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A kind of electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of easy leakage, explosion, and poor electrochemical performance of liquid electrolyte

Active Publication Date: 2019-09-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As people pay more and more attention to environmental protection, lithium-ion batteries are the main direction of new energy development as energy storage devices. For example, the Chinese patent with publication number CN106684448A discloses a preparation method for high-temperature resistant lithium battery electrolyte. The medium electrolyte has a long service life and good thermal stability, but there are still safety problems that the liquid electrolyte is easy to leak, flammable, and explosive.
[0004] Therefore, people turn their attention to solid-state electrolytes, but all-solid-state electrolytes have low conductivity and poor electrochemical performance at room temperature. Therefore, it is necessary to develop an electrolyte with high safety and good practicability.

Method used

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  • A kind of electrolyte and lithium ion battery
  • A kind of electrolyte and lithium ion battery
  • A kind of electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First remove water from ethylene carbonate (EC) and dimethyl carbonate (DMC) with dry molecular sieves, and let it stand for about 24 hours for later use;

[0045] Dry the silane-modified aluminum oxide at 130°C for more than 12 hours, and set aside;

[0046] Weigh the organic solvent with a volume ratio of EC:DMC=3:7, add lithium hexafluorophosphate, mix well, make the concentration of lithium hexafluorophosphate 1mol / L; then add the above-mentioned dried silane-modified aluminum oxide to make the content 3wt% , to obtain the electrolyte, after the self-extinguishing time experiment test, the burning time of the electrolyte is 26.94s g -1 .

Embodiment 2

[0048] Prepare the electrolyte according to the method of Example 1, the difference is that the content of silane-modified aluminum oxide is 10wt%, and after the self-extinguishing time experiment test, the burning time of the electrolyte is 17.36s g -1 .

Embodiment 3

[0050] The electrolyte was prepared according to the method of Example 1, except that the content of silane-modified aluminum oxide was 15wt%, and the combustion time of the electrolyte was 10.87s g-1 after the self-extinguishing time test.

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Abstract

The invention provides electrolyte which is prepared from 0.5 to 4mol / L inorganic lithium salt, 3 to 15wt% of silane modified inorganic filler and solvent, wherein silane used by the silane modified inorganic filler is YSiX3, the Y is chosen from alkyl, oxo alkyl, amino or phenyl, and the X is chosen from alkyl or alkoxy; inorganic filler used by the silane modified inorganic filler is chosen from one or several of silicate, carbonate, carbide, sulfate, sulfide, titanate, oxide, hydroxide and metal inorganic filler. The electrolyte disclosed by the invention is semi-solid state or quasi-solid state electrolyte. Silane modified aluminum oxide is added into the electrolyte disclosed by the invention to improve viscosity of liquid state electrolyte, reduce solution fluidity and avoid the hidden danger that liquid state solution is prone to leaking; furthermore, battery safety is improved; the electrolyte can bear higher voltage. The invention further provides a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion battery is the rechargeable chemical battery with the best technical performance in the world. It has the advantages of high working voltage, large specific energy, long cycle life, small self-discharge, no memory effect, and no pollution. It is widely used in mobile communications, notebooks, etc. Computers, portable tools, electric bicycles and other fields. [0003] As people pay more and more attention to environmental protection, lithium-ion batteries are the main direction of new energy development as energy storage devices. For example, the Chinese patent with publication number CN106684448A discloses a preparation method for high-temperature resistant lithium battery electrolyte. The medium electrolyte has a long service life and good thermal stability, but there are still s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0562
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 许和伟夏永高刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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