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Lithium battery electrolyte and lithium ion battery

An electrolyte and lithium battery technology, which is applied in the field of lithium-ion battery materials, can solve the problems of insufficient PPS improvement effect and inability to effectively improve low-temperature performance, so as to improve high-temperature storage and high-temperature cycle performance, improve wettability, and improve low-temperature discharge capacity Effect

Active Publication Date: 2020-04-10
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent CN 106099183 uses propane sulfonate pyridinium salt (PPS) instead of PS to ensure the cycle performance and high temperature performance of the battery, but it cannot effectively improve its low temperature performance, and the experiment proves that the improvement effect of PPS on high temperature is not as good as that of PS

Method used

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  • Lithium battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of lithium battery electrolyte

[0025] The preparation of electrolyte in the embodiment is carried out in the argon gas glove box, and moisture and oxygen content are all controlled below 0.5ppm in the glove box, to ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, ethyl acetate Add mass The ratio is respectively 3% of fluoroethylene carbonate, 0.5% of propanesulfonate pyridinium salt and 0.1% of dopamine to prepare lithium battery electrolyte. After testing, the water in the electrolyte is <20ppm, and the free acid is <50PPM.

[0026] 2. Preparation of positive and negative electrodes

[0027] Preparation of high-nickel pole piece: Mix high-nickel positive electrode active material (NCM811), conductive carbon black Super-P and PVDF binder according to the mass ratio of 90:6:4, add appropriate amount of NMP to adjust viscosity, and mix all components evenly A slurry is prepared. Then the slurry is evenly coated on th...

Embodiment 2

[0032] Lithium-ion battery was prepared according to the method of Example 1, except that the organic solvent in the electrolyte used was ethylene carbonate, propylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate (EC:PC:DEC :EMC:DMC:EP=15:5:10:35:30:5).

Embodiment 3

[0034] Lithium-ion batteries were prepared according to the method of Example 1, except that the organic solvent in the electrolyte used was ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate (EC:PC:DEC:EMC=15: 5:10:70).

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Abstract

The invention relates to the technical field of lithium ion battery materials, in particular to a lithium battery electrolyte and a lithium ion battery. The lithium battery electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises fluoroethylene carbonate and one or more than two selected from pyridinium propanesulfonate, dopamine, lithium oxalyldifluoroborate and lithium difluorophosphate. According to the electrolyte disclosed by the invention, the pyridinium propanesulfonate, the dopamine, the lithium oxalyldifluoroborate and the lithium difluorophosphate take a synergistic effect to replace traditional propane sultone, so that the low-temperature discharge capacity is greatly improved while the high-temperature storage and high-temperaturecycle performance of the battery is improved, and harmful substances are not generated; meanwhile, ethyl acetate is adopted to improve the wettability of the electrolyte to an electrode material anda diaphragm under a low-temperature condition.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a lithium battery electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products and electric vehicles, and have been extended to electric vehicles, energy storage, and military industries. However, the application and promotion of lithium-ion batteries still face the constraints of specific energy and use environment, and the shackles of the combination of the two to lithium-ion battery technology have now become a technical shortcoming. [0003] Improving the specific capacity of positive and negative electrode materials is an important means to increase the specific energy of lithium-ion batteries. Among them, the application of high-capacity silicon-based negative electrodes and high-nickel ternary positive electrode materials has become increasingly common. However, the silico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 常增花王建涛李翔吴帅锦邵泽超庞静
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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