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
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...

Examples

Embodiment 1

[0030] This embodiment provides a non-aqueous electrolyte solution for lithium-ion batteries, based on the total mass of the non-aqueous electrolyte solution as 100%, the lithium-ion non-aqueous electrolyte solution includes N, N- Additives of dimethyltrifluoromethanesulfonate sodium salt, 0.2% ethylene glycol dimethyl ether and 0.2% 1,1,2,2-tetrafluoroethyl ethyl ether, the concentration of lithium salt is 1.25mol / L, the composition and mass ratio of lithium salt are lithium hexafluorophosphate / lithium difluorooxalate borate / bistrifluoromethanesulfonylimide lithium=1:1:1, and the balance is a non-aqueous solvent, each solvent composition in the non-aqueous solvent and The mass ratio is ethylene carbonate / ethyl methyl carbonate / diethyl carbonate=1:1:1.

[0031] The preparation method of the lithium-ion battery non-aqueous electrolyte is as follows:

[0032] The electrolyte solution is prepared in a glove box, the argon content in the glove box is 99.999%, the actual oxygen c...

Embodiment 2

[0038] This embodiment provides a non-aqueous electrolyte solution for a lithium-ion battery. Based on the total mass of the non-aqueous electrolyte solution as 100%, the lithium-ion non-aqueous electrolyte solution includes N, N- Dimethyltrifluoromethanesulfonic acid sodium salt, 0.25% ethylene glycol dimethyl ether, 0.2% 1,1,2,2-tetrafluoroethyl ethyl ether additives, the concentration of lithium salt is 1.25mol / L, the composition and mass ratio of lithium salt are lithium hexafluorophosphate / lithium difluorooxalate borate / bistrifluoromethanesulfonylimide lithium=1:1:1, and the balance is a non-aqueous solvent, each solvent composition in the non-aqueous solvent and The mass ratio is ethylene carbonate / ethyl methyl carbonate / diethyl carbonate=1:1:1.

[0039] The preparation method of the lithium-ion non-aqueous electrolyte of this embodiment is the same as that of Embodiment 1, and the compositions and proportions of the non-aqueous electrolyte are as described in this embo...

Embodiment 3

[0042] This embodiment provides a non-aqueous electrolyte solution for lithium-ion batteries, based on the total mass of the non-aqueous electrolyte solution as 100%, the lithium-ion non-aqueous electrolyte solution includes N, N- Additives of dimethyltrifluoromethanesulfonate sodium salt, 0.15% ethylene glycol dimethyl ether, 0.25% 1,1,2,2-tetrafluoroethyl ethyl ether, the concentration of lithium salt is 1.25mol / L, the composition and mass ratio of lithium salt are lithium hexafluorophosphate / lithium difluorooxalate borate / bistrifluoromethanesulfonylimide lithium=1:1:1, and the balance is a non-aqueous solvent, each solvent composition in the non-aqueous solvent and The mass ratio is ethylene carbonate / ethyl methyl carbonate / diethyl carbonate=1:1:1.

[0043] The preparation method of the lithium-ion non-aqueous electrolyte of this embodiment is the same as that of Embodiment 1, and the compositions and proportions of the non-aqueous electrolyte are as described in this embo...