Preparation method of lithium titanate (Li4Ti5O12)/Ag composite lithium-ion negative electrode materials

A negative electrode material and lithium ion technology, which is applied in the field of electrochemical battery material preparation, can solve the problems of poor high-rate charge-discharge performance and large energy consumption of lithium titanate materials, and achieves favorable migration and migration, uniform structure, and high energy consumption. wide range of effects

Inactive Publication Date: 2012-07-25
SHANGHAI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

The lithium titanate materials prepared by these two methods have poor high-rate charge and discharge performance, and the energy consumption in the reaction process is large.

Method used

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  • Preparation method of lithium titanate (Li4Ti5O12)/Ag composite lithium-ion negative electrode materials
  • Preparation method of lithium titanate (Li4Ti5O12)/Ag composite lithium-ion negative electrode materials
  • Preparation method of lithium titanate (Li4Ti5O12)/Ag composite lithium-ion negative electrode materials

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Experimental program
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Effect test

Embodiment 1

[0022] The preparation process and steps in this embodiment are as follows:

[0023] (1) Dissolving isopropyl titanate in a certain amount of deionized water is A liquid;

[0024] (2) Lithium hydroxide monohydrate is dissolved in a certain amount of deionized water, and the atomic molar ratio n of the two is maintained Li :n Ti =1:1.1, according to 1‰Ag of the product mass, add silver nitrate solution source to be B liquid;

[0025] (3) Slowly add liquid B into liquid A under magnetic stirring, and stir for 30 minutes;

[0026] (4) Pour the mixed solution into a high-temperature reaction kettle, and then place it in an oven at 160°C for 10 hours to react. After the reaction, naturally cool to room temperature, then perform suction filtration, wash with deionized water, and dry at 60°C to obtain the precursor;

[0027] (5) The obtained precursor was sintered at 500 °C for 2 h under a nitrogen atmosphere, and the obtained product was nanoscale Li 4 Ti 5 o 12 / Ag material. ...

Embodiment 2

[0032] The preparation process and steps in this embodiment are as follows:

[0033] (1) the amorphous TiO 2 Dissolve in a certain amount of deionized water to form A liquid;

[0034] (2) Lithium acetate is dissolved in a certain amount of deionized water, and the atomic molar ratio n of the two is maintained Li :n Ti =1:1.1, add silver nitrate solution according to 5‰ of the product weight, and it is B liquid;

[0035] (3) Slowly add liquid B into liquid A under magnetic stirring, and stir for 30 minutes;

[0036] (4) Pour the mixed solution into a high-temperature reaction kettle, and then place it in an oven at 120°C for 14 hours to react. After the reaction, naturally cool to room temperature, then perform suction filtration, wash with deionized water, and dry at 60°C to obtain the precursor;

[0037] (5) The obtained precursor was sintered at 600° C. for 5 h under a nitrogen atmosphere, and the obtained product was a pure lithium titanate material.

[0038] The test me...

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Abstract

The invention discloses a preparation method of nanometer lithium titanate (Li4Ti5O12) / Ag composite lithium-ion negative electrode materials. The Ag doping modification is simultaneously carried out on the nanometer Li4Ti5O12. The chemical ingredients and the grain diameters of the Li4Ti5O12 are effectively controlled through hydrothermal treatment, the temperature during the subsequent treatment is greatly shortened, the grain agglomeration is prevented, and the industrial implementation is easier. In the preparation process, the Ag is doped, the conductivity of the materials is greatly improved, and meanwhile, the high-power charging and discharging performance and the cyclic times of the materials are effectively improved. The high-power specific capacity of the prepared materials is high, and the materials can be used for batteries required by various kinds of portable electronic equipment and various electric vehicles.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical battery materials. In particular, it relates to a hydrothermal preparation method of lithium titanate, a nano-scale, silver-doped lithium ion battery negative electrode material. Background technique [0002] With the rapid development of society, the problems of energy and environment have become increasingly prominent, and it has become more urgent to find new clean energy to replace petroleum resources. As a new type of clean energy, the power battery has been valued by countries all over the world. Power batteries are the core components of electric vehicles, electric tools and other mobile electrical appliances. Pure electric vehicles (EV) or hybrid electric vehicles (HEV) with power batteries as the main or auxiliary power source are one of the main development directions of the automotive industry. one. At the same time, the state has accelerated the adjustment of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/485
CPCY02E60/122Y02E60/10
Inventor 刘洪江王洁施利毅张登松程崇领曹绍梅
Owner SHANGHAI UNIV
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