Surface coating material for cathode material of lithium ion battery and preparation method

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of inability to improve the material platform and initial efficiency, no effective measures to control the hydrolysis rate, uneven coating, etc., and achieve improvement. The effect of cycle performance and rate capability, low cost, and simple process

Active Publication Date: 2012-10-17
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum salts can effectively improve the cycle performance of the material, but cannot improve the platform and first-time efficiency of the material, and there is no effective measure to control the rate of hydrolysis, which is easy to generate precipitation and make the coating uneven

Method used

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  • Surface coating material for cathode material of lithium ion battery and preparation method
  • Surface coating material for cathode material of lithium ion battery and preparation method
  • Surface coating material for cathode material of lithium ion battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Measure 1.7mL ethyl acetoacetate (CH 3 COCH 2 COOC 2 H 5 ), dissolved in 50mL ethanol and stirred for 1h. Measure 4.8mL of n-butyl titanate (C 16 H 36 O 4 Ti) is added to the above solution. After continuous stirring for 2h, 2.132g of aluminum nitrate (Al(NO 3 ) 3 ) And 0.094g of lithium nitrate (LiNO 3 ). After stirring to fully dissolve, 0.24 mL of deionized water was added dropwise, stirred to fully hydrolyze, and left to stand to obtain a sol. Weigh 30g lithium cobalt oxide (LiCoO 2 ) Put into a beaker, measure 30mL of ethanol into it, and stir evenly; Measure 2.3mL of sol into lithium cobaltate dropwise, slowly heat to 60℃, continue to stir to volatilize the ethanol, and then put it in the oven drying. Put the dried materials into the muffle furnace and calcine at 750°C for 5 hours.

[0028] DLS analysis of the obtained titanium aluminum lithium mixed sol, the results are as follows figure 1 Shown. From figure 1 It can be seen that the particle size of the prepare...

Embodiment 2

[0031] Measure 5mL ethyl acetoacetate (CH 3 COCH 2 COOC 2 H 5 ), add 10 mL of n-butyl titanate and stir thoroughly with a magnetic stirrer to obtain liquid A. Measure 400 mL of deionized water, add 5.552 g of aluminum nitrate and add 3 drops of concentrated nitric acid (65%) dropwise, and stir well to obtain liquid B. Add liquid B to liquid A slowly, and continue to stir to obtain a sol. Weigh 10 g of lithium cobalt oxide, add 20 mL of deionized water, and stir; measure 2.9 mL of sol and add it dropwise to the lithium cobalt oxide. After stirring for 2 hours, perform suction filtration, and then put the material in an oven for drying. Put the dried materials into a muffle furnace and calcinate at 800°C for 5 hours.

Embodiment 3

[0033] Measure 40mL ethanol, add 3.8mL acetylacetone (CH 3 COCH 2 COCH 3 ) And stirring, adding 10 mL of n-butyl titanate and continuing to stir to obtain liquid A. Measure 350 mL of deionized water, add 7.218 g of aluminum nitrate and add 3 drops of concentrated nitric acid (65%) dropwise, and stir well to obtain liquid B. Add liquid B to liquid A slowly, and continue to stir to obtain a sol. Weigh 10 g of lithium cobaltate, add 20 mL of deionized water, and stir; measure 2.9 mL of sol and add it dropwise to the lithium cobaltate. After stirring for 2 hours, perform suction filtration, and then put the material in an oven for drying. Put the dried materials into the muffle furnace and calcine at 650℃ for 5h.

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Abstract

The invention discloses a surface coating material for a cathode material of a lithium ion battery and a preparation method. By a mode of preparing mixed sol, a metal ion doped titanium dioxide thin film is uniformly coated on the surface of the cathode material (such as LiCoO2) of the lithium ion battery. Due to the adoption of the metal ion doped titanium dioxide thin film, when the circulation performance and the rate capability of the cathode material under the high voltage are improved, the discharge plateau, the first efficiency and the discharge capacity of the cathode material are improved. Moreover, the surface coating material and the preparation method have the advantages of simple preparation process and low cost and are suitable for the industrial mass production.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery anode materials, and specifically relates to a surface coating material of a lithium ion battery anode material, and a preparation method of a lithium ion battery anode material coated with the material. Background technique [0002] Lithium-ion battery cathode materials are widely used in electronic equipment such as notebooks, mobile phones, digital cameras, and electric vehicles. With the increasing market demand for lithium-ion battery cathode materials, the requirements for material capacity, safety performance and cycle performance are also getting higher and higher. [0003] Lithium Cobalt Oxide (LiCoO 2 ) As an example, lithium cobalt oxide is currently the most commonly used cathode material for commercial lithium-ion batteries, and its theoretical capacity is 274mAhg -1 , But the actual capacity is far from this high. LiCoO 2 When charging and discharging at 0.1C between 3~4.2V, th...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 王丹周恒辉徐世国张卫东郭晓丰
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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