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A kind of nonaqueous electrolytic solution for lithium ion battery and lithium ion battery using the nonaqueous electrolytic solution

A lithium-ion battery and non-aqueous electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as battery performance damage, synergistic effects, and increased side reactions, so as to reduce corrosion, improve cycle life and capacity retention, and inhibit metal Dissolution effect

Active Publication Date: 2020-09-18
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of additives will inevitably introduce more influencing factors, and the synergy and side reactions between them will also increase, which may cause damage to other performances of the battery, etc.

Method used

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  • A kind of nonaqueous electrolytic solution for lithium ion battery and lithium ion battery using the nonaqueous electrolytic solution
  • A kind of nonaqueous electrolytic solution for lithium ion battery and lithium ion battery using the nonaqueous electrolytic solution
  • A kind of nonaqueous electrolytic solution for lithium ion battery and lithium ion battery using the nonaqueous electrolytic solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The non-aqueous electrolyte is prepared as follows: in a glove box, ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mixed in a weight ratio of 25 :5:50:20 for mixing, and then adding lithium hexafluorophosphate for dissolution to prepare an electrolyte solution with a lithium hexafluorophosphate concentration of 1M. After that, adding mass fraction to the electrolyte is 0.5% vinylene carbonate, 1% fluoroethylene carbonate (FEC), 1.5% 1,3 propane sultone and 1% lithium difluorophosphate, An additional 0.3% of compound (1) was added.

[0040] Inject the prepared non-aqueous electrolyte for lithium-ion batteries into fully dried 4.35V NCM (nickel: cobalt: manganese = 5:2:3) / graphite soft-pack batteries, and put them on hold at 45°C, high-temperature fixture formation and After the secondary sealing and other procedures, the battery performance test was carried out to obtain the battery used in Example 1.

Embodiment 2

[0042] The preparation method of positive electrode and negative electrode of Example 2 is the same as that of Example 1; the difference is that 0.5% of compound (1) is added to the non-aqueous electrolyte solution in Example 2 during the preparation process.

Embodiment 3

[0044] The preparation method of positive electrode and negative electrode of Example 3 is the same as that of Example 1; the difference is that 1% of compound (1) is added to the non-aqueous electrolyte solution in Example 3 during the preparation process.

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Abstract

The invention discloses a non-aqueous electrolyte for lithium ion battery and a lithium ion battery using the non-aqueous electrolyte. A non-aqueous electrolyte for a lithium ion battery comprises a lithium salt, Organic solvents and additives, the lithium salt may be selected from the group consisting of LiPF 6, one or more of LiBF4, LiClO4, and the like, wherein the organic solvent is selected from one or more of a chain carbonate, a cyclic carbonate, and a carboxylic ester, and may further comprise a pyridyl compound containing a nitrile group represented by the general formula (I), or an oxyheterocyclopyridyl compound containing a nitrile group represented by the general formula (II). The non-aqueous electrolyte for lithium ion batteries can effectively inhibit the dissolution of metals, complexes with HF in the electrolyte, reduces the content of HF, reduces the corrosion of HF on the positive electrode materials, and ultimately improves the cycle life and capacity retention of the batteries.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a nonaqueous electrolytic solution for a lithium ion battery and a lithium ion battery using the nonaqueous electrolytic solution. Background technique [0002] In recent years, the development of lithium-ion batteries has received widespread attention, and it has developed rapidly in the field of mobile phone digital, electric vehicles, electric bicycles, electric tools, and energy storage. Due to the improvement of people's requirements for battery life, batteries with high energy density have become a research hotspot. On the one hand, electrode materials with high energy density, such as high-nickel materials, lithium-rich manganese bases, and silicon-carbon anodes, have attracted a lot of attention; on the other hand, high-voltage lithium-ion batteries are also the main trend of current research. This poses new challenges to battery materials. [0003] First of all, under high vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 杜建委朱学全钟子坊刘津宏
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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