期刊
ELECTROCHIMICA ACTA
卷 306, 期 -, 页码 446-453出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.165
关键词
Biomass-derived carbon; Loofah; Potassium ion battery; Lithium ion battery; Chemical diffusion coefficient
资金
- National Natural Science Foundation of China [51502032, 21603094]
- Fundamental Research Funds for the Central Universities, China [ZYGX2016J044]
- Opening Project of State Key Laboratory of Advanced Chemical Power Sources [SKL-ACPS-C-12]
- Basic Research Project of the Science and Technology Innovation Commission of Shenzhen [JCYJ20170817110251498]
- Guangdong Special Support for the Science and Technology Leading Young Scientist [2016TQ03C919]
In this work, we report a facile and inexpensive strategy to synthesize loofah-derived pseudo-graphite (LPG) through alkali treatment process followed by a one-step pyrolysis procedure. This mesoporous hard carbon material offers superb dual functionality for both lithium-ion battery (LIB) and potassiumion battery (KIB) anodes. Tested against lithium and potassium, LPG delivers a specific capacity of 225 mAh.g(-1) in LIBs and 150 mAh.g(-1) in KIBs after 200 cycles at the current density of 100 mA g(-1). The good performance of LPG for both LIBs and KIBs mainly originates from its dual storage mechanism. On one hand, wider layered pseudo-graphite units provide space for Li+/K+ intercalation at higher voltages (>0.17 V in LIBs, >0.56 V in KIBs). On the other hand, highly accessible mesoporous structure and defect-activated units in the near-surface region make it possible for Li+/K+ deposition at low voltages. The different performance of LPG in LIBs and KIBs may originate from varied ion-storage mechanisms. Despite the similar diffusion coefficient (D+), lower capacity of LPG for potassium can be contributed to its limited intercalation kinetics in higher voltage (>0.56 V) and evidently higher resistance in the charge-transfer process (R-ct). (c) 2019 Elsevier Ltd. All rights reserved.
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