期刊
ADVANCED MATERIALS
卷 30, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201802949
关键词
dual-graphite batteries; dual-ion batteries; multifunctional batteries; polarity switchability
类别
资金
- ERC [768930]
- Federal State of Saxony (ESF-Project GRAPHD, TU Dresden)
- EC under the Graphene Flagship [CNECT-ICT-604391]
- MAXNET Energy Project
- European Research Council (ERC) [768930] Funding Source: European Research Council (ERC)
Multifunctional batteries with enhanced safety performance have received considerable attention for their applications at extreme conditions. However, few batteries can endure a mix-up of battery polarity during charging, a common wrong operation of rechargeable batteries. Herein, a polarity-switchable battery based on the switchable intercalation feature of graphite is demonstrated. The unique redox-amphoteric intercalation behavior of graphite allows a reversible switching of graphite between anode and cathode, thus enabling polarity-switchable symmetric graphite batteries. The large potential gap between anion and cation intercalation delivers a high midpoint device voltage (approximate to average voltage) of approximate to 4.5 V. Further, both the graphite anode and cathode are kinetically activated during the polarity switching. Consequently, polarity-switchable symmetric graphite batteries exhibit a remarkable cycling stability (96% capacity retention after 500 cycles), a high power density of 8.66 kW kg(-1), and a high energy density of 227 Wh kg(-1) (calculated based on the total weight of active materials in both anode and cathode), which are superior to other symmetric batteries and recently reported dual-graphite or dual-carbon batteries. This work will inspire the development of new multifunctional energy-storage devices based on novel materials and electrolyte systems.
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