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Method for preparing titanium-silicon polymerized oxide composite lithium ion battery negative electrode material through 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 first charge and discharge efficiency, material specific capacity loss, etc. good performance, improved cycle stability, and excellent electrochemical performance

Active Publication Date: 2020-11-10
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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  • Method for preparing titanium-silicon polymerized oxide composite lithium ion battery negative electrode material through thermal decomposition of organic titanium-silicon polymer
  • Method for preparing titanium-silicon polymerized oxide composite lithium ion battery negative electrode material through thermal decomposition of organic titanium-silicon polymer
  • Method for preparing titanium-silicon polymerized oxide composite lithium ion battery negative electrode material through thermal decomposition of organic titanium-silicon polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Titanium-silicon polymerized oxide Ti n Si (1-n) o 2 - Preparation of CNT lithium ion battery anode material:

[0031] Add 0.7500g carbon nanotube powder in reactor, then add the anhydrous ethylene glycol of 42.0g (as reactant and solvent in this example), stir evenly on magnetic stirrer, cover tightly reactor lining, send into the glove box. Then add 3.47g of tetrapropoxy silicon dropwise, while slowly adding, while stirring magnetically, after fully mixing, then add 10.67g of isopropyl titanate dropwise, stir while adding, and then add 0.10g cetyl dimethylamine, and 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 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 mixture ...

Embodiment 2

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

[0039] Add 0.7500g carbon nanotube powder in reactor, then add the anhydrous ethylene glycol of 42.0g (as reactant and solvent in this example), stir evenly on magnetic stirrer, cover tightly reactor lining, send into the glove box. Then add 3.47g of tetrapropoxysilane drop by drop, add slowly while stirring magnetically, wait until the mixture is uniform, then add 0.10g of hexadecyldimethylamine, and finally take out the glove box while stirring evenly , Tighten the reactor. Put it into a homogeneous reactor, set the reaction temperature to 140°C, take out the reaction kettle after reacting for 6 hours, cool to room temperature, transfer the reaction mixture, wash the reaction kettle with 10ml of ethanol three times, combine the washings into the reaction mixture, and pump The solid filter cake was collected by filtration, and the filter cake was placed in a blast drying oven and dried at 90°C. The dried mater...

Embodiment 3

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

[0044] Add 0.7503g of carbon nanotube powder in the reactor, then add 42g of anhydrous ethylene glycol (as reactant and solvent in this example), stir evenly on a magnetic stirrer, cover the inner liner of the reactor tightly, and send it into Inside the glove box. Then add 10.67g of isopropyl titanate drop by drop, and magnetically stir while slowly adding, and then add 0.10g of hexadecyldimethylamine after mixing evenly, and finally take out the glove box after stirring evenly, and tighten the reactor . Put it into a homogeneous reactor, set the reaction temperature to 140°C, take out the reaction kettle after reacting for 6 hours, cool to room temperature, transfer the reaction mixture, wash the reaction kettle three times with 10ml of ethanol, and combine the washings into the reaction mixture. Separation by suction filtration to take the solid filter cake, put the filter cake in a blast drying oven, and dry ...

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Abstract

The invention discloses a method for preparing a titanium-silicon polymer oxide composite lithium ion battery negative electrode material through thermal decomposition of an organic titanium-silicon polymer. The method comprises the following steps of (1) mixing carbon nanotubes (CNT), a solvent, organic dihydric alcohol, orthosilicate and orthotitanate, adding organic amine as a catalyst, and sufficiently stirring to obtain mixed slurry M; (2) putting the mixed slurry M into a reaction kettle, fully reacting at a certain temperature, carrying out solid-liquid separation, taking a solid, and drying the obtained solid to obtain a precursor S; and (3) calcining the precursor S under the protection of inert gas to obtain the TinSi (1-n) O2-CNT composite lithium ion battery negative electrodematerial. The TinSi (1-n) O2-CNT composite lithium ion battery negative electrode material prepared by the method has the characteristics of good rate capability, high cycling stability and high specific capacity.

Description

technical field [0001] The invention relates to a method for preparing titanium-silicon polymerized oxide Ti from thermal decomposition of organic titanium-silicon polymer n Si (1-n) o 2 -A method for the negative electrode material of the CNT composite lithium ion battery, and using the material as the negative electrode material of the 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 focus of global economic development. Lithium-ion battery has 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 broad application prospects. [0003] As an important energy storage device, lithium-ion batteries are required to have high energy density and power density, and the key factors...

Claims

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Application Information

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Patent Type & Authority Applications(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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