Nitrogen doped porous carbon/sulfur composite positive material as well as preparation method and application thereof

A nitrogen-doped porous carbon and composite cathode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low cycle stability and rate performance, poor product stability, and high production costs, and achieve large The effect of specific surface area and pore volume, reducing process cost and improving consistency

Active Publication Date: 2015-03-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The products and preparation methods of lithium-sulfur battery composite cathode materials currently reported still need to be further improved. For example, the sulfur loading of composite materials is low, the dissolution and diffusion of polysulfides are still relatively prominent, and the cycle stability and rate performance are low. And the existing method is more complicated, the production cost is high, and the product stability is relatively poor etc.

Method used

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  • Nitrogen doped porous carbon/sulfur composite positive material as well as preparation method and application thereof
  • Nitrogen doped porous carbon/sulfur composite positive material as well as preparation method and application thereof
  • Nitrogen doped porous carbon/sulfur composite positive material as well as preparation method and application thereof

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Effect test

Embodiment 1

[0060] A nitrogen-doped porous carbon material, the preparation method of which is as follows:

[0061] (1) Put 10.0g tetrasodium ethylenediaminetetraacetic acid into a porcelain ark with a volume of 14cm*4cm*2cm, put the porcelain ark into a tube furnace, seal it, pump air, and the vacuum degree is -0.085MPa. Inject high-purity argon inert gas, the flow rate is 200cc / min, heat up to 600°C, the heating rate is 5°C / min, keep the temperature for 2h, and naturally cool to room temperature to obtain solid powder;

[0062] (2) Wash the solid powder obtained in step (1) successively with 0.1mol / L dilute hydrochloric acid and deionized water, and filter until the filtrate is neutral;

[0063] (3) The solid powder obtained by filtering in step (2) was heated and dried at 100° C. for 24 hours, ground, and weighed to obtain 0.428 g of the nitrogen-doped porous carbon material, which was named NDPC600.

Embodiment 2

[0065] A nitrogen-doped porous carbon material, the preparation method of which is as follows:

[0066] (1) Put 20.0g of tetrasodium edetate into a porcelain ark with a volume of 14cm*4cm*2cm, put the porcelain ark into a tube furnace, seal it, pump air, the vacuum degree is -0.085MPa, pass Inject high-purity argon inert gas with a flow rate of 200cc / min, heat up to 700°C at a rate of 5°C / min, keep the temperature constant for 2h, and cool naturally to room temperature to obtain solid powder;

[0067] (2) Wash the solid powder obtained in step (1) successively with 0.1mol / L dilute hydrochloric acid and deionized water, and filter until the filtrate is neutral;

[0068] (3) The solid powder obtained by filtering in step (2) was heated and dried at 100° C. for 24 hours, ground, and weighed to obtain 0.736 g of the nitrogen-doped porous carbon material, which was named NDPC700.

Embodiment 3

[0070] (1) Put 16.0g of tetrasodium edetate into a porcelain ark with a volume of 14cm*4cm*2cm, put the porcelain ark into a tube furnace, seal, pump air, and the vacuum degree is -0.085MPa, pass Inject high-purity argon inert gas with a flow rate of 200cc / min, heat up to 800°C at a heating rate of 5°C / min, keep the temperature constant for 2h, and cool naturally to room temperature to obtain a solid powder;

[0071] (2) Wash the solid powder obtained in step (1) successively with 0.1mol / L dilute hydrochloric acid and deionized water, and filter until the filtrate is neutral;

[0072] (3) The solid powder obtained by filtering in step (2) was heated and dried at 100° C. for 24 hours, ground, and weighed to obtain 0.4196 g of the nitrogen-doped porous carbon material, which was named NDPC800.

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Abstract

The invention belongs to the field of electrochemical energy and discloses a nitrogen doped porous carbon/sulfur composite positive material as well as a preparation method and an application thereof in preparation of a lithium-sulfur battery positive plate. The nitrogen doped porous carbon/sulfur composite positive material disclosed by the invention is prepared by adopting a sulfur-ammonium chemical precipitation method; three-dimensional wedged nitrogen-containing porous carbon and sulfur particles form a core-shell structure, so that the electronic and ionic conductivity of the composite positive material are improved; meanwhile, the sulfur bearing capacity is also improved, dissolution and diffusion of polysulfides are limited, and thus the circulation stability and the capacity retention rate of a composite electrode prepared from the nitrogen doped porous carbon/sulfur composite positive material disclosed by the invention can be effectively increased. The preparation method can be used for accurately controlling the content of loaded sulfur without complex pretreatment and post-treatment procedures, so that the process cost is greatly lowered, the process operation is simplified, and the consistency and the stability of the composite material are improved as well.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy, and relates to a lithium-sulfur battery composite positive electrode material, in particular to a nitrogen-doped porous carbon / sulfur composite positive electrode material and its preparation method and its application in the preparation of lithium-sulfur battery positive electrode sheets. Background technique [0002] Elemental sulfur has a high theoretical specific capacity of 1672mAh / g, and when assembled with lithium metal (theoretical specific capacity 3860mAh / g) to form a battery, the theoretical mass specific energy can reach 2600Wh / kg; and sulfur has a wide range of sources, low cost, no pollution, High security advantages. Lithium-sulfur batteries are considered to be one of the most promising new secondary lithium-ion batteries based on the multi-electron reaction mechanism. [0003] However, lithium-sulfur batteries still have the following three key problems that restri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/5815H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 李小岗饶睦敏刘燕林陈东瑞林海斌刘时铸廖友好邢丽丹许梦清李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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