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Electrolyte containing aromatic oxime additive as well as preparation method and application of electrolyte

An aromatic oxime and electrolyte technology, which is applied to the application field of aromatic oximes and their derivatives in the preparation of lithium ion battery electrolyte, can solve the problems of aromatic oxime additives, etc., and achieves improvement in rate performance and high-temperature storage performance, The effect of improving stability

Active Publication Date: 2020-06-05
SICHUAN PANOVASIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is almost no research on aromatic oxime additives

Method used

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  • Electrolyte containing aromatic oxime additive as well as preparation method and application of electrolyte
  • Electrolyte containing aromatic oxime additive as well as preparation method and application of electrolyte
  • Electrolyte containing aromatic oxime additive as well as preparation method and application of electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 blank control sample

[0034] Prepare EC and DEC as a mixed solvent in the form of 1:1 (volume ratio), then add lithium hexafluorophosphate to it and configure it into 1mol / L LiPF 6 lithium-ion battery electrolyte.

[0035] The above-mentioned lithium-ion battery electrolyte was used as the basic electrolyte without adding any additives, and it was used as a blank control sample.

[0036] The positive active material used is ternary positive LiNi 0.5 co 0.2 mn 0.3 o 2 , the negative electrode is graphite. Among them, the current collector of the positive electrode material is aluminum foil, and the positive electrode sheet is made of 92wt% LiNi 0.5 co 0.2 mn 0.3 o 2 , 4wt% acetylene black and 4wt% binder PVDF; the current collector of the negative electrode material is copper foil, and the negative electrode is composed of 92wt% graphite, 4wt% acetylene black and 4wt% binder PVDF; the diaphragm is PP diaphragm.

[0037] The above-mentioned positi...

Embodiment 2

[0039] Add 0.5wt%, 1wt%, 3wt%, 5wt% salicylate oxime to the basic electrolyte described in Example 1 to obtain a liquid, and the specific structural formula of salicylate oxime is as follows:

[0040]

[0041] Stir the above liquid in a glove box for 5 hours to mix evenly, and then assemble and test the battery according to Example 1. The rate performance and high-temperature storage performance of the battery are as follows: figure 1 with figure 2 shown.

Embodiment 3

[0043] Add 0.5wt%, 1wt%, 3wt%, 5wt% α-benzaldehyde oxime to the basic electrolyte described in Example 1 to obtain liquid, and the specific structural formula of α-benzaldehyde oxime is as follows:

[0044]

[0045] Stir the above liquid in a glove box for 5 hours to mix evenly, and then assemble and test the battery according to Example 1. The rate performance and high-temperature storage performance of the battery are as follows: figure 1 with figure 2 shown.

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Abstract

The invention discloses an electrolyte containing an aromatic oxime additive and a preparation method and application of electrolyte. The aromatic oxime additive is an aromatic oxime organic compoundand a derivative thereof, and has a benzene ring and a-C = N-OH functional group; or has the benzene ring and the functional group. The preparation method comprises the following steps of dissolving alithium salt in a solvent to prepare a solution with the concentration of 0.5-2 mol / L as a basic electrolyte; using 0.1 wt%-5wt% of aromatic oxime organic compounds and the derivatives thereof as additives to be added into the basic electrolyte, and uniformly mixing to obtain the electrolyte. The electrolyte is used as the electrolyte of a lithium ion battery. The aromatic oxime additive is addedinto the electrolyte of the battery, so that the stability of the SEI film is effectively improved, and the rate capability and the high-temperature storage performance of the battery are obviously improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to the application of aromatic oximes and derivatives thereof in the preparation of lithium-ion battery electrolytes. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high voltage, safety and environmental protection, and are often used in electric vehicles, notebooks, mobile phones and other equipment. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes, etc. The positive electrodes mainly use commercial lithium cobalt oxide, lithium iron phosphate and ternary high-voltage materials, and the negative electrodes mainly use layered graphite. The common system of the electrolyte is 1mol / L LiPF 6 Soluble in EC, EMC and other organic solvents. [0003] At present, lithium batteries are widely used, but their applications are limited in extreme environments and high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 高剑辜琴冯有增王铭谭铁宁
Owner SICHUAN PANOVASIC TECH
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