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Coating agent for coating high-nickel ternary positive electrode material, high-nickel ternary positive electrode material, preparation method and lithium ion battery

A technology of cathode material and coating agent, which is applied in the field of high-nickel ternary cathode materials and can solve problems such as poor coating effect of coating agent

Active Publication Date: 2021-09-07
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problem that the coating effect of the coating agent of the current high-nickel ternary positive electrode material is not good, and the improvement of the performance of the high-nickel ternary positive electrode material is limited, the purpose of the present invention is to provide a method for coating the high-nickel ternary positive electrode material. Coating agent to form an effective coating on high-nickel ternary cathode materials and improve the cycle performance of batteries made of high-nickel ternary cathode materials

Method used

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  • Coating agent for coating high-nickel ternary positive electrode material, high-nickel ternary positive electrode material, preparation method and lithium ion battery
  • Coating agent for coating high-nickel ternary positive electrode material, high-nickel ternary positive electrode material, preparation method and lithium ion battery
  • Coating agent for coating high-nickel ternary positive electrode material, high-nickel ternary positive electrode material, preparation method and lithium ion battery

Examples

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Effect test

Embodiment 1

[0028] A coating agent for coating high-nickel ternary positive electrode materials, the coating agent is nano spinel lithium titanate, the particle size of spinel lithium titanate is 1-100nm, more preferably Diameter is 10~90nm, is 80nm with respect to the average particle diameter among the present embodiment, and SEM figure sees figure 1 shown.

Embodiment 2

[0030] A high-nickel ternary positive electrode material prepared by coating nano spinel lithium titanate, the average particle size of nano spinel lithium titanate is 80nm, the specific preparation process is as follows:

[0031] (1) The high-nickel ternary cathode material Li(Ni 0.7 co 0.1 mn 0.2 )O 2 Mix it with nano-spinel lithium titanate, turn it at 300rpm for 1min, then turn it at 2000rpm for 10min to make a mixture evenly, and the mass addition amount of nano-spinel lithium titanate is 0.5wt% of the high-nickel ternary positive electrode material;

[0032] (2) Sinter the mixture in an oxygen-enriched tube furnace at 500°C for 8 hours to prepare a spinel-type lithium titanate-coated high-nickel ternary cathode material, in which the volume ratio of oxygen in the tube furnace atmosphere 50%.

[0033] The SEM scanning electron microscope picture of gained high-nickel ternary cathode material is shown in figure 2 and image 3 As shown, it can be seen from the figure...

Embodiment 3

[0035] A high-nickel ternary positive electrode material prepared by coating with nano-spinel lithium titanate, the difference from Example 2 is that the mass addition of nano-spinel lithium titanate in step (1) is 1wt% of high nickel ternary cathode material.

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Abstract

The invention relates to the technical field of high-nickel ternary positive electrode materials, and discloses a coating agent for coating a high-nickel ternary positive electrode material in allusion to the problems that the coating effect of the coating agent of the existing high-nickel ternary positive electrode material is poor and the improvement of the performance of the high-nickel ternary positive electrode material is limited. The coating agent is nano spinel lithium titanate. Commercial nano spinel type Li4Ti5O12 is selected as a coating agent of the ternary material, the coating agent can be better compatible with the ternary material due to the Li element, and firmer chemical bonds are formed, so that the coating agent can be easily adsorbed on the surface of the micron-sized ternary material, the coated ternary material is complete in morphology and uniform in coating, and then the rate, the cycle performance and the stability of the ternary material are improved.

Description

technical field [0001] The invention relates to the technical field of high-nickel ternary positive electrode materials, in particular to a coating agent for coating high-nickel ternary positive electrode materials, a high-nickel ternary positive electrode material, a preparation method and a lithium ion battery. Background technique [0002] Layered high-nickel ternary lithium-ion battery cathode material LiNi l-x-y co x mn y o 2 With high energy density, it is one of the most promising cathode materials at present. The redox reaction in the battery occurs at the electrode / electrolyte interface. The surface of the high-nickel ternary material after delithiation is very unstable. Too high nickel content and too low cobalt content seriously affect the cycle performance and rate performance of the battery. and thermal stability. In order to improve the comprehensive performance of high-nickel ternary cathode materials, researchers have done a lot of research on doping and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/628H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00H01M2004/028H01M2004/021Y02E60/10
Inventor 肖彪彪陈瑶许梦清
Owner WANXIANG 123 CO LTD