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首页> 外文期刊>Journal of Materials Science >In-situ thermal polymerization of rechargeable lithium batteries with poly(methyl methacrylate) based gel-polymer electrolyte
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In-situ thermal polymerization of rechargeable lithium batteries with poly(methyl methacrylate) based gel-polymer electrolyte

机译：可充电锂电池与基于聚甲基丙烯酸甲酯的凝胶聚合物电解质的原位热聚合

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摘要

By heating the admixture of a commercial liquid electrolyte (LB302, 1 M solution of LiPF6 in 1:1 EC/DEC), methyl methacrylate (MMA) and benzoyl peroxide (BPO, initiator), a poly(methyl methacrylate) (PMMA) based gel-polymer electrolyte (GPE) was obtained. AC impedance spectroscopy and cyclic voltammetry were used to evaluate its ionic conductivity and electrochemical stability window. Rechargeable cells LiNi0.8Co0.2O2/Li and LiNi0.8Co0.2O2/graphite with this MMA based GPE were also fabricated via the in-situ thermal polymerization process. This GPE exhibits a high ionic conductivity (over 10(-3)S cm(-1)) at room temperature. It is stable in the voltage range between 0 and 4.2 V (vs. Li+/Li). A phenomenon of large initial cell impedance (LICI) was observed for the LiNi0.8Co0.2O2/Li cells but not in LiNi0.8Co0.2O2/graphite cells. After the first several cycles, the cell impedance decreases substantially and reversible charge-discharge capacity can be obtained. This in-situ polymerization method provides a way to produce GPE cells.
机译：通过加热市售液体电解质（LB302，LiPF6在1：1 EC / DEC中的1 M溶液），甲基丙烯酸甲酯（MMA）和过氧化苯甲酰（BPO，引发剂）的混合物，聚甲基丙烯酸甲酯（PMMA）获得凝胶聚合物电解质（GPE）。使用交流阻抗谱和循环伏安法评估其离子电导率和电化学稳定性窗口。还通过原位热聚合工艺制造了具有这种基于MMA的GPE的可充电电池LiNi0.8Co0.2O2 / Li和LiNi0.8Co0.2O2 /石墨。这种GPE在室温下具有很高的离子电导率（超过10（-3）S cm（-1））。在0至4.2 V（vs. Li + / Li）之间的电压范围内，它是稳定的。 LiNi0.8Co0.2O2 / Li电池观察到较大的初始电池阻抗（LICI）现象，而LiNi0.8Co0.2O2 /石墨电池则未观察到。在最初的几个循环之后，电池阻抗会大大降低，并且可以获得可逆的充放电容量。这种原位聚合方法提供了一种生产GPE细胞的方法。

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