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Low-temperature electrolytic solution applied to NCM111 lithium battery

An NCM111 and electrolyte technology, which is applied in the field of electrochemical energy storage, can solve the problems of difficult synthesis of additives and high cost of electrolyte, and achieve the effects of high and low temperature ionic conductivity, low price and simple preparation method.

Inactive Publication Date: 2021-02-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electrolyte of the above-mentioned patent application improves the performance of the battery at low temperature, there are defects that the electrolyte is expensive or the additives are difficult to synthesize. Therefore, it is of great significance to develop a low-cost electrolyte that can be applied to lithium batteries

Method used

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  • Low-temperature electrolytic solution applied to NCM111 lithium battery
  • Low-temperature electrolytic solution applied to NCM111 lithium battery
  • Low-temperature electrolytic solution applied to NCM111 lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. Measure 0.8ml of propylene carbonate, 1.6ml of diethyl carbonate, 1.6ml of ethyl propionate, 40ul of vinylene carbonate, 40ul of fluoroethylene carbonate, mix well, then add a4 Molecular sieve treatment for 24 hours, remove the molecular sieve, and filter; let the filtered filtrate stand, take the upper 3ml filtrate for later use;

[0031] Step 2. Weigh 0.216g of lithium difluorooxalate borate, 0.168g of lithium bisfluorosulfonyl imide and 0.232g of lithium bis(pentafluoroethylsulfonyl)imide, and add 3ml of the electrolyte obtained in step 1 The low-temperature electrolyte can be obtained after thorough mixing in the solvent.

Embodiment 2

[0033] Step 1. Measure 0.8ml of propylene carbonate, 1.6ml of diethyl carbonate, 1.6ml of ethyl butyrate, 40ul of ethylene ethylene carbonate, and 40ul of fluoroethylene carbonate, mix well and add a4 Molecular sieve treatment for 26 hours, remove the molecular sieve, and filter; let the filtered filtrate stand, and take the upper 3ml filtrate for later use;

[0034] Step 2. Weigh 0.216g of lithium difluorooxalate borate and 0.281g of lithium bisfluorosulfonyl imide, add them into the 3ml electrolyte solvent obtained in step 1, and mix thoroughly to obtain the low-temperature electrolyte.

Embodiment 3

[0036] Step 1. Measure 0.8ml of propylene carbonate, 1.6ml of ethyl methyl carbonate, 1.6ml of ethyl propionate, 40ul of ethylene ethylene carbonate, and 40ul of vinyl sulfite, mix well, then add a4 Molecular sieve treatment for 28 hours, remove the molecular sieve, and filter; let the filtered electrolyte solvent stand, take the upper 3ml electrolyte solvent for later use;

[0037] Step 2. Weigh 0.086g of lithium difluorooxalate borate, 0.168g of lithium bisfluorosulfonimide, and 0.228g of lithium hexafluorophosphate, add them to the 3ml electrolyte solvent obtained in step 1, and mix thoroughly to obtain the obtained low temperature electrolyte.

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Abstract

The invention discloses a low-temperature electrolytic solution applied to an NCM111 lithium battery, and belongs to the technical field of electrochemical energy storage. The low-temperature electrolytic solution comprises a lithium salt solute, a solvent consisting of carbonic ester and carboxylic ester, and an additive, wherein in the solvent, the volume percentage contents of the carbonic ester and the carboxylic ester are as follows: 25-60 vol% of the carbonic ester and 40-75 vol% of the carboxylic ester, the concentration of the lithium salt in the solvent is 0.8-1.2 mol / L, the additiveaccounts for 1-2% of the volume of the solvent, and the lithium salt solute is various lithium salts. According to the invention, the mixed lithium salt is adopted in the low-temperature electrolyticsolution, so that compared with a single lithium salt, an SEI film which is smaller in impedance and beneficial for lithium ions to penetrate through is easily formed on the negative electrode, and the specific discharge capacity of the lithium battery at the low temperature is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and in particular relates to a low-temperature electrolyte applied to NCM111 lithium batteries. Background technique [0002] With the continuous acceleration of the exploitation and consumption of fossil resources, the problems of environmental pollution and energy shortage are becoming more and more serious. All countries in the world are urgently looking for clean, renewable, safe and reliable new energy sources. However, clean energy such as wind energy and solar energy is random and uncontrollable, and direct access to the grid system will affect the stability of electric energy. In order to realize the flexible access of clean energy to the grid, setting up an energy storage system at the power generation end will be the best solution. [0003] Lithium batteries have the advantages of high energy density, high discharge platform, and long cycle life. Since their comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/058H01M10/052
CPCH01M10/052H01M10/0568H01M10/058Y02E60/10Y02P70/50
Inventor 冯婷婷杨国柱吴孟强王俊超陈诚殷郑丽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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