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Preparation method of bionic carbon negative electrode material used as potassium ion battery negative electrode, and product

A negative electrode material and battery negative electrode technology, applied in the field of biomimetic carbon and its preparation, can solve the problems of insufficient rate performance and fast charge/discharge characteristics, and achieve excellent electrochemical performance, high reversible capacity, and excellent rate performance.

Inactive Publication Date: 2021-03-02
福建海峡石墨烯产业技术研究院有限公司
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  • Application Information

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Problems solved by technology

However, their rate capability and fast charging / discharging characteristics are still insufficient for practical battery applications, thus it is necessary to continue to study advanced carbon-based anodes for potassium-ion batteries

Method used

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  • Preparation method of bionic carbon negative electrode material used as potassium ion battery negative electrode, and product
  • Preparation method of bionic carbon negative electrode material used as potassium ion battery negative electrode, and product
  • Preparation method of bionic carbon negative electrode material used as potassium ion battery negative electrode, and product

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Embodiment 1

[0042] Such as figure 1 As shown, first, the preparation of nitrogen carbon compound (C 3 N 4 ) intermediate: 15 mg of melamine precursor was placed in a porcelain boat, and heated in a muffle tube furnace at 2 °C min -1 The heating rate is heated to 550°C, and kept at a constant temperature for 5h, and then naturally cooled to room temperature to obtain C 3 N 4 ;

[0043] Secondly, cobalt (Co) catalyst catalyzes high-temperature carbonization treatment: the C 3 N 4 Grind into fine powder, then mix with metal Co at a mass ratio of 1:1, and then fully mix in an agate mortar; after mixing evenly, put it into a porcelain boat, and heat it in a tube furnace with an argon atmosphere at 2°C min -1 Raise the temperature to 800°C at a certain rate, and heat it at this temperature for 2 hours, and then cool it naturally to room temperature;

[0044] Finally, acid treatment to remove the metal catalyst; repeated washing with 2mol / L hydrochloric acid (HCl) solution to remove Co, ...

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Abstract

The invention provides a preparation method of a bionic carbon negative electrode material used as a potassium ion battery negative electrode, and a product. The preparation method of the bionic carbon negative electrode material comprises the following steps: preparing a nitrogen-carbon compound (C3N4) intermediate; then catalyzing with a metal catalyst, and carbonizing at a high temperature of 700-900 DEG C; and finally, carrying out acid treatment to remove the metal catalyst, washing, and drying in a vacuum drying oven at 50-80 DEG C for 12-18 hours to obtain the biomimetic carbon negativeelectrode material similar to a biological cell structure. The negative electrode of the potassium ion battery is the biomimetic carbon negative electrode material prepared by the method, the potassium ion battery uses Prussian blue as a positive electrode, uses 4mol L<-1> of potassium bis(fluorosulfonyl) amide as an electrolyte, and uses 1, 2-dimethoxyethane as a solvent. The biomimetic carbon provided by the invention has excellent electrochemical properties such as high reversible capacity, excellent rate capability, excellent cycle performance and the like as a negative electrode materialof a potassium ion battery.

Description

【Technical field】 [0001] The invention relates to a potassium ion battery and a negative electrode material of the potassium ion battery, in particular to a biomimetic carbon used as the negative electrode of the potassium ion battery and a preparation method and application thereof. 【Background technique】 [0002] Potassium-ion batteries (PIBs) are considered as next-generation large-scale energy storage systems due to their inherent low cost and high energy density. The current in-depth research on advanced anode materials for PIBs includes: metallic materials, sulfides, selenides, polymers, phosphides, and carbon materials. As we all know, K + Interaction with metal electrodes can lead to significant volume expansion; for example, Sb and K + reaction to form K 3 Sb, its volume expansion is about 300%. This volume expansion can lead to pulverization and fragmentation of electrode materials, leading to rapid capacity drop and poor cycling stability. In addition, other ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/133H01M10/054B82Y40/00B82Y30/00
CPCH01M4/583H01M4/133H01M10/054B82Y40/00B82Y30/00Y02E60/10
Inventor 丁红波鲁兵安
Owner 福建海峡石墨烯产业技术研究院有限公司
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