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: 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.