Lithium-ion battery electrolytes, lithium-ion batteries, and electrochemical equipment
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- AESC JAPAN LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-12
AI Technical Summary
【0015】 以上をまとめ、本発明はリチウムイオン電池の電解液、リチウムイオン電池、及び電気化学機器を提供する。第一添加剤と第二添加剤としてのジフルオロビス(オキサラト)リン酸リチウムを共用することにより、分子間作用を通じてジフルオロビス(オキサラト)リン酸リチウムの溶解性を増強することができる。第一添加剤における不飽和結合はP-F結合の切断によって生じるF-を捕捉し、C-F共有結合を形成し、さらに正極側で鎖の付加反応を起こし、正極界面の安定性を向上させる。電解液におけるH+を中和し、電解液の酸性化を避け、非水溶媒の分解によるガス発生を減少させ、さらに正極からの遷移金属の溶出と構造崩壊を防ぎ、正極における遷移金属イオンをHF腐食から保護する。第一添加剤とジフルオロビス(オキサラト)リン酸リチウムを併用することで、両者の利点を十分に発揮し、正極-電解質界面と負極-電解質界面の品質を向上させ、リチウムイオン電池の低温インピーダンスを効果的に低下させ、電池の低温性能を向上させると同時に、高温性能とガス発生性能を両立することができる。
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Abstract
Claims
1. The electrolyte for lithium-ion batteries, Non-aqueous solvents and Lithium salts and An additive comprising a first additive selected from the compounds represented by formula (I), and a second additive containing lithium difluorobis(oxalato)phosphate, It includes at least, The content of the first additive in the electrolyte is 0.1 wt% to 3 wt%, An electrolyte for a lithium-ion battery, characterized in that the content of the second additive in the electrolyte is 0.1 wt% to 3 wt%. 【Chemistry 1】 (R １ , R ２ , R ３ , R ４ Each of these substituents has 1 to 3 carbon atoms, a degree of unsaturation of 0 to 4, and 0 to 3 heteroatoms. The heteroatoms are at least one selected from nitrogen, phosphorus, or sulfur, and n is 0 to 2.
2. R １ , R ２ , R ３ , R ４ The electrolyte for a lithium-ion battery according to claim 1, characterized in that each of them is an alkyl group, an alkenyl group, an alkynyl group, or an amino group.
3. The content of the first additive in the electrolyte is 0.1 wt% to 0.5 wt%, The content of the second additive in the electrolyte is 0.5 wt% to 1 wt%, The electrolyte for a lithium-ion battery according to claim 1, characterized in that the mass ratio of the second additive to the first additive is 1.5:1 to 2:
1.
4. The electrolyte for a lithium-ion battery according to claim 1, characterized in that the first additive is at least one selected from the compounds shown in Compound 1, Compound 2, Compound 3, or Compound 4 below. 【Chemistry 2】
5. The non-aqueous solvent is at least one selected from carbonate esters, carboxylic acid esters, ethers, or nitriles. The carbonate ester is at least one selected from ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, or diethyl carbonate. The carboxylic acid ester is at least one selected from ethyl formate, ethyl acetate, propyl acetate, or ethyl propionate. The aforementioned ethers are at least one selected from 1,2-dimethoxyethane or ethylene glycol diethyl ether. The nitriles are at least one selected from acetonitrile, propionitrile, butyronitrile, or valeronitrile. The electrolyte for a lithium-ion battery according to claim 1, characterized in that the content of the non-aqueous solvent in the electrolyte is 70 wt% to 85 wt%.
6. The lithium salt is at least one selected from lithium hexafluorophosphate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethyl)sulfonylimide, lithium acetate, lithium methylsulfonate, or lithium trifluoromethylsulfonate. The electrolyte for a lithium-ion battery according to claim 1, characterized in that the content of the lithium salt in the electrolyte is 12 wt% to 16 wt%.
7. Lithium-ion battery, Positive electrode sheet and Negative electrode sheet and An electrolyte selected from the lithium-ion battery electrolytes described in any one of claims 1 to 6, A lithium-ion battery characterized by containing at least [a certain substance].
8. The positive electrode active material in the positive electrode sheet is Li ｘ [Ni ｙ Co ｚ Mn ｔ M （１－ｙ－ｚ－ｔ） O ２－δ and includes, M is at least one of Cr, Zr, Ca, Mg, Cu, Ti, Al, Mo, W, or Zn, 0.9 < x < 1.1, 0.65 ≤ y < 1.0, 0 ≤ z < 0.5, 0 ≤ t < 0.5, 0 ≤ δ ≤ 0.1, The lithium-ion battery according to claim 7, characterized in that the negative electrode active material in the negative electrode sheet includes at least one of graphite, silicon oxide material, or silicon carbon material.
9. An electrochemical apparatus characterized by comprising the lithium-ion battery described in claim 7.