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Non-aqueous electrolyte for high-voltage lithium ion battery and lithium ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems that limit the development of high-voltage lithium-ion batteries, achieve improved kinetic characteristics, enrich chemical Composition, effect of improving high and low temperature performance

Inactive Publication Date: 2021-03-05
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the working voltage can increase the energy density of lithium-ion batteries, but the oxidation and decomposition of ordinary electrolytes under high voltage limits the development of high-voltage lithium-ion batteries

Method used

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  • Non-aqueous electrolyte for high-voltage lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte for high-voltage lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte for high-voltage lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Electrolyte preparation:

[0025] In a glove box filled with argon (oxygen content ≤ 1ppm, water content ≤ 1ppm), ethylene carbonate EC, fluoroethylene carbonate FEC, ethyl methyl carbonate EMC, divinyl carbonate DEC, propyl acetate EP and The volume ratio of 20:10:30:20:20 is mixed evenly and stirred continuously, and LiPF with a total mass of electrolyte of 12.5% ​​is added to the mixed solution 6 . Subsequently, compound 1 with 1% of the total mass of the electrolyte, ADN with 1% of the total mass of the electrolyte, and 1,3-propane sultone PS with 1% of the total mass of the electrolyte were added to the mixed solution, and stirred to completely dissolve it to obtain The electrolyte of embodiment 1.

[0026] Preparation of lithium-ion batteries:

[0027] The cathode active material LiCoO 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride are fully stirred and mixed in the N-methylpyrrolidone system according to the mass ratio of 95:...

Embodiment 2-15

[0039] In Examples 2-15, except that the electrolyte solvent, additive composition and content are added as shown in Table 1, the others are the same as in Example 1.

[0040] The electrolyte composition of table 1 embodiment 1-15

[0041]

[0042]

Embodiment 16-30

[0044] The battery system of Examples 16-30 is LiNi 0.6 co 0.2 mn 0.2 o 2 / Si (15%) C (85%), other components such as electrolyte solvent, additive composition, content are the same as those of Examples 1-15, specifically added as shown in Table 1. In the performance test method, charge at 1C constant current and constant voltage to 4.35V to test the normal temperature and low temperature cycle performance and high temperature storage performance.

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Abstract

The invention belongs to the technical field of batteries, and discloses a non-aqueous electrolyte for a high-voltage lithium ion battery and the lithium ion battery. The non-aqueous electrolyte for the high-voltage lithium ion battery comprises a non-aqueous organic solvent, an electrolyte and a film-forming additive, wherein the film-forming additive contains a negative electrode film-forming additive and a fluorine-containing phosphate additive as shown in a structural formula 1. In the electrolyte, the HOMO energy of the fluorine-containing phosphate compound shown in the structural formula 1 is higher than that of ethylene carbonate, and the fluorine-containing phosphate compound preferentially undergoes an oxidation reaction on the surface of a ternary material to form a stable and compact CEI film, so the oxidation reaction of the electrolyte on the surface of an electrode is reduced; meanwhile, the interface film with low impedance is formed on the surface of the negative electrode, so the dynamic characteristics inside the battery can be improved, and the cycle life is prolonged; the negative electrode film-forming additive such as ethylene sulfate is preferentially reduced and decomposed on the surface of the negative electrode to form an excellent solid electrolyte membrane, so that the chemical composition of the SEI membrane is enriched, the impedance is adjusted,and the high-low temperature performance, the rate capability and the storage performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a non-aqueous electrolytic solution for a high-voltage lithium-ion battery and the lithium-ion battery. Background technique [0002] With the advancement of science and technology, people's requirements for the quality of living environment are constantly improving, and the environmental pollution caused by the depletion and consumption of fossil energy is becoming more and more serious. The research and development of clean and renewable new energy has become a top priority. At present, a large number of new energy sources have been developed and used, such as solar energy, wind energy, tidal energy and geothermal energy, etc., but these energy sources are limited in time and space, and require proper conversion and storage before they can be used. [0003] Lithium-ion battery, as a green and high-energy battery, is the most ideal and most potential rechargeable battery in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 王建斌杨艳茹黄慧聪朱学全郭力
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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