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Methylcellulose/Polymethyl Methacrylate/Al2O3 Composite Polymer Matrix towards Ni-Rich Cathode/Lithium Metal Battery
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2021-08-19 , DOI: 10.1002/macp.202100234 Xun Zhang 1 , Yiming Sun 1 , Xiuping Yin 2 , Yue Ma 3 , Lianqi Zhang 3 , Defa Wang 1
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2021-08-19 , DOI: 10.1002/macp.202100234 Xun Zhang 1 , Yiming Sun 1 , Xiuping Yin 2 , Yue Ma 3 , Lianqi Zhang 3 , Defa Wang 1
Affiliation
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Gel polymer electrolyte (GPE) has attracted extensive interest due to superior interfacial compatibility, excellent plasticity, and improved electrochemical stability. Polymer matrix is of great importance to the performance of lithium metal battery, especially for Ni-rich cathode system with high working potential. Herein, a rigid-flexible composite polymer matrix comprising methylcellulose (MC), polymethyl methacrylate (PMMA), and Al2O3 is prepared. After saturated with the liquid electrolyte of 1 M LiDFOB in EC/DMC (1:1, v:v), the obtained GPE exhibits a high ionic conductivity of 0.20 × 10−3 S cm−1 and a wide electrochemical stable window up to 5.6 V. The synergistic effect of inorganic fillers and the ester groups on polymer matrix are conducive to the uniform deposition of Li-ion and advantageous to the formation of smooth and robust interfacial passivation layer. After assembled with Ni-rich cathode LiNi0.8Co0.15Al0.05O2 (NCA), a capacity of 158.1 mAh g−1 is maintained after 200 cycles at 0.1 C, while a high value of 133.1 mAh g−1 is delivered at 2 C. These results indicate that the as-prepared MC-PMMA-Al2O3 GPE (abbreviated as MPAA) is favorable for the interfacial compatibility of lithium metal batteries and shows superior electrochemical stability at high working voltage.
中文翻译：
甲基纤维素/聚甲基丙烯酸甲酯/Al2O3复合聚合物基体对富镍正极/锂金属电池
凝胶聚合物电解质（GPE）由于优异的界面相容性、优异的可塑性和改善的电化学稳定性而引起了广泛的兴趣。聚合物基体对锂金属电池的性能非常重要，特别是对于具有高工作电位的富镍正极体系。在此，制备了包含甲基纤维素(MC)、聚甲基丙烯酸甲酯(PMMA)和Al 2 O 3的刚柔复合聚合物基体。在 EC/DMC (1:1, v:v) 中用 1 M LiDFOB 的液体电解质饱和后，得到的 GPE 表现出 0.20 × 10 -3 S cm -1的高离子电导率和高达5.6 V的宽电化学稳定窗口。无机填料和酯基对聚合物基体的协同作用有利于锂离子的均匀沉积，有利于形成光滑、坚固的界面钝化层。与富镍正极 LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) 组装后，在 0.1 C 下循环 200 次后仍保持158.1 mAh g -1的容量，而在 2 C. 这些结果表明所制备的 MC-PMMA-Al 2 O 3GPE（简称MPAA）有利于锂金属电池的界面相容性，在高工作电压下表现出优异的电化学稳定性。
更新日期：2021-08-19
中文翻译：
甲基纤维素/聚甲基丙烯酸甲酯/Al2O3复合聚合物基体对富镍正极/锂金属电池
凝胶聚合物电解质（GPE）由于优异的界面相容性、优异的可塑性和改善的电化学稳定性而引起了广泛的兴趣。聚合物基体对锂金属电池的性能非常重要，特别是对于具有高工作电位的富镍正极体系。在此，制备了包含甲基纤维素(MC)、聚甲基丙烯酸甲酯(PMMA)和Al 2 O 3的刚柔复合聚合物基体。在 EC/DMC (1:1, v:v) 中用 1 M LiDFOB 的液体电解质饱和后，得到的 GPE 表现出 0.20 × 10 -3 S cm -1的高离子电导率和高达5.6 V的宽电化学稳定窗口。无机填料和酯基对聚合物基体的协同作用有利于锂离子的均匀沉积，有利于形成光滑、坚固的界面钝化层。与富镍正极 LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) 组装后，在 0.1 C 下循环 200 次后仍保持158.1 mAh g -1的容量，而在 2 C. 这些结果表明所制备的 MC-PMMA-Al 2 O 3GPE（简称MPAA）有利于锂金属电池的界面相容性，在高工作电压下表现出优异的电化学稳定性。
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