A method for preparing titanium-silicon polymer oxide composite lithium-ion battery negative electrode material by thermal decomposition of organic titanium-silicon polymer

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of insignificant volume change, low initial charge and discharge efficiency, loss of specific capacity of materials, etc., to overcome the poor rate performance Good, improved cycle stability, excellent electrochemical performance

Active Publication Date: 2022-07-01
ZHEJIANG FOLTA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As the negative electrode material of lithium batteries, elemental silicon has a high theoretical specific capacity (4200mAh / g), and the geological reserves of silicon are abundant, and silicon is non-toxic and less harmful to the environment. Therefore, as electronic equipment, portable equipment and power batteries With the growth of demand, silicon anode materials have attracted more and more attention. However, the disadvantages of silicon anode materials are instability, volume expansion, low initial charge and discharge efficiency, and low power density.
These disadvantages hinder its practical application, such as volume expansion, which almost reaches 300~400% of its initial volume during charging / discharging
[0005] TiO 2 The volume change is not obvious during the charge and discharge process (such as anatase is less than 4%), which makes it suitable for energy storage devices that require long cycle life. However, TiO 2 The conductivity is poor and the theoretical capacity is low (335mAh / g), which seriously hinders Li + in TiO 2 Intra-lattice intercalation and deintercalation, resulting in reduced utilization of active sites in the lattice and loss of specific capacity of the material

Method used

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  • A method for preparing titanium-silicon polymer oxide composite lithium-ion battery negative electrode material by thermal decomposition of organic titanium-silicon polymer
  • A method for preparing titanium-silicon polymer oxide composite lithium-ion battery negative electrode material by thermal decomposition of organic titanium-silicon polymer
  • A method for preparing titanium-silicon polymer oxide composite lithium-ion battery negative electrode material by thermal decomposition of organic titanium-silicon polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Titanium silicon polymer oxide Ti n Si (1-n) O 2 - Preparation of anode material for CNT lithium ion battery

[0031] Add 0.7500g of carbon nanotube powder to the reaction kettle, then add 42.0g of anhydrous ethylene glycol (as a reactant and solvent in this example), stir evenly on a magnetic stirrer, close the lining of the reaction kettle, and send into the glove box. Then add 3.47g of tetrapropoxysilicon dropwise, add slowly while magnetically stirring, and then add 10.67g of isopropyl titanate dropwise, add 0.10g of isopropyl titanate dropwise, and then add 0.10g Finally, take out the glove box under the condition of stirring evenly, and tighten the reaction kettle. Put it into a homogeneous reactor, set the reaction temperature to 140°C, take out the reactor after 6 hours of reaction, cool it to room temperature at room temperature, remove the reaction mixture, wash the reactor three times with ethanol and combine the washed mixture with the reaction mixtu...

Embodiment 2

[0038] (1) Comparative material SiO x - Preparation of CNTs

[0039] Add 0.7500g of carbon nanotube powder to the reaction kettle, then add 42.0g of anhydrous ethylene glycol (as a reactant and solvent in this example), stir evenly on a magnetic stirrer, close the lining of the reaction kettle, and send into the glove box. Then add 3.47g of tetrapropoxysilicon dropwise, add slowly and magnetically stir, wait for the mixing to be uniform, then add 0.10g of cetyldimethylamine, and finally take out the glove box under the condition of uniform stirring , tighten the reactor. Put it into a homogeneous reactor, set the reaction temperature to 140 °C, take out the reaction kettle after 6 hours of reaction, cool it to room temperature, transfer the reaction mixture, wash the reaction kettle three times with 10 ml of ethanol respectively, combine the washings into the reaction mixture, extract The solid filter cake was obtained by filtration and separation, and the filter cake was t...

Embodiment 3

[0043] (1) Comparative material TiO y- Preparation of CNTs

[0044] Add 0.7503g of carbon nanotube powder to the reaction kettle, then add 42g of anhydrous ethylene glycol (as a reactant and solvent in this example), stir evenly on a magnetic stirrer, close the lining of the reaction kettle, and send inside the glove box. Then add 10.67g of isopropyl titanate dropwise, add slowly and magnetically stir, and then add 0.10g of cetyldimethylamine after mixing evenly, finally take out the glove box after stirring evenly, and tighten the reaction kettle . Put it into a homogeneous reactor, set the reaction temperature to 140°C, take out the reaction kettle after 6 hours of reaction, cool it to room temperature, transfer the reaction mixture, wash the reaction kettle three times with 10 ml of ethanol, combine the washings into the reaction mixture, extract The solid filter cake was obtained by filtration and separation, and the filter cake was taken and placed in a blast drying ov...

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Abstract

The invention discloses a method for preparing a negative electrode material of a titanium-silicon polymer oxide composite lithium ion battery by thermal decomposition of an organic titanium-silicon polymer, which comprises the following steps: (1) carbon nanotubes (CNT), a solvent, an organic binary After mixing alcohol, silicon orthoester and titanium orthoester, organic amine is added as a catalyst to fully stir to obtain a mixed slurry M; (2) the mixed slurry M is put into a reaction kettle and fully reacted at a certain temperature, and then solidified. Liquid separation, take the solid, and then dry the obtained solid to obtain the precursor S; (3) calcine the precursor S under the protection of inert gas to obtain Ti n Si (1‑n) O 2 ‑CNT composite lithium-ion battery anode material. Ti prepared by the method of the present invention n Si (1‑n) O 2 ‑CNT composite lithium-ion battery anode material has the characteristics of good rate performance, high cycle stability and high specific capacity.

Description

technical field [0001] The invention relates to a kind of preparation of titanium-silicon polymer oxide Ti from organic titanium-silicon polymer thermal decomposition n Si (1-n) O 2 -The method of CNT composite lithium ion battery negative electrode material, and use the material as the negative electrode material of lithium ion battery. Background technique [0002] With the development of society and the increase of human demand for energy consumption, batteries, as an important part of the new energy field, have become a new hot spot in global economic development. Lithium-ion batteries have been widely used as an important energy storage device. Whether it is in the field of electronic communication or in the field of transportation, it plays an extremely important role and has a wide range of application prospects. [0003] As an important energy storage device, lithium-ion battery is required to have high energy density and power density, and the key factor affectin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/386H01M4/483H01M4/625H01M4/628H01M4/366H01M10/0525H01M2004/027Y02E60/10
Inventor 张文山其他发明人请求不公开姓名
Owner ZHEJIANG FOLTA TECH CO LTD
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