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Preparation method and application of graphene@molybdenum diselenide@SnS heterogeneous interface composite material

A composite material and heterogeneous interface technology, applied in the field of electrochemistry, can solve the problems of volume expansion and low conductivity, and achieve the effects of large output, high specific capacity and low cost

Active Publication Date: 2020-11-10
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low electrical conductivity and serious volume expansion of the existing transition metal selenide as the negative electrode material of the battery, and to provide a preparation method of graphene@molybdenum diselenide@SnS heterogeneous interface composite material and application

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  • Preparation method and application of graphene@molybdenum diselenide@SnS heterogeneous interface composite material

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specific Embodiment approach 1

[0032] Specific implementation mode 1: This implementation mode is a preparation method of graphene@molybdenum diselenide@SnS heterogeneous interface composite material, which is completed according to the following steps:

[0033] 1. Preparation of graphene@MoSe 2 Composite material:

[0034] ①, the Na 2 MoO 4 2H 2 O dissolved in deionized water, followed by sonication, yielded Na 2 MoO 4 solution;

[0035] Na mentioned in step ① 2 MoO 4 2H 2 The mass ratio of O to the volume of deionized water is (0.2g~0.6g):20mL;

[0036] ②, the selenium powder is dispersed in the hydrazine to obtain the selenium powder hydrazine dispersion;

[0037] The mass of the selenium powder described in step 2. is (0.3g~0.5g):10mL with the volume ratio of hydrazine;

[0038] ③. Add the selenium powder hydrazine dispersion to Na 2 MoO 4 solution to obtain mixed solution I; add graphite oxide aqueous solution to mixed solution I, mix evenly, and then ultrasonically disperse to obtain mixe...

specific Embodiment approach 2

[0054] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the concentration of the graphite oxide aqueous solution described in Step 1 ③ is 4 mg / L-6 mg / L. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0055] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the ultrasonic time described in step ① is 20 min-40 min, and the ultrasonic power is 20W-40W. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method and application of a graphene@molybdenum diselenide@SnS heterogeneous interface composite material, belongs to the field of electrochemistry and the fieldof micro-nano technologies, and particularly relates to a preparation method and application of the graphene@MoSe2@SnS heterogeneous interface composite material. The invention aims to solve the problems of low conductivity and serious volume expansion of the existing transition metal selenide serving as a negative electrode material of a battery. The method comprises the following steps: 1, preparing a graphene@MoSe2 composite material; 2, preparing the graphene@MoSe2@SnS heterogeneous interface composite material. The graphene@MoSe2@SnS heterogeneous interface composite material is applied as a lithium ion battery negative electrode material. According to the invention, the graphene@MoSe2@SnS heterogeneous interface composite material can be obtained.

Description

technical field [0001] The field of electrochemistry and micro-nano technology of the present invention specifically relates to a kind of graphene@MoSe 2 Preparation methods and applications of @SnS heterointerface composites. Background technique [0002] Compared with commercial graphite anode materials (theoretical specific capacity 372mAh g -1 ), transition metal selenide MSe 2 (M=Mo, W, V) has become a hotspot in the research of lithium / potassium ion battery anodes because of its two-dimensional layered structure, high theoretical specific capacity and large interlayer spacing. MSe 2 The high theoretical specific capacity is mainly due to its combination with Li + / K + Intercalation reactions and conversion reactions occur, and compared with the M-O bonds of metal oxides, the M-Se bonds are weaker, which is very conducive to the occurrence of intercalation reactions and conversion reactions. in MSe 2 In the structural unit, the Se-M-Se interlayers are combined by...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/364H01M4/58H01M4/5815H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 王秀娟何晓明
Owner SHAANXI NORMAL UNIV
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