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LiMnxOy-C three-dimensional nanosheet array as well as preparation method and application thereof

A three-dimensional nano-array technology, applied in the field of LiMnxOy@C three-dimensional nanosheet array material and preparation, can solve the problems of uneven thickness and reduced cycle performance, and achieve the effects of uniform morphology, high specific capacity, and low environmental pollution.

Active Publication Date: 2020-04-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiMn obtained by this method 2 o 4 The thickness is not uniform, and the film is covered with many irregular small particles, which reduces the further improvement of its cycle performance

Method used

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  • LiMnxOy-C three-dimensional nanosheet array as well as preparation method and application thereof
  • LiMnxOy-C three-dimensional nanosheet array as well as preparation method and application thereof
  • LiMnxOy-C three-dimensional nanosheet array as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 0.7353g Mn(CH 3 COO) 2 and 0.42612 g of Na 2 SO 4 Dissolve in 30ml deionized water, stir magnetically for 5 minutes to fully dissolve. Next, place a piece of 1×1cm 2 The nickel foam is used as the working electrode, the Pt sheet is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode. In the prepared solution, cyclic voltammetry electrodeposition is first carried out, the potential interval is 0.5-0.8V, and the deposition time is 30s. Then conduct constant voltage electrodeposition, the deposition potential is 0.7V, the deposition time is 30s, wash, dry and anneal for 2h under nitrogen at 200°C to obtain the precursor. Put the obtained precursor into 30ml to dissolve 0.03776g LiOH·H 2 O aqueous solution in a beaker, then transfer the precursor and the solution to a polytetrafluoroethylene reactor, and react at 200°C for 24h. After the reaction, wash and dry. The obtained sample was soaked in 0.02M glucose aqueous s...

Embodiment 2

[0030] 0.7353g Mn(CH 3 COO) 2 and 0.42612 g of Na 2 SO 4 Dissolve in 30ml deionized water, stir magnetically for 5 minutes to fully dissolve. Next, place a piece of 1x1cm 2 The foamed nickel was used as the working electrode, the Pt sheet was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. In the prepared solution, cyclic voltammetry electrodeposition was first carried out, the potential interval was 0.6-0.9V, and the deposition time was 60s. Then conduct constant voltage electrodeposition, the deposition potential is 1V, the deposition time is 40s, washed, dried and annealed under nitrogen at 150°C for 1h to obtain the precursor. Put the obtained precursor into a 30ml beaker in which 0.03776g of LiOH·H2O aqueous solution was dissolved, then transfer the precursor and the solution to a polytetrafluoroethylene reactor, and react at 190°C for 18h. After the reaction, wash and dry. The obtained sample was soaked in 0.0...

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Abstract

The invention discloses a LiMnxOy-C three-dimensional nanosheet array as well as a preparation method and application thereof. The surface of the three-dimensional nanosheet array is rich in oxygen vacancies, and the LiMnxOy-C three-dimensional nanosheet array is composed of a compound composed of MnO coated with a carbon layer, gamma-MnO2 and LiMn2O4 and takes mn (CH3COO) 2 as a raw material, na2SO4 as electrolyte, water as solvent and foamed nickel as current collector. A precursor is prepared through an electrochemical deposition method, then is transferred into a LiOH aqueous solution, issubjected to lithium intercalation through a hydrothermal reaction, finally is soaked into a glucose aqueous solution after lithium intercalation and then is subjected to Ar / H2 annealing to obtain thethree-dimensional LiMnxOy / C nanosheet array material with the surface rich in oxygen vacancy defects. The material has a three-dimensional array structure, is beneficial for electrolyte to enter andreact with an active material, is rich in oxygen vacancies and effectively improves the electrochemical performance. The coated carbon layer can improve the conductivity and mechanical stability of anelectrode material. The preparation method is simple and environment-friendly, and does not need a complex post-treatment process.

Description

technical field [0001] The invention relates to a LiMn grown on a foamed nickel surface rich in oxygen vacancy defects x o y @C Three-dimensional nanosheet array materials and preparation methods, belonging to the field of new materials and energy chemical industry Background technique [0002] Supercapacitor materials have high power density, long cycle life and fast charge-discharge process, but their low energy density limits their further application in the field of energy storage. Therefore, the combination of high cycle life of supercapacitor materials and high capacity of lithium-ion batteries Lithium-ion capacitors have received extensive attention. Spinel LiMn 2 o 4 With high theoretical capacity and wide working potential window, it has been widely used in the battery field, but the dissolution of Mn in the long-term charge and discharge process leads to poor cycle performance, while γ-MnO 2 Compared with other crystal forms of MnO 2 Performance decays more s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/46H01G11/32H01G11/26H01G11/24H01G11/86C01G45/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G45/12C01P2002/72C01P2004/03C01P2004/04H01G11/24H01G11/26H01G11/32H01G11/46H01G11/50H01G11/86
Inventor 郝青丽姚迪吴宗燈雷武宋娟娟
Owner NANJING UNIV OF SCI & TECH
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