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A kind of preparation method of modified nickel cobalt lithium manganate electrode material

A technology of nickel cobalt lithium manganate and electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of material cycle performance, thermal stability performance, and safety performance reduction, and achieve electrochemical performance improvement and electrical conductivity. , the effect of improving the stability of the crystal structure

Active Publication Date: 2020-10-16
成都宏焘新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in order to pursue higher energy density, specific capacity and lower production cost, the content of nickel metal is gradually increased, but with the increase of nickel content, the cycle performance, thermal stability and safety performance of the material are gradually reduced. , it is difficult to achieve the goal of both

Method used

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  • A kind of preparation method of modified nickel cobalt lithium manganate electrode material
  • A kind of preparation method of modified nickel cobalt lithium manganate electrode material

Examples

Experimental program
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Effect test

example 1

[0029] Take the organic solvent xylene alone as the carbon source, and after dehydration treatment, place it in the evaporation zone to form a mixed gas at a temperature of 50-100°C. The mixed gas enters the vacuum carbonization chamber (that is, the above-mentioned carbon coating area), and the nickel-cobalt-manganese lithium material for carbon recombination is uniformly dispersed in the deposition area using ternary NCM111. The carbonization deposition temperature is 1200-1400°C, and the deposition time is 5~ 8h, control the thickness of the deposited carbon layer to be 8-10 nm. After 500 cycles, the capacity retention rate and coulombic efficiency are 99%, and the capacity is 160mAhg -1 It can be seen that, compared with the existing nickel cobalt manganate electrode material, its coulombic efficiency is increased to 99.9%, the cycle retention rate is 99.6%, and the capacity is 170mAhg after 400 cycles. -1 .

example 2

[0031] In this example, a mixed sample of organic solvent xylene and ethylene glycol methyl ether is configured as a carbon source in a ratio of 1:3, and the others are the same as in Example 1. The obtained nickel cobalt manganese lithium / carbon composite material is made into a battery. The test found that after 500 cycles, the capacity retention rate and coulombic efficiency are 99.6%, and the capacity is 180mAhg. -1 Compared with Example 1, it can be seen that when different organic solvents are used to mix the carbon source, the overall crystal structure stability of the material can be further improved. During the process of deintercalating lithium ions, the structure of the carbon layer is maintained not to collapse and the internal The structure of the active material is complete, so as to ensure that the composite material has good electrochemical performance and make its performance better.

example 3

[0033] A mixed sample of organic solvent xylene and ethylene glycol methyl ether is configured as a carbon source in a ratio of 1:3. After dehydration treatment, it is placed in an evaporation zone to form a mixed gas at a temperature of 50-100°C. The mixed gas enters the vacuum carbonization chamber (that is, the above-mentioned carbon coating zone). The nickel-cobalt-manganese lithium material for carbon recombination is selected from the ternary NCM111 and placed in the carbonization chamber. The carbonization deposition temperature is 1200-1400°C. The thickness of the deposited carbon layer is 8-10nm after 9-10h of deposition. Then the obtained nickel cobalt manganese lithium / carbon composite material was made into a battery for testing. It was found that the capacity retention rate and coulombic efficiency were 99.9% after 500 cycles, the cycle retention rate was 99.7%, and the capacity remained 180mAhg after 500 cycles. -1 . But the deposition takes longer.

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Abstract

A modified lithium nickel cobalt manganate electrode material and a preparation method thereof are provided. Lithium nickel cobalt manganate purchased on the market is coated with carbon by chemical deposition, that is, a carbon-coated zone is formed by evaporation of a volatile organic carbon source at a certain temperature, then lithium nickel cobalt manganate is placed in the carbon-coated zoneso as to be tightly combined with organic carbon source vapor, and then subjected to high-temperature carbonization treatment for 0.5-10 hours, so that the carbon layer is tightly combined with the lithium nickel cobalt manganate to prepare the modified lithium nickel cobalt manganate electrode material. The preparation method is simple in operation and safe and controllable in operation process.The prepared modified lithium nickel cobalt manganate electrode material not only has higher energy density and specific capacity and lower production cost, but also has good cycle performance and rate performance, and the safety performance is better than that of pure lithium nickel cobalt manganate.

Description

Technical field [0001] The invention relates to a lithium nickel cobalt manganate electrode, in particular to a method for preparing a modified lithium nickel cobalt manganate electrode material. Background technique [0002] Compared with traditional electrode materials, lithium nickel cobalt manganese oxide ternary cathode material has the advantages of higher charge-discharge specific capacity, good cycle performance, high energy density, good thermal stability, and low cost, and lithium nickel cobalt manganese oxide The materials can be adjusted according to the ratio of nickel, cobalt, and manganese. Materials with different ratios have the advantages of different properties, and the current prospects for use are huge. [0003] However, in pursuit of higher energy density and specific capacity and lower production costs, the content of nickel metal is gradually increased. However, with the increase of nickel content, the cycle performance, thermal stability and safety performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 刘建江海杨俭
Owner 成都宏焘新材料有限公司
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