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Electrolyte for lithium-ion power battery and preparation method thereof

A power battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low content, the impact of battery cycle life, and the limited improvement of power battery life, so as to improve high-temperature conductivity and facilitate transmission. Full effect on de-intercalation, capacity and cycle performance

Active Publication Date: 2011-01-26
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impact of these two types of additives on the cycle life of the battery at high temperatures has not been explained, and at the same time the content is low, which has a limited effect on the life of the power battery.

Method used

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  • Electrolyte for lithium-ion power battery and preparation method thereof
  • Electrolyte for lithium-ion power battery and preparation method thereof
  • Electrolyte for lithium-ion power battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The first step is to use a rotary evaporator to distill and purify the organic solvents EC, PC, DMC, and EA at 25°C to remove trace water inside, and then use 4A molecular sieves to deeply absorb trace water at 40°C. . This operation is repeated three times until the impurity and water content are less than 0.002%. Then weigh a certain amount of EC, PC, DMC and EA with a microanalytical electronic balance, the mass ratio of the four of them is 3:3:1:1, EC, PC, DMC and EA are mixed with quaternary solvents, and mixed with a graduated cylinder (250ml) Measure 100g of mixed organic solvent and pour it into a grinding bottle. All processes in the preparation of the electrolyte were carried out in a glove box filled with high-purity argon.

[0050] The second step is to weigh 10g LiODFB and 3g LiPF with a microanalytical electronic balance in the glove box at 25°C 6 , and then add it in the above-mentioned quaternary mixed solvent (in the grinding bottle), fully stir even...

Embodiment 2

[0053] The first step is to use a rotary evaporator to distill and purify the organic solvents EC, EMC, and EA at 25°C to remove trace water inside, and then use 4A molecular sieves to deeply absorb trace water at 40°C. This operation is repeated three times until the impurity and water content are less than 0.002%. Then take a certain amount of EC, EMC, and EA with a microanalytical electronic balance, wherein the mass ratio of the three is 5:3:2, EC, EMC, and EA are mixed with a ternary solvent, and 100g is measured with a graduated cylinder (250ml) Pour the mixed organic solvents into the grinding bottle. All processes in the preparation of the electrolyte were carried out in a glove box filled with high-purity argon.

[0054] The second step is to weigh 10g LiODFB and 2g LiBF with a microanalytical electronic balance in the glove box at 25°C 4 , and then add it to the above-mentioned ternary mixed solvent (in the ground-mouth bottle), fully stir until the solution is cle...

Embodiment 3

[0057] In the first step, under the condition of 25°C, the organic solvents EC, DEC, and EA were firstly distilled and purified by a rotary evaporator to remove trace water inside, and then the trace water was deeply adsorbed by 4A molecular sieves at 40°C. This operation is repeated three times until the impurity and water content are less than 0.002%. Then take a certain amount of EC, DEC, and EA with a microanalytical electronic balance, wherein the mass ratio of the three is 4:3:1, EC, DEC, and EA are mixed with ternary solvents, and a graduated cylinder (250ml) measures 100g of mixed Pour the organic solvent into the grinding bottle. All processes in the preparation of the electrolyte were carried out in a glove box filled with high-purity argon.

[0058] The second step is to weigh 7g LiODFB and 6gLiN(SO 2 CF 3 ) 2 , and then add it to the above-mentioned ternary mixed solvent (in the ground-mouth bottle), fully stir until the solution is clear and free of precipitat...

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Abstract

The invention discloses an electrolyte for a lithium-ion power battery, which comprises lithium salts, organic solvents and additives, wherein the lithium salts comprise at least one of LiODFB, LiPF6, LiClO4, LiBF4, LiAsF6, LiCF3SO3, LiN(SO2CF3)2 and LiBOB; the invention also discloses a preparation of the electrolyte, which comprises the following steps: mixing the organic solvents after impurities and water are removed; (2) adding the lithium salts in the mixed organic solvents, evenly stirring till the solution is clear and has no sediments, and allowing the solution to stand for at least half an hour to obtain mixed solution; (3) adding the additives into the mixed solution, evenly stirring, and then allowing the mixed solution to stand to obtain the required electrolyte. The invention improves the cycle performance of the battery at the high temperature, prevents gas explosion caused by electrolyte decomposition, can remarkably promote the long-life function of the volume conservation rate of the lithium-ion power battery at the high temperature, and has simple preparation method and easy industrialization production simultaneously.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte system, in particular to an electrolyte for improving the high-temperature and long-life function of a lithium-ion power battery and a preparation method thereof. Background technique [0002] In recent years, due to the pressure of environmental pollution and energy shortage, countries are forced to find new green, environmentally friendly and sustainable energy sources. The green, high-energy and environmentally friendly lithium-ion power batteries that appeared in the 1990s have become one of the most eye-catching power sources due to their high energy density, long cycle life, and high operating voltage. Jonhson Control (Johnson Control), Japan's Sony, Panasonic, Yuasa (Gs-yuasa), NEC, Hitachi, Japan Storage Battery Company (JSB), France's Saft, South Korea's LG, SDI, Germany's Varta, and domestic BYD, Wanxiang, etc. A batch of battery and automobile companies have paid great attention. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/38
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 李凡群刘昊邓龙征吕小三
Owner WANXIANG 123 CO LTD
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