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Method for modifying lithium cobalt oxide material

A unique lithium cobalt oxide, soluble technology, applied in the field of modified lithium cobalt oxide materials, can solve the problems of poor resistance to overcharge, poor cycle performance of lithium cobalt oxide, etc., to improve cycle performance, improve rate performance, and enhance application prospects. Effect

Inactive Publication Date: 2015-01-28
NANJING UNIV OF TECH
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  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to improve the shortcomings of commercial lithium cobalt oxide such as poor cycle performance and poor overcharge resistance, and provide a method for modifying lithium cobalt oxide materials. Through a simple process, the composite electrolyte material Li 3x La 2 / 3-x TiO 3 and LiCoO 2 , to obtain better performance and more promising cathode materials for lithium-ion batteries

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  • Method for modifying lithium cobalt oxide material
  • Method for modifying lithium cobalt oxide material
  • Method for modifying lithium cobalt oxide material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: LiCoO 2 -Li 0.35 La 0.55 TiO 3 (5wt%) synthesis, structural stability test and electrochemical performance test of a simulated battery assembled with Li in the voltage range of 2.7-4.2V.

[0022] Weigh lithium nitrate, lanthanum nitrate, and tetrabutyl titanate in a certain molar ratio, and obtain Li 0.35 La 0.55 TiO 3 Sol, with LiCoO 2 Mix, Li 0.35 La 0.55 TiO 3 accounted for LiCoO 2 5% of the mass, stirred at 100°C for 1 hour, then baked in an oven at 250°C for 5 hours, then baked in a muffle furnace at 800°C, holding time for 5 hours, and the heating rate was 5°C min -1 , that is, to get the required LiCoO 2 -Li 0.35 La 0.55 TiO 3 (5 wt%) composite material.

[0023] XRD powder diffraction method such as figure 1 shown, indicating 5wt% L 0.35 With the addition of LTO, no phase change occurred. The microstructure of the product was observed by SEM, such as figure 2 As shown in a, it is LiCoO 2 The SEM picture, as can be seen from the fi...

Embodiment 2

[0026] Example 2: LiCoO 2 -Li 0.35 La 0.55 TiO 3(0.05wt%) and Li assembled to simulate the electrochemical performance test of the battery in the voltage range of 2.7-4.2V.

[0027] Weigh lithium acetate, lanthanum oxide, titanium tetrachloride in a certain molar ratio, dissolve lanthanum oxide with nitric acid to obtain a lanthanum solution, and then pass through the EDTA-CA method (refer to M.Vijayakumar, Y.Inaguma et al.Chem.Mater.16 (2004) 2719-2724) prepared Li 0.35 La 0.55 TiO 3 Sol, with LiCoO 2 Mix, Li 0.35 La 0.55 TiO 3 accounted for LiCoO 2 0.05% of the mass, stir at 40°C for 5 hours, then bake in an oven at 180°C for 12 hours, then bake in a muffle furnace at 700°C, hold for 8 hours, and heat up at a rate of 10°C min -1 , that is, to get the required LiCoO 2 -Li 0.35 La 0.55 TiO 3 (0.05 wt%) composite material.

[0028] XRD powder diffraction method such as Image 6 shown, indicating that 0.05wt% Li 0.35 La 0.55 TiO 3 The addition of , no phase c...

Embodiment 3

[0029] Example 3: LiCoO 2 -Li 0.75 La 0.42 TiO 3 (2.5wt%) and Li are assembled to simulate the electrochemical performance test of the battery in the voltage range of 2.7-4.2V.

[0030] Lithium carbonate, lanthanum nitrate, and tetrabutyl titanate are weighed in a certain molar ratio, and Li 0.75 La 0.42 TiO 3 Sol, with LiCoO 2 Mix, Li 0.75 La 0.42 TiO 3 accounted for LiCoO 2 2.5% of the mass, stirred at 80°C for 2 hours, then baked in an oven at 200°C for 6 hours, then baked in a muffle furnace at 750°C, holding time for 6 hours, and the heating rate is 6°C min -1 , that is, to get the required LiCoO 2 -Li 0.75 L a0.42 TiO 3 (2.5 wt%) composite material.

[0031] XRD powder diffraction method such as Figure 7 shown, indicating that 2.5wt% Li 0.75 La 0.42 TiO 3 addition, no phase change occurred. A simulated battery was assembled according to the method of Example 1. Investigate the charge-discharge cycle performance on a high-precision battery tester. I...

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Abstract

The invention provides a method for modifying a lithium cobalt oxide material. The method comprises the steps of adding Li3xLa(2 / 3-x)TiO3 sol obtained by EDTA-CA complexing into LiCoO2, uniformly stirring, and calcining to change the original LiCoO2 layered structure into a sandwich structure LiCoO2-Li3xLa(2 / 3-x)TiO3. The technology of the method is simple, and the obtained LiCoO2-Li3xLa(2 / 3-x)TiO3 has a unique structure; furthermore, by the LiCoO2-Li3xLa2 / 3-xTiO3 particles embedded into the LiCoO2 layer, the LiCoO2 layer is stable, and the problem that the LiCoO2 layered structure is collapsed in a battery circulating process can be prevented; meanwhile, due to the LiCoO2-Li3xLa(2 / 3-x)TiO3 particles, Co<3+> cannot be in direct contact with electrolyte, and dissolving amount of Co<3+> is reduced; the compounded LiCoO2-Li3xLa(2 / 3-x)TiO3 material is excellent in circulating and multiplying performance, so that the safety stability of a battery is improved; the LiCoO2-Li3xLa(2 / 3-x)TiO3 material is an extremely good lithium ion battery positive electrode material, and the use prospect of commercial LiCoO2 is greatly enhanced.

Description

technical field [0001] The invention relates to a method for modifying a lithium cobaltate material, which belongs to the technical field of lithium ion batteries. A simple process is used to insert a solid electrolyte between layers of anode material lithium cobaltate to form a sandwich structure. A safe and stable cathode material with high cycle performance and high rate performance is provided. Background technique [0002] Lithium-ion secondary batteries have the advantages of large specific capacity, charge-discharge life, long memory effect, and low environmental pollution. Since their commercialization in the early 1990s, they have quickly replaced nickel-cadmium and nickel-metal hydride batteries and are widely used in mobile phones and notebooks. In portable electrical appliances such as computer cameras. The research on new lithium-ion battery materials has very important practical significance for solving global energy and environmental problems. [0003] LiCoO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G51/00
CPCH01M4/525C01G51/42Y02E60/10
Inventor 邵宗平赵亦男沙玉静蔡锐
Owner NANJING UNIV OF TECH
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