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Nonaqueous electrolyte for high-voltage lithium ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of reduced cycle performance, difficult to guarantee cycle performance, poor electrolyte compatibility, etc., to improve wettability, Improve the effect of normal temperature and high and low temperature cycle performance

Active Publication Date: 2015-04-08
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of increasing the charging cut-off voltage is limited. Further improvement will lead to excessive delithiation of lithium cobalt oxide, and the stability of the structure will be reduced.
The other is to use higher-capacity materials, such as silicon or some alloy materials, but at present, these materials have very poor compatibility with the electrolyte, and the cycle performance is difficult to guarantee
[0003] However, with the increase of operating voltage and charge cut-off voltage, the oxidation activity of the positive electrode material increases, and the reaction between the positive electrode active material and the electrolyte also accelerates, resulting in severe gas swelling of the battery under high voltage and a decrease in cycle performance, which seriously restricts the battery life. The performance of positive electrode materials

Method used

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  • Nonaqueous electrolyte for high-voltage lithium ion battery
  • Nonaqueous electrolyte for high-voltage lithium ion battery
  • Nonaqueous electrolyte for high-voltage lithium ion battery

Examples

Experimental program
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Embodiment 1

[0031] The electrolyte was prepared in a BRAUN glove box filled with nitrogen with a purity of 99.999%, the moisture in the glove box was controlled at ≤5ppm, and the temperature was at room temperature. Mix 30 grams of EC and 70 grams of EMC, mix well, seal, put it in the refrigerator and let it cool down to 8°C, transfer it to the glove box, and then add LiPF in two batches 6 Mix well to form a non-aqueous electrolyte for lithium ion batteries with a lithium salt molar concentration of 1 mol / L, add 3% FEC, 2% LIFSI, 3% propane sultone in the above non-aqueous electrolyte, 2% of 1,2,3-tricarbonitrile 1.5 is uniformly mixed to obtain a high-voltage lithium ion non-aqueous electrolyte.

[0032] The preparation methods of the following other examples and comparative examples are carried out with reference to the preparation method of Example 1.

[0033]Among them, FEC (CAS: 114435-02-8), 1,3,5 pentanetricarbonitrile (4379-04-8), 1,2,3 glycerol (62872-44-0), 1,3,6 Hexane trinit...

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Abstract

The invention discloses nonaqueous electrolyte for a high-voltage lithium ion battery. The nonaqueous electrolyte consists of a solvent, an inorganic lithium salt, a fluoro-ester additive, a sultone additive, an organic tri-nitrile additive, a bi(polyfluoroalkoxy sulfonyl) imine lithium salt and a lithium battery electrolyte additive, wherein the addition amount of the solvent is 100 weight parts; the addition amount of the fluoro-carbonate additive is 0.2-10 weight parts; the addition amount of the nitrile additive is 0.2-10 weight parts; the addition amount of the bi(polyfluoroalkoxy sulfonyl) imine lithium salt is 0.2-10 weight parts; the addition amount of the common lithium battery electrolyte additive is 0-10 weight parts; the solvent refers to cyclic carbonate and / or chain carbonate; and the molar concentration of the inorganic lithium salt in the solvent is 0.8-1.5mol / L. According to combined use of the sultone additive, the fluoro-ester carbonate additive, the bi(polyfluoroalkoxy sulfonyl) imine lithium salt and the organic tri-nitrile additive, the oxidation resistance of the SEI film during primary formation of the electrolyte can be improved, and the normal-temperature and high-temperature cycle performance of the high-voltage electrolyte is obviously improved.

Description

[Technical field] [0001] The invention relates to an electrolyte for lithium ion batteries, in particular to a non-aqueous electrolyte for high voltage lithium ion batteries. [Background technique] [0002] Lithium-ion battery cathode materials currently used, such as LiCo0 2 , LiMn 2 O 4 ,LiCoNiMnO 2 ,LiFePO 4 When the working voltage is lower than 4V, the gram capacity is 90-150mg / g. There are two main ways to improve the energy density of batteries. One is to increase the charge cut-off voltage of traditional cathode materials. For example, by increasing the charging voltage of lithium cobalt oxide to 4.35V or 4.4V, the capacity of the battery can be increased by about 15%. However, the method of increasing the charge cut-off voltage is limited, and further improvement will lead to excessive delithiation of lithium cobalt oxide, reducing the stability of the structure. The other is to use materials with higher capacity, such as silicon or some alloy materials, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567H01M10/4235Y02E60/10
Inventor 王霹霹陈性宝戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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