Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of lowering the charging and discharging efficiency of lithium-ion batteries, worsening performance at room temperature and high temperature, and restricting the development of lithium-ion batteries, so as to improve cycle performance and high-temperature performance. , the effect of improving high temperature storage performance and improving cycle performance

Active Publication Date: 2019-09-20
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the solvent content with low melting point and low viscosity is increased, the low temperature performance of the battery will be improved, but the normal temperature and high temperature performance will be deteriorated, and the three cannot be balanced
In addition, the carbonate-based electrolyte of conventional lithium-ion batteries is easily decomposed at high voltage, and will be oxidized at higher voltage to produce CO, CO 2 And organic substances such as ester bonds and hydroxyl groups, under low voltage, will decompose on the surface of the negative electrode to generate olefin gas, and the generated gas will stay between the positive and negative electrodes, causing a sharp decline in battery performance and will also pose a threat to the safety of the battery Threat, leading to lower charge and discharge efficiency of lithium-ion batteries, poor cycle performance, restricting the further development of high-voltage lithium-ion batteries

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

[0035] Electrolyte preparation:

[0036] In a nitrogen-filled glove box (O 2 2 (01 , functional additive A 2 , functional additive A 3 , to obtain a mixed solution; then slowly add lithium hexafluorophosphate, lithium difluorooxalate borate, and lithium difluorooxalate phosphate mixture to the mixed solution to prepare a 1.2mol / L lithium salt solution, wherein lithium hexafluorophosphate accounts for 13.0% of the total mass of the electrolyte, After mixing evenly, the electrolyte solution is made.

[0037] Positive electrode preparation: The high-voltage 4.4V positive electrode active material ternary 523 (purchased from Zhenhua), CNTs (carbon nanotubes), conductive carbon and PVDF (polyvinylidene fluoride) were mixed uniformly according to the mass ratio of 98.0:0.5:0.3:1.2 , and then dispersed in N-methyl-2-pyrrolidone (NMP) to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on both sides of the aluminum foil, and the positive electrod...

Embodiment 2

[0041] Different from Example 1 is the preparation of electrolyte,

[0042] In a nitrogen-filled glove box (O 2 2 (01 , to obtain a mixed solution; then slowly add lithium hexafluorophosphate, lithium difluorooxalate borate, and lithium difluorooxalate phosphate mixture to the mixed solution to prepare a 1.2mol / L lithium salt solution, wherein lithium hexafluorophosphate accounts for 13.0% of the total mass of the electrolyte, After mixing evenly, the electrolyte solution is made.

[0043] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0045] Different from Example 1 is the preparation of electrolyte,

[0046] In a nitrogen-filled glove box (O 2 2 (02 , to obtain a mixed solution; then slowly add lithium hexafluorophosphate, lithium difluorooxalate borate, and lithium difluorooxalate phosphate mixture to the mixed solution to prepare a 1.2mol / L lithium salt solution, wherein lithium hexafluorophosphate accounts for 13.0% of the total mass of the electrolyte, After mixing evenly, the electrolyte solution is made.

[0047] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a functional additive A and an auxiliary additive, the functional additive A is provided with at least two sulfonic acid estersil groups or the functional additive A is provided with at least one sulfonic acid estersil group and at least one phosphoric acid estersil group or boric acid estersil group. The lithium ion battery prepared by the lithium ion battery electrolyte is excellent in positive / negative film formation, and the requirements of long cycle lifetime, good rate performance and adaptability to high- and low-temperature environment of the battery under high voltage are met.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] At present, with the shortage of global oil resources and the continuous deterioration of the climate environment, the development of human society is facing severe challenges. The development of clean and energy-saving new energy vehicles is highly valued by countries all over the world. Lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, wide operating voltage range, long service life, and no environmental pollution. They are widely used in portable electronic devices and are also promoted in fields such as electric vehicles. At the same time, consumers have also put forward higher requirements for battery energy density, cycle life and environmental applicability. [0003] Electrolyte is an important carrie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 高学友朱坤庆夏小勇庞佩佩计阳楚英张涛
Owner 东莞维科电池有限公司
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