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High-entropy oxide lithium ion battery negative electrode material with high conductivity and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., to achieve the effect of improving conductivity and improving electrochemical performance

Active Publication Date: 2021-04-02
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For HEOs, how to improve the electronic conductivity of HEOs materials has not been reported yet.

Method used

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  • High-entropy oxide lithium ion battery negative electrode material with high conductivity and preparation method thereof
  • High-entropy oxide lithium ion battery negative electrode material with high conductivity and preparation method thereof
  • High-entropy oxide lithium ion battery negative electrode material with high conductivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]A spine-type high entropy oxide lithium ion negative electrode material having high conductivity, molecular formula (CoCrcufeni)3 / 5O4-δ : Weigh the equimolar amount of metal nitrate, specifically 5.821 g of CO (NO3)2· 6h2O, 8.003G CR (NO3)3· 9h2O, 4.832G Cu (NO3)2· 3h2O, 8.080g Fe (NO3)3· 9h2O and 5.816G Ni (NO3)2· 6h2O Soluble in 10 ml of distilled water, stirred and uniformly gave a mixed solution of the metal salt; then weighted 0.150 g of glycine to add a mixed solution, and the magnetic force was stirred for 1 h after drying to obtain a gel at 60 ° C, and the gel was placed in gold. 500 ° C in the furnace furnace reaction for 20 min, resulting in a porous structure, 23.1% oxygen space and a small amount of Cr3Ni2Cocrcufeni3 / 5O4-δ High entropy oxide powder material, the XRD, SEM and O1S of the powder material, such asfigure 1 ,figure 2 Repeated with Figure 3.

[0032]As the active substance, SuperP carbon black is a conductive agent, and the polyvinylidene fluoride (PVDF) is ...

Embodiment 2

[0035]A spine-type high entropy oxide lithium ion negative electrode material having high conductivity, molecular formula (CoCrcufeni)3 / 5O4-δ : Weigh the equimolar amount of metal nitrate, specifically 5.821 g of CO (NO3)2· 6h2O, 8.003G CR (NO3)3· 9h2O, 4.832G Cu (NO3)2· 3h2O, 8.080g Fe (NO3)3· 9h2O and 5.816G Ni (NO3)2· 6h2O Soluble in 20 ml of distilled water, stir well to obtain a mixed solution of a metal salt; then 0.300 g of urea is added to the mixed solution, and the magnetic force is stirred at 80 ° C to dry the gel, and then placed in the gel The gold furnace Muff furnace is 50 min to obtain a porous structure, 16.2% oxygen space and a small amount of Cr.3Ni2Cocrcufeni3 / 5O4-δ High entropy oxide powder material.

[0036]As the active substance, Super P carbon black is a conductive agent, and the polyvinylidene fluoride (PVDF) is a binder (mass ratio of 7: 2: 1), which is dissolved in N-methylpyrrolidone after being uniform. The electrode sheet is applied to the neat copper foi...

Embodiment 3

[0039]A spine-type high entropy oxide lithium ion negative electrode material having high conductivity, molecular formula (CoCrcufeni)3 / 5O4-δ : Weigh the equimolar amount of metal nitrate, specifically 5.821 g of CO (NO3)2· 6h2O, 8.003G CR (NO3)3· 9h2O, 4.832G Cu (NO3)2· 3h2O, 8.080g Fe (NO3)3· 9h2O and 5.816G Ni (NO3)2· 6h2O Soluble in 15 ml of distilled water, stir well to obtain a mixed solution of the metal salt; then weighted 0.231 g of ammonium acetate to add a mixed solution, and the magnetic force was stirred at 80 ° C to obtain a gel, and the gel is placed. The reaction was 50 min at 800 ° C in the golden furnace Master furnace to obtain a porous structure, 20.6% oxygen space and a small amount of Cr.3Ni2Cocrcufeni3 / 5O4-δ High entropy oxide powder material.

[0040]As the active substance, SuperP carbon black is a conductive agent, and the polyvinylidene fluoride (PVDF) is a binder (mass ratio of 7: 2: 1), and is dissolved in N-methylpyrrolidone to make a slurry uniformly. The...

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Abstract

The invention discloses a high-entropy oxide lithium ion battery negative electrode material with high conductivity and a preparation method, a chemical formula of the high-entropy oxide lithium ion battery negative electrode material is (CoCrCuFeNi)3 / 5O4-delta, and delta is oxygen vacancy concentration; according to the material, reasonable metal elements Co, Cr, Cu, Fe and Ni are selected, and asmall amount of dispersedly distributed high-conductivity metal particles are introduced into a spinel type high-entropy oxide matrix through a solution combustion reaction one-step method; on the other hand, oxygen vacancy of the spinel type high-entropy oxide is improved by controlling the reaction conditions. By introducing high-conductivity dispersed metal particles and oxygen vacancies, theconductivity of the spinel type (CoCrCuFeNi)3 / 5O4-delta high-entropy oxide lithium ion negative electrode material is improved, so electrochemical performance is improved; by regulating and controlling reaction conditions, lithium ion negative electrode materials with different contents of oxygen vacancies and dispersed conductive metal particles can be prepared, and certain specific use requirements are met.

Description

Technical field[0001]The present invention relates to the field of battery materials, and more particularly to a highly conductive high-entropy oxide lithium ion battery anode material and a preparation method.Background technique[0002]In order to meet the higher energy / power density of lithium ion batteries, longer circulating life, better safety performance development needs, the exploration of new negative materials other than carbon negative electrode is increasingly important. In recent years, the transition metal-based high entropy oxide (TM-HEOS) has been used as a lithium ion negative electrode material, and since highly constant entropy stable crystal structure exhibits high cycle stability, since the multi-main element effect exhibits high theoretical specific capacity. Therefore, TM-TEOS has aroused great interest in major scientific research workers as energy conversion materials.[0003]About HEOS as a lithium-ion battery negative electrode material, before, mainly conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/523H01M4/626H01M10/0525Y02E60/10
Inventor 冒爱琴陆文宇陈雨雪郑翠红檀杰俞海云
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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