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Non-aqueous electrolyte for high-voltage rapid-charging type lithium ion battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in non-aqueous electrolytes, secondary batteries, organic electrolytes, etc., can solve the problems of reduced cycle performance, restricted performance of positive electrode materials, limited and other problems, to improve oxidation resistance, improve The effect of fast charge cycle at room temperature

Inactive Publication Date: 2016-06-22
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main ways to increase the energy density of batteries. One is to increase the charging cut-off voltage of traditional positive electrode materials. There are limited ways to increase the charge cut-off voltage, and further improvement will lead to poor structural stability of lithium cobalt oxide during excessive delithiation
[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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  • Non-aqueous electrolyte for high-voltage rapid-charging type lithium ion battery
  • Non-aqueous electrolyte for high-voltage rapid-charging type lithium ion battery
  • Non-aqueous electrolyte for high-voltage rapid-charging type lithium ion battery

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Embodiment 1

[0032] 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 evenly, seal it, put it in the refrigerator until it cools 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 solution for lithium-ion batteries with a molar concentration of 1 mol / L commonly used lithium salt. Add 3% FEC, 2% LIFSI, and 3% propane sultone to the above non-aqueous electrolyte solution , 2% adiponitrile 1.5, after uniform mixing, a high-voltage lithium-ion non-aqueous electrolyte is obtained.

[0033] The preparation methods of the following other examples and comparative examples are carried out with reference to the preparation method of Example 1.

[0034] Among them, FEC (CAS: 114435-02-8), 1,3,5 pentanetricarbonitrile (4379-04-8), 1,2,3 propanetricarboni...

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Abstract

The invention discloses a non-aqueous electrolyte for a high-voltage rapid-charging type lithium ion battery. The non-aqueous electrolyte comprises a solvent, a commonly-used lithium salt, a positive electrode film-forming additive, lithium bis(polyfluoroalkyloxysulfonyl) imide, a fluoro-ester additive, an organic nitrile additive and a lithium battery electrolyte additive, wherein the ingredients are as follows in parts by weight: 100 parts of solvent, 0.2-10 parts of positive electrode film-forming additive, 0.2-10 parts of lithium bis(polyfluoroalkyloxysulfonyl) imide, 0.2-10 parts of fluoro-ester additive and 0.2-10 parts of organic nitrile additive; the solvent is cyclic carbonate and / or chain carbonate; and the molar concentration of the commonly-used lithium salt in the solvent is 0.8-1.5mol / L. According to the non-aqueous electrolyte provided by the invention, the oxidation resistance and wettability of the electrolyte, the oxidation resistance of the positive electrode SEI film in initial formation and the stability of the negative electrode SEI film can be improved; and the normal temperature rapid-charging circulation, the high-temperature 45-DEG C rapid-charging circulation and the high-temperature storage of the high-voltage electrolyte can be greatly improved.

Description

[technical field] [0001] The invention relates to an electrolyte solution of a lithium-ion battery, in particular to a non-aqueous electrolyte solution of a high-voltage fast-charging lithium-ion battery. [Background technique] [0002] Currently used cathode materials for lithium-ion batteries, such as LiCoO O , LiMn 2 o 4 ,LiCoNiMnO 2 ,LiFePO 4 The working voltage is lower than 4V, and the gram capacity is 90-150mg / g. There are two main ways to increase the energy density of batteries. One is to increase the charging cut-off voltage of traditional positive electrode materials. There are limited ways to increase the charge cut-off voltage, and further improvement will lead to poor structural stability of lithium cobalt oxide during excessive delithiation. [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 materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567H01M2300/0025Y02E60/10
Inventor 王霹霹戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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