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A Superior δ-MnO2 Cathode and a Self-Healing Zn-δ-MnO2 Battery.
ACS Nano ( IF 15.8 ) Pub Date : 2019-08-20 , DOI: 10.1021/acsnano.9b04916 Donghong Wang 1 , Lufeng Wang 2 , Guojin Liang 1 , Hongfei Li 1 , Zhuoxin Liu 1 , Zijie Tang 1 , Jianbo Liang 2 , Chunyi Zhi 1, 3
ACS Nano ( IF 15.8 ) Pub Date : 2019-08-20 , DOI: 10.1021/acsnano.9b04916 Donghong Wang 1 , Lufeng Wang 2 , Guojin Liang 1 , Hongfei Li 1 , Zhuoxin Liu 1 , Zijie Tang 1 , Jianbo Liang 2 , Chunyi Zhi 1, 3
Affiliation
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While α-MnO2 has been intensively studied for zinc batteries, δ-MnO2 is usually believed to be more suitable for ion storage with its layered structure. Unfortunately, the extraordinary Zn ion storage performance that δ-MnO2 should exhibit has not yet been achieved due to the frustrating structural degradation during charge-discharge cycles. Here, we found the Na ion and water molecules pre-intercalation can effectively activate stable Zn ion storage of δ-MnO2. Our results reveal that the resulted Zn//pre-intercalated δ-MnO2 battery delivers an extraordinarily high-rate performance, with a high capacity of 278 mAh g-1 at 1 C and up to 20 C, and a high capacity of 106 mAh g-1 can still be measured. The capacity retention is as high as 98% after charged-discharged up to 10,000 cycles benefiting from smooth Zn ion diffusion in the pre-intercalated structure. Further in situ/ex situ characterization confirms the superfast Zn ion diffusion in the pre-intercalated structure at room temperature. In addition, utilizing the well-chosen electrode material and modified polyurethane shell, we fabricated a quasi-solid-state healable Zn-δ-MnO2, which can be self-healed after multiple catastrophic damages, emphasizing the advanced features of aqueous Zn ion battery for wearable applications.
中文翻译：
优质δ-MnO2阴极和自修复Zn-δ-MnO2电池。
尽管已经对锌电池深入研究了α-MnO2，但通常认为δ-MnO2具有层状结构更适合于离子存储。不幸的是，由于在充放电循环中令人沮丧的结构退化，尚未实现δ-MnO2应该表现出的非凡的Zn离子存储性能。在这里，我们发现Na离子和水分子的预嵌入可以有效激活δ-MnO2的稳定Zn离子存储。我们的结果表明，所得的Zn //预嵌入δ-MnO2电池具有极高的速率性能，在1 C和高达20 C的条件下具有278 mAh g-1的高容量，并具有106 mAh的高容量g-1仍然可以测量。充放电达10次后，容量保持率高达98％，000个循环受益于预插入结构中的平滑Zn离子扩散。进一步的原位/异位表征证实了室温下预嵌入结构中超快的Zn离子扩散。此外，利用精选的电极材料和改性聚氨酯外壳，我们制造了准固态可修复的Zn-δ-MnO2，它在遭受多次灾难性破坏后可以自修复，强调了水性Zn离子电池的先进功能适用于可穿戴应用。
更新日期：2019-08-20
中文翻译：
优质δ-MnO2阴极和自修复Zn-δ-MnO2电池。
尽管已经对锌电池深入研究了α-MnO2，但通常认为δ-MnO2具有层状结构更适合于离子存储。不幸的是，由于在充放电循环中令人沮丧的结构退化，尚未实现δ-MnO2应该表现出的非凡的Zn离子存储性能。在这里，我们发现Na离子和水分子的预嵌入可以有效激活δ-MnO2的稳定Zn离子存储。我们的结果表明，所得的Zn //预嵌入δ-MnO2电池具有极高的速率性能，在1 C和高达20 C的条件下具有278 mAh g-1的高容量，并具有106 mAh的高容量g-1仍然可以测量。充放电达10次后，容量保持率高达98％，000个循环受益于预插入结构中的平滑Zn离子扩散。进一步的原位/异位表征证实了室温下预嵌入结构中超快的Zn离子扩散。此外，利用精选的电极材料和改性聚氨酯外壳，我们制造了准固态可修复的Zn-δ-MnO2，它在遭受多次灾难性破坏后可以自修复，强调了水性Zn离子电池的先进功能适用于可穿戴应用。
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