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TiO2 coated sulfur/ordered mesoporous carbon composite cathode material and preparation method thereof

A composite positive electrode material and composite material technology, applied in the field of electrochemical and new energy products, can solve the problems of poor rate performance, low utilization rate of active materials, short cycle life, etc., to inhibit dissolution loss, reduce shuttle effect, low cost effect

Inactive Publication Date: 2015-01-07
NANJING ZHONGCHU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low utilization rate of active material, short cycle life and poor rate performance of existing electrode materials, and provide a composite positive electrode with simple preparation process, high specific capacity, high rate property and good cycle performance

Method used

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  • TiO2 coated sulfur/ordered mesoporous carbon composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of ordered mesoporous carbon: Add 24g of F127 template to the mixed solution of hydrochloric acid (15g 0.2M) and ethanol (120g), react at 40°C for 1h to form a clear solution; then add 31.2g of TEOS and The ethanol solution containing 20wt% phenolic resin was stirred and reacted for 5 hours to synthesize the precursor, and dried at 100°C; the precursor powder was placed in a tube furnace, heated to 900°C under an inert protective gas, and kept for 2 hours to form a Sequenced carbon-silicon complex; dissolving the carbon-silicon complex in HF to dissolve silicon; vacuum drying to form ordered mesoporous carbon.

[0048] (2) Composite sulfur: Put elemental sulfur and prepared ordered mesoporous carbon into a tube furnace at a mass ratio of 11:9, heat to 150°C for 6 hours under the protection of an inert gas to obtain sulfur / ordered mesoporous carbon composite material.

[0049] (3) coated TiO 2 : Sulfur / Ordered Mesoporous Composite with TiO 2 Calculated...

Embodiment 2

[0051] (1) Preparation of ordered mesoporous carbon: Add 24g of F127 template to the mixed solution of hydrochloric acid (15g 0.2M) and ethanol (120g), react at 40°C for 1h to form a clear solution; then add 31.2g of TEOS and The ethanol solution containing 20wt% phenolic resin was stirred and reacted for 5h to synthesize the precursor, and dried at 100°C. The precursor powder was put into a tube furnace, heated to 900°C under an inert protective gas, and kept for 2 hours to form an ordered carbon-silicon composite. Dissolve the carbon-silicon composite in HF to dissolve the silicon; vacuum-dry to form ordered mesoporous carbon.

[0052] (2) Composite sulfur: Put elemental sulfur and prepared ordered mesoporous carbon into a tube furnace at a mass ratio of 3:2, heat to 150°C under the protection of an inert gas, and keep warm for 6 hours to obtain sulfur / ordered mesoporous carbon carbon composites.

[0053] (3) coated TiO 2 : Sulfur / Ordered Mesoporous Composite with TiO 2 ...

Embodiment 3

[0055] (1) Preparation of ordered mesoporous carbon: Add 24g of F127 template into the mixed solution of hydrochloric acid (15g 0.2M) and ethanol (120g), react at 40°C for 1h to form a clear solution; then add 31.2g of TEOS and containing 20wt% ethanol solution of phenolic resin was stirred and reacted for 5h to synthesize the precursor, and dried at 100°C. Put the precursor powder into a tube furnace, heat to 900°C under an inert protective gas, and keep it warm for 2 hours to form an ordered carbon-silicon composite; dissolve the carbon-silicon composite in HF to dissolve silicon; vacuum dry to form Ordered mesoporous carbon.

[0056] (2) Composite sulfur: Put elemental sulfur and prepared ordered mesoporous carbon into a tube furnace at a mass ratio of 13:7, heat to 150°C under the protection of inert gas, and keep warm for 6 hours to obtain sulfur / ordered mesoporous carbon carbon composites.

[0057] (3) coated TiO 2 : Sulfur / ordered mesoporous composites and TiO2 are c...

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Abstract

The invention discloses a TiO2 coated sulfur / ordered mesoporous carbon composite cathode material and a preparation method thereof as well as the application thereof in a secondary aluminum battery. The cathode material consists of a sulfur active substance, ordered mesoporous carbon and TiO2 and is characterized in that the ordered mesoporous carbon has a highly-ordered three-dimensional pore structure, is provided with a conductive network and provides a large number of adhesion area for the active substance and a conductive channel; a TiO2 coating layer has a very effective shuttle effect of blocking polysulfide. The preparation method of the TiO2 coated sulfur / ordered mesoporous carbon composite cathode material comprises the following steps: compounding the ordered mesoporous carbon and sulfur and then TiO2 coating on an outer layer. The preparation method has the advantages of simple process, low cost, no toxic raw material used, environmental friendliness, high energy density and high sulfur utilization rate, and the rate performance and the cycle life of the secondary aluminum battery are greatly improved.

Description

technical field [0001] The invention belongs to the field of electrochemical and new energy products, and relates to a TiO 2 Coated sulfur / mesoporous carbon composite positive electrode material and preparation method thereof. The invention also relates to a secondary aluminum battery using the composite material as the positive electrode. Background technique [0002] The theoretical volume specific capacity of aluminum is 8050mAh / cm 3 , is 4 times that of lithium, and the chemical activity is stable, it is an ideal negative electrode material; the theoretical volume specific capacity of sulfur is 3467mAh / cm 3 , is one of the cathode materials with the highest energy density known. The secondary battery composed of aluminum and sulfur is an energy storage system with abundant resources, no pollution, low price, high energy density and safe use, and it is the representative and direction of the secondary battery. [0003] The working principle of the secondary aluminum-s...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/48
CPCH01M4/48H01M4/583H01M4/624Y02E60/10
Inventor 赵宇光解淑晶
Owner NANJING ZHONGCHU NEW ENERGY
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