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A kind of fluorine-containing sulfonate electrolyte additive and electrolyte and lithium ion battery containing the additive

An electrolyte and additive technology, which is applied in the field of lithium-ion batteries, can solve problems that cannot be generally achieved, and achieve the effects of suppressing side reactions, improving stability, and ensuring excellent performance

Active Publication Date: 2022-06-21
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution can not generally reach more than 80% when it is expected that 1000 cycles at 45°C

Method used

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  • A kind of fluorine-containing sulfonate electrolyte additive and electrolyte and lithium ion battery containing the additive
  • A kind of fluorine-containing sulfonate electrolyte additive and electrolyte and lithium ion battery containing the additive
  • A kind of fluorine-containing sulfonate electrolyte additive and electrolyte and lithium ion battery containing the additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of electrolyte: Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in a mass ratio of EC:DEC:EMC=1:1:1, and after mixing Add 1 mol of lithium hexafluorophosphate (LiPF 6 ), after the lithium salt was completely dissolved, 0.5% of compound 1 was added.

[0029] 2. Preparation of positive electrode sheet: LiNi ternary material LiNi cobalt manganate 0.6 Co 0.2 Mn 0.2 O 2 , Conductive agent SuperP, binder PVDF and carbon nanotubes (CNT) are mixed uniformly in a mass ratio of 97.5:1.5:1:1 to make a certain viscosity of lithium-ion battery cathode slurry, which is coated on the aluminum foil for current collectors. The coating weight is 324g / m 2 , dried at 85°C, and then cold-pressed; then trimmed, cut, and slitted, dried at 85°C for 4 hours under vacuum conditions after slitting, and welded the tabs to make the positive electrode of the lithium-ion battery that meets the requirements. piece.

[0030] 3. Preparation of ...

Embodiment 10

[0034] 1. Preparation of electrolyte: Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in a mass ratio of EC:DEC:EMC=1:1:1, and after mixing Add 1 mol of lithium hexafluorophosphate (LiPF 6 ), after the lithium salt was completely dissolved, 0.5% of compound 1 was added.

[0035] 2. Preparation of positive electrode sheet: LiCoO, a lithium cobalt oxide material 2 , Conductive agent SuperP, binder PVDF and carbon nanotubes (CNT) are mixed uniformly in a mass ratio of 97.5:1.5:1:1 to make a certain viscosity of lithium-ion battery cathode slurry, which is coated on the aluminum foil for current collectors. The coating weight is 316g / m 2 , dried at 85°C, and then cold-pressed; then trimmed, cut, and slitted, dried at 85°C for 4 hours under vacuum conditions after slitting, and welded the tabs to make the positive electrode of the lithium-ion battery that meets the requirements. piece.

[0036] 3. Preparation of negative electrode sheet: Af...

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Abstract

The invention discloses a fluorine-containing sulfonate electrolyte additive, an electrolyte containing the additive, and a lithium-ion battery. The electrolyte additive includes the following structural formula I, wherein, B can be benzene ring-containing, pyridine-containing, or silyl-containing A kind of; A can be a fluorine-containing alkyl group. The general formula of the fluorine-containing alkyl group in the structural formula is C a f m h n , wherein a=1~6, n≥0, m≥1, m+n=2a+1. The additive will react on both the positive and negative electrodes of the battery, forming a stable interfacial film on the electrode surface, effectively inhibiting the circulation of the electrolyte to produce gas, improving the cycle performance of the electrolyte under high voltage and low-temperature discharge performance, especially ensuring high temperature and high voltage. Excellent performance of lithium-ion battery of lithium cobalt oxide and NCM ternary system.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a fluorine-containing sulfonate electrolyte additive, an electrolyte containing the additive, and a lithium ion battery. Background technique [0002] With the wide application of lithium-ion batteries in portable electronic devices such as mobile phones and notebook computers, the demand for their small size, lightweight and performance improvement has become increasingly significant. In recent years, with the use of lithium-ion batteries as power sources for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and pure electric vehicles (EVs), the development competition for improved performance and reduced costs has intensified. At the same time, research on batteries for solar and wind power generation and energy storage devices continues to heat up, and applications in these fields urgently need to improve the energy density and safety of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 李健辉范伟贞信勇赵经纬
Owner GUANGZHOU TINCI MATERIALS TECH