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Lithium ion battery electrolyte capable of reducing moisture content and acidity and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as unusable and ineffective effects

Inactive Publication Date: 2011-06-08
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many methods can achieve the purpose of controlling the moisture or acidity of the electrolyte, the effect is not very obvious.
Also, in some cases, the above method may not work

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In EC:DMC:EMC=1 / 1 / 1 organic solvent mixed system (volume ratio), add 1M LiPF 6 Lithium salt, then add LiF with a mass percentage of 0.01%.

Embodiment 2

[0016] In EC:DMC:EMC=1 / 1 / 1 organic solvent mixed system (volume ratio), add 1M LiPF 6 Lithium salt, then add the Li that mass percent is 0.01% 2 CO 3 .

Embodiment 3

[0018] In EC:DMC:EMC=1 / 1 / 1 organic solvent mixed system (volume ratio), add 1M LiPF 6 Lithium salt, then add the metal lithium powder that mass percent is 0.01%

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PUM

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Abstract

The invention relates to the technical field of lithium ion battery electrolyte, in particular to a lithium ion battery electrolyte capable of reducing moisture content and acidity and a preparation method thereof. The electrolyte contains lithium salt, organic solvent and additive; and alkaline weak-acid lithium salt used for maintaining the acidity of the electrolyte at a lower level is also added in the electrolyte, or lithium elements used for controlling the moisture content of the electrolyte are also added in the electrolyte, wherein the adding quantity of the lithium salt or lithium elements accounts for 0.01 to 1 percent of the electrolyte. By adopting the technical scheme, the alkaline weak-acid lithium salt such as Li2CO3, LiF or the like is added in the lithium ion battery electrolyte for controlling the acidity of the electrolyte at a lower level. The lithium elements are added for controlling the moisture content of the electrolyte by utilizing self-activity. The stability of the electrolyte obtained in the invention can be maintained, and the quality guarantee period of the electrolyte can be prolonged.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium-ion battery electrolyte, in particular to a lithium-ion battery electrolyte capable of reducing moisture and acidity and a preparation method thereof. The electrolyte obtained by the invention can maintain the stability of the electrolyte and prolong the shelf life of the electrolyte . 【Background technique】 [0002] The electrolyte is an important part of the lithium-ion battery, which plays the role of transporting and conducting current between the positive and negative electrodes of the battery. Usually the electrolyte includes: solvent, lithium salt as solute and related additives. Among them, the lithium salt mainly used at present is LiPF 6 , The organic solvents used include EC (ethylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate) and the like. [0003] The two indicators of acidity and moisture in the basic physical and chemical indicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42
CPCY02E60/12Y02E60/10
Inventor 侯涛
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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