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Carbon-coated ternary material and preparation method thereof

A ternary material and carbon-coated technology, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of difficult operation and tediousness, and achieve the effects of reducing dissolution, good electronic conductivity, and reducing corrosion

Active Publication Date: 2018-06-22
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the third route, the method of preparing porous carbon and then filling the carbon voids with ternary materials is cumbersome and difficult to operate.

Method used

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  • Carbon-coated ternary material and preparation method thereof
  • Carbon-coated ternary material and preparation method thereof
  • Carbon-coated ternary material and preparation method thereof

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preparation example Construction

[0035] The embodiment of the present invention proposes a carbon-coated ternary material preparation method, including:

[0036] adding the ternary material into the ball milling equipment, the ball milling equipment includes ball milling beads, the inner wall of the ball milling equipment and / or the ball milling beads are attached with carbon material, 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 0.2-2% by weight of carbon material.

[0038] In this embodiment, a certain mass of ternary positive electrode material is put into a ball mill that has just milled carbon materials, and the ball mill is turned on at the second rotational speed. After the second time of ball milling, a small amount of carbon material can be obtained at this time. Ternary material. The general formula of the above-mentioned ternary cathode material ...

Embodiment 1

[0053] Step 1. Put 5g of artificial graphite 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 can be 5mm or 1mm. The mass ratio of ball milling beads of different particle sizes is 1:1, and the ball-material ratio is controlled at: 10:1. At the ball mill speed of 400 rpm, ball milling for 15 minutes, so that the surface of the ball milling beads and the inner surface of the ball milling equipment are adhered to one another. layer carbon material, and separate the remaining carbon material powder and ball milling beads by sieving, and then pour the ball milling beads back into the ball milling tank for use in the next process.

[0054] 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 for ball milling the carbon ...

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Abstract

The invention proposes a carbon-coated ternary material and a preparation method thereof. A ternary material and a carbon material are combined by a mode of ball-milling for many times to form the carbon-coated ternary material. By the carbon-coated ternary material, the thermal processing process under low-oxygen pressure division atmosphere is prevented, the ternary material is prevented from being partially reduced, and damage to electrochemical performance is prevented. The carbon-coated ternary material prepared by the method has favorable electronic conductivity, direct contact between apositive electrode material and an electrolyte can be prevented by carbon coating, the dissolution of transition metal ions is reduced, the oxidization of the positive electrode material on the electrolyte under a charging state is reduced, the corrosion of hydrofluoric acid generated by decomposition of a lithium salt in the electrolyte to a positive electrode is reduced, and the rate performance, the cycle property and the high-temperature storage performance of the positive electrode material are improved.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a carbon-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 of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈巍欧阳云鹏李鲲张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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