Composite positive electrode material, battery positive electrode, lithium battery and application thereof

A composite positive electrode material and battery positive electrode technology, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of poor conductivity and limit the high energy density of lithium-sulfur batteries, so as to delay polarization and improve Effects of long cycle stability and Coulomb effect

Pending Publication Date: 2022-07-29
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the positive electrode materials of selenium or sulfur and their compounds face difficulties such as poor conductivity, dissolution and shuttling in organic electrolytes, and the need to introduce a large amount of inert materials such as carbon conductive materials for modification, which severely limits the development of lithium-sulfur materials. The use of high energy density of batteries

Method used

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  • Composite positive electrode material, battery positive electrode, lithium battery and application thereof
  • Composite positive electrode material, battery positive electrode, lithium battery and application thereof
  • Composite positive electrode material, battery positive electrode, lithium battery and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] This embodiment provides a composite positive electrode material, the positive electrode active material is Se (x=1), the first coating layer material is acetylene black conductive material, and the second coating layer is Li 0.455 Ho 0.182 Cl (M=Ho, b=0.545, b=0.182) chloride material (Se, the mass ratio of the first cladding layer and the second cladding layer is 5:1:5, and the active content of Se accounts for the content of the entire composite cathode as 45.5wt%) preparation method is as follows:

[0061] Weigh 0.5 g of commercially purchased elemental selenium powder and 0.05 g of acetylene black, respectively, and then compound them by ball milling. The ball milling speed is 400 rpm and the ball milling time is 5 hours. The obtained sample is modified with the first coating layer. Se material. At the same time, the commercially purchased anhydrous LiCl and anhydrous HoCl were prepared by eutectic reaction. 3 The eutectic reaction was carried out according to t...

Embodiment 2

[0065] This embodiment provides a composite positive electrode material, and the positive electrode active material is S 0.25 Se 0.75 (x=0.75), the material of the first cladding layer is carbon nanotube conductive material, and the second cladding layer is Li 0.5 In 0.167 Cl(M=In, b=0.5, c=0.167) chloride material (S 0.25 Se 0.75 , the mass ratio of the first cladding layer and the second cladding layer is 10:1:5, S 0.25 Se 0.75 The active content accounts for 62.5wt% of the entire composite positive electrode) and the preparation method is as follows:

[0066] Weigh 0.592 grams of commercially purchased elemental selenium powder and 0.16 grams of elemental sulfur powder, respectively, and grind them with a mortar for 30 minutes to uniformity. Then, pour the ground samples into a single-head sealed quartz tube, and seal it by vacuum sealing. Then put it in a muffle furnace and react at 350 degrees Celsius for 24 hours, then take it out in the glove box and grind it into...

Embodiment 3

[0069] This embodiment provides a composite positive electrode material, and the positive electrode active material is P 4 S 30 (n=20), the material of the first cladding layer is porous carbon conductive material, and the material of the second cladding layer is Li 0.5 Y 0.167 Cl(M=Y, b=0.5, c=0.167) chloride material (P 4 S 30 , the mass ratio of the first cladding layer and the second cladding layer is 10:1:11, and the Se active content accounts for 45.5wt% of the entire composite positive electrode) The preparation method is as follows:

[0070] Weigh 0.124 g of commercially purchased elemental red phosphorus and 0.96 g of elemental sulfur powder, respectively, and grind them in a mortar for 30 minutes until uniform, then pour the ground samples into a single-head sealed quartz tube, and seal it by vacuum sealing. Then put it in a muffle furnace and react at 350 degrees Celsius for 24 hours, then take it out in the glove box and grind it into powder to obtain P 4 S 3...

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Abstract

The invention relates to the technical field of batteries, in particular to a composite positive electrode material, a battery positive electrode, a lithium battery and application thereof. The composite positive electrode material comprises a substrate and double coating layers coating the substrate, the first layer of the double coating layer comprises an electron conduction material, and the second layer comprises a chlorine-containing compound with high room temperature lithium ion conductivity; the matrix comprises a non-metallic element or a derivative thereof with electrochemical lithium storage activity, and the non-metallic element is one or more of selenium, sulfur or tellurium; and the matrix accounts for more than 40wt% of the mass of the whole composite positive electrode material. According to the invention, the active material with electrochemical lithium storage activity is coated with two layers of specific materials, so that the active content, reversible capacity, first effect, rate capability or long cycle performance of the positive electrode active material in the whole electrode are effectively improved, and the preparation of a lithium battery with higher coulombic effect and cycle stability is facilitated.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a composite positive electrode material, a battery positive electrode, a lithium battery and applications thereof. Background technique [0002] In recent years, electric vehicles have become one of the common choices for people's daily travel due to the consideration of environmental protection and clean energy use. As a key part of the practical application of electric vehicles, a lot of research work has been devoted to the development of high-energy-density lithium-ion secondary batteries. At present, for the current popular solid-state lithium-ion battery system, the cathode material generally adopts layered transition metal oxide LiMO 2 (M=Ni, Co, Mn, Al), LiFePO 4 , and lithium-rich lithium manganese oxides, but these materials have problems such as low capacity and poor capacity density. [0003] In order to increase the energy density, the amount of electricity stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/42
CPCH01M4/366H01M4/5815H01M4/628H01M10/0525H01M10/4235H01M2004/028
Inventor 孙学良李晓娜梁剑文王建涛杨容赵春荣弓胜民
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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