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Low-temperature electrolyte and lithium ion battery comprising same

An electrolyte and low temperature technology, which is applied in the field of lithium-ion batteries, can solve the problems of low conductivity of lithium salts, achieve high ion conductivity, enhance wettability, and solve the effect of lithium precipitation on the negative electrode

Active Publication Date: 2020-12-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the battery performance has been improved under general low-temperature environmental conditions, the problem of low conductivity of lithium salts still cannot be solved under ultra-low temperature conditions of -60°C. It is of great significance to improve the application value under extreme conditions

Method used

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  • Low-temperature electrolyte and lithium ion battery comprising same
  • Low-temperature electrolyte and lithium ion battery comprising same
  • Low-temperature electrolyte and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of Embodiment 1 Electrolyte 1 and Experimental Battery 1

[0024] (1) Preparation of Electrolyte 1: In a glove box filled with argon (moisture <0.1ppm, oxygen <0.1ppm), ethylene carbonate, diethyl carbonate, and dimethyl carbonate were mixed in a weight ratio of 3:2 : 5 to mix evenly, then slowly add lithium dicyanoalkoxy haloborate (formula (II)) accounting for 12% of the total weight of the electrolyte, and add 1% of the total weight of the electrolyte after the lithium salt is completely dissolved. Ethylene carbonate was stirred evenly to obtain electrolyte solution 1.

[0025]

[0026] (2) Preparation of positive electrode material: NCM523, acetylene black and PVDF (binder) are mixed according to the weight ratio of 90:5:5, and N-methylpyrrolidone is added to make a slurry, and the slurry is coated on 12 microns On a thick aluminum foil, after drying, it is rolled to obtain the positive electrode material.

[0027] (3) Preparation of negative electr...

Embodiment 2

[0029] Embodiment 2 Preparation of Electrolyte 2 and Experimental Battery 2

[0030] The only difference from Example 1 is that during the preparation of electrolyte solution 2, lithium dicyanoalkoxy haloborate (formula (III)) accounting for 9% of the total weight of the electrolyte solution was added, and after the lithium salt was completely dissolved, 2% of the electrolyte solution was added. 1% by total weight of fluoroethylene carbonate.

[0031]

Embodiment 3

[0032] Embodiment 3 Preparation of Electrolyte 3 and Experimental Battery 3

[0033] The only difference from Example 1 is that during the preparation of electrolyte solution 3, lithium dicyanoalkoxy haloborate (formula (IV)) accounting for 14% of the total weight of the electrolyte solution was added, and the electrolyte solution was added after the lithium salt was completely dissolved. 1% by total weight of fluoroethylene carbonate.

[0034]

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Abstract

The invention discloses a low-temperature electrolyte and a lithium ion battery comprising the same, belonging to the technical field of lithium ion batteries. The low-temperature electrolyte comprises a lithium salt, an organic solvent and a film-forming additive, wherein the lithium salt is dicyanoalkoxy halogenated lithium borate. According to the electrolyte disclosed by the invention, the dicyanoalkoxy halogenated lithium borate is used as the lithium salt and still has relatively high ionic conductivity under an ultralow temperature condition of -60 DEG C, and the dicyanoalkoxy halogenated lithium borate can form a low-impedance stable SEI film on the surface of a negative electrode, so rapid intercalation and deintercalation of lithium ions under a low-temperature condition are facilitated, the problem of lithium precipitation of a negative electrode due to over-low temperature is effectively solved, and more excellent low-temperature discharge and cycle performance can be shownin an ultralow-temperature environment.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a low-temperature electrolyte and a lithium-ion battery including the low-temperature electrolyte. Background technique [0002] Due to its high operating voltage, high specific energy density, long cycle life, and environmental friendliness, lithium-ion batteries have become one of the indispensable and important chemical energy sources in the fields of electronic digital, electric vehicles, energy storage applications, aerospace and other fields. Electrolyte is an important part of lithium-ion batteries. It is called the "blood" of lithium-ion batteries. It is usually composed of lithium salts, solvents and additives. It has an important impact on the cycle performance, rate performance and safety performance of lithium-ion batteries. . Since the electrolyte should meet the requirements of compatibility with positive and negative materials, physical and chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525
CPCH01M10/0568H01M10/0525H01M2300/0025Y02E60/10
Inventor 沈剑张健
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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