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Lithium ion battery, non-aqueous lithium ion battery electrolyte and application of fluoro sulfonic anhydride in preparation of non-aqueous lithium ion battery electrolyte

A lithium-ion battery and fluorosulfonic anhydride technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of battery capacity reduction, electrolyte consumption, lithium analysis, etc.

Inactive Publication Date: 2017-09-08
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In a low-temperature environment, if the formed SEI film is too thick and the film resistance is high, lithium ions cannot migrate through, and lithium precipitation will occur; during high-temperature cycling, if the formed SEI film is not dense and stable, the SEI film will Gradually dissolve or rupture, causing the exposed negative electrode to continue to react with the electrolyte, which consumes the electrolyte and reduces the battery capacity

Method used

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  • Lithium ion battery, non-aqueous lithium ion battery electrolyte and application of fluoro sulfonic anhydride in preparation of non-aqueous lithium ion battery electrolyte
  • Lithium ion battery, non-aqueous lithium ion battery electrolyte and application of fluoro sulfonic anhydride in preparation of non-aqueous lithium ion battery electrolyte
  • Lithium ion battery, non-aqueous lithium ion battery electrolyte and application of fluoro sulfonic anhydride in preparation of non-aqueous lithium ion battery electrolyte

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specific Embodiment approach

[0023] The invention provides a functional additive for electrolyte that can improve the first charge and discharge efficiency of the battery, improve the normal temperature cycle performance, high temperature cycle performance, high temperature storage performance, and low temperature cycle performance of the battery, and also provides a non-aqueous lithium battery containing the functional additive An electrolyte solution for an ion battery and a lithium ion battery containing the electrolyte solution.

[0024] The non-aqueous lithium-ion battery electrolyte functional additive uses fluorosulfonic anhydride as the functional additive.

[0025] The fluorosulfonic anhydride in the present invention is a combination of one or more homologous compounds in the fluorosulfonic anhydride compounds.

[0026] The fluorosulfonic anhydride may include at least one of fluoromethanesulfonic anhydride, difluoromethanesulfonic anhydride, trifluoroethanesulfonic anhydride, and fluorosulfonic...

Embodiment 1

[0042] 1. Electrolyte preparation: The electrolyte is prepared in a BRAUN glove box filled with nitrogen gas with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is room temperature. Mix the solvent system with a mass ratio of EC:DMC:DEC=3:3:4 evenly, seal it, put it in the refrigerator until it is cooled to 8°C, transfer it to the glove box, and then add LiPF in two batches 6 Fully mix, form the lithium salt molar concentration and be the non-aqueous electrolytic solution of the lithium ion battery of 1mol / L, add trifluoromethanesulfonic anhydride in above nonaqueous electrolytic solution and make it obtain containing 0.2% trifluoromethanesulfonic anhydride The non-aqueous electrolyte solution is uniformly mixed to obtain the non-aqueous lithium-ion battery electrolyte solution.

[0043] 2. Preparation of lithium-ion battery positive electrode: Mix nickel-cobalt-aluminum ternary material NCA, conductive agent SuperP, and adhesive...

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Abstract

The invention discloses a lithium ion battery, a non-aqueous lithium ion battery electrolyte and application of fluoro sulfonic anhydride in preparation of the non-aqueous lithium ion battery electrolyte. The lithium ion battery comprises a positive electrode, a negative electrode, a separator and the non-aqueous lithium ion battery electrolyte, wherein the non-aqueous lithium ion battery electrolyte comprises a non-aqueous organic solvent, an electrolyte salt and fluoro sulfonic anhydride, where the fluoro sulfonic anhydride is used as a functional additive, such as trifluoromethyl sulfonic anhydride, pentafluoroethyl sulfonic anhydride and perfluorobutyl sulfonic anhydride. The fluoro sulfonic anhydride is introduced as the functional additive and is applied to the non-aqueous lithium ion battery electrolyte and the battery, a compact and uniform SEI membrane with high lithium ion conductivity can be formed during initial formation of the battery prepared from the non-aqueous lithium ion battery electrolyte, so that the current distribution during charge-discharge period of the battery is uniform, the ion conductivity of lithium ions is improved, and the normal-temperature cycle property, the high-temperature cycle property, the high-temperature storage performance and the low-temperature cycle property of the lithium ion battery are further improved.

Description

[0001] [technical field] [0002] The invention relates to lithium batteries, in particular to the application of lithium ion batteries, nonaqueous lithium ion battery electrolytes and fluorosulfonic anhydrides in preparing nonaqueous lithium ion battery electrolytes. [0003] [Background technique] [0004] With the pursuit of small volume and high energy density of the battery, the compaction density of the positive and negative electrodes is continuously increased or the high-capacity negative electrode material with poor cycle performance is used, which also brings a series of performance problems of the battery, such as poor cycle performance, Poor high-temperature performance, poor low-temperature performance and rate performance, easy to precipitate lithium during low-temperature charge and discharge. The cause analysis of the above problems found that a layer of SEI film will be formed on the surface of the negative electrode during the first charging process of the lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 王霹霹戴晓兵毛冲赵苗苗
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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