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CoNiP-rGO/S composite lithium-sulfur battery positive electrode material and preparation method thereof

A positive electrode material, conip-rgo technology, applied in the field of preparation of lithium-sulfur battery electrode materials, can solve problems such as low conductivity, fast capacity decay, and limited practical applications

Active Publication Date: 2021-05-11
山东济清科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among various rechargeable battery devices, lithium-sulfur batteries have the overwhelming advantages of high natural abundance, high specific energy density, and high theoretical capacity, but problems such as the low conductivity of sulfur and the shuttle effect of soluble lithium polysulfides will cause battery The poor rate performance and fast capacity decay greatly limit its practical application.

Method used

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  • CoNiP-rGO/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • CoNiP-rGO/S composite lithium-sulfur battery positive electrode material and preparation method thereof
  • CoNiP-rGO/S composite lithium-sulfur battery positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0030] Example 1 Preparation method of a CoNiP-rGO / S composite lithium-sulfur battery cathode material

[0031] Specifically include the following steps:

[0032] (1) Stir 0.1 g cobalt chloride hexahydrate, 0.1 g nickel chloride hexahydrate, 1.8 g urea, 0.055 g GO and 30 mL ethylene glycol, transfer them to an autoclave, and react at 200 °C 1 h; after centrifugation, freeze-dry for 18 h to obtain a precursor of cobalt-nickel ions loaded on the surface of graphene. The precursor was prepared by solvothermal method.

[0033] (2) After the precursor obtained in step (1) was calcined under argon at 500 °C for 4 h, 0.33 g of sodium hypophosphite was added to the tube furnace, and then calcined at 500 °C for 5 h to obtain CoNiP-rGO.

[0034] (3) The CoNiP-rGO obtained in step (2) was mixed with sulfur at a mass ratio of 2:3, ground evenly, and annealed at 150 °C for 12 h in an inert atmosphere to obtain the CoNiP-rGO / S composite lithium-sulfur battery cathode material.

[0035] T...

Embodiment 2

[0044] Example 2 Preparation method of a CoNiP-rGO / S composite lithium-sulfur battery cathode material

[0045] Specifically include the following steps:

[0046] (1) Stir 0.12g cobalt chloride hexahydrate, 0.12g nickel chloride hexahydrate, 2.3 g urea, 50 mg GO and 30 mL ethylene glycol, transfer them to an autoclave, and react at 200°C 1 h; after centrifugation, freeze-dry for 18 h to obtain a precursor of cobalt-nickel ions loaded on the surface of graphene. The precursor was prepared by solvothermal method.

[0047] (2) After the precursor obtained in step (1) was calcined under argon at 500 °C for 4.2 h, 0.3 g of sodium hypophosphite was added to the tube furnace, and then calcined at 500 °C for 5 h to obtain CoNiP-rGO .

[0048] (3) The CoNiP-rGO obtained in step (2) was mixed with sulfur at a mass ratio of 2:3, ground evenly, and annealed at 150 °C for 12.5 h in an inert atmosphere to obtain the CoNiP-rGO / S composite lithium-sulfur battery cathode material.

[0049]...

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Abstract

The invention relates to a CoNiP-rGO / S composite lithium-sulfur battery positive electrode material and a preparation method thereof, in the positive electrode material, CoNiP quantum dots are uniformly attached to a sheet layer of rGO, and S is loaded on CoNiP-rGO. The preparation method comprises the following steps: (1), preparing a precursor with cobalt and nickel attached to a graphene sheet layer, and performing annealing; (2), carrying out annealing again to obtain CoNiP-rGO; and (3), obtaining the CoNiP-rGO / S composite lithium-sulfur battery positive electrode material. The CoNiP quantum dots are used as a catalyst, the redox reaction of polysulfide can be promoted, efficient polysulfide adsorption is provided, rGO is used as a three-dimensional high-conductivity network, on one hand, rapid and efficient lithium ion and electron transmission can be achieved, the sulfur utilization rate is increased, and on the other hand, the redox reaction is accelerated. In a word, the material is a novel main body material which can be applied to the positive electrode of the lithium-sulfur battery and has an adsorption effect, a catalytic effect and high conductivity.

Description

technical field [0001] The invention relates to a CoNiP-rGO / S composite lithium-sulfur battery cathode material and a preparation method thereof, belonging to the field of preparation of lithium-sulfur battery electrode materials. Background technique [0002] The depletion of fossil fuels and oil and the renaissance of electric vehicles have prompted scientists to develop sustainable electrical energy storage systems. Converting and storing electrical energy is becoming one of the major issues of increasing concern to future society. As a result, society's growing demand for sustainable energy supply requires high-performance and low-cost electrochemical energy storage devices. Over the past three decades, lithium-ion batteries have gained popularity due to their large energy storage, low self-discharge, and stable cycle performance, greatly promoting the development of energy storage technologies. Therefore, the current exploration of new battery systems shows higher e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/133H01M4/136H01M4/139H01M4/36H01M4/58H01M4/583H01M10/052
CPCH01M4/0471H01M4/136H01M4/133H01M4/139H01M4/362H01M4/5805H01M4/583H01M2004/028H01M10/052Y02E60/10
Inventor 任慢慢肖亭娇衣凤瑾刘伟良杨铭志
Owner 山东济清科技服务有限公司