期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802386
关键词
diffusion coefficient of K ions; hierarchically N-doped porous carbon; potassium-ion batteries; superior rate capability and cyclability; surface-driven behavior
类别
资金
- Startup Funding of Distinguished Professorship of 1000 Talents Program [31370086963030]
- Taishan Scholar Program [11370085961006]
- Shandong Provincial Science and Technology Major Project [2016GGX104001, 2017CXGC1010, 2018JMRH0211]
- Fundamental Research Funds of Shandong University [2016JC005, 2017JC042, 2017JC010]
- Natural Science Foundation of Shandong Province [ZR2017MEM002]
Potassium-ion batteries (PIBs), using carbon materials as the anode, are regarded as a promising alternative to lithium-ion batteries owing to the feasible formation of stage-1 potassium intercalation compounds (KC8). However, due to the large radius of the potassium ion, graphite-based electrodes still suffer poor rate capability and insufficient cycling life. In this work, a hierarchically nitrogen-doped porous carbon (NPC) is reported for the first time. The NPC electrode delivers a high reversible capacity of 384.2 mAh g(-1) after 500 cycles at a current density of 0.1 A g(-1) and an outstanding rate capability of 185 mAh g(-1) at 10.0 A g(-1), which surpasses most of the reported carbonaceous electrodes in PIBs. The excellent performance can be ascribed to the surface-driven behavior dominated K-storage mechanism, which is verified by quantitative kinetics analysis. Theoretical simulation results further illuminate the enhanced K affinity in N-doped active sites, which accounts for the superior rate performance of the NPC electrode. In addition, galvanostatic intermittent titration technique measurements further quantify the diffusion coefficient of K ions. Considering the superior electrochemical performance of the electrode and comprehensive investigation of the K storage mechanism, this work can provide fundamental references for the subsequent research of potassium-ion batteries.
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