Surface decorated lithium ion cell positive electrode material and its preparing method

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of surface modified lithium ion battery positive electrode materials and their preparation, can solve the problem of complex changes in manganese valence state changes in the structure of lithium manganese oxides, and it is difficult to master the preparation conditions, charge and discharge conditions, and discharge capacity. low problems, to achieve the effect of easy large-scale industrial production, short preparation cycle and high energy density

Inactive Publication Date: 2005-05-18
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the common inhomogeneous reaction, the valence state change of manganese and the structure change of lithium manganese oxide are more complex, so it is not easy to master the preparation conditions and charge and discharge conditions, which often leads to a lower discharge capacity or an increase in capacity with the number of cycles. and gradually decay

Method used

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Examples

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Effect test

Embodiment 1

[0027] A kind of surface modification lithium ion battery cathode material and preparation method thereof: 100g lithium battery cathode powder LiCo 0.1 mn 1.9 o 4 Put in 50mL, 0.05mol / l soluble starch aqueous solution, put this mixture in a hydrothermal reactor with stirring, after 4.0 hours, 200 ℃ hydrothermal reaction, and then spray dry the reacted solution, then the coating can be obtained Positive electrode powder material LiCo with uniform carbon microspheres 0.1 mn 1.9 o 4 . The resulting lithium-ion battery cathode material LiCo coated with carbon microspheres 0.1 mn 1.9 o 4 It is a dark brown powder, and the specific capacity of the product is higher than that of uncoated LiCo 0.1 mn 1.9 o 4 5% higher capacity fade rate than uncoated LiCo 0.1 mn 1.9 o 4 5 times lower, the capacity is 94.0% of the initial capacity after 30 charge-discharge cycles.

Embodiment 2

[0029] A method for surface modification of lithium ion battery cathode material: 100g of lithium battery cathode powder LiCo 0.1 mn 1.9 o 4 Put it in 100mL, 2.0mol / l sucrose aqueous solution, put this mixture in a stirred hydrothermal reactor, after 0.5 hours, 180°C hydrothermal reaction, and then spray dry the reacted solution, you can get coated with Positive electrode powder material LiCo with uniform carbon microspheres 0.1 mn 1.9 o 4 . The resulting lithium-ion battery cathode material LiCo coated with carbon microspheres 0.1 mn 1.9 o 4 It is a black powder, and the specific capacity of the product is higher than that of uncoated LiCo 0.1 mn 1.9 o 4 3% higher than that of uncoated LiCo 0.1 mn 1.9 o 4 6 times lower, the capacity is 95.0% of the initial capacity after 30 charge and discharge cycles.

Embodiment 3

[0031] A method for surface modification of lithium ion battery positive electrode materials: 100g lithium battery positive electrode powder LiCoO 2 Put in 1000mL, 2.0mol / l glucose aqueous solution, put this mixture in a stirred hydrothermal reactor, after 1.0 hour, 200 ℃ hydrothermal reaction, and then spray dry the reacted solution, you can get coated with Positive electrode powder material LiCoO with uniform carbon microspheres 2 . The resulting lithium-ion battery cathode material LiCoO coated with carbon microspheres 2 It is a black powder, and the specific capacity of the product is higher than that of uncoated LiCoO 2 1% higher than that of uncoated LiCoO 2 5 times lower, the capacity is 99.0% of the initial capacity after 30 charge-discharge cycles.

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Abstract

This invention relates to a material for decorating surface of the positive of Li ionic battery and its preparation method, first of all, putting a positive powder material Li-M1M2-O(M1M2=Co Mn Ni Cr into a solution with organic substance in the concentration of 0.05-2.00mol/1 then to put the mixed substance into a heat water reactor with mixing for 0.1-4h under 150-200deg. to spray and dry the reacted solution, then a positive material is got covered uniform carbon microspheres having the advantage of high specific capacity, fine circulation performance, uniform porosity and no impurities.

Description

technical field [0001] The invention relates to a surface-modified lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery refers to Li + A secondary battery in which the insertion compound is the positive and negative electrodes. Layered and spinel-type lithium transition metal oxides are considered to be preferred cathode materials for high-energy-density lithium-ion batteries. [0003] The current research focus is on Li-M 1 m 2 -O(M 1 , M 2 = Co, Mn, Ni, Cr) system positive electrode materials, especially spinel phase Li 2 mn 2 o 4 , whose structure has a three-dimensional network tunnel composed of coplanar tetrahedrons and octahedrons, the structure is stable and favorable for Li + migrate. Li at room temperature + Diffusion coefficient > 10 -9 cm 2 / s level, conductivity > 10 -6 δ / cm, which can be coupled with carbon electrodes to form a high energy density lithium-ion battery. It ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01G1/02H01M4/02H01M4/04H01M4/36H01M4/50H01M4/52H01M10/36
CPCC01G45/1221C01G51/42C01G51/44C01G53/42C01G53/44C01P2002/52C01P2006/40H01M4/1391H01M4/1393H01M4/366H01M4/505H01M4/525H01M4/587H01M10/0525Y02E60/10
Inventor 贾永忠韩金铎周园景燕陈元涛金山
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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