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Enhanced Electrochemistry of Carbon Supported Functionalized Nanocomposite Cathode for Aqueous Lithium‐ion Batteries
Electroanalysis ( IF 3 ) Pub Date : 2020-10-07 , DOI: 10.1002/elan.202060386
Shane Willenberg 1 , Natasha Ross 1
Affiliation  

A novel carbon supported LiMn2O4 nanocomposite framework has been explored to resolve multiple barriers associated with lithium manganese oxide cathodes for aqueous LIB systems. Here, we have successfully synthesized an architecturally stable AlF3−LiMn2O4/rGO composite with improved electron transfer kinetics and CV peak currents proportional to the square root of scan rate. The synergy between graphene and aluminium trifluoride enhances the intrinsic electrochemical properties of pristine LiMn2O4 (LMO) and reduced Mn+3 dissolution. The unique composite effectively reduced Li+ diffusion distances with less polarization as it effectively accommodates the structural transformation during Li+ ion charge and discharge. The electrochemical interrogation revealed faster charge transportation and decrease in charge transfer resistance due to inhibition of the pronounced pile‐up of Li+ ions and undesired Mn3+ ions on the surfaces. The electrochemical performances were tested in LiNO3 aqueous electrolyte and the cell delivered a capacity of 90 mA h g−1 based on the total weight of the active electrode materials. This aqueous LIB cathode system provides a promising alternative for safe, cost‐effective and scalable energy storage with tolerance against misuse.

中文翻译:

碳载功能化锂离子电池纳米复合正极的增强电化学性能

已探索出一种新型的碳载LiMn 2 O 4纳米复合材料框架,以解决与锂锰氧化物阴极有关的水性LIB系统的多个障碍。在这里,我们成功地合成了结构稳定的AlF 3 -LiMn 2 O 4 / rGO复合材料,该复合材料具有改进的电子传输动力学和与扫描速率平方根成比例的CV峰值电流。石墨烯和三氟化铝之间的协​​同作用增强了原始LiMn 2 O 4(LMO)的固有电化学性能,并降低了Mn +3的溶解。独特的复合材料有效还原了Li +极化距离较小的扩散距离,因为它有效地适应了Li +离子充放电期间的结构转变。电化学查询显示,由于抑制了Li +离子和表面不希望的Mn 3+离子的明显堆积,因此电荷传输更快,并且电荷转移电阻降低。在LiNO 3水性电解质中测试了电化学性能,并且基于活性电极材料的总重量,电池传递的容量为90 mA h g -1。这种水性LIB阴极系统为安全,经济高效且可扩展的能量存储提供了一种有前途的替代方案,并且可以容忍滥用。
更新日期:2020-12-01
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