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Preparation method and application of a fast ion conductor coating modified lithium ion battery positive electrode material

A technology of lithium ion battery and positive electrode material is applied in the preparation of fast ion conductor coating modified lithium ion battery positive electrode material, application in lithium ion battery, and the field of preparation of modified lithium ion battery positive electrode material, which can solve the problem of fast ion conductor The operation is complicated, it is difficult to industrialize production, and the cost is high. It can improve the electrochemical performance, prevent dissolution and loss, and achieve good stability.

Active Publication Date: 2019-05-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional coating method, the preparation process of fast ion conductors has the disadvantages of complicated operation and high cost, and it is difficult to realize large-scale industrial production

Method used

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  • Preparation method and application of a fast ion conductor coating modified lithium ion battery positive electrode material
  • Preparation method and application of a fast ion conductor coating modified lithium ion battery positive electrode material
  • Preparation method and application of a fast ion conductor coating modified lithium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) According to LiAlO 2 The relative positive electrode material is 1% mass percent to weigh ultrafine (nanoscale) aluminum powder and LiNi powder with a particle diameter of 300nm 0.5 co 0.2 mn 0.3 o 2 The positive electrode material was added to a steel ball mill jar containing agate balls with a capacity of 250mL, and then the speed was adjusted to 400p / min for grinding for 2h.

[0036] (2) aluminum powder and LiNi after grinding activation in step (1) 0.5 co 0.2 mn 0.3 o 2 The positive electrode material mixture was added into a three-necked flask containing 100 mL of a LiCl solution with a concentration of 1 mol / L, and stirred and reacted at 50° C. for 1 h.

[0037] (3) Wash the precipitate obtained in step (2) with deionized water for 3 times, then wash with absolute ethanol for 3 times, then filter, and keep the filter cake in a blast oven at 80°C for 12 hours to obtain xLi + ·Al(OH) 3 ·yH 2 The precursor of O-coated cathode materials.

[0038] (4) Pu...

Embodiment 2

[0045] (1) According to LiAlO 2 The relative positive electrode material is 0.5% mass percent to weigh ultrafine aluminum powder (nano-scale) and LiNi with a particle diameter of 100nm respectively. 0.85 co 0.05 mn 0.1 o 2 Add the positive electrode material into a 250mL steel ball mill jar filled with agate balls, and then adjust the rotation speed to 500p / min for grinding for 4h.

[0046] (2) aluminum powder and LiNi after grinding activation in step (1) 0.85 co 0.05 mn 0.1 o 2 The positive electrode material mixture is added to the 100mL concentration of 0.5mol / L LiNO 3 In the three-necked flask of the solution, the reaction was stirred at 60° C. for 2 h.

[0047] (3) Wash the precipitate obtained in step (2) with deionized water for 3 times, then wash with absolute ethanol for 3 times, then filter, and keep the filter cake in a blast oven at 80°C for 12 hours to obtain xLi + ·Al(OH) 3 ·yH 2 The precursor of O-coated cathode materials.

[0048] (4) Put the precu...

Embodiment 3

[0052] (1) According to LiAlO 2 The relative positive electrode material is 2% mass percent to take the superfine aluminum powder (nano-scale) and LiNi with a particle diameter of 100nm 0.333 co 0.333 mn 0.333 o 2 The positive electrode material was added to a 250mL steel ball mill jar filled with agate balls, and then the speed was adjusted to 600p / min for grinding for 5h.

[0053] (2) aluminum powder and LiNi after grinding activation in step (1) 0.333 co 0.333 mn 0.333 o 2 The positive electrode material mixture was added into a three-necked flask containing 100 mL of LiOH solution with a concentration of 2 mol / L, and stirred and reacted at 80° C. for 5 h.

[0054] (3) Wash the precipitate obtained in step (2) with deionized water for 3 times, then wash with absolute ethanol for 3 times, then filter, and keep the filter cake in a blast oven at 80°C for 12 hours to obtain xLi + ·Al(OH) 3 ·yH 2 The precursor of O-coated cathode materials.

[0055] (4) Put the precu...

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Abstract

The invention discloses a preparation method and application of a fast ion conductor-coated lithium-ion battery positive electrode material; the method is to mix nano-scale aluminum powder and positive electrode material by ball milling, and then stir and react with a lithium-containing solution to obtain aluminum hydroxide colloidal coating Coated positive electrode material precursor; the aluminum hydroxide colloid coated positive electrode material precursor is calcined at a high temperature to obtain a lithium ion battery positive electrode material coated with a dense, uniform and stable fast ion conductor, which can be used for A lithium-ion battery positive electrode with high rate performance and high cycle performance is prepared, and the preparation method has the characteristics of low cost, simple operation, and environmental friendliness, and can be applied to industrial production on a large scale.

Description

technical field [0001] The present invention relates to a preparation method of a modified lithium-ion battery positive electrode material, in particular to a preparation method of a fast ion conductor-coated modified lithium-ion battery positive electrode material, and its application in the preparation of a lithium-ion battery with a high cycle life. It belongs to the technical field of lithium ion batteries. Background technique [0002] Today, the rapid development of mobile electronic devices, such as smart phones, digital cameras, and notebook computers, as well as electric and hybrid vehicles, has promoted the rapid development of lithium-ion secondary battery technology. However, the current cathode materials for lithium-ion batteries, such as lithium cobaltate, spinel lithium manganate, and lithium iron phosphate, all have the disadvantage of low cycle life and cannot meet the requirements of future pure electric equipment. Therefore, research and development of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525H01M10/058
CPCH01M4/131H01M4/1391H01M4/362H01M4/505H01M4/525H01M4/628H01M10/0525H01M10/058H01M2220/20H01M2220/30Y02E60/10Y02P70/50
Inventor 张治安赖延清徐明张凯李劼
Owner CENT SOUTH UNIV
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