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A kind of preparation method of nickel-doped lithium cobalt oxide composite cathode material with core-shell structure

A technology of nickel-doped lithium cobalt oxide and composite cathode material, applied in structural parts, battery electrodes, electrical components, etc., can solve problems such as anode structure collapse and side reactions, achieve long service life, improve energy density, and improve electrical conductivity effect on performance and electrochemical stability

Active Publication Date: 2017-02-22
广州鸿森材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in lithium secondary batteries, there is a problem that during charge / discharge, side reactions occur within the battery due to the decomposition of non-aqueous electrolyte solutions, especially carbonate organic solvents, which serve as electrolytes on the electrode surfaces
In addition, when electrolyte solvents with large molecular weight such as ethylene carbonate (EC), propylene carbonate (PC), etc. are co-intercalated between the graphite layers of carbon-based anodes, the structure of the anode may collapse.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The active material of this embodiment is LiCo 0.55 Ni 0.45 o 2 .

[0018] Mix lithium oxalate, cobalt hydroxide and nickel hydroxide in proportion, wherein the molar ratio of Li: Co: Ni is 1.02: 0.55: 0.45, mix and grind the mixture evenly and put it into a heating furnace. The heat treatment atmosphere is air, and the heating rate is 5°C / min, pretreatment at 550°C, pretreatment time is 4h, then heated to 850°C, heat treatment time is 6h, then lowered to room temperature, and the synthetic material is crushed and sieved to obtain a particle size of 10-20μm Nickel doped lithium cobalt oxide.

[0019] 0.2 parts by weight of polyethylene glycol methyl ether are dissolved in 100 parts by weight of acetone to obtain a solution of polyethylene glycol methyl ether, and are added to the solution in an amount of 5 parts by weight relative to every 100 parts by weight of the solution Si / graphite composite particles with a diameter of 50-100nm are ultrasonically dispersed to ...

Embodiment 2

[0022] The active material of this embodiment is LiCo 0.45 Ni 0.55 o 2 .

[0023] Mix lithium oxalate, cobalt hydroxide and nickel hydroxide in proportion, wherein the molar ratio of Li: Co: Ni is 1.02: 0.45: 0.55, mix and grind the mixture evenly and put it into a heating furnace. The heat treatment atmosphere is air, and the heating rate is 10°C / min, to 650°C for pretreatment, pretreatment time is 2h, then heated up to 900°C, heat treatment time is 4h, then lowered to room temperature, and the synthetic material is crushed and sieved to obtain a particle size of 10-20μm Nickel doped lithium cobalt oxide.

[0024] 0.3 parts by weight of polyethylene glycol methyl ether are dissolved in 100 parts by weight of acetone to obtain a solution of polyethylene glycol methyl ether, and an amount of 8 parts by weight per 100 parts by weight of the solution is added to the solution Si / graphite composite particles with a diameter of 50-100nm are ultrasonically dispersed to obtain a c...

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Abstract

The invention relates to a method for preparing a nickel-doped lithium cobalt oxide composite positive electrode material with a core-shell structure. The method includes the following steps: (1) preparation of nickel-doped lithium cobalt oxide, (2) preparation of a coating material, ( 3) Coating forms a core-shell structure. The positive electrode material prepared by the present invention adopts high-nickel-doped lithium cobaltate material as the active material to increase the energy density of the material, and adopts organic polymer and Si / graphite as the coating material to improve the conductivity and electrical conductivity of the material. chemical stability. Therefore, the composite material has high specific capacity and long service life when used in lithium-ion batteries.

Description

technical field [0001] The invention relates to a preparation method of a nickel-doped lithium cobalt oxide composite positive electrode material with a core-shell structure. Background technique [0002] There is an increasing interest in energy storage technologies. Electrochemical devices have been widely used as energy sources for cellular phones, camcorders, notebook computers, PCs, and electric vehicles, resulting in intensive research and development. In this regard, electrochemical devices are a crucial subject. In particular, the development of rechargeable secondary batteries has been the focus of attention. In addition, during the development of such batteries, research has recently been conducted on novel electrodes and designs of novel batteries, leading to improved capacity density and specific energy. [0003] Lithium-ion secondary batteries have the characteristics of high energy density, light weight, no pollution to the environment, no memory effect, sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/525
CPCH01M4/139H01M4/525H01M4/62H01M4/624H01M4/625Y02E60/10
Inventor 刘振添金婷孙斌王英洪魁明郑锐荣黄春生邵丽霞莫火烙谢芳清
Owner 广州鸿森材料有限公司