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Carbon-coated metal sulfide electrode material, preparation method and application thereof

A metal sulfide and electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and rate performance of sodium ion batteries, achieve good sodium ion intercalation and extraction capabilities, simple preparation methods, slow down The effect of volume effect

Inactive Publication Date: 2015-06-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a carbon-coated metal sulfide electrode material and its preparation method and application, which effectively solve the problems of poor cycle performance and rate performance of sodium-ion batteries. Graphene's layered metal sulfide is used as the active material, and the non-graphitized carbon layer is used as the protective layer, which can effectively maintain the structure of the electrode material and improve the cycle performance of the electrode. It can obtain 300mAh g in the non-aqueous electrolyte sodium-ion battery -1 reversible capacity above

Method used

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  • Carbon-coated metal sulfide electrode material, preparation method and application thereof
  • Carbon-coated metal sulfide electrode material, preparation method and application thereof
  • Carbon-coated metal sulfide electrode material, preparation method and application thereof

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preparation example Construction

[0029] The preparation method of the carbon-coated metal sulfide electrode material of the present invention comprises the following steps:

[0030] (1) Cover the metal sulfide precursor on the nanowire template to form uniform and neatly dispersed nanoscale products.

[0031] (2) A uniform and dense carbon material film is covered on the surface of the metal sulfide.

[0032] (3) The nanowire template is removed to obtain a carbon-coated metal sulfide electrode material.

[0033] Step (1) adopts electrospinning method, spray method, sol-gel method, hydrothermal method, solvothermal method, co-precipitation method or impregnation method.

[0034] Wherein, when the step (1) adopts the hydrothermal method to prepare the metal sulfide, it specifically includes the following steps:

[0035] (1-1) After mixing the organic solvent (ethanol or acetone) and water at a volume ratio of 1:0~1, then add 1-butyl-3-methylimidazolium tetrafluoroboric acid at a volume ratio of 40:1~3 Salt ...

Embodiment 1

[0045] Preparation of carbon-coated MoS 2 (x=2) Electrode material, specifically including the following steps:

[0046] (1) MoS 2 The precursor covers the nanowire template to form uniform and neatly dispersed nanoscale products. Further include the following steps:

[0047] (1-1) After mixing water and ethanol at a volume ratio of 1:1, 1-butyl-3-methylimidazolium tetrafluoroborate and alumina nanowire templates are added at a volume ratio of 40:1 to obtain a mixed solvent.

[0048] (1-2) Dissolve 3.0g of ammonium heptamolybdate in 40mL of mixed solvent and stir for 30min to obtain solution ①. Add 2.8g of thiourea to 40mL of mixed solvent and stir for 1h to obtain solution ②.

[0049] (1-3) Mix solution ① and solution ②, stir for 30 minutes, transfer to a 100mL hydrothermal reaction kettle with a stainless steel shell and a polytetrafluoroethylene lining, blow nitrogen into it for 1 hour, seal the reaction kettle, and put the reaction The kettle was heated to 200°C, and ...

Embodiment 2

[0056] Preparation of carbon-wrapped MoS 3 (x=3) Electrode materials, specifically including the following steps:

[0057] (1) MoS 3 The precursor covers the nanowire template to form uniform and neatly dispersed nanoscale products. Further include the following steps:

[0058] (1-1) After mixing water and acetone at a volume ratio of 1:3, 1-butyl-3-methylimidazolium tetrafluoroborate and alumina nanowire templates are added at a volume ratio of 20:1 to obtain a mixed solvent.

[0059] (1-2) Dissolve 2.8g of ammonium heptamolybdate in 40mL of mixed solvent and stir for 30min to obtain solution ①. Add 4.2g of thiourea to 40mL of mixed solvent and stir for 1h to obtain solution ②.

[0060] (1-3) Mix solution ① and solution ②, stir for 30 minutes, transfer to a 100mL hydrothermal reaction kettle with a stainless steel shell and a polytetrafluoroethylene lining, blow nitrogen into it for 1 hour, seal the reaction kettle, and put the reaction The kettle was heated to 200°C, ma...

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Abstract

The invention discloses a carbon-coated metal sulfide electrode material, a preparation method and application thereof. The electrode material consists of hemisphere-like bilayer structure particles, the inner layer is a metal sulfide, and the outer layer is a carbon material. The hemisphere surface of the metal sulfide is coated by the carbon material, and the section is exposed. The general chemical formula of the metal sulfide is MSx, wherein M is one element from the fourth main group metal elements to the seventh main group metal elements, and x is greater than or equal to 1 and smaller than or equal to 3. The method includes the steps of: (1) covering a nanowire template with a metal sulfide precursor to form a uniformly and orderly dispersed nanoscale product; (2) covering the surface of the metal sulfide with a layer of uniform and dense carbon material film; and (3) removing the nanowire template so as to obtain the carbon-coated metal sulfide electrode material. The electrode material has stable structure and good cycle performance, and can acquire reversible capacity of more than 300mAh g<-1> in nonaqueous electrolyte sodium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials and secondary batteries, and more specifically relates to a carbon-coated metal sulfide electrode material and its preparation method and application. Background technique [0002] In recent years, since large-capacity lithium-ion batteries are regarded as the main choice for large-scale energy storage such as electric vehicles and energy storage power stations in the future, their application research continues to increase, and there are higher requirements for the performance of lithium-ion batteries. With the increasing application research fields of lithium-ion batteries, the demand for lithium resources has also become one of the focuses of people's attention. In order to solve these problems, countries around the world are also actively developing lithium-ion batteries with better performance and secondary batteries with similar characteristics. [0003] Sodium metal is the...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 朱华平张五星孙盼玲黄云辉袁利霞胡先罗沈越
Owner HUAZHONG UNIV OF SCI & TECH
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