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Nano MoO2-MoSe2@SFC lithium ion battery negative electrode material and preparation method therefor

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., to achieve good cycle stability and rate performance, improve specific capacity, and excellent electrochemical characteristics

Active Publication Date: 2016-03-23
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For molybdenum selenide, most of the current research focuses on the synthesis of two-dimensional layered molybdenum selenide, but there are few reports on three-dimensional molybdenum selenide

Method used

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  • Nano MoO2-MoSe2@SFC lithium ion battery negative electrode material and preparation method therefor
  • Nano MoO2-MoSe2@SFC lithium ion battery negative electrode material and preparation method therefor
  • Nano MoO2-MoSe2@SFC lithium ion battery negative electrode material and preparation method therefor

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Embodiment

[0022] (1) Obtaining sisal fiber carbon: Carbonize the pretreated sisal fiber in a tubular atmosphere furnace, ball mill, and sieve. The heating rate is 3°C / min, the carbonization temperature is 900°C, and the holding time is 0.5 hours. , the ball milling rate is 400r / min, the ball milling time is 12 hours, and the sieve aperture is 0.074mm (200 mesh sieve).

[0023] (2) Configuration solution: Add 1.56g of ammonium molybdate tetrahydrate and 0.14g of selenium dioxide (selenium: molybdenum = 1:1) into 70mL of deionized water. When a colorless and transparent solution is formed, add 0.64g of the step ( 1) After stirring the obtained sisal fiber charcoal for 20 minutes, add 1 mL of analytically pure polyethylene glycol 400, continue stirring for 20 minutes, add 5 mL of hydrazine hydrate with a concentration of 80% by mass, and continue stirring overnight. This suspension is designated as A suspension.

[0024] (3) Hydrothermal reaction: transfer the A suspension into a stainles...

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Abstract

The invention discloses a nano MoO2-MoSe2@SFC lithium ion battery negative electrode material and a preparation method therefor. A nano MoO2-MoSe2@SFC composite material takes sisal fiber carbon (SFC) with a hierarchical pore-shaped structure as a substrate material, and MoO2 and MoSe2 are uniformly dispersed in the surface and pores of the SFC. Ammonium molybdate tetrahydrate, ammonium molybdate dehydrate or molybdenum dioxide is taken as a molybdenum source; selenium dioxide, sodium selenite or selenium powder is taken as a selenium source; carbonized, ball-milled and sieved SFC is taken as a substrate material; hydrazine hydrate and polyethylene glycol 400 are used as a reductant and a dispersant respectively; a hydrothermal reaction is performed by utilizing a high-pressure reaction kettle; and dispersoid materials with different particle sizes can be obtained by changing different reaction conditions. The obtained nano MoO2-MoSe2@SFC composite powder is relatively high in reversible capacity, relatively stable in cyclic performance and relatively high in charging / discharging rate performance when being used as the lithium ion battery negative electrode material, so that the nano MoO2-MoSe2@SFC composite powder has relatively good application prospects.

Description

technical field [0001] The invention belongs to the field of new materials and electrochemistry, and in particular relates to a preparation method of a negative electrode material of a rechargeable and dischargeable lithium ion battery. Background technique [0002] At present, under the pressure of the environment, lithium-ion batteries, energy storage devices, are gradually occupying the consumer market and expanding their application fields. In addition to some smart and portable electronic devices, the application of some large-scale equipment such as electric vehicles and electric vehicles is also increasing. At the same time, higher requirements are placed on the lithium storage performance of lithium-ion batteries. Anode materials are an important part of lithium-ion batteries, and researchers are more inclined to explore carbon-based anode materials. For the consideration of the environment and its natural beneficial physical and chemical properties, some researcher...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M4/587H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/48H01M4/581H01M4/587H01M10/0525Y02E60/10
Inventor 覃爱苗田宁廖雷王美苹
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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