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Method for modifying titanium-dioxide lithium-ion battery negative pole material simultaneously by using carbon and monolayer molybdenum disulfide

A single-layer molybdenum disulfide and lithium-ion battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low storage capacity and poor conductivity, and achieve simple reaction, inhibition of agglomeration, and high specific capacity Effect

Inactive Publication Date: 2016-10-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 It also faces many problems, such as poor electrical conductivity and low storage capacity. Therefore, increasing TiO 2 The electronic conductivity, lithium ion diffusion capacity and storage capacity of negative electrode materials are the key to the further promotion and application of this material

Method used

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  • Method for modifying titanium-dioxide lithium-ion battery negative pole material simultaneously by using carbon and monolayer molybdenum disulfide
  • Method for modifying titanium-dioxide lithium-ion battery negative pole material simultaneously by using carbon and monolayer molybdenum disulfide
  • Method for modifying titanium-dioxide lithium-ion battery negative pole material simultaneously by using carbon and monolayer molybdenum disulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 12.5ml of butyl titanate and 1.5ml of hydrofluoric acid (40wt%) were added to a 50ml reaction kettle, and placed in a thermostat for hydrothermal heating at 200°C for 24h. After the reaction is over, it is naturally cooled to room temperature, the obtained suspension is centrifuged with alcohol and deionized water, and the bottom powder is collected and heated to dry to obtain a white powder. Weigh 200 mg of the obtained white powder, 100 mg of glucose, 20 mg of ammonium molybdate, and 22.8 mg of thiourea, and sequentially add them to 200 ml of deionized water to obtain a uniform suspension. Put the mixed suspension in a freezer, freeze and place it in a freeze dryer at -50°C for freeze drying until it is dried to obtain a mixture. Grind the obtained precursor to fine powder, spread it flat in the ark and place it in a tube furnace. Inject 200ml / min of argon inert gas for 20 minutes to remove the air in the tube furnace, and then set it at 10℃ / min The temperature is inc...

Embodiment 2

[0026] 10.5ml of butyl titanate and 1.5ml of hydrofluoric acid (40wt%) were added to a 50ml reaction kettle, and placed in a thermostat for water heating at 180°C for 22h. After the reaction is over, it is naturally cooled to room temperature, the obtained suspension is centrifuged with alcohol and deionized water, and the bottom powder is collected and heated to dry to obtain a white powder. Weigh 180 mg of the obtained white powder, 50 mg of glucose, 20 mg of ammonium molybdate, and 21 mg of thiourea, and sequentially add 200 ml of deionized water to obtain a uniform suspension. Put the mixed suspension in a freezer, freeze and place it in a freeze dryer at -50°C for freeze drying until it is dried to obtain a mixture. Grind the obtained precursor to fine powder, spread it flat in an ark and place it in a tube furnace. Inject 200ml / min of argon inert gas for 20 minutes to remove the air in the tube furnace, and then use 2℃ / min The temperature was raised to 700℃ and kept for ...

Embodiment 3

[0028] 13.5ml of butyl titanate and 1.5ml of hydrofluoric acid (40wt%) were added to a 50ml reactor, and placed in a thermostat for hydrothermal heating at 220°C for 26h. After the reaction is over, it is naturally cooled to room temperature, the obtained suspension is centrifuged with alcohol and deionized water, and the bottom powder is collected and heated to dry to obtain a white powder. Weigh 240 mg of the obtained white powder, 150 mg of glucose, 20 mg of ammonium molybdate, and 25 mg of thiourea, and sequentially add them to 200 ml of deionized water to obtain a uniform suspension. Put the mixed suspension in a freezer, freeze and place it in a freeze dryer at -50°C for freeze drying until it is dried to obtain a mixture. Grind the obtained precursor to fine powder, spread it flat in the ark and place it in a tube furnace. Inject 200ml / min of argon inert gas for 20 minutes to remove the air in the tube furnace, and then set it at 10℃ / min The temperature was raised to 90...

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Abstract

The invention relates to a method for modifying a titanium-dioxide lithium-ion battery negative pole material simultaneously by using carbon and monolayer molybdenum disulfide. According to the method, a composite material adopts TiO2 as a skeleton, fluoride ions of the surface of the composite material adsorb glucose molecules in a suspension firstly, functional groups in the glucose molecules adsorb molybdate ions and thiourea molecules, an outer layer of each titanium dioxide nanosheet is coated with a glucose membrane and a sodium molybdate-thiourea membrane after freeze drying, glucose is carbonized into amorphous carbon after a chemical vapor deposition process, and meanwhile, thiourea is subjected to high-temperature decomposition so as to prepare hydrogen sulfide and reduce the molybdate ions into molybdenum disulfide, thereby obtaining TiO2 nanosheets which are simultaneously modified by carbon and monolayer molybdenum disulfide nanosheets. The prepared negative pole material has a uniformly-coated structure, all components are in close contact, and the agglomeration of MoS2 nanosheets is effectively inhibited; when the prepared negative pole material is applied to negative pole materials of lithium-ion batteries, the lithium-ion batteries have relatively high specific capacity and stable cycle performance.

Description

Technical field [0001] The invention relates to a technology for preparing a titanium dioxide lithium ion battery negative electrode material with carbon and a single-layer molybdenum disulfide nanosheet modified simultaneously by a chemical vapor deposition method. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density and long cycle life, and are widely used in electronic devices such as mobile phones and notebook computers. Currently, the anode material widely used in lithium-ion batteries is the traditional graphite material. However, carbon-based materials such as graphite have low coulombic efficiency for the first time, which easily leads to the co-intercalation of electrolyte solvent ions, and the operating voltage is low. Lithium dendrites are easily generated during multiple charge and discharge processes, which poses greater safety risks. Compared with traditional graphite anode materials, anatase titanium dioxide (TiO 2 )...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 师春生逯慧慧赵乃勤刘恩佐何春年
Owner TIANJIN UNIV
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