标题：Phenolic resin-based carbon microspheres for potassium ion storage
作者：Wang, Shuo; Li, Yanyan; Ma, Fanteng; Wu, Xiaozhong; Zhou, Pengfei; Miao, Zhichao; Gao, Peibo; Zhuo, Shuping; Zhou, Jin
作者机构：[Wang, Shuo; Li, Yanyan; Ma, Fanteng; Wu, Xiaozhong; Zhou, Pengfei; Miao, Zhichao; Zhuo, Shuping; Zhou, Jin] Shandong Univ Technol, Sch Chem & Chem En 更多
通讯作者：Zhou, Jin;Zhou, J
通讯作者地址：[Zhou, J]Shandong Univ Technol, Sch Chem & Chem Engn, Zibo 255049, Peoples R China.
来源：APPLIED SURFACE SCIENCE
关键词：Carbon electrode; Potassium ion batteries; Potassium ions storage;; N-doping; Crystallite size
摘要：Potassium ion batteries (PIBs) have received widespread attention nearly four years due to sufficient potassium resources and similar chemical properties of potassium to lithium. Several works reported that N-doping on the carbon electrodes could efficiently improve the storage capacity of potassium ions. Herein, we synthesized two series of carbon spheres with the main difference is with or without N-doping. It is found that the storage of potassium ions is mainly determined by the crystal structure instead of N-doping. N-doping seems to affect the ion diffusion process, but the total capacity is still determined by the (0 0 2) lateral size of the carbon materials (L-a). The specific capacity increases as L-a increases. The N-doped carbon sphere with larger L-a of 8.32 nm, delivers a higher reversible capacity of 241 mAh g(-1) at a current density of 25 mA g(-1). And it still remains 121 mAh g(-1) after 100 cycles at a current density of 100 mA g(-1).