Improving electrochemical performances of LiFePO_4 /C cathode material via a novel three-layer electrode
利用新颖的三层电极提高LiFePO_4/C正极材料的电化学性能(英文)作者机构：昆明理工大学冶金与能源工程学院昆明650093 中南大学冶金与环境学院长沙410083
出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)
年 卷 期：2013年第23卷第11期
页 面：3324-3329页
核心收录：
基 金：Project(2010ZCO51)supported by Natural Science Foundation of Yunnan Province Project supported by Analysis and Testing Foundation(2009-041) Starting Research Fund(14118245)from Kunming University of Science and Technology
主 题：lithium ion cells LiFePO4 cathode electrode configuration three-layer electrode electrochemical performances
摘 要：As an improvement on the conventional two-layer electrode （active material layerlcurrent collector）, a novel sandwich-like three-layer electrode （conductive layerlactive material layertcurrent collector） for cathode material LiFePO4/C was introduced in order to improve its electrochemical performance. LiFePO4/C in the three-layer electrode exhibited superior rate capability in comparison with that in the two-layer electrode in accordance with charge-discharge examination. Cyclic voltammetry and electrochemical impedance spectroscopy indicated that Fe3＋/Fe2＋ redox couple for LiFePO4 in the three-layer electrode displayed faster kinetics, better reversibility and much lower charge transfer resistance than that in the two-layer electrode in electrochemical process. For three-layer electrode, the holes in the surface of active material layer were filled by smaller acetylene black grains, which formed electrical connections and provided more pathways to electron transport to/from LiFePO4/C particles exposed to the bulk electrolyte.
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