摘要
Carbonaceous nanomaterials with porous structure have become the highly promising anode materials for potassium-ion batteries(PIBs)due to their abundant resources,low-cost,and excellent conductivity.Nevertheless,the sluggish reaction kinetics and inferior cycling life caused by the large radius of K ions severely restrict their commercial development.Herein,B,N co-doped hierarchically porous carbon nanosheets(BNPC)are achieved via a facile template-assisted route,followed by a simple one-step carbonization process.The resultant BNPC possesses a unique porous structure,large surface area,and high-level B,N co-doping.The structural features endows it with remarkable potassium storage performances,which delivers a high reversible capacity(242.2 mA h/g at100 m A/g after 100 cycles),and long cycling stability(123.1 m Ah/g at 2000 m A/g and 62.9 m Ah/g at5000 mA/g after 2000 cycles,respectively).Theoretical simulations further validate that the rich B doping into N-modified carbon configuration can greatly boost the potassium storage capability of the BNPC anode.
基金
supported by Shuguang Program from Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.18SG035)
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University(No.KF2015)。
