A preparation method of boron and phosphorus doped graphitized carbonitride positive electrode material activated by KOH

A carbon-nitrogen compound and cathode material technology, used in active material electrodes, positive electrodes, battery electrodes, etc., can solve the problems of high sulfur loading and low conductivity of sulfur carriers, delay the shuttle effect, and increase the ratio. Surface area, the effect of improving electrochemical performance

Active Publication Date: 2021-06-08
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the sulfur carrier in the lithium-sulfur battery cannot achieve high sulfur load and the conductivity is low, and to provide a method for preparing a boron and phosphorus-doped graphitized carbon-nitride positive electrode material activated by KOH

Method used

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  • A preparation method of boron and phosphorus doped graphitized carbonitride positive electrode material activated by KOH

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specific Embodiment approach 1

[0015] Specific embodiment one: what this embodiment records is a kind of preparation method of boron and phosphorus-doped graphitized carbonitride positive electrode material activated by KOH, the specific steps of the method are as follows:

[0016] Step 1: Weigh 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF 4 ), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF 6 ) and cyanamide solution, mix the three (BMIMBF 4 and BMIMPF 6 After mixing evenly, add cyanamide solution), add deionized water and stir evenly, heat until the water is completely evaporated to precipitate a white solid, blow dry, then transfer to a muffle furnace, and set the heating program to: 5°C min -1 Rise to 390°C, keep for 4h, then 5°C for min -1 Raise to 500°C, keep for 2 hours, and cool naturally to room temperature to obtain a dark brown powder, which is a graphitized carbonitride material doped with boron and phosphorus (B-P-CN);

[0017] Step 2: Dry the boron and phosphorus-doped gra...

specific Embodiment approach 2

[0018] Specific embodiment two: a kind of preparation method of boron and phosphorus-doped graphitized carbonitride positive electrode material with KOH activation described in specific embodiment one, in step one, the concentration of described cyanamide solution is 50wt. %.

specific Embodiment approach 3

[0019] Embodiment 3: A method for preparing a boron- and phosphorus-doped graphitized carbonitride positive electrode material activated by KOH described in Embodiment 1. In step 1, the heating temperature is 80-100°C. Stir and heat on a magnetic stirrer to mix thoroughly.

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Abstract

The invention discloses a method for preparing boron and phosphorus-doped graphitized carbonitride cathode materials activated by KOH, which belongs to the technical field of lithium-sulfur batteries. The purpose of the present invention is to solve the problem that the sulfur carrier in the lithium-sulfur battery cannot achieve high sulfur load and has low conductivity. The method is: weigh the reaction raw materials according to a certain mass ratio, mix the three, add deionized Stir evenly with water, heat to precipitate a white solid, and then calcine after blast drying to obtain a graphitized carbonitride material doped with boron and phosphorus; dry it, weigh the graphitized carbonitride material doped with boron and phosphorus and hydrogen oxide Potassium solid, dissolve the latter in ultrapure water, add graphitized carbonitride material, stir and heat on a magnetic stirrer, blow dry and then calcinate. The material of the invention has a large specific surface area and a highly interconnected graphite-like layered stacking structure, has good electrical conductivity and a porous structure, and can improve ion transport and relieve volume expansion.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a method for preparing a boron- and phosphorus-doped graphitized carbon-nitride cathode material activated by KOH. Background technique [0002] In recent years, with the rapid development of social economy, the application of energy storage devices in mobile electronics, hybrid electric vehicles and other fields has become more and more important, and it also plays an important role in the collection, conversion and storage of renewable energy. Lithium-ion batteries are the main energy storage technology for power banks today. However, the total capacity of lithium-ion batteries is largely limited by the cathode material LiCoO 2 (272mAh g -1 ), LiFePO 4 (170mAh g -1 ) and other theoretical capacities cannot meet the growing consumer demand. Lithium-sulfur batteries are considered to be one of the most promising high-energy power sources due to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/625H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 尹苗苗杨成徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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