A method for improving the performance of ternary cathode materials

A technology for positive electrode materials and performance, applied in the field of improving the performance of ternary positive electrode materials, can solve problems such as poor cycle performance, failure to obtain expected effects, and limited improvement in cycle performance of ternary materials, so as to reduce lithium content and enhance catalytic activity The number of sites, the effect of improving cycle stability

Active Publication Date: 2020-12-22
郭芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Compared with other cathode materials, ternary materials have the advantages of high energy density and long cycle life, but their cycle performance is poor. At present, various enterprises, universities, and research institutes have also developed a series of methods to improve the cycle performance of ternary materials, but These methods have limited improvement on the cycle performance of ternary materials, and the expected results cannot be obtained in actual use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Accurately weigh carbon black, ammonium tetrathiomolybdate, ternary cathode material, deionized water, and absolute ethanol for later use. The carbon black that weighs is poured into the deionized water that takes, adopt ultrasonic instrument 50kHz supersonic dispersion treatment 30min to obtain carbon black dispersion liquid, the mass concentration of carbon black in the carbon black dispersion liquid is 5g / L, tetrathiomolybdic acid Ammonium was added to the carbon black dispersion and magnetically stirred and mixed for 5 minutes to obtain a mixed solution A. Ammonium tetrathiomolybdate was added according to the ratio of carbon black and ammonium tetrathiomolybdate in the mixed solution A to a mass ratio of 1:2. Then move the mixed solution A to a polytetrafluoroethylene reactor (polytetrafluoroethylene-lined reactor, the same below), seal the polytetrafluoroethylene reactor and move it to oven A (air heat or water heat, the same below). ) at 250°C for 20 hours. Afte...

Embodiment 2

[0024] Accurately weigh molybdenum disulfide and add it to absolute ethanol, and use an ultrasonic instrument for 50kHz ultrasonic dispersion treatment for 2 hours to obtain a molybdenum disulfide dispersion. The mass concentration of molybdenum disulfide in the molybdenum disulfide dispersion is 0.7g / L. A certain amount of ternary positive electrode material is added in the molybdenum disulfide dispersion liquid and magnetically stirred and mixed for 1h to obtain mixed solution B. After the ternary positive electrode material is added, molybdenum disulfide and the ternary positive electrode material in the mixed solution B are mixed according to the molybdenum element and lithium element in 4: Compatible with a molar ratio of 1, move the mixed solution B into the polytetrafluoroethylene reactor, seal the polytetrafluoroethylene reactor and move it to the oven B at 200 ° C for 10 hours of heat preservation and reaction. After the reaction, close the oven B and let it cool natura...

Embodiment 3

[0026] The modified ternary cathode material obtained in Example 1 is assembled into a lithium ion battery (recorded as test 1), the negative electrode adopts metal lithium sheet, and the electrolyte in the lithium ion battery is the LiPF of 1.0mol / L 6 (EC / EMC=3:7), the performance of the lithium battery is tested.

[0027] The modified ternary cathode material obtained in Example 2 is assembled into a lithium-ion battery (referred to as test 2), and the negative electrode adopts a metal lithium sheet, and the electrolyte in the lithium-ion battery is the LiPF of 1.0mol / L 6 (EC / EMC=3:7), the performance of the lithium battery is tested.

[0028] The uncoated ternary cathode material (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) to assemble a lithium-ion battery (recorded as test 3), the negative electrode adopts a metal lithium sheet, and the electrolyte in the lithium-ion battery is LiPF of 1.0mol / L 6 (EC / EMC=3:7), the performance of the lithium battery is tested.

[0029] The lithium-...

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Abstract

The invention discloses a method for improving the performance of a ternary cathode material, and the method comprises the following steps: preparation of a modified molybdenum sulfur substance modified by carbon black, and use of the modified molybdenum sulfur substance for coating modification of the ternary cathode material. The surface of the ternary cathode material is coated with the modified molybdenum sulfur substance, the modified molybdenum sulfur substance has good cycle stability, the modified molybdenum sulfur substance has a stable structure in an electrolyte, can prevent the electrolyte from corroding an electrode, prevents the occurrence of side reactions in the electrode, inhibits the phenomenon that nickel and lithium are in mixed arrangement in the electrode, reduces the residual lithium content on the surface of the electrode, and stabilizes the layered structure of the ternary cathode material, lithium ions can be stably inserted and extracted, the cycling stability of the ternary cathode material is improved, and full electrochemical performances of the ternary cathode material can be ensured.

Description

technical field [0001] The invention relates to the field of battery cathode material production, in particular to a method for improving the performance of ternary cathode materials. Background technique [0002] Compared with other cathode materials, ternary materials have the advantages of high energy density and long cycle life, but their cycle performance is poor. At present, various enterprises, universities, and research institutes have also developed a series of methods to improve the cycle performance of ternary materials, but These methods have limited improvement on the cycle performance of ternary materials, and the expected effect cannot be obtained in actual use. Therefore, it is necessary to provide a more obvious method for improving the effect. Contents of the invention [0003] The purpose of the present invention is to provide a method for improving the performance of the ternary cathode material, which can significantly improve the cycle performance of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M4/38H01M10/42H01M10/0525H01M4/505H01M4/525
CPCH01M4/36H01M4/38H01M4/505H01M4/525H01M4/5815H01M4/583H01M4/625H01M10/0525H01M10/4235Y02E60/10
Inventor 王月兰
Owner 郭芬
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