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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of electrochemical materials, can solve the problems of unusability and poor low-temperature performance of lithium-ion batteries, and achieve good solubility, good chemical stability, good electrochemical performance and stability. Effect

Active Publication Date: 2017-09-12
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a lithium-ion battery electrolyte and a lithium-ion battery for the poor low-temperature performance of the lithium-ion battery and the problem that it cannot be used at a low temperature.

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Ethylene carbonate, 2-butanone and dichloromethane are formulated into a ternary blend solvent in a mass ratio of 2:2:6; then LiPF is added to the above ternary blend solvent 6 Formulated as LiPF 6 Lithium-ion battery electrolyte with a concentration of 1mol / L.

[0043] The positive electrode current collector with the positive electrode active material attached thereto, the separator, and the negative electrode current collector with the negative electrode active material attached thereto are laminated, and then wound to obtain a cell. Among them, the positive electrode current collector is aluminum foil, and the positive electrode active material is composed of 90% LiCoO 2 , 5% carbon black and 5% binder, the thickness of the positive electrode current collector is 10 μm, and the thickness of the coating formed by the positive electrode active material is 80 μm; the negative electrode current collector is copper foil, and the negative electrode active material is com...

Embodiment 2

[0046]Ethylene carbonate, 2-butanone and dichloromethane are formulated into a ternary blend solvent in a mass ratio of 2:4:4; then LiBF is added to the above ternary blend solvent 4 formulated as LiBF 4 Lithium-ion battery electrolyte with a concentration of 1.2mol / L.

[0047] The positive electrode current collector with the positive electrode active material attached thereto, the separator, and the negative electrode current collector with the negative electrode active material attached thereto are laminated, and then wound to obtain a cell. Among them, the positive electrode current collector is aluminum foil, and the positive electrode active material is composed of 92% LiCoO 2 , 4% carbon black and 4% binder, the thickness of the positive electrode current collector is 30 μm, and the thickness of the coating formed by the positive electrode active material is 110 μm; the negative electrode current collector is copper foil, and the negative electrode active material is c...

Embodiment 3

[0050] Ethylene carbonate, 2-butanone and methylene chloride are formulated into a ternary blend solvent in a mass ratio of 2:1:7; then LiClO is added to the above ternary blend solvent 4 formulated as LiClO 4 Lithium-ion battery electrolyte with a concentration of 1.1mol / L.

[0051] The positive electrode current collector with the positive electrode active material attached thereto, the separator, and the negative electrode current collector with the negative electrode active material attached thereto are laminated, and then wound to obtain a cell. Among them, the positive electrode current collector is aluminum foil, and the positive electrode active material is composed of 92% LiCoO 2 , 4% carbon black and 4% binder, the thickness of the positive electrode current collector is 16 μm, and the thickness of the coating formed by the positive electrode active material is 96 μm; the negative electrode current collector is copper foil, and the negative electrode active material...

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Abstract

The invention relates to a lithium ion battery electrolyte and a lithium ion battery. The lithium ion battery electrolyte comprises solvents and lithium salt, and the solvents include ethylene carbonate, 2-butanone and dichloromethane according to a mass ratio of 1-2:1-7:1-7. Ethylene carbonate, 2-butanone and dichloromethane are used as the solvents, ethylene carbonate can form a stable SEI film during use, and 2-butanone and dichloromethane have low melting point, has high chemical stability at normal temperature and low temperature and can still present high solubility at low temperature. The above solvents are matched in use and reasonably proportioned, so that the lithium ion battery electrolyte and the lithium ion battery have good electrochemical performance and stability at low temperature.

Description

technical field [0001] The invention relates to the technical field of electrochemical materials, in particular to lithium-ion battery electrolytes and lithium-ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high energy density, long cycle life, low self-discharge rate, no memory effect and green ring. Since Sony first developed lithium-ion batteries in 1990, due to its many advantages, it has achieved rapid development, and its applications have penetrated into many fields such as civilian and military applications. [0003] The electrolyte is a solution with ion conductivity, which provides ions for the normal operation of the battery and is an important part of the battery. At present, the electrolyte of commercial lithium batteries is generally carbonate. Although its conductivity is high, some carbonate solvents solidify due to the high melting point at low temperature, and the electrolyte precipitation causes the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0569
CPCH01M10/0525H01M10/0569Y02E60/10
Inventor 袁美蓉徐永进王臣杨红平罗旭芳赵祖珍郑斌
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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