Preparation method for hollow micro-structure Co3S4@MoS2 of lithium ion battery negative electrode by MOF template

A lithium ion battery, hollow micro technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of volume change, large dissolved polysulfide, unsatisfactory cycle stability, and slow Li ion diffusion. , to achieve the effect of solving capacity attenuation, high success rate and easy operation

Inactive Publication Date: 2018-11-23
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

But in reality, they are very easy to stack/re-stack into bulk materials, especially in the limited space for Li-ion storage at high rates
MoS 2 The biggest problem of nanosheets for flexible LIBs is that its realization

Method used

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  • Preparation method for hollow micro-structure Co3S4@MoS2 of lithium ion battery negative electrode by MOF template
  • Preparation method for hollow micro-structure Co3S4@MoS2 of lithium ion battery negative electrode by MOF template
  • Preparation method for hollow micro-structure Co3S4@MoS2 of lithium ion battery negative electrode by MOF template

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Embodiment 1

[0044] Cobalt nitrate hexahydrate (8.7364 g) was added to 300 mL of methanol respectively to form a solution and shaken for 3 minutes. 2-Methylimidazole (9.8430 g) was added to 100 mL of methanol to form a solution and shaken for 3 minutes. The two solutions were then mixed and treated with ultrasound (40000 Hz) for 10 minutes. The mixed solution was left at room temperature for 12 hours to obtain precipitation. Next, the precipitate was collected, separated by centrifugation, washed 5 times with methanol, and dried overnight at 80 °C to obtain the ZIF-67 precursor template.

[0045] Add 400 mg ZIF-67 precursor template and 200 mg dopamine into 500 mL Tris buffer solution (pH = 8, 10 mM) and stir for 5 h. The precipitate was collected by centrifugation, washed several times with deionized water and ethanol, and dried at 70 °C to obtain ZIF-67@PDA nanocubes. Finally, the ZIF-67@PDA nanocubes were annealed at 600 °C for 2 hours under Ar conditions, and the Co 3 o 4 @C sampl...

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Abstract

The invention relates to the technical field of preparation of a nanometer material, in particular to a preparation method for a hollow micro-structure Co3S4@C@MoS2 of a lithium ion battery negative electrode by an MOF template. The method comprises the following steps of (1) preparing a ZIF-67 precursor template by a solution method; (2) coating the prepared ZIF-67 template with organic carbon ina solution; (3) performing high-temperature sintering on a product in an atmosphere furnace; (4) dispersing the sintered product in a salt solution; (5) performing hydrothermal reaction on a mixed solution, and collecting the product; (6) annealing the product to prepare a hollow Co3S4@C@MoS2-heterojunction structure. The method is simple, is convenient to operate, and is good in repeatability and high in product purity; and the prepared hollow Co3S4@C@MoS2-heterojunction structure has favorable performance when used as a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a hollow microstructure Co 3 S 4 @C@MoS 2 method of preparation. Background technique [0002] Transition metal chalcogenides (such as SnS, MoS 2 , FeS 2 and CoS 2 ) as a promising class of anode materials with high theoretical capacity to store Li / Na ions via an electrochemical conversion mechanism. Transition metal chalcogenides generally have more favorable kinetics and higher initial Coulombic efficiencies than metal oxides compared to Mo bonds due to relatively weak ionic bonds. Among these metal chalcogenides, cobalt sulfides (such as CoS, CoS 2 ,Co 9 S 8 and Co 3 S 4 ) has received increasing attention, although most studies have focused on potential applications in Li / Na-ion batteries and supercapacitors. In fact, despite the high theoretical Li-ion storage capacity of cobalt sulfide, the cycle stability and rate performance are unsatisf...

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 姚卫棠戴金延张群斌刘小楠李节节
Owner SOUTHWEAT UNIV OF SCI & TECH
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