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Carbon-sulfur-shell matter composite material having network dual-core shell structure and preparation method thereof

A composite material and core-shell structure technology, applied in the field of electrochemistry, can solve the problems of polysulfur materials such as unstable structure, poor cycle stability, and low sulfur utilization rate

Inactive Publication Date: 2013-12-25
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is mainly to provide a lithium-sulfur battery with good electrical conductivity, high specific capacity and good cycle stability due to the shortcomings of unstable polysulfide material structure, low sulfur utilization rate and poor cycle stability in lithium-sulfur batteries. Carbon-sulfur-shell composite material with network double core-shell structure and preparation method thereof

Method used

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  • Carbon-sulfur-shell matter composite material having network dual-core shell structure and preparation method thereof
  • Carbon-sulfur-shell matter composite material having network dual-core shell structure and preparation method thereof
  • Carbon-sulfur-shell matter composite material having network dual-core shell structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0087] Put 15g of carbon black in a three-necked flask and add 500mL of concentrated HNO3 solution dropwise during stirring, ultrasonicate for 30min, heat in a water bath to 80°C, condense and reflux for 4h, stop the reaction, filter, wash, and obtain groups containing hydroxyl, carboxyl, ester, etc. functionalized carbon.

Embodiment 2

[0089] Prepare 500mL of 0.25mol / L K2C r2O7, 1mol / L hydrochloric acid mixed solution, transfer it into a 1000mL three-neck flask, add 15g of carbon black, ultrasonically disperse for 30min, stir mechanically at 80°C for 4h, cool, and rinse repeatedly with a large amount of deionized water until the filtrate until neutral. The product was dried in a vacuum oven at 80° C. for 24 hours and then ground to obtain functionalized carbons containing hydroxyl groups, carboxyl groups, ester groups and other groups.

Embodiment 3

[0091] Add 15g of carbon black into the reaction flask, add dropwise a mixed solution of 5ml of concentrated sulfuric acid and 100ml of acetic anhydride with stirring, keep warm at 70°C, and complete the dropwise addition in 1 hour. After cooling to room temperature, carefully pour into 500ml of water while stirring, filter and wash , to obtain a functionalized carbon containing a sulfonic acid group.

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Abstract

The invention relates to a carbon-sulfur-shell matter composite material having a network dual-core shell structure and a preparation method thereof. The carbon-sulfur-shell matter composite material has a carbon-sulfur-shell three layer structure, a central core (inner core) is nano carbon particles, sulfur elemental or a polysulfide containing-Sm-structure (m>2) is directly deposited on the nano carbon particles, or functional groups are introduced onto the nano carbon particles by use of polycyclic aromatic hydrocarbon like reaction capacity of the carbon material and through an irreversible chemical reaction, polymeric chains are introduced in, a crosslinked network structure is formed through stretching, bending and crosslinking of the polymeric chains on the surface of the nano carbon particles, the sulfur elemental or the polysulfide containing the-Sm-structure (m>2) is composited onto the crosslinked network structure to form a nano sulfur layer having a network structure, then a mono-core shell nano composite material having a network structure is obtained and is used as a second layer (outer core) of the carbon-sulfur-polymer composite material having the network dual-core shell structure, an outermost layer is a shell matter layer, electronic and / or ionic conductivity of the material are / is improved, dissolving loss of discharge products can be further inhibited, and structural stability of the material is improved. The material is suitable for positive poles of lithium sulfur batteries, and has a prominent effect on improvement of cycle stability of the lithium sulfur batteries.

Description

technical field [0001] The invention relates to a carbon-sulfur-shell composite material with a network double-core-shell structure and a preparation method thereof, which is suitable for lithium-sulfur battery cathode materials and belongs to the field of electrochemistry. Background technique [0002] The positive electrode of a secondary lithium battery is mainly composed of three parts, which are active material, binder and conductive agent. Currently commercialized active materials are mainly layered or spinel-structured lithium transition metal oxides (such as lithium cobaltate, lithium manganate) and olivine-structured lithium iron phosphate. Lithium cobalt oxide (LiCoO2) has a relatively large theoretical capacity of 275mAh / g, but its price is high and has certain toxicity, and the material is prone to exothermic decomposition reaction when overcharged. On the one hand, the actual capacity of the material is lower than that of 200mAh / g, on the other hand, it also po...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/04H01M10/39B82Y30/00
CPCY02E60/10
Inventor 王安邦王维坤苑克国余仲宝邱景义杨裕生
Owner NO 63971 TROOPS PLA
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