4results about How to "Good high temperature cycle performance" patented technology

This invention relates to the field of electrode materials, specifically to a high-nickel ternary cathode material, its preparation method, and its applications. The high-nickel ternary cathode material comprises a high-nickel ternary material matrix; the surface layer of the high-nickel ternary material matrix includes a spinel structure; the surface layer of the high-nickel ternary material matrix is ​​doped with anions; the anions contain fluorine and / or phosphorus elements. The high-nickel ternary cathode material exhibits good high-temperature cycling performance and high-voltage electrochemical performance.

The invention relates to the technical field of lithium ion batteries, in particular to a high-temperature-resistant electrolyte and a lithium ion battery. The high-temperature-resistant electrolyte comprises a lithium salt, an organic solvent, a film-forming additive and a high-temperature-resistant additive; based on the total mass of the high-temperature-resistant electrolyte being 100%, the content of the high-temperature-resistant additive is 1-5%; the high-temperature-resistant additive is selected from a combination of diphenylphosphonyl hydroxylamine and phenylphosphonyl nitrile. The high-temperature-resistant additive is introduced into the high-temperature-resistant electrolyte provided by the invention, so that a stable and compact SEI film can be formed on the surface of a negative electrode, dendritic crystal growth is inhibited, active lithium loss is reduced, meanwhile, a high-temperature-resistant protective layer is generated on the positive electrode side, and the anti-oxidation stability of a positive electrode interface is effectively improved, so that the electrode interface has compactness and heat resistance; and the interface stability at high temperature is obviously improved, so that the battery applying the composite material has excellent high-temperature cycle performance.

The application discloses a lithium ion battery, which comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, the negative electrode comprises a negative electrode material, the negative electrode material comprises a negative electrode active material and a coating layer, the coating layer comprises an ion-conducting material, and the inorganic component in the coating layer accounts for greater than or equal to 80 wt%; the electrolyte comprises a non-aqueous organic solvent and a lithium salt, the non-aqueous organic solvent comprises a solvent with high dielectric constant and low viscosity and ethylene carbonate, the volume fraction of the solvent with high dielectric constant and low viscosity in the non-aqueous organic solvent is greater than or equal to 10%, and the volume fraction of the ethylene carbonate in the non-aqueous organic solvent is less than or equal to 10%; and the concentration of lithium bisfluorosulfonylimide and / or lithium bis(trifluoromethylsulfonyl)imide in the lithium salt is less than or equal to 0.1 mol / L. By matching the negative electrode material with the specific type of coating layer and the electrolyte with the specific composition, the lithium ion battery has good fast-charging performance, and the risk of explosion and fire during thermal runaway of the battery is reduced.

This invention provides a ternary precursor with a wide particle size distribution, its preparation method, and its applications. The precursor is a high-nickel ternary precursor with spherical or near-spherical secondary particles. Its particle size distribution is unimodal, with D50 of 10-13 μm, Span of 1.0-1.3, D10 of 5-8 μm, and D90 of 16-21 μm. The moderate particle size of this ternary precursor ensures that it does not fly away during processing, is easy to coat, and is fully compatible with existing production lines. The wide-distribution unimodal structure achieves graded filling of particles of varying sizes, significantly reducing electrode porosity, resulting in high compaction density and a substantial increase in battery volumetric energy density. It also avoids the sintering performance mismatch problem caused by multimodal distribution. The spherical morphology provides good flowability and dispersibility, resulting in uniform coating. Furthermore, its small specific surface area reduces electrolyte side reactions and improves cycle stability.