Nitrogen Doped Multi-channel Graphite for High Rate and High Capacity Li Ion Battery
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第1期
论文作者：张红娜 WU Xiaoqiang 李荣辉
文章页码：65 - 70
摘 要：Nitrogen doped multi-channel graphite was successfully prepared by using nitrogen doping and KOH etching technologies. The three-electrode and EIS tests indicates that the etched graphite possesses lower electrochemical resistance than the pristine graphite. The coin cell tests demonstrate that N doped multichannel graphite possesses a specific capacity of 361 m Ah/g and coulombic efficiencies of 91.4%. No dramatic irreversible capacity loss results from the increased specific surface area（from 1.60 to 2.08 m2/g）, removing the need for a trade-off between irreversible capacity loss and surface area. Full polymer cells were fabricated and electrochemical capabilities were measured. In 3 C fast charge protocol, the charging capacity can reach 51% within 10 min charge, and 100% within 30 min, demonstrating excellent fast charging characteristic. The fast charge cycle performance with 3 C-rate charge and 1 C-rate discharge from 4.35-3.0 V was conducted at RT temperature. The capacity retention is 94% after 600 cycles, which shows good cycle performance.
张红娜1，WU Xiaoqiang2，李荣辉3
1. Collage of Physics and Electronic Information, Inner Mongolia University for the Nationalities2. Collage of Mechanical Engineering, Inner Mongolia University for the Nationalities3. School of Gemology and Material Technology, Hebei GEO University
摘 要：Nitrogen doped multi-channel graphite was successfully prepared by using nitrogen doping and KOH etching technologies. The three-electrode and EIS tests indicates that the etched graphite possesses lower electrochemical resistance than the pristine graphite. The coin cell tests demonstrate that N doped multichannel graphite possesses a specific capacity of 361 m Ah/g and coulombic efficiencies of 91.4%. No dramatic irreversible capacity loss results from the increased specific surface area（from 1.60 to 2.08 m2/g）, removing the need for a trade-off between irreversible capacity loss and surface area. Full polymer cells were fabricated and electrochemical capabilities were measured. In 3 C fast charge protocol, the charging capacity can reach 51% within 10 min charge, and 100% within 30 min, demonstrating excellent fast charging characteristic. The fast charge cycle performance with 3 C-rate charge and 1 C-rate discharge from 4.35-3.0 V was conducted at RT temperature. The capacity retention is 94% after 600 cycles, which shows good cycle performance.
关键词：
