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High-voltage electrolyte adaptive to rapidly-chargeable lithium cobalt oxide battery and application of high-voltage electrolyte

An electrolyte and high-voltage technology, applied in the field of lithium-ion batteries, to achieve good cycle performance, prevent local film thickness, and improve cycle stability

Active Publication Date: 2022-01-04
新乡华锐锂电新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is still lacking to develop an effective method that can easily and simultaneously construct a stable and fast lithium ion transport interface protective layer on the negative and positive electrodes.

Method used

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  • High-voltage electrolyte adaptive to rapidly-chargeable lithium cobalt oxide battery and application of high-voltage electrolyte
  • High-voltage electrolyte adaptive to rapidly-chargeable lithium cobalt oxide battery and application of high-voltage electrolyte

Examples

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Effect test

Embodiment 1

[0022] In an argon-filled glove box (moisture 4 ) and bis(trimethylsilyl)lithium phosphate (LiPO) based on 7.2% of the total mass of the electrolyte 4 (Si(CH 3 ) 3 ) 2 ), and stirred until it was completely dissolved to obtain the lithium-ion battery electrolyte of Example 1.

[0023] Inject the prepared electrolyte into the positive electrode LiCoO 2 Materials, in the pouch battery with graphite material as the negative electrode, the battery is packaged, placed on hold at 45°C, high-temperature formation, secondary packaging, and capacity separation to obtain a high-voltage lithium cobaltate lithium-ion battery.

[0024] As shown in Table 1, in Examples 2-5 and Comparative Examples 1-7, except that the components and proportions of the electrolyte solution are added as shown in Table 1, the others are the same as in Example 1.

[0025] Table 1 Composition and proportioning of the electrolyte solutions of Examples 1-5 and Comparative Examples 1-7

[0026]

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Abstract

The invention discloses a high-voltage electrolyte adaptive to a rapidly-chargeable lithium cobalt oxide battery. The high-voltage electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, and the additive comprises methyl 2-thienyl cyano carbon o dithioimino ester and methyl (difluorophosphoryl) methyl carbamate. The additive forms a layer of uniform and compact protective film with high ionic conductivity on the surface of the LiCoO2 material, so that dissolution of metal ions in a positive electrode material and collapse of the material structure are inhibited. A stable low-impedance SEI film in a partial inorganic form is formed on a negative electrode graphite interface, free migration and reduction of metal ions in the electrolyte can be inhibited, damage to the surface of the electrode is reduced; and through the synergistic effect of all the components in the electrolyte, the LiCoO2 positive electrode material and the graphite negative electrode lithium ion battery can have good cycle performance, fast charge performance and low-temperature performance under high voltage.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage electrolyte suitable for fast-charging lithium cobalt oxide batteries and its application. Background technique [0002] Li-ion batteries are now an essential power source for portable electronic devices, electric vehicles, power stations or grid applications. However, its large-scale application still faces great challenges in terms of energy density, cycle life, fast charging performance, and operating temperature range. A possible approach to increase battery energy density is to use high-capacity electrode (cathode or anode) materials and high-voltage cathode materials. Lithium cobalt oxide (LiCoO 2 ) as the earliest commercial positive electrode material has the advantages of high voltage platform and high compaction density, but the capacity of conventional lithium cobalt oxide materials is only 140mAh / g, which is about 50% of its theoretical ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M2300/0025Y02E60/10
Inventor 郭慧芳李娟程树国管利娜孟小平崔文举闫晓宾周亚辉张俊孝王福芳王小华
Owner 新乡华锐锂电新能源股份有限公司
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