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Positive electrode material, positive electrode sheet containing same and lithium ion battery

A technology of positive electrode material and positive electrode sheet, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of gas generation, particle surface damage, and battery life damage, and achieves improved safety performance and cycle life. Ease of control of conditions and improved safety performance

Active Publication Date: 2019-11-15
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With its high discharge voltage platform and high energy density, it has always occupied a dominant position in the positive electrode active material of consumer lithium-ion batteries, but lithium cobalt oxide also has some obvious disadvantages, such as phase change and structural change at high voltage. The collapse leads to poor rate performance, and the contact reaction with the electrolyte leads to particle surface damage and gas generation, which in turn affects the safety performance of the battery and destroys the service life of the battery

Method used

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  • Positive electrode material, positive electrode sheet containing same and lithium ion battery
  • Positive electrode material, positive electrode sheet containing same and lithium ion battery
  • Positive electrode material, positive electrode sheet containing same and lithium ion battery

Examples

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preparation example Construction

[0037] According to a second aspect of the present application, a method for preparing a positive electrode material with a coating layer is provided, the method comprising the following steps:

[0038] (1) Covered ball milling of positive electrode materials:

[0039] Grinding the active material and cobalt-containing compound (at least one of CoN, CoP, CoS and CoB) in a roller mill tank, and controlling the ratio of the two contents to obtain a positive electrode material precursor;

[0040] (2) Preparation of cladding material by high temperature sintering:

[0041] The composite cathode material precursor obtained in (1) is placed in an inert atmosphere or an air atmosphere for sintering at 400° C. to 800° C., and the obtained powder is ground to obtain the desired cathode material.

[0042] In some embodiments, in step (1), the surface coating material used for the positive electrode material is at least one of cobalt nitride, cobalt phosphide, cobalt sulfide and cobalt ...

Embodiment 1

[0059] (1) Covered ball milling of positive electrode materials:

[0060] Lithium cobalt oxide (LiCoO 2 ), CoP (as a cobalt-containing compound) is ground in a roller mill tank, and the ratio of the content of the two is controlled so that the mass ratio of CoP in the positive electrode material is 0.1% (that is, the coating amount of CoP is controlled to be 0.1% %), obtain the positive electrode material precursor;

[0061] (2) Preparation of cladding material by high temperature sintering:

[0062] The positive electrode material precursor prepared in step (1) is placed in an inert atmosphere and sintered at 600° C., and the obtained powder is ground to obtain the desired positive electrode material. Wherein the prepared positive electrode material includes lithium cobalt oxide as an active material and a coating layer containing CoP coated on the surface of lithium cobalt oxide. Among them, lithium cobalt oxide and CoP form a heterostructure material layer, and the heter...

Embodiment 2

[0069] The preparation methods of the positive electrode sheet, the negative electrode sheet, the electrolyte, the separator, and the lithium-ion battery are the same as in Example 1, except that the coating amount of CoP is controlled to be 0.5%.

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Abstract

The invention relates to a positive electrode material, a positive electrode sheet containing the positive electrode material, and a lithium ion battery. The positive electrode material comprises an active material and a coating layer coating the surface of the active material. The coating layer comprises a compound containing cobalt. A heterostructure material layer exists between the coating layer and the active material layer. The heterostructure material contains one or more elements of Li, Co, O, or M, wherein M includes at least one of N, P, S, or B. The invention further provides the lithium ion battery. According to the positive electrode material of the battery, a certain amount of cobalt-containing compound with embeddable lithium ions coats the surface of the particles of the active material to form a coating material with a stable surface structure; the surface stability of the particles of the active material can be effectively improved; and the safety performance of the battery is improved.

Description

technical field [0001] The application relates to a positive electrode material, a positive electrode sheet containing the positive electrode material and a lithium ion battery. Background technique [0002] With the development of human society and scientific and technological progress, people are increasingly dependent on energy. The non-renewability of fossil fuels has led to higher energy prices and tensions in the global energy situation. The resources brought about by traditional energy utilization methods Issues such as shortages, environmental pollution, and the greenhouse effect have become increasingly prominent. These issues continue to threaten human health and life. Improving the energy structure and developing efficient and clean new energy sources have become a global consensus. [0003] Lithium-ion battery, as the most widely used electrochemical energy storage device at present, is widely used in small digital products such as mobile phones due to its advant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 陈鹏伟王梦徐磊敏王亮
Owner NINGDE AMPEREX TECH
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