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In-situ curing electrolyte, gel lithium ion battery and preparation method thereof

An in-situ curing, electrolyte technology, applied in the field of electrolyte, can solve problems such as poor chemical properties, and achieve the effect of simple operation and good market prospects

Pending Publication Date: 2021-12-21
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an in-situ solidified electrolyte, a gel lithium ion battery and a preparation method thereof in order to overcome the generally poor electrochemical performance of the gel lithium ion battery in the prior art

Method used

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  • In-situ curing electrolyte, gel lithium ion battery and preparation method thereof
  • In-situ curing electrolyte, gel lithium ion battery and preparation method thereof
  • In-situ curing electrolyte, gel lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] (1) In-situ curing electrolyte configuration: mix 300g of EC, 600g of EMC, and 100g of DEC in a glove box with a water content of less than 1ppm and an oxygen content of less than 2ppm, and then add 150g of LiPF 6 The basic electrolyte was obtained; 25g NCS-1 and 30g PVA-CN-1 (Mw=3000) were added to the basic electrolyte to obtain in-situ solidified electrolyte E1; wherein, the composition of E1 was shown in Table 1.

[0056] (2) Assembly and production of dry cells: mix the positive electrode material Ni83, carbon black, CNT, and PVDF in a ratio of 100:0.6:0.6:1.5, coat them on a 12 μm aluminum foil, and then dry them at 85°C; Graphite, carbon black, SBR, and CMC were evenly mixed and coated on an 8μm copper foil in a ratio of 100:0.9:1.9:1.5, and then dried at 90°C; using a ceramic diaphragm as a diaphragm, the positive and negative electrodes were rolled The winding form is made into a dry cell.

[0057] (3) Formation, aging and capacity separation process: Inject t...

Embodiment 2-17

[0059] Prepare in-situ solidified electrolyte E2-E17 and gel lithium-ion battery C2-C17 according to the method described in Example 1, the difference is that the solvent and lithium salt and the addition amount are kept constant, and the electropolymerization monomer and crosslinking agent are changed , the compositions of the obtained in-situ solidified electrolytes E2-E17 are shown in Table 1.

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Abstract

The invention relates to the technical field of electrolyte, and discloses in-situ curing electrolyte, a gel lithium ion battery and a preparation method thereof. The in-situ curing electrolyte comprises 100 parts by weight of a solvent, 0.2-1.2 parts by weight of a lithium salt based on the mass of a lithium element, 2-10 parts by weight of an electro-polymerization monomer and 1-10 parts by weight of a cross-linking agent, wherein the electro-polymerization monomer is a compound containing phosphorus atoms, sulfur atoms and isothiocyano groups, and the cross-linking agent is a polyvinyl alcohol derivative containing cyano groups. According to the electrolyte provided by the invention, an initiator does not need to be added, the problem of performance reduction caused by residues of the initiator and monomers does not exist, and the prepared gel lithium ion battery not only is good in safety performance, but also is excellent in cycle and storage performance, and has a good market prospect.

Description

technical field [0001] The invention relates to the technical field of electrolytes, in particular to an in-situ solidified electrolyte, a gel lithium ion battery and a preparation method thereof. Background technique [0002] At present, the lithium-ion battery industry is pursuing higher energy density of lithium batteries, which is also an important indicator reflecting battery technology. However, the increase in the energy density of lithium batteries can easily lead to a significant decrease in the safety performance of lithium-ion batteries, so power battery fires often occur. [0003] In order to improve the safety of batteries, more and more attention has been paid to the research of battery thermal runaway. At present, at the level of lithium-ion battery combination technology, fireproof materials and BMS system design have improved the safety of battery packs a lot, but these have not improved the intrinsic safety of batteries, and the symptoms are not cured. Whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 钟海敏赵文文时迎华
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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