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Lithium ion battery cathode material as well as preparation method and application thereof

A polarity and reaction technology, applied in the field of electrochemistry, can solve the problems of increasing the process, etc., and achieve the effect of stable product quality, high reproducibility, and excellent electrochemical performance

Active Publication Date: 2012-08-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li prepared by soluble metal Ti salt and lithium salt by hydrothermal method and sol-gel method 4 Ti 5 o 12 , which does not depart from the aforementioned methods in essence, because these methods first use the active anatase TiO generated by the hydrolysis of metal Ti salt 2 , and then through the active TiO 2 Reaction with lithium salts to prepare Li 4 Ti 5 o 12 , so prepared Li 4 Ti 5 o 12 The morphology is richer and can be adjusted, but it requires a two-step reaction, which increases the process

Method used

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  • Lithium ion battery cathode material as well as preparation method and application thereof
  • Lithium ion battery cathode material as well as preparation method and application thereof
  • Lithium ion battery cathode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Take 1.7mL (5mmol) of tetrabutyl titanate (purchased from Beijing Jinlong Chemical Reagent Co., Ltd.) and add it to 25mL of absolute ethanol. 15-25° C., keep the humidity <10% RH, and stir for 30 minutes to obtain an ethanol solution of tetrabutyl titanate.

[0033] 2) Add 0.189g (4.5mmol) LiOH·H to the ethanol solution of tetrabutyl titanate obtained in step 1) 2 O(Alfa), continue to stir for 24h, until LiOH·H in the solution 2 O is completely dispersed in the solution until there is no more LiOH·H at the bottom of the container 2 Precipitation of O gives a mixed solution.

[0034] 3) Add 25 mL of water to the mixed solution obtained in step 2), adjust the pH value to 13 with 25% ammonia solution, and stir vigorously for 2 minutes. The solution first becomes colorless and transparent, and then gradually becomes a white latex solution. Before the solution solidifies, Quickly transfer the white latex solution into a 100mL Teflon hydrothermal reaction kettle, put th...

Embodiment 2

[0040] 1) Take 3.4mL (10mmol) of tetraisopropanol titanate (Sigma-Aldrich) and add it to 25mL of absolute ethanol. °C, keep the humidity <10%RH, and stir for 30 minutes to obtain an ethanol solution of tetraisopropanol titanate.

[0041] 2) Add 0.378g (9mmol) LiOH·H to the ethanol solution of tetraisopropanol titanate obtained in step 1) 2 O(Alfa), continue to stir for 24h, until LiOH·H in the solution 2 O is completely dispersed in the solution until there is no more LiOH·H at the bottom of the container 2 Precipitation of O gives a mixed solution.

[0042] 3) Add 25 mL of water to the mixed solution obtained in step 2), adjust the pH value to 13 with 25% ammonia solution, and stir vigorously for 2 minutes. The solution first becomes colorless and transparent, and then gradually becomes a white latex solution. Before the solution solidifies, Quickly transfer the solution to a 100mL Teflon hydrothermal reaction kettle, put the reaction kettle in an oven, keep it at 170°C fo...

Embodiment 3

[0044] 1) Take 5.1mL (5mmol) of tetrabutyl titanate (Beijing Jinlong Chemical Reagent Co., Ltd.) and add it to 25mL of absolute ethanol. 25° C., keep the humidity <10% RH, and stir for 30 minutes to obtain an ethanol solution of tetrabutyl titanate.

[0045] 2) Add 0.233g (4.5mmol) LiOC to the ethanol solution of tetrabutyl titanate obtained in step 1) 2 h 5 (Lithium ethoxide) (Sigma-Aldrich), continue to stir for 24h, until the lithium ethoxide in the solution is completely dispersed in the solution, until there is no precipitation of lithium ethoxide at the bottom of the container to obtain a mixed solution.

[0046] 3) Add 25 mL of water to the mixed solution obtained in step 2), adjust the pH value to 13 with 25% ammonia solution, and stir vigorously for 2 minutes. The solution first becomes colorless and transparent, and then gradually becomes a white latex solution. Before the solution solidifies, Quickly transfer the solution to a 100mL Teflon hydrothermal reaction ke...

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Abstract

The invention discloses a lithium ion battery cathode material Li4Ti5O12 as well as a preparation method and application thereof. The method comprises the steps: (1) uniformly mixing a soluble metal titanium salt and a polar non-aqueous solvent to obtain a solution of the soluble metal titanium salt; (2) adding a soluble metal lithium salt into the solution of the soluble metal titanium salt, which is obtained in the step (1), and uniformly mixing to obtain a mixed solution; and (3) adding water into the mixed solution obtained in the step (2), regulating a pH value to 9-14, carrying out complete reaction to obtain a Li4Ti5O12 precursor, annealing the Li4Ti5O12 precursor, and then naturally cooling to room temperature to obtain the Li4Ti5O12. The method can be used for synthesizing Li4Ti5O12 on a large scale and has the advantages of strong controllability, high repeatability and low cost, the obtained product has stable quality, and the Li4Ti5O12 can be used as the large-capacity energy-storage lithium ion battery cathode material.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method and application of a lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have many excellent features, such as the highest energy density, small self-discharge, long cycle life, and no memory effect. Therefore, it is not an exaggeration to say that lithium-ion batteries are currently the best secondary energy storage batteries in terms of overall performance. Anode materials are key materials for the development of lithium-ion batteries. [0003] At present, the commercialized C negative electrode material will form a passivation film on the carbon surface during the first charge and discharge, resulting in capacity loss; carbon material intercalation potential and Li + The deposition potential is close. When the battery is overcharged, metal lithium may be precipitated on the surface of the carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/485C01G23/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 郭玉国王永庆万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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