CAJ | 학술논문

十年来的研究并没有对 LiFePO4的电化学反应机理形成准确一致的认识.复合阴离子(PO4)3-的应用使铁基化合物成为一种非常理想的锂离子电池正极备选材料.然而, LiFePO4的晶体结构却限制了其电导性与锂离子扩散性能,从而使材料的电化学性能下降.本文主要考虑充放电机理,相态转变,离子掺杂,锂离子扩散,电导,电解液,充放电动力学等因素的影响,从理论与实验角度综述了关于LiFePO4的电化学反应机理的研究进展.
십년래적연구병몰유대 LiFePO4적전화학반응궤리형성준학일치적인식.복합음리자(PO4)3-적응용사철기화합물성위일충비상이상적리리자전지정겁비선재료.연이, LiFePO4적정체결구각한제료기전도성여리리자확산성능,종이사재료적전화학성능하강.본문주요고필충방전궤리,상태전변,리자참잡,리리자확산,전도,전해액,충방전동역학등인소적영향,종이론여실험각도종술료관우LiFePO4적전화학반응궤리적연구진전.
The electrochemical mechanism of LiFePO4 as cathode material for lithium ion batteries during charging and discharging is still under debate after ten years of research. The use of polyanion, (PO4)3-, makes it possible for iron-based compound to be one of the potential promising cathode material for lithium ion batteries. However, the interior structure of LiFePO4 determines the diffusion of electrons and lithium ions, and therefore deteriorate its electrochemical performance. From theoretical part and the aspect of practices of experiment, inner reactions during the processes of charging/discharging, phases transition, ion-doping, diffusion of lithium ions, conductivity, interactions between cathode material and electrolytes and the electrochemical kinetic of LiFePO4 based lithium ion batteries are described in this paper.