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Process for synthesizing lithium cobalt oxide as positive electrode material

A technology of lithium cobalt oxide and synthesis method, which is applied in the direction of battery electrodes, alkaline storage battery electrodes, electrical components, etc., can solve the problems of prolonging calcination time, large loss of first discharge capacity, and difficulty in industrial production, so as to improve cycle stability Effect

Inactive Publication Date: 2005-06-22
成都市雷雳高科技发展有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is the most common method for the synthesis of positive electrode materials. The synthesis process is simple, but due to the poor heat transfer of the solid phase reaction, the heat transfer and mass transfer speed are slow, which eventually leads to poor cycle stability of the positive electrode material, large loss of initial discharge capacity, and high charging capacity. The John-Teller effect is prone to occur during the discharge process
In order to overcome this shortcoming, the calcination process is usually complicated (such as secondary mixing during the calcination process, prolonging the calcination time, etc.)
Liquid-phase methods include sol-gel methods, although Co 2+ with Li + Reaching the molecular level is fully mixed, and can simplify the high-temperature solid-phase synthesis reaction, but because the precursor process is not passed, the obtained LiCoO 2 Low density and poor crystallinity lead to low specific capacity and poor cycle performance; at the same time, due to the processing of a large amount of solution, it is difficult to industrialize production, and its production cost is much higher than that of solid-phase method

Method used

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  • Process for synthesizing lithium cobalt oxide as positive electrode material
  • Process for synthesizing lithium cobalt oxide as positive electrode material
  • Process for synthesizing lithium cobalt oxide as positive electrode material

Examples

Experimental program
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Embodiment 1

[0024] Use 1.0mol / LCoSO 4 500ml and 1.0mol / L NaOH 1100ml solution are mixed and reacted at room temperature, and an appropriate amount of NaClO is added to generate Co(OH) 3 Precipitate, the precipitate is filtered, washed and dried at 100°C to 150°C to obtain Co(OH) 3 product. 50 g of this product was mixed with LiOH·H 2 O or Li 2 CO 3 Mix according to the molar ratio of Co:Li=1:1.1, add 150-180ml of acetone solution, and keep at room temperature for 2.0-4.0 hours, preferably 3.0-4.0 hours, under the action of stirring and impregnating, the system is in a sol-like state, and the Evaporate and dry at ~110°C, and the homogeneous mixture of lithium cobalt oxides formed is calcined at 850°C for 16 to 18 hours in a muffle furnace to synthesize LiCoO 2 Cathode material, the XRD pattern of this material is shown in figure 1 , the electrical performance test results are shown in Table 1 and figure 2 .

Embodiment 2

[0026] Use 1.0mol / LCoSO 4 500ml and 1.0mol / L NaOH 1100ml solution are mixed and reacted at room temperature to generate Co(OH) 2 Precipitate, filter and wash the precipitate and dry at 100°C to 150°C to obtain Co(OH) 2 Products, the particle size of which is controlled at 0.5-0.8 μm. This Co(OH) 2 Product 50 g and lithium source LiOH·H 2 O mixes, and ratio is with embodiment 1, and all the other processes are with embodiment 1. The test results of the electrical properties of the samples are shown in Table 1 and Figure 4 , the XRD pattern of this material is shown in image 3 .

Embodiment 3

[0028] Will make Co(OH) by embodiment 2 method 2 150g, calcined at 650°C-800°C for 2-6 hours to obtain Co 3 o 4 50g, with high purity (99.9%) Li 2 CO 3 Mix by Co: Li=1.0: 1.02~1.10 mol ratio, add 120~150ml of ethylene glycol aqueous solution of 10%, all the other steps are with embodiment 1, and sample electric performance test result is shown in Table 1 and Image 6 , the XRD pattern of this material is shown in Figure 5 .

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Abstract

A like sol-impregnation method (LSIM) for preparing LiCoO2 as the positive electrode material of secondary Li-ion bettery includes such steps as adding the hydroxide of Co3+ or CO2+ or Co2O4 and LiOH.H2O or Li2O3 to organic solvent (alcohol or ketone), water, or their mixture, stirring while impregnating to obtain sol-like state, evaporation drying at 80-110 deg.c, and calcining at 600-1000 deg.Cfor 6-20 hr. Its advantages are high initial discharge specific capacity up to 160 Ah / g and high cyclic stability.

Description

technical field [0001] The invention relates to a synthesis method of lithium cobalt oxide, a cathode material of a lithium ion secondary battery. Background technique [0002] As a new type of secondary battery, lithium-ion secondary battery has the characteristics of high specific capacity, high voltage and good safety. It is widely used in mobile phones, portable computers and other fields. It has a wide market and is expected to replace lead-acid, Various secondary batteries such as Ni-MH and Ni-Cd have become the main source of portable electrical appliances. [0003] The cathode material is a key part of the lithium-ion secondary battery, and the electrochemical performance and cycle performance of the battery are closely related to the cathode material. Lithium cobalt oxide (LiCoO 2 ) has become the most widely used and the largest amount of lithium-ion secondary battery cathode materials because of its stable layered structure, simple synthesis process, good electr...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/624H01M4/26H01M4/40
CPCY02E60/10
Inventor 张芃钟辉
Owner 成都市雷雳高科技发展有限公司
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