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Rare earth doped lithium titanate electrode material and preparation method thereof

A technology of rare earth doping and lithium titanate, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of low lithium ion diffusion coefficient and electronic conductivity, limit fast charge and discharge performance, etc., and achieve good cycle stability, Good fast charge and discharge ability, simple preparation method

Active Publication Date: 2019-05-10
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, spinel lithium titanate (Li 4 Ti 5 o 12 )'s low lithium ion diffusion coefficient and electronic conductivity limit its fast charge-discharge performance at high rates. Therefore, it is urgent to develop an electrode material that can charge and discharge rapidly at high rates.

Method used

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  • Rare earth doped lithium titanate electrode material and preparation method thereof
  • Rare earth doped lithium titanate electrode material and preparation method thereof
  • Rare earth doped lithium titanate electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Step 1) Titanium dioxide, lithium carbonate, lanthanum nitrate, and glucose are mixed in ethanol in proportion, and ball milled to prepare slurry; wherein, the mass ratio of glucose to titanium dioxide is 1:10, and the molar ratio of lanthanum nitrate to titanium dioxide is 1:499;

[0026] Step 2) drying the slurry in an oven at 80° C. for 12 hours to prepare a precursor of lanthanum-doped lithium titanate;

[0027] Step 3) Putting the precursor into a tube furnace, and calcining at 950° C. for 6 hours under the protection of a nitrogen atmosphere to prepare a carbon-coated lanthanum-doped lithium titanate precursor;

[0028] Step 4) The carbon-coated lanthanum-doped lithium titanate precursor is then put into a box furnace and calcined at 600° C. for 2 hours in an air atmosphere to prepare lanthanum-doped lithium titanate.

Embodiment 2

[0030] Other conditions are the same as in Example 1, and the difference from Example 1 is that in step 1), the mass ratio of glucose to titanium dioxide is 2:1.

Embodiment 3

[0032] Other conditions are the same as in Example 1, and the difference from Example 1 is that in step 1), the mass ratio of glucose to titanium dioxide is 1:1.

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Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to a rare earth doped lithium titanate electrode material and a preparation method thereof. The preparation method for the rare earth doped lithium titanate electrode material comprises the following steps that: firstly, mixing titanium dioxide, lithium carbonate, rare earth compound and carbohydrate in solvent to prepare slurry; drying the slurry; under an inert atmosphere, a reduction atmosphere or a vacuum atmosphere, carrying out first-stage calcination; and under an oxidization atmosphere, carrying out second-stage calcination to prepare the rare earth doped lithium titanate electrode material. The rare earth doped lithium titanate electrode material prepared with the preparation method has excellent characteristics, including high multiplying power performance, good cycling stability, quick charging and discharging capability and the like. In addition, the preparation method is simple and can carry out batch preparation.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a rare earth-doped lithium titanate electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in the field of energy storage due to their high energy density and long cycle life. Spinel lithium titanate (Li 4 Ti 5 o 12 ) has the advantages of high safety and good cycle stability, and has become an ideal lithium-ion anode material. However, spinel lithium titanate (Li 4 Ti 5 o 12 )’s low lithium-ion diffusion coefficient and electronic conductivity limit its fast charge-discharge performance at high rates. Therefore, it is urgent to develop an electrode material that can charge and discharge rapidly at high rates. Contents of the invention [0003] In order to improve the above technical problems, the present invention provides a rare earth doped lithium titanate material, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M4/04H01M10/0525
CPCY02E60/10
Inventor 张易宁张祥昕李达禄陈素晶王维刘永川苗小飞陈远强林俊鸿林长新
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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