Electrolyte containing inorganic additive and lithium-ion battery containing electrolyte

A lithium-ion battery, inorganic additive technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of reducing battery cycle performance and stability, easily generating hydrogen fluoride, polluting the environment, etc., achieving good cycle performance, reducing water The effect of content and coating uniformity

Inactive Publication Date: 2016-09-14
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium battery electrolyte needs to strictly control the water content, usually less than 20ppm. If the water content exceeds the standard, it will easily produce harmful gases such as hydrogen fluoride or fluorine gas during the operation of the lithium battery, which will reduce the cycle performance and stability of the battery, corrode the battery and pollute the environment.
However, the control of the water content of the electrolyte used in lithium batteries still needs further improvement.

Method used

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  • Electrolyte containing inorganic additive and lithium-ion battery containing electrolyte
  • Electrolyte containing inorganic additive and lithium-ion battery containing electrolyte
  • Electrolyte containing inorganic additive and lithium-ion battery containing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The electrolyte uses a mixture of ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) with a weight ratio of 1:1:1 as the organic solvent, and the electrolyte uses 1M LiCF 3 SO 3 , 1% organic additives (VC:ES=1:1), 0.1% inorganic additives (SiO 2 :Al 2 O 3 =1:2), mix well. Lithium cobalt oxide is used as the positive electrode material, and the lithium sheet is used as the negative electrode material. The button battery is assembled and tested. The charge and discharge range is 3.0V-4.5V. The test results are shown in Table 1.

Embodiment 2

[0038] The electrolyte uses a mixture of ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) with a weight ratio of 1:1:1 as the organic solvent, and the electrolyte uses 1M LiCF 3 SO 3 , 1% organic additives (VC:ES=1:1), 0.4% inorganic additives (SiO 2 :Al 2 O 3 =1:2), mix well. Lithium cobaltate was used as the positive electrode material, and the lithium sheet was used as the negative electrode material. They were assembled into a button cell and tested. The charge and discharge range is 3.0V-4.5V. The test results are shown in Table 1.

Embodiment 3

[0040] The electrolyte uses a mixture of ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) with a weight ratio of 1:1:1 as the organic solvent, and the electrolyte uses 1M LiCF 3 SO 3 , 1% organic additives (VC:ES=1:1), 0.8% inorganic additives (SiO 2 :Al 2 O 3 =1:2), mix well. Lithium cobaltate was used as the positive electrode material, and the lithium sheet was used as the negative electrode material. They were assembled into a button cell and tested. The charge and discharge range is 3.0V-4.5V. The test results are shown in Table 1.

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Abstract

The invention discloses an electrolyte containing an inorganic additive and a lithium-ion battery containing the electrolyte. The electrolyte comprises an organic solvent, a lithium salt electrolyte, the inorganic additive and an organic additive; the inorganic additive is one or a mixture of two or more of dry aluminum oxide, dry silicon oxide, dry magnesium oxide, dry zinc oxide and dry titanium dioxide and has the particle size less than 100 nm. The electrolyte provided by the invention can reduce the surface activity of a cathode material, thereby suppressing side reaction between an electrode material and the electrolyte, increasing a battery charging voltage and improving the cycle comprehensive performance of the electrolyte, can improve wettability and good imbibition of the electrolyte for a diaphragm and suppress a micro-short circuit, can efficiently improve the electrochemical performance of a lithium battery for neutralizing free harmful gases such as hydrogen fluoride and fluorine gas, and can reduce water content in the electrolyte.

Description

Technical field [0001] The invention belongs to the field of lithium ion battery electrolyte, and particularly relates to an electrolyte containing inorganic additives and a lithium ion battery containing the electrolyte. Background technique [0002] Currently, the cathode materials of commercial lithium batteries mainly include lithium cobalt oxide and ternary materials (LiNi x Co y Mn 1-x-y O 2 , LiNi x Co y Al 1-x-y O 2 ), lithium iron phosphate and other materials. In the actual application process, in order to maintain the cycle stability of the cathode material, the charge cut-off voltage generally does not exceed 4.2V (vs. Li + / Li). With the continuous improvement of technology and the continuous demand of the market, high-energy density lithium batteries have become a research hotspot in the future. [0003] Increasing the battery voltage can be achieved by improving the performance of electrode materials or developing a new type of high-voltage resistant electrolyte to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 徐保民钟熊伟孙政唐俊
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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