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Lithium-sulfur battery conductive agent based on nano transition metal phosphide/carbon composite material as well as preparation method and application of lithium-sulfur battery conductive agent

A carbon composite material, transition metal technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as single function and pure electrical conductivity, and achieve overall stability and improve electrical conductivity. Effect

Inactive Publication Date: 2020-07-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commonly used conductive agents include conductive carbon black, carbon nanotubes, carbon nanofibers, graphene, etc. However, the inventors have found that this type of conductive agent can only provide simple conduction, and its function is relatively single

Method used

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  • Lithium-sulfur battery conductive agent based on nano transition metal phosphide/carbon composite material as well as preparation method and application of lithium-sulfur battery conductive agent
  • Lithium-sulfur battery conductive agent based on nano transition metal phosphide/carbon composite material as well as preparation method and application of lithium-sulfur battery conductive agent
  • Lithium-sulfur battery conductive agent based on nano transition metal phosphide/carbon composite material as well as preparation method and application of lithium-sulfur battery conductive agent

Examples

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Effect test

no. 1 approach

[0068] 1. A preparation of a nano-transition metal phosphide / carbon composite material, comprising the steps of:

[0069] (1) Weigh 1g Super P (conductive carbon black), measure 10mL 30wt.% hydrogen peroxide, put the two into a stainless steel reactor with a capacity of 100mL lined with Teflon, and react hydrothermally at 150°C for 4h, The black powder obtained after the reaction was centrifuged and washed with deionized water for 3 times, and then air-dried at 120°C for 3 hours to obtain Super P with oxygen-containing groups.

[0070] (2) Add 80 mg of the Super P with oxygen-containing groups and 3.2 mmol of ferric nitrate to 160 mL of N,N-dimethylformamide and place them in a sealed glass bottle for ultrasonic dispersion for 1 hour to form 0.2 mol / L Fe 3+ Suspension. The mixed solution was transferred to an oil bath environment at 60° C., and stirred for 14 h. The reacted mixed solution is centrifugally washed and separated, and then freeze-dried to obtain an iron oxide / Su...

no. 2 example

[0082] 1. A preparation of a nano-transition metal phosphide / carbon composite material, comprising the steps of:

[0083] (1) Weigh 1g Super P (conductive carbon black), measure 10mL 30wt.% hydrogen peroxide, put the two into a stainless steel reactor with a capacity of 100mL lined with Teflon, and react hydrothermally at 150°C for 4h, The black powder obtained after the reaction was centrifuged and washed with deionized water for 3 times, and then air-dried at 120°C for 3 hours to obtain Super P with oxygen-containing groups.

[0084] (2) 80 mg of the Super P with oxygen-containing groups and 0.16 mol of ferric nitrate are added to 80 mL of deionized water and placed in a sealed glass bottle for ultrasonic dispersion for 1 h to form 2 mol / L Fe 3+ Suspension. The reaction was stirred at 20°C for 8h. After the reacted mixed solution was centrifugally cleaned and separated, and then air-dried at 60° C., the iron oxide / Super P composite material was obtained.

[0085] (3) The ...

no. 3 example

[0093] 1. A preparation of a nano-transition metal phosphide / carbon composite material, comprising the steps of:

[0094] (1) Weigh 1g Super P (conductive carbon black), measure 10mL 30wt.% hydrogen peroxide, put the two into a stainless steel reactor with a capacity of 100mL lined with Teflon, react at 150°C for 4h, and react The obtained black powder was centrifuged three times with deionized water and then air-dried at 120°C for 3 hours to obtain Super P with oxygen-containing groups.

[0095] (2) Add 60 mg of the Super P with oxygen-containing groups, 2.8 mol of cobalt acetate and 10.8 mL of 25 wt.% ammonia water into 140 mL of absolute ethanol, and then place it in a stoppered flask for ultrasonic dispersion for 15 minutes to form a 0.2 mol / Co of L 2+ Suspension. And the mixed solution was transferred to an 80°C oil bath environment, and stirred for 12 hours. After the reaction, the mixed solution was centrifugally cleaned and separated, and then freeze-dried to obtai...

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Abstract

The invention relates to the technical field of lithium-sulfur battery conductive agents, and in particular relates to a lithium-sulfur battery conductive agent based on a nano transition metal phosphide / carbon composite material as well as a preparation method and application of the lithium-sulfur battery conductive agent. The conductive agent comprises a conductive agent body and nano transitionmetal phosphide particles growing on the conductive agent body in situ, and the conductive agent body is a conductive carbon material. According to the invention, the conductive nano transition metalphosphide is compounded on the conductive carbon material to form the lithium-sulfur battery conductive agent with a new structure; the conductive performance of the lithium-sulfur battery conductiveagent is superior to that of a traditional conductive agent, shuttling of polysulfide can be effectively prevented, and a certain catalytic effect is generated; due to the existence of the catalyticaction of the transition metal phosphide, the reaction time of converting soluble lithium polysulfide into a liquid state in the charging and discharging process can be effectively shortened, and nucleation of lithium polysulfide is accelerated; the charging and discharging rate of a positive electrode material is increased; the utilization rate of active substances of the positive electrode material is increased; and the specific capacity and the cycling stability of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention relates to the technical field of conductive agents for lithium-sulfur batteries, in particular to a conductive agent for lithium-sulfur batteries based on nano-transition metal phosphide / carbon composite materials and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Lithium-sulfur batteries use sulfur and metallic lithium as the positive and negative active materials of the battery, and their theoretical specific capacity is large (1675mAh / g). Lithium-sulfur batteries have the advantages of light weight, large capacity, environmental friendliness, and easy availability of raw materials. A promisi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 胡成陈传忠侠光
Owner SHANDONG UNIV
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