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Molybdenum telluride positive electrode material for lithium-ion battery and preparation method of molybdenum telluride positive electrode material

A lithium ion battery and anode material technology, which is applied in the field of lithium ion battery molybdenum telluride anode materials and their preparation, and can solve the problems of poor cycle performance, poor rate performance of anode materials and the like

Active Publication Date: 2018-04-17
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above technical deficiencies, provide a molybdenum telluride anode material for lithium ion batteries, and solve the technical problems of poor rate performance and poor cycle performance of lithium ion battery anode materials in the prior art

Method used

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  • Molybdenum telluride positive electrode material for lithium-ion battery and preparation method of molybdenum telluride positive electrode material

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[0015] This embodiment also provides a method for preparing a molybdenum telluride anode material for a lithium-ion battery. molybdenum anode material.

[0016] Specifically, it also includes the step of preparing 1T' type molybdenum ditelluride crystal:

[0017] 1) Mix molybdenum powder and tellurium powder according to the molar ratio of 1:2, and fire at 800-1000°C for 72-168 hours under vacuum to obtain molybdenum ditelluride polycrystalline powder;

[0018] 2) Mixing the polycrystalline molybdenum ditelluride powder and tellurium tetrachloride at 800-1000°C, firing for 72-168 hours, and then recrystallizing by chemical vapor phase transfer to obtain molybdenum ditelluride crystals;

[0019] 3) Quenching the molybdenum ditelluride crystal in cold water to obtain 1T' type molybdenum ditelluride crystal.

[0020] Specifically, the rotation speed in the ball mill is 300-600 rpm, and the time is 12-48 hours.

[0021] Specifically, the mass concentration of tellurium tetrachl...

Embodiment 1

[0027] This implementation provides a molybdenum telluride anode material for a lithium ion battery, which includes a 1T' type molybdenum ditelluride crystal and graphene coated on the outer surface of the 1T' type molybdenum ditelluride crystal, and the graphene is The mass ratio in the molybdenum anode material is 10%. This embodiment also provides a method for preparing a molybdenum telluride anode material for a lithium ion battery, specifically as follows:

[0028] 1) Mix molybdenum powder and tellurium powder into the silicon ampoule at a molar ratio of 1:2, seal the silicon ampoule with a rotary vacuum sealing system, and heat to 800°C for 72 hours to obtain molybdenum ditelluride polycrystalline powder ;

[0029] 2) The molybdenum ditelluride polycrystalline powder and mass concentration obtained in step 1) are 2.7mg.ml -1 Add tellurium tetrachloride into a silicon ampoule and mix, heat to 900°C and burn for 100 hours, then recrystallize by chemical vapor phase trans...

Embodiment 1

[0035]Table 1 Example 1 lithium-ion battery capacity test

[0036] battery number

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Abstract

The invention provides a molybdenum telluride positive electrode material for a lithium-ion battery. The molybdenum telluride positive electrode material comprises 1T'-type molybdenum ditelluride crystal and a conductive material coating the outer surface of the 1T'-type molybdenum ditelluride crystal, and the mass percent of the conductive material in the molybdenum telluride positive electrode material is 5-15%. If the mass percent of the conductive material in the molybdenum telluride positive electrode material is smaller than 5%, reunion of the 1T'-type molybdenum ditelluride crystal is caused; if the mass percent of the conductive material in the molybdenum telluride positive electrode material is greater than 15%, the 1T'-type molybdenum ditelluride crystal cannot fully develop excellent electrochemical properties; and the conductive material coats the 1T'-type molybdenum ditelluride crystal and the mass percent of the conductive material in the molybdenum telluride positive electrode material is 5-15%, so that the molybdenum telluride positive electrode material for the lithium-ion battery has excellent rate capability and good cycle performance. The invention further provides a preparation method of the molybdenum telluride positive electrode material for the lithium-ion battery. The preparation method is simple in process, environment-friendly and efficient.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, more specifically, the invention relates to a molybdenum telluride anode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronics and hybrid vehicles. In the past two decades, graphite has been widely used as a standard anode material in lithium-ion batteries because of its wide source and stable cycle performance. However, to date, graphite-based batteries suffer from poor rate performance and low theoretical specific capacity (372mAh g -1 ) cannot meet the needs of the current market. The search for anode materials with high capacity, high Coulombic efficiency, and excellent rate capability is paramount for lithium-ion batteries. [0003] In recent years, two-dimensional layered transition metal dichalcogenides (TMDCs) nanocrystals have been gradually developed and used as an...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/581H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 邓飞马宁蔡芳昌江泰槿
Owner YANGTZE UNIVERSITY
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