Promoting power density by cleaving LiCoO2 into nano-flake structure for high performance supercapacitor

被引:25
作者
Liu, Qipeng [1 ]
Javed, Muhammad Sufyan [1 ]
Zhang, Cuilin [1 ,2 ]
Li, Yanrong [1 ]
Hu, Chenguo [1 ]
Zhang, Chengshuang [1 ]
Lai, Meihui [1 ]
Yang, Qi [3 ]
机构
[1] Chongqing Univ, State Key Lab Mech Transmiss, Dept Appl Phys, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Coll Chem & Chem Engn, Chongqing 400044, Peoples R China
[3] CAEP, Res Ctr Laser Fus, Sci & Technol Plasma Phys Lab, Mianyang 621900, Peoples R China
基金
国家高技术研究发展计划(863计划);
关键词
ASYMMETRIC SUPERCAPACITORS; POROUS CARBON; PSEUDOCAPACITIVE CONTRIBUTIONS; CHARGE STORAGE; TIO2; ANATASE; GRAPHENE; ELECTRODE; CANDIDATE; CATHODE; ARRAYS;
D O I
10.1039/c6nr09959a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
LiCoO2 (LCO) usually can deliver high energy density but low power density in Li-ion batteries (LIBs). Whether LCO could be used as electrode material for high-performance supercapacitors is dependent on promoting its power density. Owing to Faradaic redox reactions taking place on its surfaces or inside crystals through ion intercalation/deintercalation from the surfaces, increasing the specific area of LCO is a key factor to promote its rate capability. Herein, we report a facile strategy to prepare LCO nano-flakes with high specific area exceeding that of currently used micro-scale particles in LIBs. LCO as a nano-flake structure is expected to have a high fraction of Li atom exposure, which benefits fast redox reactions taking place on the surfaces. An LCO-based electrode exhibits an excellent specific capacitance of 581.3 F g(-1) at 0.5 A g(-1), high power density of 2262 W kg(-1) at an energy density of 41.0 Wh kg(-1), and good cycling stability (83.9% capacitance retention at 6 A g(-1) after 2000 cycles) in LiCl aqueous electrolyte. Faradaic redox behaviors have been analyzed, indicating an ideal diffusion-controlled process. Moreover, a full solid-state symmetric supercapacitor is assembled using LCO nano-flake-based electrodes, which presents good performance with light weight and flexibility. Impressively, three charged supercapacitors in series can light 100 green light emitting diodes for 14 min. LCO in nano-flake structure form with high power density could be an excellent material for superior supercapacitors.
引用
收藏
页码:5509 / 5516
页数:8
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