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Electrolyte capable of preventing spinel lithium titanate-based lithium ion secondary battery from being swollen

An anti-lithium titanate, electrolyte technology, applied in secondary batteries, electrical components, circuits, etc., can solve the problems of battery gas production, no SEI film protection, easy to catalyze electrolyte reduction, etc. Excellent performance, good high temperature stability

Active Publication Date: 2015-05-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, due to the lack of stable SEI film protection, at high temperature, the exposed electrode surface is directly in contact with the electrolyte, which is easy to catalyze the reduction of the electrolyte, resulting in gas production in the battery.

Method used

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  • Electrolyte capable of preventing spinel lithium titanate-based lithium ion secondary battery from being swollen
  • Electrolyte capable of preventing spinel lithium titanate-based lithium ion secondary battery from being swollen
  • Electrolyte capable of preventing spinel lithium titanate-based lithium ion secondary battery from being swollen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] LiPF 6 Dissolve LiDFOB and LiDFOB into electronic-grade organic solvents propylene carbonate (PC) and dimethyl carbonate (DMC) mixed solvents with water below 10ppm respectively, wherein each solvent is configured according to the mass ratio of 30 parts of PC and 70 parts of DMC. mixed solvent, and then add electrolyte salt to it to dissolve, in which LiPF 6 The concentration of LiDFOB is 1.0mol / L, and the concentration of LiDFOB is 0.1mol / L. After the lithium salt is completely dissolved, 0.5% of the total mass of the electrolyte is added as an additive.

[0032] Use the Mettler Karl Fischer C20 coulometric moisture tester to test the water content of the electrolyte ≤ 10ppm; use the acid-base titration method to titrate the acidity of the electrolyte ≤ 15ppm; use the Mettler conductivity meter FE30 to test the water content of the electrolyte at 25°C Conductivity, conductivity ≥ 10ms / cm; contact angle tester to test the wetting performance of the electrolyte. After ...

Embodiment 2

[0037] Mix 20 parts of sulfolane, 20 parts of PC and 60 parts of DMC evenly, after testing that the water content is less than 10ppm, refrigerate and add electrolyte salt LiPF 6 and LiDFOB, where LiPF 6 The concentration of LiDFOB is 1.0mol / L, the concentration of LiDFOB is 0.1mol / L, and then 2% of the additive nicotinamide is added thereto.

[0038] The production and testing of the battery are the same as in Example 1.

Embodiment 3

[0040] Mix 20 parts of sulfolane, 40 parts of PC and 40 parts of DMC evenly, after the water content is less than 10ppm, refrigerate and add electrolyte salt LiPF 6 , LiTFSI and LiBOB, where LiPF 6 The concentration of LiTFSI is 0.8mol / L, the concentration of LiTFSI is 0.2mol / L, the concentration of LiBOB is 0.1mol / L, and 1.2% of additive 3-piperidine carboxamide is added.

[0041] The battery manufacturing and testing methods are the same as in Example 1.

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Abstract

The invention provides an electrolyte system capable of preventing a spinel lithium titanate-based lithium ion secondary battery from being swollen. An additive is added in an organic electrolyte system, and a solid electrolyte membrane layer is formed on the surface of a Li4Ti5O12 electrode due to the reduction reaction of the additive in the battery cycle process to prevent a lithium titanate electrode from directly contacting with an organic electrolyte, and thus the battery is prevented from being swollen; the additive consists of an organic lithium borate salt and an organic matter containing an amide group or imide group, and the addition amount of the additive is 0.2-10wt% of the total weight of the electrolyte system. The organic lithium borate salt is used as a membrane-forming additive of the organic electrolyte, a stable SEI membrane layer is formed on the surface of the electrode due to the reduction reaction of the additive in the battery cycle process, and the organic matter containing the amide group or imide group can be reacted with trace water in the electrolyte, so that the dissociation of LiPF6 at high temperatures is inhibited, and thus the swelling phenomenon is prevented, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to an electrolyte solution system for preventing flatulence of a spinel lithium titanate-based lithium ion secondary battery, and belongs to the technical field of lithium batteries and battery electrolytes. Background technique [0002] With the rapid growth of my country's economy, science and technology have also developed rapidly, which has driven the rapid advancement of the electronics industry and the automobile industry. In order to protect the environment, various electrical appliances and automobiles powered by batteries have also flourished. Before the birth of lithium-ion batteries, lead-acid batteries, nickel-cadmium batteries and zinc-manganese batteries occupied most of the market, while lithium batteries have the characteristics of high specific energy and no heavy metal pollution sources. From the 1990s to the present, lithium-ion batteries After more than 20 years of development, it has gradually established a va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0568H01M10/0525
CPCY02E60/10
Inventor 张兰陈仕谋董坤蔡迎军张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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