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Electrolyte for lithium ion battery and lithium ion battery comprising same

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of non-aqueous electrolyte batteries, electrolyte batteries, electrolytes, etc., can solve problems such as lithium analysis, achieve the effects of easy insertion and extraction, optimization of preparation process, and guaranteed thickness and compaction density

Pending Publication Date: 2021-04-02
ZHANGZHOU HUARUI PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of electrolyte for lithium-ion battery and the lithium-ion battery comprising it

Method used

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  • Electrolyte for lithium ion battery and lithium ion battery comprising same
  • Electrolyte for lithium ion battery and lithium ion battery comprising same
  • Electrolyte for lithium ion battery and lithium ion battery comprising same

Examples

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Embodiment 1

[0027] A lithium ion battery, comprising a positive electrode sheet, a negative electrode sheet and a diaphragm, the diaphragm is located between the positive electrode sheet and the negative electrode sheet, the lithium ion battery is filled with electrolyte, the composition of the electrolyte is shown in Table 1, during preparation The raw materials are weighed according to the weight percentage and then mixed, and the stirring is evenly priced.

[0028] The preparation method of the positive electrode sheet is: mix and stir the positive electrode active material, conductive agent, and binder according to the mass ratio of 94:2:4, and then coat it on the aluminum foil with a coating thickness of 200g / m 2 , after rolling and slitting, welding the tabs to make the positive electrode sheet, the compaction density of the electrode sheet is 3.0g / cm 3 . Among them, the positive electrode active material is lithium manganese oxide, lithium cobalt oxide, and nickel cobalt lithium m...

Embodiment 2-5

[0035] To prepare a lithium-ion battery, see Table 1 for the amount of each raw material in the electrolyte, and the rest of the preparation method is the same as in Example 1.

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Abstract

The invention relates to an electrolyte for the lithium ion battery and a lithium ion battery comprising same. The electrolyte is prepared from the following components, by weight: 10-18% of lithium hexafluorophosphate, 0.2-2.0% of lithium difluorophosphate, 0.2-1.5% of lithium oxalyldifluoroborate, 5-15% of ethyl propionate, 30-50% of dimethyl carbonate, 10-20% of diethyl carbonate, 15-30% of ethyl methyl carbonate, 0.5-5% of ethylene carbonate and 1.5-5% of fluoroethylene carbonate. The lithium ion battery comprises a positive plate, a negative plate, a diaphragm and the electrolyte, the positive plate comprises a positive active substance, the positive active substance is at least one of lithium manganate, lithium cobalt oxide and nickel cobalt lithium manganate, and the particle size of the positive active substance is 6-11 microns. The battery is free of lithium precipitation during charging at -30 DEG C, has good low-temperature performance, can be suitable for -40 DEG C and hasa stable discharge platform.

Description

technical field [0001] The invention relates to the technical field of low-temperature lithium-ion batteries, in particular to an electrolyte for lithium-ion batteries and a lithium-ion battery containing the same. Background technique [0002] When a lithium-ion battery is being charged, lithium ions are deintercalated from the positive electrode and inserted into the negative electrode; but when some abnormal conditions: such as insufficient space for lithium intercalation in the negative electrode, too much resistance for lithium ions to be inserted into the negative electrode, lithium ions are deintercalated from the positive electrode too quickly but cannot wait When abnormalities such as a large amount of insertion into the negative electrode occur, the lithium ions that cannot be inserted into the negative electrode can only obtain electrons on the surface of the negative electrode, thereby forming a silver-white metal lithium element, which is often called "lithium an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/058H01M10/42
CPCH01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/058H01M10/4235H01M2300/0025H01M2300/0091Y02E60/10Y02P70/50
Inventor 杨宪宝李锐辉
Owner ZHANGZHOU HUARUI PHOTOELECTRIC TECH
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