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Metal fluoride coated ternary material and preparation method thereof

A ternary material and fluoride technology, applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, can solve problems such as insufficient coating uniformity, and achieve simple and efficient preparation methods. Low anti-corrosion requirements, improved cycle performance and storage performance

Active Publication Date: 2021-08-31
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, there are certain defects in these treatment processes, such as the possibility of generating strong corrosive HF gas, or the use of fluorine-containing reagents that are easily decomposed to produce hydrogen fluoride, or the uniformity of the coating is not good enough

Method used

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  • Metal fluoride coated ternary material and preparation method thereof
  • Metal fluoride coated ternary material and preparation method thereof
  • Metal fluoride coated ternary material and preparation method thereof

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preparation example Construction

[0035] The embodiment of the present invention proposes a method for preparing a metal fluoride-coated ternary material, including:

[0036] adding the ternary material into the ball milling equipment, the ball milling equipment including ball milling beads, the inner wall of the ball milling equipment and / or the ball milling beads are attached with metal fluoride, the ball milling is performed at a second rotational speed, and the milling time is the second time length;

[0037] The above operation is repeated many times, so that the ternary material contains 0.1-0.5% by weight of metal fluoride.

[0038] In this embodiment, a certain quality of ternary cathode material is put into a ball milling equipment that has ball-milled metal fluoride, and the ball mill is turned on at the second rotation speed. After the second time of ball milling, a small amount of metal fluoride coating can be obtained. ternary material. The general formula of the above-mentioned ternary cathode m...

Embodiment 1

[0054] Step 1. Put 18g of aluminum fluoride into the ball milling equipment. For example, QM3-SP4 planetary ball mill can be used. The lining of the ball mill is made of ceramic material for metal isolation treatment, and ball milling beads made of zirconia are used. The ball milling beads are 5mm and 1mm Two particle sizes, the mass ratio of ball milling beads for large and small particle sizes is 1:1, and the ball-to-material ratio is controlled at 10:1. At the ball mill speed of 600 rpm, ball milling for 25 minutes, so that the surface of the ball milling beads and the inner surface of the ball milling equipment adhere to a Layer metal fluoride, and separate the remaining metal fluoride powder and ball milling beads by sieving. After separation, the ball milling beads are returned to the ball milling tank for use in the next process.

[0055] Step 2, add a certain mass of ternary cathode material (LiNi 0.84 co 0.1 mn 0.06 o 2 ) into the ball milling equipment that ball m...

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Abstract

The invention proposes a metal fluoride-coated ternary material and a preparation method thereof. The ternary material is combined with a metal fluoride by multiple ball milling to form a metal fluoride-coated ternary material. The invention avoids the use of a wet process for fluoride coating, does not need to use a fluoride precipitant, does not cause corrosion to positive electrode materials, and has relatively low requirements for equipment corrosion protection. By adopting the preparation method of the metal fluoride-coated ternary material of the present invention, the coating of the ternary positive electrode material with nanoscale metal fluoride particles can be realized. The preparation method is simple, efficient, operable and suitable for large-scale industrial production. The obtained metal fluoride-coated ternary material improves the cycle performance and storage performance of the cathode material.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a metal fluoride-coated ternary material and a preparation method thereof. Background technique [0002] Lithium-ion power batteries are the core components of new energy vehicles, and their performance is directly related to the smooth promotion of new energy vehicles and the future of the new energy vehicle industry. The vast new energy vehicle market can also drive the vigorous development of the lithium-ion battery industry. [0003] Cathode material is an important part of lithium-ion batteries, and its performance is crucial to the performance of lithium-ion batteries. Among various positive electrode materials, ternary positive electrode materials have become the preferred positive electrode materials for lithium-ion power batteries for new energy vehicles (especially passenger vehicles) due to their high energy density, and have also become the development focus ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 陈巍欧阳云鹏李鲲张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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