Electrochemical kinetics of nanostructure LiFePO4/graphitic carbon electrodes

被引：23

作者：

Kisu, Kazuaki ^{[1
,2
]}

Iwama, Etsuro ^{[1
,2
]}

Naoi, Wako ^{[3
]}

Simon, Patrice ^{[2
,4
,5
]}

Naoi, Katsuhiko ^{[1
,2
,3
,6
]}

机构：

[1] Tokyo Univ Agr & Technol, Dept Appl Chem, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan

[2] Tokyo Univ Agr & Technol, Inst Global Innovat Res, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan

[3] K&W Inc, Div Art & Innovat Technol, 1-3-16-901 Higashi, Kunitachi, Tokyo 1860002, Japan

[4] Univ Paul Sabatier Toulouse III, Inst Carnot CIRIMAT, UMR 5085, 118 Route Narbonne, F-31602 Toulouse 9, France

[5] FR CNRS 3459, RS2E, Paris, France

[6] Tokyo Univ Agr & Technol, Adv Capacitor Res Ctr, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2016年 / 72卷

关键词：

Defective lithium iron phosphate; Core/shell structure; Pseudocapacitive behavior; Ultrafast performance; Hybrid supercapacitor; Cavity microelectrode; ENERGY-STORAGE; ULTRAFAST CHARGE; TIO2; ANATASE; LIFEPO4; SUPERCAPACITORS; INTERCALATION; CAPACITORS; VOLTAMMETRY; DISCHARGE; NB2O5;

D O I：

10.1016/j.elecom.2016.08.013

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Lithium cation insertion/deinsertion reaction kinetics in a LiFePO4 (LFP)/graphitic carbon composite material were electrochemically studied with a cavity microelectrode (CME). The LFP/graphitic carbon composite has a core LFP (crystalline/amorphous)/graphitic carbon shell structure. In the crystalline and amorphous LFP phase, different reaction mechanisms were observed and characterized. While the reaction mechanism in the crystalline LFP phase is controlled by Li+ diffusion, the amorphous LFP phase shows a fast, surface-controlled, pseudocapacitive charge-storage mechanism. This pseudocapacitive behavior is extrinsic in origin since it comes from the presence of Fe3+ defects in the structure. These features explain the ultrafast performance of the material which offers interesting opportunities as a positive electrode for assembling high power and high energy hybrid supercapacitors. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：10 / 14

页数：5

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