the transition metal layers; M is specifically one or more of Mg2+, Mn2+, Zn2+, Co2+, Al3+, B3+, Cr3+, Mn3+, Co3+, V3+, Zr4+, Ti4+, SiO4+, Mo4+, Ru4+, Nb4+, Sb5+, Nb5+, Mo6+, and Te6+; and a, b, c, d, e, ?, and m meet (0.68+a)+2(b+c)+md+4e=2(2+?), and b+c+d+e=1.

Abstract: A kind of pyrolyzed hard carbon material, preparation and its applications are involved in this patent. The particle of this material has spherical or ellipsoidal morphology with smooth surface. The average particle size is in the range of 0.05/100 microns and the coarseness is not more than 0.5% of the particle size. The BET specific surface area is from 1 to 4000 square meters per gram. The inner pore size of the material is distributed between 0.3 and 50 nanometers, and the values of Le and La are from 1 to 20 nanometers. The real density of the material is from 0.8 to 2.2 grams per cubic centimeter and the tap density is 0.35/1.5 grams per cubic centimeter. The preparation of the material can be described as follows: firstly the precursors are mixed with solvents for homogenous distribution systems, then the mixtures are put into autoclave for dewatering. ollowing with washing, filtrating, drying and high-temperature treatment, the hard carbon material is obtained.