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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 samples will be invalid after storage for a certain period of time; (2) Generally speaking, the washing treatment will lead to a decrease in the discharge capacity of the positive electrode material
(4) Chinese invention patent CN102593463A discloses a lithium-ion battery cathode material coating technology. The coating material is prepared by the reaction of A-type agent and B-type agent. This patent solves the uniformity and operability of the coating, and does not Considering the influence of free lithium compound impurities on the surface of the active material on the electrochemical performance of the material

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
Effect test

Embodiment 1

[0053] First weigh 4.1g of boric acid, 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 water bath at 100°C and stir until the solvent is dissolved Volatilize completely, and then put it into a vacuum oven and bake 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.

Embodiment 2

[0055] First weigh 1.3g of phosphoric acid, 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 fully at room temperature for 2 hours, then place it in a water bath at 100°C and stir until the solvent dissolves Completely volatilized; then put it into a vacuum oven and bake 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.

Embodiment 3

[0057] First measure 5.9ml tetrabutyl titanate (C 16 h 36 o 4 Ti), dissolved in 50ml of absolute ethanol, added 50ml of water and 2ml of acetic acid as a catalyst to accelerate the hydrolysis of tetrabutyl titanate; then, weighed 200g of the material synthesized in Comparative Example 1 and added it to the above mixture, and stirred at room temperature for 4h Finally, heat and stir in a 90°C water bath until the solvent is completely volatilized; finally, put the completely volatilized material in a vacuum drying oven at 120°C 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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