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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effect of reducing content, protecting performance, improving electrochemical performance and cycle performance

Inactive Publication Date: 2012-01-18
SHANGHAI YAOYU INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a lithium-ion battery electrolyte and use the electrolyte to overcome defects such as the presence of moisture in the existing lithium-ion battery electrolyte, the high free acid affecting battery performance, and the occurrence of side reactions that affect the performance of the lithium-ion battery. Lithium-ion batteries, the electrolyte is added with hexamethyldisilazane to inhibit the hydrolysis and pyrolysis of LiPF6 during the storage of the electrolyte, reduce the content of water and free acid in the electrolyte, and improve the storage stability of the electrolyte properties and thermal stability, while improving the electrochemical performance and cycle performance of lithium-ion batteries

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Electrolyte preparation: Take 80 parts by weight of ethylene carbonate and diethyl carbonate (mass ratio: 1:2) and mix evenly, slowly add 10 parts by weight of 1.0mol / L LiPF6, stir to make Fully dissolve, then add 0.45 parts by weight of hexamethyldisilazane, and fully stir.

[0023] Preparation of battery positive electrode: Dissolve polyvinylidene fluoride in a certain amount of N-methylpyrrolidone solvent to prepare a binder solution, add LiCoO2 and acetylene black powder to achieve uniform mixing, and stir at high speed for 1 to 3 hours to obtain the positive electrode Slurry, the slurry is evenly coated on the aluminum foil current collector with a thickness of 20??m by a pulper, vacuum-dried at 150°C for 1.5 hours, rolled, cut into pieces, and welded on the positive electrode tab. Among them: the mass ratio of LiCoO2, acetylene black and polyvinylidene fluoride is 90:5:5.

[0024] Production of battery negative electrode: Mix artificial graphite, carbon fiber and...

Embodiment 2

[0027] Electrolyte preparation: Take 80 parts by weight of ethylene carbonate and diethyl carbonate (mass ratio: 1:2) and mix evenly, slowly add 10 parts by weight of 1.0mol / L LiPF6, stir to make Fully dissolve, then add 2 parts by weight of hexamethyldisilazane and vinylene carbonate (mass ratio is 1:3, that is, 0.5 parts of hexamethyldisilazane, 1.5 parts of vinylene carbonate), Stir well.

[0028] Preparation of battery positive electrode: Dissolve polyvinylidene fluoride in a certain amount of N-methylpyrrolidone solvent to prepare a binder solution, add LiCoO2 and acetylene black powder to achieve uniform mixing, and stir at high speed for 1 to 3 hours to obtain the positive electrode Slurry, the slurry is evenly coated on the aluminum foil current collector with a thickness of 20??m by a pulper, vacuum-dried at 150°C for 1.5 hours, rolled, cut into pieces, and welded on the positive electrode tab. Among them: the mass ratio of LiCoO2, acetylene black and polyvinylidene ...

Embodiment 3

[0035] Electrolyte preparation: take 55 parts by weight of ethylene carbonate and diethyl carbonate (mass ratio 1:3) and mix evenly, slowly add 10 parts by weight of 1.0mol / L LiPF6, stir to make Fully dissolve, then add 0.4 parts by weight of hexamethyldisilazane and vinylene carbonate (mass ratio is 1:3, that is, 0.1 part of hexamethyldisilazane, 0.3 parts of vinylene carbonate), Stir well.

[0036] Preparation of battery positive electrode: Dissolve polyvinylidene fluoride in a certain amount of N-methylpyrrolidone solvent to prepare a binder solution, add LiCoO2 and acetylene black powder to achieve uniform mixing, and stir at high speed for 1 to 3 hours to obtain the positive electrode Slurry, the slurry is evenly coated on the aluminum foil current collector with a thickness of 20??m by a pulper, vacuum-dried at 150°C for 1.5 hours, rolled, cut into pieces, and welded on the positive electrode tab. Among them: the mass ratio of LiCoO2, acetylene black and polyvinylidene ...

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Abstract

The invention relates to a lithium ion battery electrolyte and a lithium ion battery using the electrolyte. The electrolyte comprises the following ingredients: 10 weight portions of lithium salt, 55-80 weight portions of an organic solvent, and 0.4-2 weight portions of additive, wherein, the lithium salt is LiPF6, the organic solvent comprises ethylene carbonate and diethyl carbonate, and the additive comprises hexamethyldisilazane, preferred, the additive also comprises vinylene carbonate. Compared with the prior art, by adding hexamethyldisilazane, the electrolyte inhibits the hydrolysis and pyrolysis of LiPF6 in the electrolyte storage process, reduces the content of water and free acid in the electrolyte, improves the storage stability and thermal stability of the electrolyte, and improves the electrochemical performance and cycle performance of the lithium ion battery using the electrolyte.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] Electrolyte is an important part of lithium-ion batteries. It is responsible for the transfer of charge between the positive and negative electrodes in the battery. It is crucial to the specific capacity, operating temperature range, cycle efficiency and safety performance of the battery. In lithium-ion secondary batteries, the electrolyte has higher requirements on free acid and water content. This is because the voltage of lithium-ion batteries is 3-4V, and the decomposition voltage of water is less than half of it. If the electrolyte contains more Moisture, decomposed under high-voltage charging and discharging, will cause battery performance to deteriorate, and the free acid in the electrolyte is too high, which will also affect battery performance. For example, hydrofluori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 不公告发明人
Owner SHANGHAI YAOYU INDAL
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