CAJ | 학술논문

对常用的两层电极(活性材料层|集电极)进行改进，提出一种新颖的夹心状三层电极(导电材料层|活性材料层|集电极)以提高 LiFePO4/C 的电化学性能。充放电测试表明：相比两层电极，三层电极中 LiFePO4/C 表现出更优的倍率性能。循环伏安和电化学阻抗测试表明：相比两层电极，三层电极中LiFePO4/C材料中的Fe3+/Fe2+氧化还原电对表现出更快的氧化还原速度。更好的可逆性能以及更低的电荷转移阻抗。在三层电极中，活性材料层表层中与LiFePO4/C颗粒尺寸相当的孔洞被粒径小得多的乙炔黑微粒填充，形成LiFePO4/C颗粒间的导电连接，为暴露在电解液主体LiFePO4/C颗粒中的LiFePO4晶体提供更多运输电子到达或离开的路径。
대상용적량층전겁(활성재료층|집전겁)진행개진，제출일충신영적협심상삼층전겁(도전재료층|활성재료층|집전겁)이제고 LiFePO4/C 적전화학성능。충방전측시표명：상비량층전겁，삼층전겁중 LiFePO4/C 표현출경우적배솔성능。순배복안화전화학조항측시표명：상비량층전겁，삼층전겁중LiFePO4/C재료중적Fe3+/Fe2+양화환원전대표현출경쾌적양화환원속도。경호적가역성능이급경저적전하전이조항。재삼층전겁중，활성재료층표층중여LiFePO4/C과립척촌상당적공동피립경소득다적을결흑미립전충，형성LiFePO4/C과립간적도전련접，위폭로재전해액주체LiFePO4/C과립중적LiFePO4정체제공경다운수전자도체혹리개적로경。
As an improvement on the conventional two-layer electrode (active material layer|current collector), a novel sandwich-like three-layer electrode (conductive layer|active material layer|current 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.