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A molybdenum disulfide matrix composite material for negative electrode of lithium ion capacitor and preparation method thereof

A technology of molybdenum disulfide and composite materials, which is applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of limited ion diffusion depth and poor conductivity, and achieve low price and large layer Spacing, environmental friendly effect

Active Publication Date: 2019-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome existing MoS 2 Electrode materials have poor interlayer conductivity and limited ion diffusion depth defects during charge and discharge. Provide a phosphorus and polyaniline co-doped 1T / 2H hybrid phase molybdenum disulfide-reduced graphene oxide composite material and its preparation method

Method used

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  • A molybdenum disulfide matrix composite material for negative electrode of lithium ion capacitor and preparation method thereof
  • A molybdenum disulfide matrix composite material for negative electrode of lithium ion capacitor and preparation method thereof
  • A molybdenum disulfide matrix composite material for negative electrode of lithium ion capacitor and preparation method thereof

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Embodiment 1

[0047] A method for preparing a molybdenum disulfide-based composite material for a lithium ion capacitor negative electrode, comprising the following steps:

[0048] (1) Ultrasonic disperse 100mg graphene oxide in 100ml deionized water to obtain a graphene oxide suspension; disperse 0.22g red phosphorus in 140ml deionized water and ultrasonically 5h to obtain a phosphorus dispersion; 1.65g molybdenum tetrahydrate Ammonium phosphate and 1.75g ​​aniline were dissolved in the phosphorus dispersion to obtain a mixed solution; the graphene oxide suspension was added to the mixed solution, and 1mol / L HCl solution was added dropwise under stirring to adjust the pH of the solution to 4.0. Under reaction for 5h, P / Mo 3 o 10 (C 6 h 5 NH 3 ) 2 4H 2 O / graphene oxide precursor;

[0049] (2) 1.35g P / Mo 3 o 10 (C 6 h 5 NH 3 ) 2 4H 2 O / graphene oxide precursor and 2.4g potassium persulfate were dispersed in 100ml and 60ml deionized water respectively, and then the pH of the abo...

Embodiment 2

[0052] A method for preparing a molybdenum disulfide-based composite material for a lithium ion capacitor negative electrode, comprising the following steps:

[0053] (1) Ultrasonic disperse 300mg graphene oxide in 100ml deionized water to obtain a graphene oxide suspension; disperse 0.22g red phosphorus in 140ml deionized water and ultrasonically 5h to obtain a phosphorus dispersion; 1.65g molybdenum tetrahydrate Ammonium phosphate and 1.75g ​​aniline were dissolved in the phosphorus dispersion to obtain a mixed solution; the graphene oxide suspension was added to the mixed solution, and 1mol / L HCl solution was added dropwise under stirring to adjust the pH of the solution to 4.0. Under reaction for 5h, P / Mo 3 o 10 (C 6 h 5 NH 3 ) 2 4H 2 O / graphene oxide precursor;

[0054] (2) 1.35g P / Mo 3 o 10 (C 6 h 5 NH 3 ) 2 4H 2 O / graphene oxide precursor and 2.4g potassium persulfate were dispersed in 100ml and 60ml deionized water respectively, and then the pH of the abo...

Embodiment 3

[0058] The molybdenum disulfide-based composite material (P-MoS 2 / PANI / rGO composite material) preparation method, except that pH is 5.0 in step (1), all the other are identical with embodiment 2.

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Abstract

The invention belongs to the technical field of lithium ion capacitors, and discloses a molybdenum disulfide-based composite material for a negative electrode of a lithium ion capacitor and a preparation method thereof. The method includes: (1) Ammonium molybdate tetrahydrate or ammonium molybdate, aniline, phosphorus and graphene oxide were mixed uniformly in water; the pH value of the reaction system is adjusted to 4-5, the reaction temperature is kept to obtain the precursor; (2) the precursor reacts under acidic condition and initiator to obtain intermediate product; Acidic condition refers to pH 1.7 - 2.3 of the reaction solution; 3) dispering that intermediate product and thiourea in water, and place the intermediate product and thiourea in a hydrothermal reaction device for hydrothermal reaction to obtain molybdenum disulfide matrix composite material. The method of the invention is simple and efficient. As that composite material obtain has excellent electrochemical propertiesand cycle stability, the composite material has excellent lithium storage performance in a lithium ion capacitor negative electrode material, and has wide application prospect in a lithium ion capacitor.

Description

technical field [0001] The invention belongs to the technical field of lithium ion capacitors, and in particular relates to a molybdenum disulfide-based composite material for negative electrodes of lithium ion capacitors and a preparation method thereof. Background technique [0002] MoS 2 With a graphite-like layered structure, when used as a lithium-ion capacitor anode material, MoS 2 Through the electric double layer capacitance at the interface between the sheets and the electrolyte, the reversible intercalation and extraction of electrolyte ions between the sheets and Mo 4+ Redox reaction for charge storage, so MoS 2 The theoretical Faraday pseudocapacitance can reach 1200F / g. However, the effective utilization of this extremely high theoretical capacity still faces two serious problems: (1) During the charge and discharge process, the electrolyte will be transferred to MoS 2 The depth of diffusion inside the material is limited, resulting in low effective utilizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/48H01G11/50B82Y30/00
CPCB82Y30/00H01G11/24H01G11/30H01G11/36H01G11/48H01G11/50Y02E60/13
Inventor 朱敏杨黎春朝洁胡仁宗刘江文
Owner SOUTH CHINA UNIV OF TECH
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