Nano carbon sulfur composite material with network structure and preparation method of nano carbon composite material

A network structure and composite material technology, which is applied in the fields of nano-carbon materials, nano-carbon-sulfur composite materials and their preparation, can solve the problems of low utilization rate of sulfur, poor cycle stability, unstable structure of polysulfide materials, etc. Dissolution-diffusion loss, outstanding electrical conductivity, the effect of improving electron or ion transport rate and reaction area

Inactive Publication Date: 2011-08-03
NO 63971 TROOPS PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 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 structure, low sulfur utilization rate and poor cycle stability in lithium-sulfur batteries. Cross-linked network structure nano-carbon-sulfur composite material composed of polymer chains and preparation method thereof

Method used

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  • Nano carbon sulfur composite material with network structure and preparation method of nano carbon composite material
  • Nano carbon sulfur composite material with network structure and preparation method of nano carbon composite material
  • Nano carbon sulfur composite material with network structure and preparation method of nano carbon composite material

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Effect test

Embodiment 1

[0102] Put 15g of carbon black in a three-necked flask and add concentrated HNO dropwise during stirring 3 The solution was 500mL, ultrasonicated for 30min, heated to 80°C in a water bath, condensed and refluxed for 4h, the reaction was stopped, filtered, and washed to obtain functionalized carbon containing hydroxyl, carboxyl, ester and other groups.

Embodiment 2

[0104] Prepare 0.25mol / L K 2 C r 2 o 7 , Transfer 500mL of 1mol / L hydrochloric acid mixed solution into a 1000mL three-necked flask, add 15g of carbon black, ultrasonically disperse for 30min, stir mechanically at a high speed at 80°C for 4h, cool, and rinse repeatedly with a large amount of deionized water until the filtrate is 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

[0106] 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 for 1 hour. After cooling to room temperature, carefully pour it into 500ml of water while stirring, filter, and wash. A functionalized carbon containing sulfonic acid groups is obtained.

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Abstract

The invention relates to a nano carbon material with a network structure consisting of polymer chains, in particular to a nano carbon sulfur composite material with a network structure suitable to be used in a secondary lithium sulfur battery anode and a preparation method thereof. The carbon sulfur composite material is formed by adopting the following steps of: introducing functional groups onto carbon particles by adopting the electric conductivity and the porosity of a carbon material and the reaction capacity of similar condensed aromatics of the carbon material and by means of an irreversible chemical reaction; introducing the polymer chains, wherein the polymer chains are stretched, bent and cross-linked on the surfaces of the carbon particles to form a cross-linked network structure; and compounding a sulfur element or a polysulfide (m is more than 2) containing -Sm- structure into the network structure to form the nano carbon sulfur composite material with the network structure. The carbon sulfur composite material has a rich cross-linked network structure, nano-scale network pores constrain the sulfur element or the polysulfide (m is more than 2) containing the -Sm- structure in the network, and the active substances are limited in a certain region to react, so that the composite material has predominant electrochemical performance.

Description

technical field [0001] The invention relates to a nano-carbon material with a network structure, and the network structure is composed of polymer chains, in particular to a nano-carbon-sulfur composite material with a network structure and a preparation method thereof, which is suitable for use in the positive electrode of a secondary lithium-sulfur battery. field of electrochemical cells. 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 (LiCoO 2 ) has a relatively large theoretical capacity of 275mAh / g, but its price is high, it has certain toxicity, and the material is prone to exothermic decomposition reaction when overch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/139B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王安邦苑克国王维坤余仲宝邱景义
Owner NO 63971 TROOPS PLA
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