TY - JOUR
T1 - Activated carbon by one-step calcination of deoxygenated agar for high voltage lithium ion supercapacitor
AU - Zhang, Ming
AU - Cheng, Junfang
AU - Zhang, Lixing
AU - Li, Yaoting
AU - Chen, Mao Sung
AU - Chen, Yao
AU - Shen, Zhongrong
N1 - Funding Information:
This work was financial supported by the Xiamen Municipal Bureau of Science and Technology (no. 3502Z20182023), the National Natural Science Foundation of China (no. 21905282), the State Key Laboratory of Structural Chemistry (no. 20190016), Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, and the State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology (no. P2019-014).
Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/3/9
Y1 - 2020/3/9
N2 - Hybrid lithium-ion supercapacitors combine the advantages of both the high power density of capacitors and the high energy density of lithium batteries, where activated carbon serves as a critical cathode material with an electric double-layer capacitance charge storage mechanism. Here, we have demonstrated that a new activated carbon, which was prepared by the calcination of deoxygenated agar, can greatly enhance the specific energy of the hybrid lithium-ion supercapacitor, assembling with a multilayer "protected-lithium anode" and 21 m LITFSI "water-in-salt" electrolyte. The obtained carbon material has a suitable pore volume and narrow pore-size distribution and shows a high specific surface area up to 1672 m2 g-1 and a high specific capacitance of 210.4 F gAC -1 in "water-in-salt" electrolyte. The assembled hybrid lithium-ion supercapacitor shows a high specific energy of 308.3 W h kgAC -1 at a specific power of 0.7 kW kgAC -1. In addition, it presents an encouraging 89% retention of the initial specific energy after 8000 charge/discharge cycles. The improvement can be attributed to the high surface area of the carbon material and its narrow pore-size distribution, the wide operation potential window of "water-in-salt" electrolyte, and the high cell working voltage by using protected-lithium anode.
AB - Hybrid lithium-ion supercapacitors combine the advantages of both the high power density of capacitors and the high energy density of lithium batteries, where activated carbon serves as a critical cathode material with an electric double-layer capacitance charge storage mechanism. Here, we have demonstrated that a new activated carbon, which was prepared by the calcination of deoxygenated agar, can greatly enhance the specific energy of the hybrid lithium-ion supercapacitor, assembling with a multilayer "protected-lithium anode" and 21 m LITFSI "water-in-salt" electrolyte. The obtained carbon material has a suitable pore volume and narrow pore-size distribution and shows a high specific surface area up to 1672 m2 g-1 and a high specific capacitance of 210.4 F gAC -1 in "water-in-salt" electrolyte. The assembled hybrid lithium-ion supercapacitor shows a high specific energy of 308.3 W h kgAC -1 at a specific power of 0.7 kW kgAC -1. In addition, it presents an encouraging 89% retention of the initial specific energy after 8000 charge/discharge cycles. The improvement can be attributed to the high surface area of the carbon material and its narrow pore-size distribution, the wide operation potential window of "water-in-salt" electrolyte, and the high cell working voltage by using protected-lithium anode.
KW - High voltage
KW - Hybrid lithium ion supercapacitor
KW - Porous carbon
KW - Protected lithium anode
KW - Water-in-salt
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U2 - 10.1021/acssuschemeng.9b06347
DO - 10.1021/acssuschemeng.9b06347
M3 - Article
AN - SCOPUS:85082165923
SN - 2168-0485
VL - 8
SP - 3637
EP - 3643
JO - ACS Sustainable Chemistry and Engineering
JF - ACS Sustainable Chemistry and Engineering
IS - 9
ER -
