Positive pole material for lithium ion battery and preparation method of positive pole material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced discharge capacity of positive electrode materials, increased pH value, and failure to consider the impact of electrochemical performance

Active Publication Date: 2013-08-14
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above method has obvious disadvantages: (1) Although the washing treatment effectively removes the free lithium compound on the surface of the positive electrode material and effectively reduces the pH value of the positive electrode material, during the storage process of the material, due to the low solubility of Li on the surface of the material, The Li atoms inside the particle continuously diffuse to the surface of the particle, and after long-term contact with the air, Li atoms are re-formed. 2 CO 3 and LiOH, so that the pH value increases, therefore, the treatment effect of the washed

Method used

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  • Positive pole material for lithium ion battery and preparation method of positive pole material
  • Positive pole material for lithium ion battery and preparation method of positive pole material
  • Positive pole material for lithium ion battery and preparation method of positive pole material

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0052] Example 1:

[0053] Weigh 4.1g of boric acid and dissolve it in 100ml of distilled water, then weigh 200g of the positive electrode material synthesized in Comparative Example 1 and add it to the prepared boric acid aqueous solution. Stir fully at room temperature for 2 hours, then place it in a 100℃ water bath and stir until the solvent After the volatilization is complete, put it in a vacuum drying oven at 200°C for 12 hours to obtain Li 2 B 4 O 7 Coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 Cathode material.

Example Embodiment

[0054] Example 2:

[0055] Weigh 1.3g of phosphoric acid and dissolve it in 100ml of distilled water, then weigh 200g of the positive electrode material synthesized in Comparative Example 1 and add it to the prepared phosphoric acid aqueous solution, stir well for 2h at room temperature, and then place it in a 100℃ water bath and stir until the solvent The volatilization is complete; then put it in a vacuum drying oven at 200°C for 12 hours to obtain Li 3 PO 4 Coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 Cathode material.

Example Embodiment

[0056] Example 3:

[0057] First measure 5.9ml of tetrabutyl titanate (C 16 H 36 O 4 Ti), dissolved in 50ml of absolute ethanol, add 50ml of water and 2ml of acetic acid as a catalyst to accelerate the hydrolysis of tetrabutyl titanate; then, weigh 200g of the material synthesized in Comparative Example 1 and add it to the above mixed solution, and stir well at room temperature for 4 hours Then, heat and stir in a water bath at 90℃ until the solvent is completely evaporated; finally, put the completely evaporated material in a vacuum drying oven at 120℃ and bake for 12 hours to obtain Li 2 TiO 3 Coated LiNi 0.5 Co 0.2 Mn 0.3 O 2 Cathode material.

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Abstract

The invention relates to a surface modifying method of a lamellar lithium-nickel series compound oxide positive pole material, a chemical formula of which is LiNixM1-xO2, wherein M is one or more of Co, Mn and Al, and x is not less than 0.2 or less than 1. Through selecting boric acid or phosphoric acid which is capable of reacting with an ionization lithium compound on the surface of the positive pole material to generate a lithium salt which does not dissolve in water or slightly dissolve in water, or silicate ester or titanate which is capable of being hydrolyzed to obtain silicic acid or titanic acid, and a liquid phase system reacts and then is directly dried to obtain the lamellar lithium-nickel series compound oxide positive pole material, with the surface being wrapped by the lithium salt. According to the surface modifying method, the content of the ionization lithium compound on the surface of the lamellar lithium-nickel series compound oxide positive pole material is effectively reduced, a uniform lithium salt wrapping layer is formed on the surface of the lamellar lithium-nickel series compound oxide positive pole material, and thus the processing property and the storage stability of the positive pole material are improved, and the circulatory stability and high-temperature storage performance of a lithium ion battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular, the invention relates to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] The cathode material of lithium-ion batteries is one of the key materials to improve the cost performance of lithium-ion batteries. At present, LiCoO is widely used commercially. 2 Material. Same as LiCoO 2 Compared with the layered lithium-nickel composite oxide cathode material LiNi x m 1-x o 2 , wherein M is one or more elements of Co, Mn, Al, 0.4≤x<1. This type of material has a high discharge capacity of 250mAh / g, which is significantly higher than that of LiCoO 2 The discharge capacity is 140mAh / g, which has obvious advantages in energy density. Therefore, layered lithium-nickel composite oxide cathode materials have become a research hotspot in recent years. [0003] Layered cathode materials (LiNi x m 1-x o 2 ) in the Li atom at t...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/136H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 岳敏傅儒生杨顺毅黄友元任建国
Owner BTR NEW MATERIAL GRP CO LTD
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