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Composite lithium ion battery electrolyte and lithium ion battery comprising same

A technology of lithium-ion batteries and electrolytes, applied in electrolytes, secondary batteries, organic electrolytes, etc., can solve the problems of reduced initial charge and discharge capacity, improve cycle performance, improve high-temperature storage and cycle performance, and increase high-voltage capacity and the effect of cycle life

Active Publication Date: 2019-02-19
산산어드밴스드머테리얼스(취저우)컴퍼니리미티드
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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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  • Composite lithium ion battery electrolyte and lithium ion battery comprising same
  • Composite lithium ion battery electrolyte and lithium ion battery comprising same
  • Composite lithium ion battery electrolyte and lithium ion battery comprising 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 a moisture content of less than 10 ppm, EC, DEC, and EMC were mixed uniformly in a mass ratio of 30:25:45, and then slowly added LiPF accounting for 14wt% of the total electrolyte 6 Lithium salt, finally, adding 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. Using the electrolyte of this example 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 a moisture content of less than 10 ppm, EC, DEC, and EMC were mixed uniformly in a mass ratio of 30:25:45, and then slowly added LiPF accounting for 14wt% of the total electrolyte 6 Lithium salt, finally, adding 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. Using the electrolyte of this example 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 in this embodiment is the same as that in Example 1. The electrolyte is composed of an organic solvent, lithium salt, 2-propargyl methyl carbonate, DTD, and LiFSI. The organic solvent is composed of EC, DEC, and EMC, and the mass ratio of EC, DEC, and EMC is 30:25:45, and the lithium salt is LiPF 6 , accounted for 14wt% of the total electrolyte, 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 %. Using the electrolyte of this example 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 present invention relates to the field of batteries, and in particular to a composite lithium-ion battery electrolyte and a lithium-ion battery containing the electrolyte. Background technique [0002] Currently, commercial lithium-ion battery electrolytes usually contain a variety of additives, such as common solid electrolyte interface film (SEI) film-forming additives, overcharge prevention additives, and flame retardant additives. Among them, SEI film-forming additives are the most studied additives, and vinylene carbonate (VC) is a common SEI film-forming additive. In lithium-ion batteries, VC will undergo a 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. However, VC will also undergo an oxidation reaction on the surface of the positive electrode, which is harmful to lithium ions. This ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 毛海良大浦靖郭力
Owner 산산어드밴스드머테리얼스(취저우)컴퍼니리미티드
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