Di Lecce Daniele, Fasciani Chiara, Scrosati Bruno, Hassoun Jusef
Dipartimento di Chimica, Sapienza Università di Roma , P.le Aldo Moro 5, 00185 Rome, Italy.
Istituto Italiano di Tecnologia , 00161 Rome, Italy.
ACS Appl Mater Interfaces. 2015 Sep 30;7(38):21198-207. doi: 10.1021/acsami.5b05179. Epub 2015 Sep 17.
Safety and environmental issues, because of the contemporary use of common liquid electrolytes, fluorinated salts, and LiCoO2-based cathodes in commercial Li-ion batteries, might be efficiently mitigated by employing alternative gel-polymer battery configurations and new electrode materials. Herein we study a lithium-ion polymer cell formed by combining a LiMn0.5Fe0.5PO4 olivine cathode, prepared by simple solvothermal pathway, a nanostructured Sn-C anode, and a LiBOB-containing PVdF-based gel electrolyte. The polymer electrolyte, here analyzed in terms of electrochemical stability by impedance spectroscopy (EIS) and voltammetry, reveals full compatibility for cell application. The LiBOB electrolyte salt and the electrochemically delithiaded Mn0.5Fe0.5PO4 have a higher thermal stability compared to conventional LiPF6 and Li0.5CoO2, as confirmed by thermogravimetric analysis (TGA) and by galvanostatic cycling at high temperature. LiMn0.5Fe0.5PO4 and Sn-C, showing in lithium half-cell a capacity of about 120 and 350 mAh g(-1), respectively, within the gelled electrolyte configuration are combined in a full Li-ion polymer battery delivering a stable capacity of about 110 mAh g(-1), with working voltage ranging from 2.8 to 3.6 V.
由于目前商用锂离子电池中普遍使用液体电解质、氟化盐和基于LiCoO₂的阴极，安全和环境问题可以通过采用替代的凝胶聚合物电池配置和新型电极材料得到有效缓解。在此，我们研究了一种锂离子聚合物电池，它由通过简单溶剂热法制备的LiMn₀.₅Fe₀.₅PO₄橄榄石阴极、纳米结构的Sn-C阳极和含LiBOB的PVdF基凝胶电解质组成。通过阻抗谱（EIS）和伏安法对聚合物电解质进行电化学稳定性分析，结果表明其与电池应用完全兼容。热重分析（TGA）和高温恒电流循环证实，LiBOB电解质盐和电化学脱锂的Mn₀.₅Fe₀.₅PO₄相比传统的LiPF₆和Li₀.₅CoO₂具有更高的热稳定性。在凝胶电解质配置中，LiMn₀.₅Fe₀.₅PO₄和Sn-C在锂半电池中的容量分别约为120和3 mAh g⁻¹，它们被组合在一个全锂离子聚合物电池中，该电池可提供约110 mAh g⁻¹的稳定容量，工作电压范围为2.8至3.6V。
