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Lithium-rich cathode material and preparation method and application thereof

A lithium-rich positive electrode material and lithium-rich technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of complex process, regulation, and distribution of difficult elements in the synthesis of gradient structures

Active Publication Date: 2015-12-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] After nearly 30 years of development, cathode materials have formed a variety of synthesis methods including solid-phase method, co-precipitation method, sol-gel method, hydrothermal method and template method. Among them, the solid-phase method is difficult to control the distribution of elements in the material. The template method is mainly used to synthesize positive electrode materials with special morphology, and the process of synthesizing gradient structures by sol-gel method and hydrothermal method is too complicated

Method used

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  • Lithium-rich cathode material and preparation method and application thereof
  • Lithium-rich cathode material and preparation method and application thereof
  • Lithium-rich cathode material and preparation method and application thereof

Examples

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Embodiment 1

[0065] see figure 1 : a lithium-rich cathode material of the present invention, its general formula is expressed as:

[0066] wxya 2 MnO 3 ·yLiNi x1 mn y1 co (1-x1-y1) o 2 ·zLiNi x2 mn y2 co z2 Al x3 o 2 , where x=27 / 100, y=63 / 100, z=1 / 10, x1=1 / 3, y1=1 / 3, x2=1 / 2, y2=3 / 2, z2=0, x3= 0.

[0067] The lithium-rich positive electrode material includes a lithium-rich solid solution (core A) and a material with lithium ion conductivity (shell B). The material with lithium ion conductivity is coated on the surface of the lithium-rich solid solution to form a core-shell structure; it has lithium ion conductivity The material is a spinel structure material.

[0068] In the lithium-rich positive electrode material of this embodiment, the lithium-rich solid solution (ie, the core material) is granular, and the lithium-rich solid solution is a secondary particle formed by accumulating primary particles, and the particle size of the primary particle is about 0.1 μm to 0.3 μm. I...

Embodiment 2

[0098] A kind of lithium-rich cathode material of the present invention, its general formula is expressed as:

[0099] wxya 2 MnO 3 ·yLiNi x1 mn y1 co (1-x1-y1) o 2 ·zLiNi x2 mn y2 co z2 Al x3 o 2 , where x=27 / 100, y=63 / 100, z=1 / 10, x1=1 / 3, y1=1 / 3, x2=1 / 2, y2=3 / 2, z2=0, x3= 0.

[0100] The lithium-rich positive electrode material includes a lithium-rich solid solution (core A) and a material with lithium ion conductivity (shell B). The material with lithium ion conductivity is coated on the surface of the lithium-rich solid solution to form a core-shell structure; it has lithium ion conductivity The material is a spinel structure material.

[0101] In the lithium-rich positive electrode material of this example, the lithium-rich solid solution is a secondary particle formed by the accumulation of primary particles. The particle size of the primary particle is about 0.1 μm to 0.3 μm. In the range of 4μm ~ 6μm. Its chemical formula is Li 7 / 6 mn 1 / 2 Ni 1 / 6 co 1 / ...

Embodiment 3

[0122] A kind of lithium-rich cathode material of the present invention, its general formula is expressed as:

[0123] wxya 2 MnO 3 ·yLiNi x1 mn y1 co (1-x1-y1) o 2 ·zLiNi x2 mn y2 co z2 Al x3 o 2 , where x=27 / 100, y=63 / 100, z=1 / 10, x1=1 / 3, y1=1 / 3, x2=4 / 5, y2=0, z2=3 / 20, x3= 0.05.

[0124] The lithium-rich positive electrode material includes a lithium-rich solid solution (core A) and a material with lithium ion conductivity (shell B). The material with lithium ion conductivity is coated on the surface of the lithium-rich solid solution to form a core-shell structure; it has lithium ion conductivity The material is a layered ternary material.

[0125] In the lithium-rich positive electrode material of this example, the lithium-rich solid solution is a secondary particle formed by the accumulation of primary particles. The particle size of the primary particle is about 0.1 μm to 0.3 μm. In the range of 4μm ~ 6μm. Its chemical formula is Li 7 / 6 mn 1 / 2 Ni 1 / 6 co ...

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Abstract

The invention discloses a lithium-rich cathode material and a preparation method and an application thereof. The lithium-rich cathode material has a core-shell structure, and is composed of a core material lithium-rich solid solution and a shell material of one of layered ternary material and spinel structure material with lithium ionic conductivity; the preparation method I comprises the following steps: preparation of the core material, preparation of the core material coated with a shell material precursor, presintering treatment of a core-shell structure material and high-temperature sintering treatment; and the method II comprises the following steps: preparation of the core-material precursor, preparation of a gradient structure precursor material, presintering treatment of the core-shell structure material, and high-temperature sintering treatment. The preparation method disclosed by the invention has the advantages of being simple in technical process, nontoxic, harmless, simple in raw materials, few in byproducts, suitable for large-scale production and the like; the prepared lithium-rich cathode material has a gradient structure; the functional effect is materialized by the structure; the core has high capacity characteristic; the cycling stability of the material can be improved by the surface; and the lithium-rich cathode material can be widely applied to a lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-capacity lithium-rich positive electrode material with a functional core-shell structure, and also relates to a preparation method and application of the positive electrode material in lithium-ion batteries. Background technique [0002] With the development of society and the advancement of science and technology, lithium-ion batteries have been widely used as a new generation of energy systems. Lithium-ion batteries are used as power sources. Compared with traditional oil-based power sources, they have the advantages of high safety and no pollution, which makes lithium batteries have great application prospects in vehicle power supplies. At present, pure electric vehicles have been successfully produced at home and abroad and have been widely used. Sale. [0003] In 1990, Sony Corporation of Japan proposed to use LiCoO 2 As a lithium-ion secondary battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525H01M4/1391
CPCH01M4/1391H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 郑春满陈宇方谢凯王珲韩喻洪晓斌盘毅李德湛李宇杰许静
Owner NAT UNIV OF DEFENSE TECH
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