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Alumina coating method of lithium ion battery positive electrode material

A technology for lithium ion batteries and cathode materials, which is applied in the field of preparation of electrode active materials, can solve the problems of slow solid-phase diffusion, difficulty in uniform mixing, and practical application effects, and achieves the effects of improving cycle stability and reducing capacity decay.

Inactive Publication Date: 2015-04-29
WUXI XINGBO ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In this patented process, we found that adding an insulating layer made from small particles called BAO (BaAl2o3) onto certain materials helps prevent them react with each other during charging or discharges without affecting their performance negatively. By doing this, they were able to make batteries last longer while maintain good quality standards.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the properties of laminated transition metal compound cathodes such as improved cycle life, reduced irreversibility during charging cycles with increased energy storage capability, better heat dissipating capabilities, higher electronic conduction rates, longer lifespan due to decreased solubility or poor crystal growth behavior caused by low temperatures.

Method used

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  • Alumina coating method of lithium ion battery positive electrode material
  • Alumina coating method of lithium ion battery positive electrode material
  • Alumina coating method of lithium ion battery positive electrode material

Examples

Experimental program
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Embodiment 1

[0020] Embodiment one: the lithium cobalt oxide (LiCoO 2 ) material suspended in Al(NO 3 ) 3 In the solution, the cathode material and aluminum nitrate nonahydrate (AlNO 3 9H 2 O) with a mass ratio of 100:23, under continuous stirring, slowly add ammonia water dropwise to make the Al in the solution 3+ All ions are Al(OH) 3 Precipitate in the form, add ammonia water dropwise at a rate of 10 seconds per drop. The mixed precipitate was filtered, washed, and heated at 300 °C for 4 h in an air-atmosphere muffle furnace to obtain Al 2 o 3 Coated lithium cobalt oxide cathode material.

Embodiment 2

[0021] Embodiment two: with the spinel type lithium manganese oxide (LiMn 2 o 4 ) material is the coating object, and the coating is carried out with reference to the method of Example 1. The positive electrode material and aluminum nitrate nonahydrate (AlNO 3 9H 2 The mass ratio of O) is 100:23, and other conditions are unchanged with reference to Example 1. The obtained precipitate is heated at 270° C. for 5 hours in a muffle furnace in an air atmosphere to obtain Al 2 o 3 Coated spinel lithium manganese oxide cathode material.

Embodiment 3

[0022] Embodiment three: with the layered lithium manganese oxide (Li 2 MnO 3 ) material is the coating object, and the coating is carried out with reference to the method of Example 1. The positive electrode material and aluminum nitrate nonahydrate (AlNO 3 9H 2 The mass ratio of O) is 100:23, and other conditions are unchanged with reference to Example 1. The obtained precipitate is heated at 330° C. for 2 hours in an air atmosphere muffle furnace to obtain Al 2 o 3 Coated layered lithium manganese oxide cathode material. .

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Abstract

The invention discloses an alumina coating method of a lithium ion battery positive electrode material. The method comprises the following steps: adding ammonia water to a positive electrode material suspended aluminum nitrate solution in a dropwise manner to form a precipitate coated by Al(OH)3, and heating the precipitate in an air atmosphere muffle furnace to form an alumina coated positive electrode material. The coating method can improve the charge and discharge capacity of the lithium ion battery and prolong the cycle life.

Description

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Claims

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Application Information

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Owner WUXI XINGBO ENERGY TECH
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