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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the direction of electrolyte, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of negative electrode material loss of electrical contact, battery consumption, falling off, etc., to improve high-temperature cycle and high-temperature storage performance effect

Active Publication Date: 2020-04-21
湖南领湃鼎芯电池研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still two key problems that need to be solved during the use of silicon-based negative electrode materials: (1) Silicon materials repeatedly expand and shrink during the lithium-intercalation process, causing the negative electrode materials to pulverize and fall off, and eventually cause the negative electrode materials to lose electrical contact (2) The continuous growth of the solid electrolyte interfacial film (SEI) on the surface of the silicon material will irreversibly consume the limited electrolyte in the battery and lithium from the positive electrode, eventually leading to a rapid decline in battery capacity
At present, the silicon-based materials that are widely used in the market mainly relieve the volume expansion and inhibit the rebound by blending graphite, but this volume expansion problem still exists, and the problems of high-nickel positive electrode materials and silicon-carbon negative electrode materials still need to be further optimized to improve the electrolyte. battery performance

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of high nickel positive electrode silicon carbon negative electrode lithium ion battery electrolyte:

[0048] In a glove box (model Universal (1800 / 750 / 900)) with moisture < 1ppm, put ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, propyl propionate in a volume ratio of 20:40:30:10 well mixed.

[0049] Then, 1.1 mol / L lithium hexafluorophosphate was added to the mixed solvent, and stirred to completely dissolve it.

[0050] Then add succinonitrile, vinylene carbonate, fluoroethylene carbonate, 1,3-propane sultone and lithium difluorophosphate, stir the system evenly, and obtain the high-nickel positive electrode silicon carbon negative electrode lithium ion battery electrolyte.

[0051] Wherein, the quality of succinonitrile accounts for 0.5% of the total mass of the electrolyte, the quality of vinylene carbonate accounts for 0.5% of the total mass of the electrolyte, and the quality of fluoroethylene carbonate accounts for 5% of the total ma...

Embodiment 2

[0059] Preparation of high nickel positive electrode silicon carbon negative electrode lithium ion battery electrolyte:

[0060] In a glove box (model Universal (1800 / 750 / 900)) with moisture <1ppm, ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, propyl propionate in a volume ratio of 20:40:30:10 well mixed.

[0061] Then, 1.1 mol / L lithium hexafluorophosphate was added to the mixed solvent, and stirred to completely dissolve it.

[0062] Then add succinonitrile, vinylene carbonate, fluoroethylene carbonate, 1,3-propane sultone and lithium difluorophosphate, stir the system evenly, and obtain the high-nickel positive electrode silicon carbon negative electrode lithium ion battery electrolyte.

[0063] Wherein, the quality of succinonitrile is promoted to 1% of the total mass of the electrolyte, the quality of vinylene carbonate accounts for 0.5% of the total mass of the electrolyte, and the quality of fluoroethylene carbonate accounts for 5% of the total mass of...

Embodiment 3

[0071] Preparation of high nickel positive electrode silicon carbon negative electrode lithium ion battery electrolyte:

[0072] In a glove box (model Universal (1800 / 750 / 900)) with moisture < 1ppm, put ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, propyl propionate in a volume ratio of 20:40:30:10 well mixed.

[0073] Then, 1.1 mol / L lithium hexafluorophosphate was added to the mixed solvent, and stirred to completely dissolve it.

[0074] Then add succinonitrile, vinylene carbonate, fluoroethylene carbonate, 1,3-propane sultone and lithium difluorophosphate, stir the system evenly, and obtain the high-nickel positive electrode silicon carbon negative electrode lithium ion battery electrolyte.

[0075] Wherein, the quality of succinonitrile accounts for 0.5% of the total mass of the electrolyte, the quality of vinylene carbonate accounts for 1% of the total mass of the electrolyte, and the quality of fluoroethylene carbonate accounts for 5% of the total mass...

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Abstract

The invention provides a lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte comprises a solvent, an electrolyte lithium salt and an additive, wherein the solvent comprises a carbonic ester solvent and a carboxylic ester solvent. According to the total amount of the electrolyte being 100%, the additive comprises the following components in percentage by mass: 0.1-1% of butanedinitrile; 0.1%-1% of vinylene carbonate; 2%-10% of fluoroethylene carbonate; 0.1%-1% of 1, 3-propane sultone; and 0.1%-1% of additive lithium salt. The lithium ion battery electrolyte composed of the mixed solvent, the mixed additive and the electrolyte lithium salt in a specific ratio is adopted so that the high-temperature cycle and high-temperature storage performance of the lithium ion battery can be remarkably improved.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] Because of its high energy density, high power density, long cycle life, no memory effect, low self-discharge rate, wide operating temperature range, safety and reliability, and environmental friendliness, lithium-ion batteries have been used in portable consumer electronics, power tools, medical Electronics and other fields have been widely used, and at the same time, it has also shown good application prospects in fields such as pure electric vehicles, hybrid electric vehicles, and energy storage. [0003] In recent years, the demand for battery energy density in various fields has increased rapidly, and it is urgent to develop lithium-ion batteries with higher energy density. Therefore, the application of ternary positive electrode materials and silicon-carbon neg...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M2300/0037H01M2300/0091Y02E60/10
Inventor 何亚宁李水晶李根雨
Owner 湖南领湃鼎芯电池研究院有限公司
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