A kind of composite lithium-ion battery electrolyte and lithium-ion battery comprising the same

A lithium-ion battery and electrolyte technology, applied in electrolytes, secondary batteries, organic electrolytes, etc., can solve the problem of first charge and discharge capacity reduction, improve cycle performance, improve compatibility, and avoid side reactions

Active Publication Date: 2020-11-06
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent CN 107658498A discloses that the normal temperature circulation of the electrolyte can be improved by adding 2-propynyl methyl carbonate and lithium difluorooxalate phosphate, lithium tetrafluorooxalate phosphate, vinyl sulfate, and 1-propyl phosphoric acid cyclic anhydride. Performance, high temperature storage performance and low temperature discharge performance, but the first charge and discharge capacity of the battery system added with lithium difluorooxalate phosphate and lithium tetrafluorooxalate phosphate electrolyte is significantly reduced

Method used

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  • A kind of composite lithium-ion battery electrolyte and lithium-ion battery comprising the same
  • A kind of composite lithium-ion battery electrolyte and lithium-ion battery comprising the same
  • A kind of composite lithium-ion battery electrolyte and lithium-ion battery comprising the same

Examples

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Embodiment 1

[0034] A composite lithium-ion battery electrolyte is composed of organic solvent, lithium salt, 2-propargyl methyl carbonate, DTD and LiFSI. In an argon glove box with moisture less than 10ppm, mix EC, DEC, and EMC uniformly in a mass ratio of 30:25:45, and then slowly add LiPF which accounts for 14wt% of the total electrolyte 6 Lithium salt, finally, add 2-propargyl methyl carbonate accounting for 0.2 wt% of the total electrolyte, DTD accounting for 0.5 wt% of the total electrolyte, and LiFSI accounting for 0.1 wt% of the total electrolyte. The electrolyte solution of this embodiment is used for LiNi 0.5 co 0.2 mn 0.3 o 2 / Graphite pouch battery (NCM523).

Embodiment 2

[0036] A composite lithium-ion battery electrolyte is composed of organic solvent, lithium salt, 2-propargyl methyl carbonate, DTD and LiFSI. In an argon glove box with moisture less than 10ppm, mix EC, DEC, and EMC uniformly in a mass ratio of 30:25:45, and then slowly add LiPF which accounts for 14wt% of the total electrolyte 6 Lithium salt, finally, add 2-propargyl methyl carbonate accounting for 0.2 wt% of the total electrolyte, DTD accounting for 0.5 wt% of the total electrolyte, and LiFSI accounting for 0.1 wt% of the total electrolyte. The electrolyte solution of this embodiment is used for LiNi 0.6 co 0.2 mn 0.2 o 2 / Graphite pouch battery (NCM622).

Embodiment 3

[0038] The preparation process of the electrolyte solution in this implementation is the same as in Example 1. The electrolyte is composed of organic solvent, lithium salt, 2-propargyl methyl carbonate, DTD, and LiFSI. Organic solvent is made up of EC, DEC, EMC, and the mass ratio of EC, DEC, EMC is 30:25:45, and described lithium salt is LiPF 6 , accounting for 14wt% of the total electrolyte, the additive 2-propargyl methyl carbonate accounted for 0.2wt% of the total electrolyte, DTD accounted for 0.5wt% of the total electrolyte, LiFSI accounted for 0.1wt% of the total electrolyte %. The electrolyte solution of this embodiment is used for LiNi 0.8 co 0.1 mn 0.1 o 2 / Graphite pouch battery (NCM811).

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Abstract

The invention discloses composite lithium ion battery electrolyte and a lithium ion battery comprising the same. The composite lithium ion battery electrolyte comprises an organic solvent, lithium salt and an additive. The organic solvent is at least two of propylene carbonate (PC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), allyl ethyl carbonate (AEC), allylmethyl carbonate (AMC) and the like; and the additive is selected from at least two of unsaturated carbonate, sulfur-containing organic matters, lithium borate dioxalate, lithium difluorophosphate and fluoro-imide salt. For the respective physical and chemical characteristics of the organic solvent and the additive, the types of the additive are screened and combined, by adjustment on an electrolyte additive, the ratio by which respective advantages can be played and respective shortcomings can also be suppressed is found out, the high-voltage capacity of the battery is improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a composite lithium-ion battery electrolyte and a lithium-ion battery containing the electrolyte. Background technique [0002] At present, commercial lithium-ion battery electrolytes usually contain a variety of additives, such as common solid electrolyte interfacial film (SEI) film-forming additives, anti-overcharge additives, and flame retardant additives. Among them, the SEI film-forming additive is an additive that has been studied more, and vinylene carbonate (VC) is a common SEI film-forming additive. In lithium-ion batteries, VC will undergo polymerization reaction on the surface of the negative electrode to form a dense SEI film, thereby preventing further reduction and decomposition of the electrolyte on the surface of the negative electrode, but VC will also undergo oxidation reaction on the surface of the positive electrode at the same time. The performance of the battery is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 毛海良大浦靖郭力
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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