Electrolyte raw material composition, electrolyte, lithium ion secondary battery and preparation method thereof

A lithium-ion battery and raw material composition technology, applied in the direction of secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., to achieve the effects of ensuring cycle performance, ensuring rate performance, and improving safety

Active Publication Date: 2020-07-17
FARASIS TECH (GANZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the gel polymer electrolyte has been commercially produced, but it is still a major problem facing the gel polymer electrolyte to integrate excellent mechanical properties and electrical properties.

Method used

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  • Electrolyte raw material composition, electrolyte, lithium ion secondary battery and preparation method thereof
  • Electrolyte raw material composition, electrolyte, lithium ion secondary battery and preparation method thereof
  • Electrolyte raw material composition, electrolyte, lithium ion secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0036] According to a preferred embodiment of the present invention, the acrylate is any one or more of the compounds shown in the following formula 1) and formula 2):

[0037]

[0038] Wherein, R in formula I) and formula II) 1 ~R 2 The number of carbon atoms contained in each is 0-3, preferably each is H, CH 3 、C 2 h 5 、C 3 h 7 、C 4 h 9 、C 6 h 5 、CF 3 、CF 3 CH 2 、CF 2 HCH 2 、CF 3 CF 2 、CF 2 HCF 2 CH 2 , OCH 2 CF 3 , any of the. Using the aforementioned preferred acrylate can improve the safety and durability of the electrolyte used in lithium-ion batteries.

[0039] According to a preferred embodiment of the present invention, the preferred acrylate is one or more of.

[0040] In the present invention, the non-aqueous organic solvent can be selected in a wide range, and the selection of the solvent should be reasonably matched to ensure that the electrolyte solution has a relatively low viscosity and relatively high electrical conductivity. C...

Embodiment 1

[0091] (1) Preparation of positive electrode sheet for lithium ion battery

[0092] The positive electrode active material nickel cobalt manganese lithium (LiNi 0.5 co 0.2 mn 0.3 o 2 ), the conductive agent super-P, and the binder PVDF are dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96:2:2 and mixed evenly to process the positive electrode slurry, and then the positive electrode slurry is evenly coated on the current collector aluminum foil, Coating amount 0.040g / cm 2 , followed by drying at 120°C, cold pressing, cutting, slitting, and punching, and then drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a positive electrode sheet of a lithium-ion battery that meets the requirements.

[0093] (2) Preparation of lithium-ion battery negative electrode sheet

[0094] Negative electrode active material artificial graphite, conductive agent super-P, thickener CMC, and binder SBR are dissolved in deionized water at a mass ratio ...

Embodiment 2-14

[0101] Examples 2 to 14 are used to illustrate the lithium-ion battery electrolyte, lithium-ion battery and preparation method thereof disclosed in the present invention, including most of the operating steps in Example 1. Except for the parameters in Table 1 below, other parameters are the same as in Example 1 unanimous.

[0102] Table 1

[0103]

[0104]

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PUM

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Abstract

The invention provides a gel electrolyte raw material composition for a lithium ion battery. The composition comprises a non-aqueous organic solvent, an electrolyte lithium salt, an additive inorganicacid organic ester and/or nitrile and acrylate. The invention provides a gel electrolyte for the lithium ion battery. The electrolyte is obtained by mixing the composition provided by the invention with a thermal initiator and then carrying ouit polymerizing. The invention provides the lithium ion secondary battery and a preparation method thereof; and the battery comprises a pole core and an electrolyte, wherein the pole core and the electrolyte are sealed in a battery housing, the pole core comprises a positive plate, a negative plate and a diaphragm, and the electrolyte is the electrolyteprovided by the invention. The gel electrolyte provided by the invention can greatly improve the safety and durability of the lithium ion battery.

Description

technical field [0001] The invention relates to a gel electrolyte raw material composition for a lithium ion secondary battery, a gel electrolyte for a lithium ion secondary battery, a lithium ion secondary battery and a preparation method thereof. Background technique [0002] The safety issue of power batteries is generally called "thermal runaway", that is, after reaching a certain temperature, it becomes uncontrollable, the temperature rises linearly, and then combustion and explosion will occur. The essence of new energy vehicle safety accidents is battery thermal runaway. The causes of thermal runaway include mechanical and electrical causes (battery collision extrusion, acupuncture, etc.) short circuit, etc.). When thermal runaway occurs in one battery cell, thermal runaway occurs one after another after the adjacent cells are affected, leading to the spread of thermal runaway and eventually causing safety accidents. [0003] The electrolytes used in lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0565H01M10/0567
CPCH01M10/0525H01M10/0567H01M10/0565H01M2300/0025H01M2300/0085Y02E60/10
Inventor 廖帅玲陈虎熊得军吕家斌P·廖
Owner FARASIS TECH (GANZHOU) CO LTD
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