Fast and stable K-ion storage enabled by synergistic interlayer and pore-structure engineering  

作　　者：Deping Li Qing Sun Yamin Zhang Xinyue Dai Fengjun Ji Kaikai Li Qunhui Yuan Xingjun Liu Lijie Ci 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,School of Materials Science and Engineering,Harbin Institute of Technology(shenzhen),Shenzhen,518055,China [2]Research Center for Carbon Nanomaterials,Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education),School of Materials Science and Engineering,Shandong University,Jinan,250061,China

出　　处：《Nano Research》2021年第12期4502-4511,共10页纳米研究（英文版）

基　　金：This work was supported by School Research Startup Expenses of Harbin Institute of Technology(Shenzhen)(No.DD29100027);the National Natural Science Foundation of China(No.52002094);Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110756);China Postdoctoral Science Foundation(No.2019M661276);High-level Talents’Discipline Construction Fund of Shandong University(No.31370089963078).

摘　　要：Carbon-based material has been regarded as one of the most promising electrode materials for potassium-ion batteries(PIBs).However,the battery performance based on reported porous carbon electrodes is still unsatisfactory,while the in-depth K-ion storage mechanism remains relatively ambiguous.Herein,we propose a facile“in situ self-template bubbling”method for synthesizing interlayer-tuned hierarchically porous carbon with different metallic ions,which delivers superior K-ion storage performance,especially the high reversible capacity(360.6 mAh·g^(−1)@0.05 A·g^(−1)),excellent rate capability(158.6 mAh·g^(−1)@10.0 A·g^(−1))and ultralong high-rate cycling stability(82.8%capacity retention after 2,000 cycles at 5.0 A·g^(−1)).Theoretical simulation reveals the correlations between interlayer distance and K-ion diffusion kinetics.Experimentally,deliberately designed consecutive cyclic voltammetry(CV)measurements,ex situ Raman tests,galvanostatic intermittent titration technique(GITT)method decipher the origin of the excellent rate performance by disentangling the synergistic effect of interlayer and pore-structure engineering.Considering the facile preparation strategy,superior electrochemical performance and insightful mechanism investigations,this work may deepen the fundamental understandings of carbon-based PIBs and related energy storage devices like sodium-ion batteries,aluminum-ion batteries,electrochemical capacitors,and dual-ion batteries.

关 键 词：potassium-ion batteries synergistic interlayer and pore-structure engineering theoretical calculations carbonaceous electrode ex situ Raman technique 

分 类 号：TM910.4[电气工程—电力电子与电力传动]