Lithium ion battery non-aqueous electrolyte and lithium ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of inability to form SEI film, unstable SEI film, volume expansion of silicon negative electrode, etc., to improve the capacity retention rate , to achieve highly reversible cycle, avoid the effect of lithium metal powder
CN114094166APending Publication Date: 2022-02-25北京胜能能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
北京胜能能源科技有限公司
Publication Date
2022-02-25

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Abstract

The invention provides a lithium ion battery non-aqueous electrolyte and a lithium ion battery. The lithium ion battery non-aqueous electrolyte comprises an electrolyte, a non-aqueous solvent and an additive, wherein the additive comprises a sulfonate additive and an ether compound. The invention provides the lithium ion battery non-aqueous electrolyte which is prepared by compounding the sulfonate additive and the ether compound additive so that side reaction, stress corrosion cracking, transition metal dissolution and impedance increase between a positive electrode material and the electrolyte can be inhibited; and the non-aqueous electrolyte of the lithium ion battery can also avoid the problem of lithium metal pulverization in the lithium supplement process of a silicon-carbon negative electrode, then the highly reversible circulation of lithium metal is realized, the stable circulation of the lithium ion battery is realized, and the reversible specific capacity of a ternary positive electrode material and the first coulombic efficiency of a silicon negative electrode material are remarkably improved.
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Description

technical field

[0001] The invention belongs to the field of batteries, and in particular relates to a non-aqueous electrolyte solution of a lithium ion battery and a lithium ion battery. Background technique

[0002] Lithium-ion batteries with high energy density are currently in demand for portable electronic devices, drones, and electric vehicles. The mass energy density of Li-ion batteries based on graphite anodes can reach about 280 Wh / kg. In order to further increase the mass energy density of the battery to more than 350-400Wh / kg, most lithium-ion batteries use silicon-oxygen or silicon-carbon as the negative electrode material and high-nickel ternary positive electrode material (LiNi 0.8 mn 0.1 co 0.1 ) as the cathode material.

[0003] As a material with high element abundance in nature, silicon has a specific capacity as high as 3590mgA / g, so it is expected to replace the carbon anode material widely used in commercial lithium-ion batteries. However, on the on...

Claims

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