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Preparation method of metal/metal oxide lithium-sulfur battery positive electrode skeleton structure

A skeleton structure, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, structural parts, etc., can solve problems such as unsatisfactory conductivity, limited active sites, and performance that have not reached commercialization

Pending Publication Date: 2022-06-03
HENAN UNIVERSITY
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  • Application Information

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Problems solved by technology

A variety of heterostructure materials have been reported so far, such as TiO 2 -TiN, VO 2 -VN, MoC-MoO x and CoO-Co 8 S 9 As a lithium-sulfur battery, the positive electrode framework structure has good electrochemical performance, but due to the unsatisfactory conductivity and limited active sites, its performance is far from meeting the requirements of commercialization.

Method used

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  • Preparation method of metal/metal oxide lithium-sulfur battery positive electrode skeleton structure
  • Preparation method of metal/metal oxide lithium-sulfur battery positive electrode skeleton structure
  • Preparation method of metal/metal oxide lithium-sulfur battery positive electrode skeleton structure

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[0032] A two-dimensional porous core-shell structure combined with oxygen vacancies in CC@Co / CoO 1-x The cathode skeleton structure of the nanosheet array lithium-sulfur battery is characterized by, such as figure 2 a, CC@Co / CoO 1-x Has a uniform nanosheet array structure, which is seamlessly connected by many irregular nanosheets originating from H 2 reduced Co 3 O 4 The Co atoms obtained from the nanoparticles are polymerized, and this structure is conducive to accelerating charge transfer and enhancing structural stability. like figure 2 b, the Co / CoO 1-x Nanosheets are porous structures, and the nanopores originate from Co 3 O 4 There is a huge volume shrinkage (about 49%) during the conversion of the particles to Co. like image 3 a, STEM and line scan results show that Co / CoO 1-x In nanosheets, Co is mainly distributed in the inner core of nanosheets; such as image 3 b, HRTEM results confirm the Co / CoO 1-x The nanosheets have a core-shell structure, and th...

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Abstract

The invention provides a preparation method of a metal / metal oxide lithium-sulfur battery positive electrode skeleton structure, which is characterized in that a CC (at) Co / CoO1-x nanosheet array combined with a porous core-shell structure and oxygen vacancies (OVs) is grown on carbon cloth (CC) to serve as the positive electrode skeleton structure, and the electrochemical performance of a lithium-sulfur battery is improved by utilizing the synergistic effect between a two-dimensional (2D) core-shell heterostructure and the OVs.

Description

technical field [0001] The invention relates to a preparation method for a positive electrode skeleton structure of a lithium-sulfur battery, in particular to a CC@Co / CoO with a two-dimensional porous core-shell structure and oxygen vacancy combination 1-x Fabrication of cathode skeleton structures for nanosheet arrays for lithium-sulfur batteries. Background technique [0002] Lithium-sulfur batteries have a theoretical specific capacity (1675mAh g -1 ), low cost, good environmental compatibility and other advantages, it is considered to be a very promising next-generation energy storage system, and has received extensive attention from global research institutions. However, the poor electrical conductivity of sulfur, the shuttle effect of polysulfides (LiPS) and their poor reaction kinetics seriously hinder the practical application of Li-S batteries. [0003] Carbon materials are considered as ideal sulfur storage materials due to their strong electrical conductivity, l...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/52H01M10/052B82Y30/00B82Y40/00
CPCH01M4/626H01M4/625H01M10/052H01M4/523B82Y30/00B82Y40/00Y02E60/10
Inventor 郁彩艳赵慧玲白莹李世玉尹延锋
Owner HENAN UNIVERSITY
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