Abstract: Provided are a positive electrode material and a preparation method thereof, and a lithium ion battery. The preparation method includes: performing first mixing on a first lithium source, a metal phthalocyanine complex, a first manganese source, and a first phosphorus source to obtain a first mixed system containing a seed crystal; performing second mixing on the first mixed system, a second lithium source, an iron source, a second manganese source, and a second phosphorus source to obtain a second mixed system containing a precursor; and sintering the second mixed system in a protective atmosphere to obtain a positive electrode material, where a molar ratio of the first lithium source, the first manganese source, and the first phosphorus source is a1:x1:1, a1 is 1.01 to 1.03, and x1 is 0.5 to 0.8; and a molar ratio of the second lithium source, the iron source, the second manganese source, and the second phosphorus source is a2:(1?x2):x2:1, a2 is 1.03 to 1.10, and x2 is 0.5 to 0.8.

Abstract: Provided are an additive, an electrolyte comprising same, and a lithium ion battery. The additive includes [3-(N,N-dimethylamino)propyl]trimethoxysilane and a sulfonyl silane compound, and the sulfonyl silane compound has the structure as represented by formula (I). The additive of the present application can have a relatively low HOMO level and a relatively high LUMO level, and can form a stable interfacial film, thereby effectively isolating an electrolyte from the positive and negative electrodes, avoiding an oxidation reaction between the electrolyte and the positive and negative electrodes, reducing the generation of HF, thus reducing the HF corrosion on the positive electrode, inhibiting the gas production of a battery at a high temperature, and improving the high-temperature storage performance and the high-temperature cycle performance of the battery. The formed interfacial film is compact and rich in inorganic substance, and achieves both low-temperature performance and rate capability.

Abstract: Provided are electrolyte and lithium ion battery. The electrolyte includes an organic solvent, LiPF6, and an additive, the additive includes heptamethyldisilazane and a cyanosilane compound, and the cyanosilane compound has the following structural formula: formula (I), herein n is any one integer from 1 to 6, R1, R2, and R3 are each independently selected from any one or more of substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C1-C10 alkoxy, substituted or unsubstituted C2-C10 alkynyl, substituted or unsubstituted C6-C12 alkylaryl, and (R4)3SiO—, and R4 is selected from any one of substitute or unsubstituted C1-C10 alkyl. The electrolyte may reduce the low-temperature direct current internal resistance of the lithium ion battery, improve the cycle performance of the lithium ion battery, reduce the growth rate of the direct current internal resistance in the cycle process, and effectively improve the stability and safety of the lithium ion battery on the whole.

Abstract: A silicon-carbon composite material, a preparation method thereof, an anode, and a lithium-ion battery are provided. The silicon-carbon composite material includes a matrix and a coating layer. The matrix is a carbon nanotube doped with titanium and nitrogen and has an outer surface and an inner surface. The coating layer coats the outer surface and the inner surface, and the coating layer includes a silicon oxide layer. In one aspect, the polarization of the silicon-carbon composite material is significantly reduced. In another aspect, the silicon oxide layer coating the outer surface and the inner surface of the matrix may be anchored by forming chemical bonds such as N—O—Si and Ti—O—Si with nitrogen and titanium doped into the carbon nanotube, thereby improving the cycle stability of the silicon-carbon composite material. The lithium-ion battery has the advantages of high specific discharge capacity, stable cycle performance, and good rate performance.

Abstract: The present disclosure provides a modified monocrystal high-nickel ternary material, a preparation method therefor and use thereof. The preparation method includes: pre-sintering a high-nickel ternary hydroxide precursor under a condition of pure oxygen to obtain a pre-sintered material; fully mixing the pre-sintered material with a micro-powder of lithium hydroxide, a nano-dopant and an alumina pellet, and subjecting a mixture to a first sintering in a pure oxygen atmosphere after the alumina pellet is removed by sieving, followed by natural cooling in a pure oxygen atmosphere after the first sintering is completed to obtain a first sintered material; crushing the first sintered material, fully mixing it with a nano-coating agent, and then subjecting a mixed material to a second sintering in a pure oxygen atmosphere to obtain a second sintered material; and subjecting the second sintered material to crushing, sieving and demagnetizing to obtain the modified monocrystal high-nickel ternary material.

Abstract: The present disclosure provides a lithium iron phosphate, a preparation method thereof, and an application thereof. The preparation method includes: dispersing a lithium source by using an emulsifier, then adding a first initiator, and carrying out a first polymerization reaction to obtain an intermediate product A; adding a mixed solution of methyl methacrylate, a crosslinking agent and a second initiator to the intermediate product A, and carrying out a second polymerization reaction to obtain an intermediate product B; mixing the intermediate product B, an oxidant, an iron source and a phosphorus source, and carrying out a third reaction to obtain an intermediate product C; and dispersing the intermediate product C by using a glucose solution, and carrying out drying and calcining to obtain the lithium iron phosphate. The lithium iron phosphate has evenly distributed elements, and has good charge and discharge properties.

Abstract: A method for synthesizing lithium titanate includes preparing a supercritical fluid from water; reacting a solution containing lithium and titanium with the supercritical fluid under a condition that maintains the supercritical fluid in its supercritical state to produce a reaction mixture comprising the lithium titanate; and collecting the lithium titanate. The supercritical fluid is prepared at a temperature of 375-500° C. and a pressure of 22-35 MPa. The solution containing lithium and titanium is prepared by mixing a solution containing lithium, prepared by dissolving a lithium source in a selected solvent, and a solution containing titanium, prepared by dissolving a titanium source in the selected solvent, wherein a molar ratio of lithium:titanium is between 4.0:5.0 and 4.5:5.0. The lithium source is lithium hydroxide, lithium carbonate, lithium acetate, lithium oxalate, lithium nitrate, or lithium oxide, and the titanium source is tetrabutyl titanate.

Abstract: A method for preparing a Li4NbxTi5-xO12/C nanocomposite as anode material for lithium-ion batteries is disclosed, which includes the following steps: (a) obtaining a mixture of a lithium salt, niobium pentaoxide, titanium dioxide (TiO2), and a carbon source in a selected stoichiometric ratio; (b) mixing the mixture in a dispersant to produce a slurry; (c) drying the slurry to produce a dried mixture; (d) treating the dried mixture under a protective atmosphere, according to a heating program to produce the Li4NbxTi5-xO12/C nanocomposite, wherein the heating program comprises: calcining the dried mixture at 600° C. for 2-6 hours, heating it at a rate of 2-20° C. per minute to 950-980° C., cooling it by natural cooling to 800-850° C., maintaining the temperature at 800-850° C. for 16 hours, and cooling it by natural cooling to room temperature.

Abstract: A method for synthesizing lithium titanate includes preparing a supercritical fluid from water; reacting a solution containing lithium and titanium with the supercritical fluid under a condition that maintains the supercritical fluid in its supercritical state to produce a reaction mixture comprising the lithium titanate; and collecting the lithium titanate. The supercritical fluid is prepared at a temperature of 375-500° C. and a pressure of 22-35 MPa. The solution containing lithium and titanium is prepared by mixing a solution containing lithium, prepared by dissolving a lithium source in a selected solvent, and a solution containing titanium, prepared by dissolving a titanium source in the selected solvent, wherein a molar ratio of lithium:titanium is between 4.0:5.0 and 4.5:5.0. The lithium source is lithium hydroxide, lithium carbonate, lithium acetate, lithium oxalate, lithium nitrate, or lithium oxide, and the titanium source is tetrabutyl titanate.

Abstract: A method for preparing a Li4NbxTi5-xO12/C nanocomposite as anode material for lithium-ion batteries is disclosed, which includes the following steps: (a) obtaining a mixture of a lithium salt, niobium pentaoxide, titanium dioxide (TiO2), and a carbon source in a selected stoichiometric ratio; (b) mixing the mixture in a dispersant to produce a slurry; (c) drying the slurry to produce a dried mixture; (d) treating the dried mixture under a protective atmosphere, according to a heating program to produce the Li4NbxTi5-xO12/C nanocomposite, wherein the heating program comprises: calcining the dried mixture at 600° C. for 2-6 hours, heating it at a rate of 2-20° C. per minute to 950-980° C., cooling it by natural cooling to 800-850° C., maintaining the temperature at 800-850° C. for 16 hours, and cooling it by natural cooling to room temperature.