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Electrochemical Performance Optimization of Layered P2‐Type Na0.67MnO2 through Simultaneous Mn‐Site Doping and Nanostructure Engineering
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-11-26 , DOI: 10.1002/batt.201900126 Bo Peng 1 , Zhihao Sun 1 , Shuhong Jiao 1 , Gongrui Wang 1 , Genqiang Zhang 1
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-11-26 , DOI: 10.1002/batt.201900126 Bo Peng 1 , Zhihao Sun 1 , Shuhong Jiao 1 , Gongrui Wang 1 , Genqiang Zhang 1
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Sodium‐ion batteries are considered as the most promising candidates for grid‐level energy storage applications due to its unique features of much lower cost and comparable energy density to lithium ion batteries. However, searching for suitable cathode materials with high capacity and good cycling stability are still the bottleneck issues due to the involved unmanageable phase transitions and difficult morphology control. Herein, unique fullerene‐like hollow polyhedrons of P2‐type Na0.67Ni0.15Mn0.85O2 cathode were successfully synthesized via a facile and scalable self‐template strategy, where largely enhanced electrochemical properties can be achieved compared to its bulk counterpart. It can deliver a high specific capacity of 101 mAh g−1 after 120 cycles at a rate of 100 mA g−1, reaching an excellent capacity retention of 96.8 %. The possible origins of the enhanced performance were further analyzed to be the synergistic effect of hollow interior and novel morphology of the polyhedron, leading to well exposed (002) planes, shorter diffusion path and better structural robust. Importantly, the full battery without pre‐sodiation treatment could deliver a high energy density of 133.1 Wh kg−1 based on the total mass of cathode and anode, which sheds a new light for designing high energy density sodium‐ion full batteries.
中文翻译：
Mn-Site掺杂和纳米结构工程优化P2型Na0.67MnO2层的电化学性能
钠离子电池由于其独特的特点是成本更低，能量密度与锂离子电池相当，因此被认为是电网级储能应用中最有希望的候选者。然而，由于涉及难以控制的相变和困难的形态控制，寻找具有高容量和良好循环稳定性的合适的阴极材料仍然是瓶颈问题。在此，P2型Na 0.67 Ni 0.15 Mn 0.85 O 2的独特的像富勒烯的空心多面体通过一种简便且可扩展的自模板策略成功地合成了阴极，与本体相比，该模板可以实现大大增强的电化学性能。在120次循环后，它可以100 mA g -1的速率提供101 mAh g -1的高比容量，达到了96.8％的出色容量保持率。进一步分析了增强性能的可能根源是空心内部和多面体的新形态的协同效应，从而导致良好暴露的（002）平面，较短的扩散路径和更好的结构坚固性。重要的是，未经预处理的完整电池可以提供133.1 Wh kg -1的高能量密度 基于阴极和阳极的总质量，这为设计高能量密度的钠离子充满电池提供了新的思路。
更新日期：2019-11-27
中文翻译：
Mn-Site掺杂和纳米结构工程优化P2型Na0.67MnO2层的电化学性能
钠离子电池由于其独特的特点是成本更低，能量密度与锂离子电池相当，因此被认为是电网级储能应用中最有希望的候选者。然而，由于涉及难以控制的相变和困难的形态控制，寻找具有高容量和良好循环稳定性的合适的阴极材料仍然是瓶颈问题。在此，P2型Na 0.67 Ni 0.15 Mn 0.85 O 2的独特的像富勒烯的空心多面体通过一种简便且可扩展的自模板策略成功地合成了阴极，与本体相比，该模板可以实现大大增强的电化学性能。在120次循环后，它可以100 mA g -1的速率提供101 mAh g -1的高比容量，达到了96.8％的出色容量保持率。进一步分析了增强性能的可能根源是空心内部和多面体的新形态的协同效应，从而导致良好暴露的（002）平面，较短的扩散路径和更好的结构坚固性。重要的是，未经预处理的完整电池可以提供133.1 Wh kg -1的高能量密度 基于阴极和阳极的总质量，这为设计高能量密度的钠离子充满电池提供了新的思路。
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