A high-voltage electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte

A technology of lithium ion battery and electrolyte, applied in the field of high voltage electrolyte and lithium ion battery, can solve the problems of poor cycle and low temperature effect, decrease of battery cycle performance, increase of positive electrode impedance, etc., so as to inhibit dissolution and improve conductivity. rate, the effect of suppressing the increase in impedance

Inactive Publication Date: 2019-01-18
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will increase the positive electrode resistance while improving the positive electrode protection ability, which will suddenly reduce the battery cycle performance, and the cycle and low temperature effects will become worse.

Method used

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  • A high-voltage electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte
  • A high-voltage electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte
  • A high-voltage electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte

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Effect test

Embodiment 1

[0041] The high-voltage electrolyte is prepared as follows: in a glove box, ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) are prepared in a weight ratio of 25:5:65. After mixing, 5% mass fraction of the silicide organic solvent (1) is added to the mixed solvent; lithium hexafluorophosphate is added to dissolve, and an electrolyte with a lithium hexafluorophosphate concentration of 1M is prepared. After that, 0.2% of vinylene carbonate (VC), 5% of fluoroethylene carbonate (FEC), and 5% of 1,3 propane sultone (1,3-PS) were added to the electrolyte. ) And 0.5% lithium difluorophosphate (LiPO 2 F 2 ), plus 2% of polynitrile compound (5) and 5% of silyl compound (1).

[0042] Inject the prepared lithium-ion battery with high-voltage electrolyte into the fully dried 4.45V lithium cobalt oxide / graphite soft-pack battery, and after 45℃ shelving, high temperature fixture formation and secondary sealing, the battery performance test , The battery used in E...

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Abstract

A high-voltage electrolyte for a lithium ion battery and a lithium ion battery using the electrolyte are disclosed. The high-voltage electrolyte for the lithium ion battery comprises lithium salt, anorganic solvent and an additive. Wherein the organic solvent comprises one or more of a chain carbonate esters, cyclic carbonate esters, carboxylic esters, silicon-substituted organic solvents, wherein the additive comprises a polynitrile compound, and the preparation method of the lithium ion battery comprises injecting the high-voltage electrolyte for the lithium ion battery into a sufficientlydried lithium cobalt oxide/graphite soft-clad battery of 4.45 V, carrying out the steps of shelving at 45 DEG C, high-temperature clamping formation and secondary sealing. The high-voltage electrolytefor lithium ion battery of the present invention can effectively inhibit metal dissolution, reduce decomposition gas production of the electrolyte, protect the positive electrode, improve high-temperature cycling performance and high-temperature storage performance of the battery, reduce the increase of impedance, and improve low-temperature performance of the lithium ion battery.

Description

Technical field [0001] The present invention relates to the field of batteries, in particular to a high-voltage electrolyte for lithium ion batteries and a lithium ion battery using the electrolyte. Background technique [0002] In recent years, the development of lithium-ion batteries has received widespread attention, and it has developed rapidly in the fields of mobile phones, electric vehicles, electric bicycles, power tools, and energy storage. Due to the increasing requirements for endurance, batteries with high energy density have become a research focus. On the one hand, electrode materials with high energy density, such as high nickel materials, lithium-rich manganese-based, silicon-carbon anode and other electrode materials have attracted a lot of attention; on the other hand, high-voltage lithium-ion batteries are also the main trend of current research. New challenges are presented to battery materials. [0003] Under high voltage conditions, metal ions in a high oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M10/0567
CPCH01M10/0525H01M10/0566H01M10/0567Y02E60/10
Inventor 杜建委朱学全郭力
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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