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A preparation method of aluminum oxide-doped lithium titanate composite negative electrode material

A technology containing alumina and negative electrode materials, applied in the direction of chemical instruments and methods, negative electrodes, titanate, etc., to achieve the effects of low price, suppressed gas production, and easy access

Active Publication Date: 2019-07-23
四川国创成电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention aims to solve the problem of lithium titanate gas production, with the aim of high-efficiency preparation process, obvious doping effect and low cost, and provides a lithium titanate composite negative electrode material containing aluminum oxide doped and its preparation method

Method used

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Effect test

Embodiment 1

[0027] A preparation method containing aluminum oxide doped lithium titanate composite negative electrode material, comprising the following steps:

[0028] A. Add deionized water to prepare titanium dioxide suspension in a mixing tank at a solid-to-liquid ratio of 1:10, and add deionized water at a ratio of 1:10 to prepare an aluminum chloride solution at a concentration of 1:100 The ratio is added to deionized water to configure ammonia solution.

[0029] B. Keep stirring, slowly inject the aluminum chloride solution into the titanium dioxide suspension according to the ratio of the molar ratio of aluminum ions to titanium ions of 1:100, and at the same time according to the ratio of 1:5 of the molar ratio of aluminum ions to hydroxide ions Slowly inject the ammonia solution into the titanium dioxide suspension to keep the pH value of the suspension at 7.1. After all the aluminum chloride is precipitated into hydrated alumina, keep the pH value of the solution at 7.1 and co...

Embodiment 2

[0035] A preparation method containing aluminum oxide doped lithium titanate composite negative electrode material, comprising the following steps:

[0036] A. Add deionized water to prepare titanium dioxide suspension in the mixing tank according to the ratio of solid to liquid ratio of 1:20, add deionized water to prepare aluminum sulfate solution according to the ratio of 1:40, and prepare the aluminum sulfate solution according to the concentration of 1:80 Proportionally add deionized water to configure ammonia solution.

[0037] B. Keep stirring, slowly inject the aluminum sulfate solution into the titanium dioxide suspension according to the molar ratio of aluminum ions and titanium ions at a ratio of 1:50, and at the same time slowly inject the aluminum ion to hydroxide ion molar ratio at a ratio of 1:10 Inject the ammonia solution into the titanium dioxide suspension, and keep the pH value of the suspension at 7.8. After all the aluminum sulfate is precipitated into h...

Embodiment 3

[0043] A preparation method containing aluminum oxide doped lithium titanate composite negative electrode material, comprising the following steps:

[0044] A. Add deionized water to prepare titanium dioxide suspension in a mixing tank at a solid-to-liquid ratio of 1:100, and add deionized water at a ratio of 1:100 to prepare an aluminum chloride solution at a concentration of 1:10 The ratio is added to deionized water to configure ammonia solution.

[0045] B. Keep stirring, slowly inject the aluminum nitrate solution into the titanium dioxide suspension according to the molar ratio of aluminum ions and titanium ions at a ratio of 1:20, and slowly inject the aluminum nitrate solution at a ratio of 1:20 at the same time Inject the ammonia solution into the titanium dioxide suspension, and keep the pH value in the suspension at 9. After all the aluminum nitrate is precipitated into hydrated alumina, keep the pH of the solution at 9 and continue to stir for 6 hours to obtain a ...

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Abstract

The invention relates to a preparation method of an aluminum oxide-doped lithium titanate composite negative material, and belongs to the technical field of lithium ion battery negative materials. The preparation method comprises the steps of firstly preparing titanium dioxide turbid liquid, and keeping in a stirring effect; then adding soluble aluminum salt solution and aqueous ammonia into the turbid liquid, thus obtaining hydrated alumina sediment, keeping a pH value in a range of 7.1-9, and attaching the hydrated alumina to the surface of titanium dioxide via electrostatic incorporation; and at last after lithium salt is mixed with the titanium dioxide / hydrated alumina, preparing the aluminum oxide-doped lithium titanate composite negative material, Li(4+x)Al(x)Ti(5-x)O12, by using a segmented sintering method, wherein x is not more than 0.5 and not less than 0.05. According to the method provided by the invention, the purpose of restraining lithium titanate from producing gas is achieved by replacing a part of Ti<4+> ions on the surface with Al <3+> ions. The material is prepared by using the electrostatic adsorption method, and thus the acquired material is high in consistency, low in cost and prone to industrial production.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery material. Specifically, the invention relates to a preparation method of a lithium titanate composite negative electrode material doped with aluminum oxide, which belongs to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion battery is a battery that can be repeatedly charged and discharged. Lithium-ion battery is widely used as a power source in portable electronic products such as mobile phones, cameras, and laptop computers. In recent years, as power batteries and energy storage power sources, lithium-ion batteries have also been gradually used in hybrid vehicles, pure electric vehicles and renewable energy power stations. [0003] Lithium titanate material has the following advantages as the negative electrode material of lithium battery: stable structure of spinel lithium titanate, zero strain during charging and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525C01G23/00
CPCC01G23/005H01M4/485H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 胡蕴成王睿
Owner 四川国创成电池材料有限公司
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