Lithium-ion battery non-aqueous electrolyte and lithium-ion battery thereof

A lithium-ion battery, non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems affecting the battery rate performance and low-temperature use effect, cannot have excellent chemical properties, cannot take into account high and low temperature, etc., so as to improve high-temperature cycle performance, improve Low temperature cycle effect, effect of widening temperature range

Inactive Publication Date: 2020-04-17
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, one of the main problems faced by lithium-ion batteries is that they cannot take into account both high and low temperatures, that is, they cannot have excellent chemical properties at both high and low temperatures.
Under high temperature conditions, because the electrolyte in lithium-ion batteries is easy to catalyze and decompose on the surface of the positive electrode, resulting in battery flatulence and capacity reduction, etc., it is necessary to add a catalyst with excellent positive electrode film-forming properties to complex metal ions and passivate the active sites of the positive electrode. etc.; and the addition of such additives will lead to a significant increase in battery impedance, seriously affecting the rate performance of the battery and the low-temperature use effect

Method used

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  • Lithium-ion battery non-aqueous electrolyte and lithium-ion battery thereof
  • Lithium-ion battery non-aqueous electrolyte and lithium-ion battery thereof
  • Lithium-ion battery non-aqueous electrolyte and lithium-ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The non-aqueous electrolyte is prepared as follows: in a glove box, ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) are mixed in a weight ratio of 30 : 5:20:45 ratio is mixed to obtain a mixed solution, and then lithium hexafluorophosphate (LiPF 6 ) is dissolved to obtain a solution containing lithium hexafluorophosphate. After that, add vinylene carbonate (VC), ethylene sulfate (DTD), lithium difluorophosphate (DFP), compound II and lithium difluorophosphate oxalate shown in structural formula I to the solution containing lithium hexafluorophosphate, and stir evenly to obtain The non-aqueous electrolytic solution of embodiment 1. The concentration of lithium hexafluorophosphate in the electrolyte is 1.15M, the mass percent of vinylene carbonate (VC) in the electrolyte is 0.5%, the mass percent of vinyl sulfate (DTD) in the electrolyte is 1%, and the lithium difluorophosphate The mass percentage of (DFP) in t...

Embodiment 2-32

[0050] Examples 2-32 are also specific examples of electrolyte preparation. Except for the parameters in Table 1, other parameters and preparation methods are the same as in Example 1. The electrolyte formulation is shown in Table 1.

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PUM

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Abstract

The present invention discloses a lithium-ion battery non-aqueous electrolyte which comprises a lithium salt, an organic solvent and an additive. According to the mass percentage content in the lithium-ion battery non-aqueous electrolyte, the additive comprises 0.5-2% of a lithium salt additive, 0.2-1.0% of a high-temperature additive, and 0.2-5% of other additives. The invention also discloses alithium-ion battery. The lithium-ion battery provided by the invention can give consideration to high-temperature and low-temperature performances, and the temperature range of the lithium-ion batteryin use is widened.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a non-aqueous electrolyte solution for high-voltage and wide-temperature lithium-ion batteries and a lithium-ion battery. Background technique [0002] The electrolyte in lithium-ion batteries is the medium connecting the positive and negative electrodes and the transmission medium of lithium ions, which plays an extremely important role. Usually, the main components of the electrolyte include organic solvents, lithium salts and additives. Among them, lithium salts provide lithium ions for internal current transmission; the role of organic solvents is to dissolve lithium salts and produce solvated lithium ions; there are many types of additives, which play a role in improving the stability, cycleability, and safety of lithium-ion batteries. The role of performance. [0003] The SEI film refers to a passivation film that covers the electrode surface when the electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 杨冰杜建委周彤吴杰曹青青
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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