期刊
ACS NANO
卷 13, 期 9, 页码 10643-10652出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b04916
关键词
delta-MnO2; zinc ion batteries; fast diffusion; high rate; self-healable
类别
资金
- GRF [CityU 11305218]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20170818103435068]
- National Natural Science Foundation of China [21771127]
While alpha-MnO2 has been intensively studied for zinc batteries, delta-MnO2 is usually believed to be more suitable for ion storage with its layered structure. Unfortunately, the extraordinary Zn ion storage performance that delta-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 delta-MnO2. Our results reveal that the resulted Zn//pre-intercalated delta-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-delta-MnO2, which can be self-healed after multiple catastrophic damages, emphasizing the advanced features of aqueous Zn ion battery for wearable applications.
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