High nitrogen doped porous microcrystalline carbon potassium anode material developed by Shenzhen Advanced Research Institute

Recently, researcher Tang Yongbing and his team from the research center of functional thin film materials, Shenzhen Institute of advanced technology, Chinese Academy of Sciences, jointly with Professor Li Zhensheng from City University of Hong Kong, have successfully developed porous microcrystalline carbon nanomaterials with high nitrogen doping, which exhibit high capacity and long cycle characteristics as the negative electrode of potassium ion battery Relevant research results "ultra nitrogen doping of carbon nanosheets for high capacity and long cycling potassium ion storage" were published in advanced energy materials (DOI: 10.1002 / aenm 201902672) Due to the abundant Potassium reserves and the potential of standard hydrogen electrode close to lithium, the potassium based energy storage device has a good application prospect in the field of large-scale energy storage However, due to the large ion radius of potassium ion, it not only hinders its insertion / removal from the electrode material, but also leads to the slow dynamics and large volume change of the electrode material, resulting in poor cycle stability Therefore, it is urgent to develop efficient and low-cost electrode active materials for potassium ion storage Based on the above considerations, researcher Tang Yongbing and his team members Chang Xingqi, Zhou Xiaolong, Ou Xuewu, etc have successfully developed porous microcrystalline carbon nanomaterials with high nitrogen doping, whose porous structure is conducive to the rapid diffusion of potassium ions, and a large number of microcrystalline carbon nanochips are conducive to the intercalation and adsorption of potassium ions The results show that the electrochemical reaction of the high nitrogen doped microcrystalline carbon nanomaterials is a synergistic mechanism of diffusion reaction and pseudo capacitance reaction As a potassium electrode, it has a high capacity of ~ 410 MAH / g and a capacity retention rate of about 70% after 3000 reversible cycles at a high current density of 5 A / g This work provides a new strategy for the design of high performance potassium anode materials The research was supported by NSFC, Guangdong international cooperation project and Shenzhen Science and technology plan.