4results about How to "Avoid capacity loss" patented technology

This application relates to a high-nickel cathode material and its preparation method, and a lithium-ion battery. The chemical formula of the high-nickel cathode material is Li. σ Ni a Co b Mn c M1 x M2 y M3 z O 2+α Wherein, 0.80<σ<1.20, a+b+c+x+y+z=1, 0.7<a<1.0, 0<b<0.05, 0<c<0.3, 0<x<0.3, 0<y<0.3, 0<z<0.3, 0<α<0.1, M1, M2, and M3 are each independently including at least one of Al, Co, Zr, Ti, Mg, Y, La, Sr, Ba, W, Mo, Nb, and Si, and M1, M2, and M3 are all different; the high-nickel cathode material includes a high-nickel material matrix and a coating layer. Cu-Kα rays are used to perform XRD measurements on the high-nickel material matrix and the high-nickel cathode material, respectively. The intensity of the (104) diffraction peak appearing in the diffraction angle range of 44-45° is recorded as I. b (High-nickel material matrix) and I c (High-nickel cathode material), the unit of diffraction peak intensity is counts, let the diffraction peak intensity difference P = I c -I b 0 < P < 1000. The high-nickel cathode material provided in this application has better high-temperature cycling performance and a low DC internal resistance growth rate.

This invention relates to the field of lithium-ion battery cathode material technology, specifically to a ternary composite doped high-nickel cathode material, its preparation method, and its application. The preparation method of the ternary composite doped high-nickel cathode material includes the following steps: preparing a solution A of nickel, cobalt, and manganese salts; preparing a solution B of aluminum, magnesium, and zirconium salts; in the presence of a precipitant, first performing a first co-precipitation reaction in solution A to generate a core precursor, then adding solution B to perform a second co-precipitation reaction to generate a shell precursor on the core surface, thus obtaining a core-shell structure precursor; mixing it with a lithium source and then performing gradient-segmented sintering, followed by post-treatment to obtain the final product. This invention, by concentrating the ternary composite doping elements in the shell layer, significantly improves the structural and thermal stability of the material while ensuring high capacity. The resulting cathode material exhibits excellent capacity retention and rate performance under high-pressure cycling conditions.

This invention discloses a novel electropolymerizable ionic liquid with an X-Y structure, wherein X includes at least one of aniline, pyrrole, and thiophene, and Y includes at least one of imidazole and pyridine. This ionic liquid allows for the electrochemical polymerization of monomer materials on the cathode surface via an in-situ formation process, achieving electrochemical in-situ coating of the cathode material. This effectively transports lithium ions while avoiding the impact of the high oxidation activity of high-voltage active materials on electrolyte stability, thereby preventing battery capacity loss.

The application discloses a kind of negative electrode material and its preparation method and application, negative electrode material includes: porous Si C, silicon nanometer layer and carbon nanometer layer;Wherein, the layer number of silicon nanometer layer is greater than or equal to 1, the layer number of carbon nanometer layer is greater than or equal to 1;Negative electrode material uses porous Si C as framework, silicon nanometer layer and carbon nanometer layer are spaced distribution in the pore of porous Si C;The pore size of the pore of porous S i C is between 1nm-500nm;The thickness of silicon nanometer layer is between 1nm-50nm;The thickness of carbon nanometer layer is between 1nm-50nm;Lithium battery prepared by using the negative electrode material provided in the embodiment of the application has lower volume expansion rate, higher mass specific capacity, good conductivity and cycle life.