Recently,rechargeable aqueous zinc-based batteries using manganese oxide as the cathode(e.g.,MnO_(2))have gained attention due to their inherent safety,environmental friendliness,and low cost.Despite their potential,a...Recently,rechargeable aqueous zinc-based batteries using manganese oxide as the cathode(e.g.,MnO_(2))have gained attention due to their inherent safety,environmental friendliness,and low cost.Despite their potential,achieving high energy density in Zn||MnO_(2)batteries remains challenging,highlighting the need to understand the electrochemical reaction mechanisms underlying these batteries more deeply and optimize battery components,including electrodes and electrolytes.This review comprehensively summarizes the latest advancements for understanding the electrochemistry reaction mechanisms and designing electrodes and electrolytes for Zn||MnO_(2)batteries in mildly and strongly acidic environments.Furthermore,we highlight the key challenges hindering the extensive application of Zn||MnO_(2)batteries,including high-voltage requirements and areal capacity,and propose innovative solutions to overcome these challenges.We suggest that MnO_(2)/Mn^(2+)conversion in neutral electrolytes is a crucial aspect that needs to be addressed to achieve high-performance Zn||MnO_(2)batteries.These approaches could lead to breakthroughs in the future development of Zn||MnO_(2)batteries,off ering a more sustainable,costeff ective,and high-performance alternative to traditional batteries.展开更多
为解决MnO_(2)在锌离子电池充放电中导电性差的问题,将MnO_(2)与碳纳米纤维复合以提高MnO_(2)的导电性,通过微观核壳结构的设计改善MnO_(2)充放电过程中的溶解问题。以静电纺丝和退火相结合的方法成功制备了碳纳米纤维,采用湿化学方法...为解决MnO_(2)在锌离子电池充放电中导电性差的问题,将MnO_(2)与碳纳米纤维复合以提高MnO_(2)的导电性,通过微观核壳结构的设计改善MnO_(2)充放电过程中的溶解问题。以静电纺丝和退火相结合的方法成功制备了碳纳米纤维,采用湿化学方法和水热法使KMnO 4在碳纳米纤维的表面还原为MnO_(2)。XRD证实了α-MnO_(2)和β-MnO_(2)的存在且无杂质产生,SEM照片显示成功制备了核壳结构的C@MnO_(2)复合纳米纤维。电化学测试结果表明在0.1 A g恒流充放电下,循环100次仍有83%的容量保持率,且可提供163.89 mAh g的可观比容量。该长循环性能得益于碳纳米纤维与MnO_(2)的协同作用,导电性的碳纳米纤维作为骨架促进了电子转移动力学,而MnO_(2)纳米片提高了活性材料与电解液的接触面积,促进了Zn^(2+)扩散。此外,MnO_(2)与碳纳米纤维紧密连接在一起,形成了完整均一的结构也最大程度地改善了MnO_(2)在充放电过程中的体积变化与溶解问题。展开更多
文摘Recently,rechargeable aqueous zinc-based batteries using manganese oxide as the cathode(e.g.,MnO_(2))have gained attention due to their inherent safety,environmental friendliness,and low cost.Despite their potential,achieving high energy density in Zn||MnO_(2)batteries remains challenging,highlighting the need to understand the electrochemical reaction mechanisms underlying these batteries more deeply and optimize battery components,including electrodes and electrolytes.This review comprehensively summarizes the latest advancements for understanding the electrochemistry reaction mechanisms and designing electrodes and electrolytes for Zn||MnO_(2)batteries in mildly and strongly acidic environments.Furthermore,we highlight the key challenges hindering the extensive application of Zn||MnO_(2)batteries,including high-voltage requirements and areal capacity,and propose innovative solutions to overcome these challenges.We suggest that MnO_(2)/Mn^(2+)conversion in neutral electrolytes is a crucial aspect that needs to be addressed to achieve high-performance Zn||MnO_(2)batteries.These approaches could lead to breakthroughs in the future development of Zn||MnO_(2)batteries,off ering a more sustainable,costeff ective,and high-performance alternative to traditional batteries.
文摘为解决MnO_(2)在锌离子电池充放电中导电性差的问题,将MnO_(2)与碳纳米纤维复合以提高MnO_(2)的导电性,通过微观核壳结构的设计改善MnO_(2)充放电过程中的溶解问题。以静电纺丝和退火相结合的方法成功制备了碳纳米纤维,采用湿化学方法和水热法使KMnO 4在碳纳米纤维的表面还原为MnO_(2)。XRD证实了α-MnO_(2)和β-MnO_(2)的存在且无杂质产生,SEM照片显示成功制备了核壳结构的C@MnO_(2)复合纳米纤维。电化学测试结果表明在0.1 A g恒流充放电下,循环100次仍有83%的容量保持率,且可提供163.89 mAh g的可观比容量。该长循环性能得益于碳纳米纤维与MnO_(2)的协同作用,导电性的碳纳米纤维作为骨架促进了电子转移动力学,而MnO_(2)纳米片提高了活性材料与电解液的接触面积,促进了Zn^(2+)扩散。此外,MnO_(2)与碳纳米纤维紧密连接在一起,形成了完整均一的结构也最大程度地改善了MnO_(2)在充放电过程中的体积变化与溶解问题。
