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Graphene-cladded sulfur/microporous carbon sphere composite cathode material

A composite material, microporous carbon technology, applied in graphene-coated sulfur/microporous carbon ball composite material and its preparation, secondary aluminum battery field, can solve the problem of poor rate performance, short cycle life, active material utilization rate Low problems, to achieve the effect of improving cycle performance, large adsorption capacity, and good electrical conductivity

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

[0007] 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of microporous carbon spheres: Add 6mol sulfonic acid to glucose as a carbon source to form a solution containing 5% sucrose, heat to 120°C, react for 10 hours, form a black suspension, filter and dry, and heat under the protection of an inert atmosphere Sinter at 1000°C for 2h.

[0047] (2) Microporous carbon spheres and composite sulfur: put the prepared microporous carbon spheres and elemental sulfur in a tube furnace at a mass ratio of 1:5,

[0048] Under the protection of inert gas, heat to 150° C. for 6 hours to obtain a sulfur / microporous carbon sphere composite material.

[0049] (3) Coated graphene: prepare a graphene oxide aqueous solution with a concentration of 8 mg / ml, ultrasonically disperse for 5 hours, and then add

[0050] Add the reducing agent ammonia water, react under ultrasonic conditions for 48h, obtain the graphene dispersion liquid, obtain the graphene dispersion liquid that the graphene content is 4wt% through vacuum suction fi...

Embodiment 2

[0052] (1) Preparation of microporous carbon spheres: Add 6mol sulfonic acid to glucose as a carbon source to form a solution containing 5% sucrose, heat to 120°C, react for 10 hours, form a black suspension, filter and dry, and heat under the protection of an inert atmosphere Sinter at 1000°C for 2h.

[0053] (2) Microporous carbon spheres and composite sulfur: Put the prepared microporous carbon spheres and elemental sulfur in a tube furnace at a mass ratio of 1:5, and heat to 150°C for 6 hours under the protection of an inert gas to obtain sulfur / micropores Carbon sphere composite.

[0054] (3) Coated graphene: prepare a graphene oxide aqueous solution with a concentration of 16 mg / ml, ultrasonically disperse for 5 hours, then add reducing agent ammonia water, and react under ultrasonic conditions for 48 hours to obtain a graphene dispersion, which is obtained by vacuum filtration and water washing A graphene dispersion with a graphene content of 8wt%, the sulfur / microporo...

Embodiment 3

[0056] (1) Preparation of microporous carbon spheres: Add 6mol sulfonic acid to glucose as a carbon source to form a solution containing 5% sucrose, heat to 120°C, react for 10 hours, form a black suspension, filter and dry, and heat under the protection of an inert atmosphere Sinter at 1000°C for 2h.

[0057] (2) Microporous carbon spheres and composite sulfur: Put the prepared microporous carbon spheres and elemental sulfur in a tube furnace at a mass ratio of 1:5, and heat to 150°C for 6 hours under the protection of an inert gas to obtain sulfur / micropores Carbon sphere composite.

[0058] (3) Coated graphene: prepare a graphene oxide aqueous solution with a concentration of 24 mg / ml, ultrasonically disperse for 5 hours, then add reducing agent ammonia water, and react under ultrasonic conditions for 48 hours to obtain a graphene dispersion, which is obtained by vacuum filtration and water washing Graphene content is the graphene dispersion liquid of 12wt%, and sulfur / mic...

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Abstract

The invention discloses a composite cathode material for secondary aluminum batteries. The composite cathode material is formed by compounding microporous carbon spheres, sulfur and graphene, has good electric conductivity and is capable of effectively suppressing that polysulfide dissolves in electrolyte to cause the shuttle effect. The preparation method of the composite cathode material comprises the following steps: firstly compounding the microporous carbon spheres and the sulfur, and then cladding the outer layer of the composition with a graphene sheet layer. The preparation method is simple in process and low in cost, toxic raw materials are not used, environment friendliness is achieved, the energy density is high, the utilization ratio of the sulfur is high, and the rate capability and the cycle performance of the secondary aluminum batteries are improved greatly.

Description

technical field [0001] The invention belongs to the field of electrochemical and new energy products, and relates to a graphene-coated sulfur / microporous carbon sphere composite material and a preparation method thereof. The invention also relates to a secondary aluminum battery using the composite material as the positive electrode. Background technique [0002] With the rapid development of new power sources such as electronic and communication equipment, electric vehicles, wind power generation and photovoltaic power generation, human beings have higher and higher requirements for battery performance of supporting power sources, and there is an urgent need to develop batteries with high energy, low cost, long life, and green , Power batteries and energy storage batteries that are rich in battery material resources and recyclable. Compared with traditional electrode materials, both elemental aluminum and sulfur have the advantages of high theoretical energy density, abund...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCH01M4/139H01M4/362H01M4/625H01M10/054Y02E60/10
Inventor 赵宇光解淑晶
Owner NANJING ZHONGCHU NEW ENERGY
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