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Modified lithium-cobalt oxide used for positive pole of lithium ion cell, its prepn and lithium ion cell

A lithium cobalt oxide, lithium ion battery technology, applied in lithium compounds, battery electrodes, chemical instruments and methods, etc., can solve the problems of decreased yield, unfavorable charging potential of lithium ion batteries, complicated preparation by hydrothermal oxidation, etc.

Inactive Publication Date: 2004-04-28
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high calcination temperature will lead to LiCoO 2 The yield decreases, and the low calcination temperature is not conducive to the charging potential of the prepared lithium-ion battery. Therefore, some researchers have proposed a hydrothermal oxidation method at a lower temperature of about 160-300 ° C. Preparation of Layered Rock Salt LiCoO 2 , such as U.S. Patent No. 6,399,041 B1
However, the preparation of this hydrothermal oxidation method is more complicated

Method used

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  • Modified lithium-cobalt oxide used for positive pole of lithium ion cell, its prepn and lithium ion cell
  • Modified lithium-cobalt oxide used for positive pole of lithium ion cell, its prepn and lithium ion cell
  • Modified lithium-cobalt oxide used for positive pole of lithium ion cell, its prepn and lithium ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: LiCoO 2 -ZrO 2

[0023] LiCoO with a particle size distribution of 90% particle size less than 17 microns 2 1.9 g of pellets were impregnated with 0.1 g of ZrO(NO 3 ) 2 .xH 2 O (molecular weight 231.23, ALDRICH, USA, code number 34646-2) in 20 ml of aqueous solution, the resulting mixture was dried at 110°C, and the obtained dry mixture was calcined at 600°C for 3 hours. The calcined product can be used as the positive electrode material of the lithium ion battery after grinding.

[0024] figure 1 Shown is LiCoO before modification 2 SEM photographs of the particles, while figure 2 is its EDS spectrum. from figure 1 It can be seen that LiCoO 2 The surface of the particles is quite smooth, while figure 2 Then peaks of oxygen and Co are displayed.

[0025] Modified LiCoO 2 The SEM photographs are shown in image 3 , from which it can be seen that LiCoO 2 The particles have substances attached to their surfaces. Figure 4 For the modified LiCo...

Embodiment 2

[0026] Example 2: LiCoO 2 -B 2 o 3

[0027] In addition to 0.1 g of boric acid (H 3 BO 3 , molecular weight 61.83) powder (ALDRICH, the United States, code 23646-2) to replace 0.1 g of ZrO (NO 3 ) 2 .xH 2 O outside, repeat the step of embodiment 1.

[0028] Using Examples 1-2 and commercial LiCoO 2 (Nippon chemical Industrial Co., Japan, code-named CELLSEED C), making the positive electrode, using lithium metal as the negative electrode, and 1M LiPF with a mixed solvent of EC (ethylene carbonate) and DEC (diethyl carbonate) 6 The solution was used as an electrolyte to assemble a 2030-Type button half-cell. Tested at a charge and discharge rate of 0.2C (current density 28mA / g). When commodity LiCoO 2 When the battery with the material as the positive electrode is charged and discharged at a high potential (3-4.4V), although the charge-discharge at a lower potential (3-4.2V) can increase the battery life by about 20%, it is found that the long-term cycle test is as fo...

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Abstract

This invention relates to LiCoO2 of laminated halite alpha=NaFeO2 structure, especially to a modified LiCoO2 When it is used as the positive of a Li ionic battery, its charging potential can be increased to 4.4v. The said modified oxide includes LiCoO2 particles and ZrO2, TiO2, B2O3, Al2O3 or Ga2O3 adhered on the surface of the particles and is prepared by dipping the particles in a solution containing Zr, Ti, B, Al or Ga ions and burring the dipped particles.

Description

technical field [0001] The present invention relates to a kind of layered rock salt type (α-NaFeO 2 type) structure lithium cobalt oxide (LiCoO 2 ); especially related to a modified lithium cobalt oxide having a charging potential of about 4.4V when it is used as the positive electrode of a lithium ion battery. Background technique [0002] Due to their excellent energy density, rechargeable lithium-ion batteries have been widely used as rechargeable energy sources for portable electronic devices such as mobile phones and notebook computers. [0003] Most of the current lithium-ion batteries use layered rock salt type (α-NaFeO 2 type) structure of LiCoO 2 As the positive electrode, a carbon material such as graphite as the negative electrode, and an organic solution containing Li salt as the electrolyte. The LiCoO 2 It is generally prepared by calcining a mixture containing cobalt oxide and lithium carbonate at 700-900°C. Use this α-NaFeO 2 typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M4/02H01M4/48H01M4/52H01M4/58H01M10/36
CPCY02E60/122H01M2004/028H01M4/525H01M10/0525H01M4/1391H01M4/131Y02E60/10
Inventor 李日琪林俊仁许哲源
Owner IND TECH RES INST
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