Li-ion capacitor based on activated rice husk derived porous carbon with improved electrochemical performance

被引：58
作者：
Babu, Binson [1 ]
Lashmi, P. G. [1 ]
Shaijumon, M. M. [1 ]
机构：
[1] Indian Inst Sci Educ & Res Thiruvananthapuram, Sch Phys, CET Campus, Thiruvananthapuram 695016, Kerala, India
来源：
ELECTROCHIMICA ACTA | 2016年 / 211卷
关键词：
Lithium ion capacitor; Activated carbon; Power density; Energy density; Lithium titanate; ENERGY DENSITY; CATHODE MATERIAL; HIGH-POWER; SUPERCAPACITOR; ELECTRODES; STORAGE; LI4TI5O12; GRAPHENE; NANOSHEETS; BATTERIES;
D O I：
10.1016/j.electacta.2016.06.055
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
We report the fabrication of a high energy-power density Li-ion hybrid supercapacitor (Li-HSC) using rice husk derived activated porous carbon as cathode and insertion type Li4Ti5O12 (LTO) as anode. Nanoporous carbon chemically activated with KOH (RHDPC-KOH) and H3PO4 (RHDPC-H3PO4) exhibited high surface area and improved porosity characteristics. With optimized electrode mass loading, the fabricated Li-HSC exhibited excellent electrochemical properties with a maximum energy density of similar to 57 Wh kg similar to 1 and similar to 37Wh kg(-1) for LTO/RHDPC-KOH and LTO/RHDPC-H3PO4 configuration respectively. The obtained energy density of 45 Wh kg(-1) for RHDPC-KOH -based Li-HSC, even at a high power density of similar to 4.3 kW kg(-1), is far superior to several porous carbon-based Li-ion capacitors reported. Furthermore, the device showed excellent cyclability with capacity retention of similar to 92% of initial capacity even after 2000 cycles, at high current density of 2 Ag-1. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：289 / 296
页数：8
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