Method for modifying phosphorus-containing compound on surface of high-nickel ternary material and lithium ion battery

A high-nickel ternary material and modification method technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reduced electrochemical performance, lithium deficiency of high-nickel materials, and dissolution of metal elements, so as to improve capacity performance, The effect of reducing the residual alkali content on the surface and improving the surface properties

Inactive Publication Date: 2021-10-22
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, wet coating often requires multi-step processes to eliminate or recycle solvents to control the preparation cost. The overall process is relatively complicated and the cost is high; and acidic phosphorus-containing solutions are selected as wet coating reagents, and metal elements in ternary materials are leached out. risks of
The long-term aqueous phase wet stirring process may destroy the surface structure of the material and lead to lithium deficiency in high-nickel materials, and the electrochemical performance of the material will decrease.

Method used

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  • Method for modifying phosphorus-containing compound on surface of high-nickel ternary material and lithium ion battery
  • Method for modifying phosphorus-containing compound on surface of high-nickel ternary material and lithium ion battery
  • Method for modifying phosphorus-containing compound on surface of high-nickel ternary material and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1kg LiNi 0.96 co y mn z o 2 The material and potassium dihydrogen phosphate are ball milled and mixed by a planetary ball mill; the added content of phosphorus is 3.1*10^-4ppm, and the two materials are mixed in a 300rpm ball mill for 3 hours; the sagger containing the mixed material is placed in oxygen The flux is sintered in a heat treatment furnace of 10L / min; the heating rate of the furnace body is 2°C / min, and the temperature is kept at a high temperature of 600°C for 12h.

Embodiment 2

[0048] 1kg LiNi 0.96 co y mn z o 2 The material and ammonium dihydrogen phosphate are ball milled and mixed by a planetary ball mill; the added content of phosphorus is 1.24*10^-3ppm, and the two materials are mixed in a 300rpm ball mill for 3 hours; the sagger containing the mixed material is placed in oxygen The flux is sintered in a heat treatment furnace of 12L / min; the heating rate of the furnace body is 2°C / min, and the temperature is kept at a high temperature of 600°C for 10h.

[0049] Reference sample 1

[0050] High nickel ternary material LiNi with high surface residual alkali 0.96 co y mn z o 2 .

[0051] Reference sample 2

[0052] 1kg LiNi 0.96 co y mn z o 2 The material and potassium dihydrogen phosphate are ball milled and mixed by a planetary ball mill; the added content of phosphorus is 3.1*10^-4ppm, and the two materials are mixed in a 300rpm ball mill for 3 hours; the sagger containing the mixed material is placed in oxygen The flux is sintere...

Embodiment 3

[0054] 3kg LiNi 0.96 co y mn z o 2 The material and aluminum dihydrogen phosphate are mechanically mixed by a high-speed mixer at a speed of 1000rpm for 25 minutes; the phosphorus content accounts for 4.65*10^-4ppm; the sagger with the mixed material is placed in a heat treatment furnace with an oxygen flux of 10L / min During the sintering process, the oxygen content inside the furnace cavity is above 92%; the heating rate of the furnace body is 2°C / min, and the temperature is kept at a high temperature of 480°C for 12h; naturally cooled to room temperature.

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Abstract

The invention provides a method for modifying a phosphorus-containing compound on the surface of a high-nickel ternary material, which comprises the following steps of mechanically mixing the high-nickel ternary material and a modifier to obtain a mixed material, and carrying out heat treatment on the mixed material in an oxygen atmosphere. According to the method, surface modification of the high-nickel ternary material is completed on the premise that wet mixing is not adopted; and the surface modification of the high-nickel material and the improvement of the electrochemical performance are realized by selecting a proper modification material and a proper heat treatment temperature. The selected preparation method is simple and controllable, and existing equipment can be used for preparation.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for modifying a phosphorus-containing compound on the surface of a high-nickel ternary material and a lithium-ion battery. Background technique [0002] Clean, renewable energy is a major development trend in today's society. With the increase of energy demand, high energy density lithium ion battery is the main development direction of lithium battery at present. Based on this, the ternary cathode material has gradually developed from the original NCM111 to high nickel (NCM811) and higher nickel (Ni content>90%). [0003] Compared with low-nickel ternary materials, high-nickelized materials will not only increase the residual alkali content on the surface of the material, affect the gram capacity of the material and cause side reactions during the charging process of the material, but at the same time, the high activity of the surface will make the mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 林哲琪马娇黄晓笑于建孙辉
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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