Preparation method of carbon-coated sodium-micron-scale lithium titanate composite anode material

A negative electrode material, lithium titanate technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of increasing lithium titanate production cost, long sintering time, complexity, etc., and achieve improvement Effects of electrochemical performance, high charge and discharge capacity, and uniform particle distribution

Active Publication Date: 2016-05-18
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above patents all prepare carbon-coated lithium titanate materials by the sol-gel method, these technologies either require complicated steps or expensive graphene and carbon nanotube raw materials to improve their conductivity, or require subsequent high-temperature treatment process and longer sintering time, thus increasing the production cost of lithium titanate

Method used

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  • Preparation method of carbon-coated sodium-micron-scale lithium titanate composite anode material
  • Preparation method of carbon-coated sodium-micron-scale lithium titanate composite anode material
  • Preparation method of carbon-coated sodium-micron-scale lithium titanate composite anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Dissolve 6.17g of lithium acetate dihydrate in an aqueous solution of absolute ethanol at room temperature, stir and ultrasonically dissolve it completely, and record it as solution a;

[0034] (2) Dissolve 20.00g of tetraisopropyl titanate in absolute ethanol at room temperature, stir evenly, and record it as solution b;

[0035] (3) Dissolve 8.87g of industrial oxalic acid in absolute ethanol at room temperature, and ultrasonically disperse to dissolve it completely, which is recorded as solution c;

[0036] (4) First slowly add solution c to solution b, and stir for about 30-40 minutes at the same time to obtain a white sol; then slowly add solution a to the above white sol, and age to obtain a light yellow transparent gel or white gel Glue, the dropping rate is 3ml / min;

[0037] (5) After aging the gel obtained in step (4), place it in a heating mantle, heat and stir at 80°C to obtain a white gel, then place it in a blast drying oven at 80°C for 12 hours, and r...

Embodiment 2

[0047] The difference between this embodiment and Example 1 is the time for pre-sintering and sintering the precursor in step six. The dry gel is fully ground and sieved with 300 mesh to obtain the precursor. The precursor was kept at 600°C for 5.5h at a heating rate of 5°C / min under an argon atmosphere, then raised to 800°C at the same heating rate and kept at 9.5h, cooled to room temperature with the furnace, and ground by 300-mesh sieve to obtain lithium titanate composite negative electrode material. That is 0.86-LTO-1-3.

Embodiment 3

[0049] The difference between this embodiment and Example 1 is that the molar ratio of lithium salt to titanium element used in step 1 is 4.2:5. The specific preparation method is as follows:

[0050] (1) Dissolve 5.04g of lithium acetate dihydrate in an aqueous solution of absolute ethanol at room temperature, stir and ultrasonically dissolve it completely, and record it as solution a;

[0051] (2) Dissolve 20g of tetrabutyl titanate in absolute ethanol at room temperature, stir evenly, and record it as solution b;

[0052] (3) Dissolve 11.29g of citric acid in absolute ethanol at room temperature, and ultrasonically disperse to dissolve it completely, which is recorded as solution c;

[0053] Other steps were the same as in Example 1 to obtain the positive electrode material 0.84-LTO-1-3 in the present invention.

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Abstract

The invention relates to a preparation method of a carbon-coated sodium-micron-scale lithium titanate composite anode material. The method comprises steps as follows: lithium salt is dissolved in an aqueous solution of absolute ethyl alcohol, and the solution is marked a solution a; an organic titanium compound and a carbon source are dissolved in absolute ethyl alcohol, and the solution is marked a solution b; a chelating agent M is dissolved in absolute ethyl alcohol, ultrasonic dispersion is performed, and the solution is marked a solution c; the solution c is slowly dropwise added to the solution b while stirring, and white sol is obtained; then the solution a is slowly dropwise added to the white sol; after the sol is aged, heating, stirring, drying, grinding, sieving and calcination are performed, and the carbon-coated lithium titanate composite anode material is obtained. Lithium titanate has narrower particle size distribution and more uniform particle distribution, and sodium-micron-scale particles are uniformly inlaid to form particles with high tap density; the particle structure is loose and porous, the specific surface area of a formed electrode is larger, getting off of lithium ions in the lithium titanate material is facilitated, and the stability of the crystal structure of the lithium ions in the charge and discharge process is guaranteed.

Description

(1) Technical field [0001] The invention belongs to the field of battery material science, in particular to a preparation method of a carbon-coated nano-micron lithium titanate composite negative electrode material. (2) Background technology [0002] Lithium-ion battery is considered as an ideal energy storage system due to its high specific energy, long cycle life, no memory effect, low pollution and low self-discharge rate. However, with the improvement of production and living standards, higher requirements are placed on the performance of lithium-ion batteries. The traditional carbon negative electrode materials have been insufficient in terms of high rate and high safety. First, the potential of the carbon negative electrode is very close to that of lithium. Lithium dendrites are formed; secondly, due to the layered structure of the graphite negative electrode, the lithium ion intercalation and intercalation process easily causes a large deformation (10.3%), resulting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 王文阁宋春华王瑛乔文灿赵成龙高洪森冯涛段振山赵艳丽赵秀萍黄振法
Owner SHANDONG YUHUANG NEW ENERGY TECH
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