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Ternary positive electrode material coated with MoSe2 through vapor deposition and preparation method thereof

A cathode material, vapor deposition technology, applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problems of capacity loss, surface structure damage of high nickel materials, etc. performance effect

Pending Publication Date: 2021-12-03
深圳道童新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The commonly used coating methods are liquid phase and solid phase. The coating technology based on aqueous solution system in the liquid phase method may lead to the destruction of the surface structure and capacity loss of high-nickel materials.

Method used

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  • Ternary positive electrode material coated with MoSe2 through vapor deposition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh lithium hydroxide and ternary precursor material (Ni 0.8 co 0.1 mn 0.1 (OH) 2 、Ni 0.6 co 0.2 mn 0.2 (OH) 2 ), mixed ball milling for 30min at a speed of 300r / min, then placed in a tube furnace, fed with oxygen, pre-fired at 480°C for 5h, then kept at 780°C for 14h, and the heating rate was 3°C / min to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 、LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary cathode material.

[0030] (2) Take 10g of the positive electrode material prepared in the above steps, 0.12g of selenium powder, and 0.11g of molybdenum trioxide powder, mix and grind for 30min, put it into a tube furnace, feed in argon, heat up to 550°C, keep it warm for 6h, and put it in a ternary furnace. Formation of MoSe between material particles 2 gas atmosphere, and then cooled to room temperature, so that molybdenum diselenide is deposited on the surface of the ternary material to obtain MoSe 2 Coated LiNi 0.8 co 0.1 mn 0.1 o 2 、LiNi 0.6 co 0.2 mn 0.2 o 2 Cathod...

Embodiment 2

[0035] (1) Weigh lithium hydroxide and ternary precursor material (Ni 0.8 co 0.1 mn 0.1 (OH) 2 、Ni 0.6 co 0.2 mn 0.2 (OH) 2 ), mixed ball milling for 30min at a speed of 300r / min, then placed in a tube furnace, fed with oxygen, pre-fired at 480°C for 5h, then kept at 780°C for 14h, and the heating rate was 3°C / min to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 、LiNi 0.6co 0.2 mn 0.2 o 2 Ternary cathode material.

[0036] (2) Take 10g of the positive electrode material prepared in the above steps, 0.24g of selenium powder, and 0.22g of molybdenum trioxide powder, mix and grind for 30min, put it into a tube furnace, feed in argon, heat up to 650°C, keep it warm for 5h, and put it in a ternary furnace. A molybdenum selenide gas atmosphere is formed between the material particles, and then cooled to room temperature, so that molybdenum selenide is deposited on the surface of the material, and finally forms a gas phase coating MoSe 2 LiNi 0.8 co 0.1 mn 0.1 o 2 、LiNi 0.6 c...

Embodiment 3

[0041] (1) Weigh lithium hydroxide and ternary precursor material (Ni 0.8 co 0.1 mn 0.1 (OH) 2 、Ni 0.6 co 0.2 mn 0.2 (OH) 2 ), mixed ball milling for 30min at a speed of 300r / min, then placed in a tube furnace, fed with oxygen, pre-fired at 480°C for 5h, then kept at 780°C for 14h, and the heating rate was 3°C / min to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 、LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary cathode material.

[0042] (2) Take 10g of the above materials, 0.48g of selenium powder, and 0.44g of molybdenum trioxide powder, mix and grind for 30 minutes, put them into a tube furnace, pass in argon gas, heat up to 750°C, keep it warm for 5 hours, and place it between the ternary material particles Form a molybdenum selenide gas atmosphere, then cool to room temperature, so that molybdenum selenide is deposited on the surface of the material, and finally form a gas phase coated MoSe 2 LiNi 0.8 co 0.1 mn 0.1 o 2 、LiNi 0.6 co 0.2 mn 0.2 o 2 Material, MoSe 2 The coatin...

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Abstract

The invention relates to a ternary positive electrode material coated with MoSe2 through vapor deposition and a preparation method thereof, and aims to provide the ternary positive electrode material coated with MoSe2 through vapor deposition and the preparation method thereof, which can construct a uniform conductive coating layer on the surface of a ternary material so as to improve the material circulation and rate capability. The preparation method is characterized by sequentially comprising the following steps of: 1) uniformly mixing a NixCoyMn(1-x-y)(OH)2 precursor and a lithium source according to a molar ratio of 1:(1.02-1.06), putting the mixture into a crucible, putting the crucible into a tubular furnace, and carrying out heat treatment in an oxygen atmosphere to obtain a LiNixCoyMn(1-x-y)O2 positive electrode material; (2) mixing MoO3 powder, selenium powder and the LiNixCoyMn(1-x-y)O2 prepared in the step (1), then putting the mixture into the tubular furnace, carrying out heat treatment on the mixture in the inert gas atmosphere, and cooling the product to the room temperature after heat treatment is completed, so that molybdenum diselenide is deposited on the surface of a ternary material, and then the gas phase coated MoSe2 LiNixCoyMn(1-x-y)O2 material can be formed. The ternary positive electrode material and the preparation method belong to the field of lithium ion battery materials.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a ternary positive electrode material coated with MoSe2 by vapor deposition, and also relates to a preparation method of the ternary positive electrode material. Background technique [0002] Lithium-ion battery is currently the most widely used high-performance battery, which has the advantages of high voltage, long cycle life, and low environmental pollution. It has developed into a key direction of my country's new energy industry. Cathode material is the key factor affecting the performance and cost of lithium-ion batteries. As a new type of cathode material, due to the synergistic effect of nickel, cobalt and manganese, the comprehensive electrochemical performance is better than that of single-component lithium cobalt oxide, lithium manganese oxide and lithium nickelate. However, compared with lithium cobalt oxide, it has lower cost and less toxicit...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/525H01M4/505H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 郑大伟刘富德彭陈阳钟建业熊汉琴
Owner 深圳道童新能源有限公司
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