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TiO2 (B) negative electrode material as well as preparation method and application thereof

A technology of negative electrode material and titanium source, applied in the field of TiO2 negative electrode material and its preparation, can solve the problems of limited practical application, high production cost, complicated process, etc., and achieve the effects of good application value, low cost and high purity

Inactive Publication Date: 2019-11-12
SHENZHEN HYUTEEN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, artificially synthesized TiO 2 (B) often has defects such as low purity, high production cost, and complicated process, which limit its practical application. Therefore, low-cost synthesis of high-purity TiO 2 (B) of great significance

Method used

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  • TiO2 (B) negative electrode material as well as preparation method and application thereof
  • TiO2 (B) negative electrode material as well as preparation method and application thereof
  • TiO2 (B) negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of TiO 2 (B) the preparation method of negative electrode material, comprises the following steps:

[0039] S1. Mix 50mL of ethylene glycol with 2mL of tetrabutyl titanate, heat to reflux, add 3mL of water, stir for 30min, cool, add 150mL of acetone dropwise, stir for 30min, and obtain a white precipitate, wherein the speed of dropping acetone is 1mL / min, the heating and refluxing temperature is 200°C, and the heating and refluxing time is 1h;

[0040] S2. Wash the white precipitate described in S1 with ethanol and deionized water, dry it in vacuum, and calcinate to obtain the negative electrode material, wherein the drying temperature is 70° C., and the drying time is 12 hours. Calcination adopts segmental calcination, and the segmental Calcination includes the following steps:

[0041] S21. The calcination temperature in the front stage is 150°C, the heating rate is 5°C / min, and the holding time is 3h;

[0042] S22. The calcining temperature in the second s...

Embodiment 2～4

[0044] A kind of TiO 2 (B) The preparation method of the negative electrode material is basically the same as in Example 1, and the differences are shown in Table 1.

[0045] Table 1

[0046] project Pre-calcination temperature Front heating rate Post-calcination temperature Rear heating rate Example 2 100℃ 5℃ / min 400℃ 15℃ / min Example 3 200℃ 15℃ / min 700℃ 20℃ / min Example 4 300℃ 20℃ / min 500℃ 20℃ / min

Embodiment 5

[0048] A kind of TiO 2 (B) The preparation method of the negative electrode material is basically the same as that of Example 1, the difference being that the rate of dropping acetone in S1 is 30 mL / min.

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Abstract

The invention discloses a TiO2 (B) negative electrode material as well as a preparation method and an application thereof; the preparation method of the TiO2 (B) negative electrode material comprisesthe following steps of S1, mixing a solvent with a titanium source, carrying out heating and refluxing, adding water, cooling, and dropwise adding acetone to obtain a white precipitate; and S2, carrying out alcohol washing and / or water washing on the white precipitate in the step S1 and then performing vacuum drying and calcining to obtain the negative electrode material, wherein the calcining adopts segmented calcining. The first reversible capacity of the prepared negative electrode material is as high as 190 mAh / g or above, the first coulombic efficiency is higher than 82%, the capacity retention rate after being circulated for 200 cycles is 82-94%, and the negative electrode material has the advantages of high cycle performance and high specific capacity. The TiO2 (B) negative electrode material prepared by adopting a solvothermal method is high in purity, the preparation method is simple, the conditions are easy to control, the preparation period is short, the cost is low and theapplication value is high.

Description

technical field [0001] The present invention relates to the field of negative electrode materials, more specifically, relates to a kind of TiO 2 (B) Anode materials and their preparation methods and applications. Background technique [0002] With the rapid development of emerging economies, the world uses more and more energy, and energy is becoming more and more tense. Among them, lithium-ion batteries have been widely used in portable electronic devices such as computers, cameras, and mobile phones due to their high voltage, high energy density, long cycle life, good safety performance, and low cost. In recent years, countries around the world are actively carrying out research on the application of lithium-ion batteries to hybrid electric vehicles (HEV), pure electric vehicles (PEV), etc., but the main bottleneck of lithium-ion batteries as vehicle power batteries is the negative electrode material of lithium-ion batteries. performance. [0003] Compared with graphite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/0525
CPCH01M4/485H01M10/0525Y02E60/10
Inventor 肖佩豪杰王春歌王海帆
Owner SHENZHEN HYUTEEN NEW ENERGY CO LTD
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