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Method for improving cycle stability of battery by using bimetallic coupling agent

A bimetallic coupling agent and battery cycle technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery cycle stability, achieve enhanced cycle stability, improve cycle stability performance, and reduce cracks Effect

Active Publication Date: 2019-05-28
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the defects of poor battery cycle stability in the prior art, the object of the present invention is to provide a bimetallic coupling agent and a method for improving battery cycle performance by using the coupling agent

Method used

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  • Method for improving cycle stability of battery by using bimetallic coupling agent
  • Method for improving cycle stability of battery by using bimetallic coupling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Heat the aluminum-titanium coupling agent to 110°C to make it liquid, and mix it with the NCM811 positive electrode material for 4 hours at this temperature, wherein the mass ratio of the aluminum-titanium composite coupling agent to the NCM811 positive electrode material is 0.03:1, and then add Conductive carbon black super p mixed with binder PVDF, among which, according to the mass ratio, NCM811 positive electrode material: super p: PVDF = 8:1:1; after stirring for 6 hours, coating, and drying at 80°C for 10 hours, the battery pole After the production is completed, the NCM811 electrode material modified by the aluminum-titanium composite coupling agent is obtained.

Embodiment 2

[0025] Heat the aluminum-titanium composite coupling agent to 120°C to make it liquid, and mix it with the NCM811 positive electrode material for 6 hours at this temperature, wherein the mass ratio of the aluminum-titanium composite coupling agent to the NCM811 positive electrode material is 0.01:1, and then add Conductive carbon black super p mixed with binder PVDF, among which, according to the mass ratio, NCM811 positive electrode material: super p: PVDF = 8:1:1; after stirring for 6 hours, coating, and drying at 80°C for 12 hours, the battery pole piece After the production is completed, the NCM811 electrode material modified by the aluminum-titanium composite coupling agent is obtained.

Embodiment 3

[0027] Heat the aluminum-titanium composite coupling agent to 140°C to make it liquid, and mix it with the NCM811 positive electrode material for 4 hours at this temperature, wherein the mass ratio of the aluminum-titanium composite coupling agent to the NCM811 positive electrode material is 0.05:1, and then add Conductive carbon black super p mixed with binder PVDF, among them, according to the mass ratio, NCM811 positive electrode material: super p: PVDF = 8:1:1; after stirring for 6 hours, coating, and drying at 80°C for 8 hours, the battery pole piece After the production is completed, the NCM811 electrode material modified by the aluminum-titanium composite coupling agent is obtained.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for improving the cycle stability of a battery by using a bimetallic coupling agent. The method includes the steps of heating the bimetal coupling agent to be in a liquid state; uniformly mixing with an electrode material to obtain the electrode material modified by the bimetallic coupling agent; wherein the bimetallic coupling agent is an aluminum-titanium composite coupling agent or / and an aluminum-zirconium composite coupling agent, and the molecular formulas of the aluminum-titaniumcomposite coupling agent and the aluminum-zirconium composite coupling agent are (R1O) Al (OOCR2) m. (R1O) Ti (OOCR2) n and (R1O) Al (OOCR2) m. (R1O) Zr (OCR2) n respectively. The wrapping layer formed on the surface of the electrode material modified by the bimetallic coupling agent prepared by the invention can effectively reduce the contact between the electrode material and an electrolyte, reduce the formation of an SEI film, and improve the cycling stability of a battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a bimetallic coupling agent and a method for improving battery cycle performance by using the coupling agent. Background technique [0002] The organic electrolyte is an important part of the lithium-ion battery. It is responsible for the transmission of charges between the positive and negative electrodes in the battery. The electrolyte is generally composed of two parts: electrolyte lithium salt and organic solvent. The electrolyte lithium salt used in commercial lithium-ion batteries is generally lithium hexafluorophosphate, and the organic solvent is generally a mixed solvent composed of two or more organic solvents, mainly EC (ethylene carbonate), PC (propylene carbonate), DMC (carbonic acid Dimethyl ester), DEC (diethyl carbonate), EMC (ethyl methyl carbonate) and other chain and cyclic carbonates. The formula composition, water content, hydrofluo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 庄严张韦关明云刘维桥周全法
Owner JIANGSU UNIV OF TECH