期刊
ADVANCED MATERIALS
卷 32, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201905681
关键词
anion intercalation; dendrite-free; dual-ion batteries; graphite cathodes; Zn batteries
类别
资金
- ERC [768930]
- Federal State of Saxony (ESF-Project GRAPHD, TU Dresden)
- EC under the Graphene Flagship [CNECT-ICT-604391]
- European Research Council (ERC) [768930] Funding Source: European Research Council (ERC)
The intrinsic advantages of metallic Zn, like high theoretical capacity (820 mAh g(-1)), high abundance, low toxicity, and high safety have driven the recent booming development of rechargeable Zn batteries. However, the lack of high-voltage electrolyte and cathode materials restricts the cell voltage mostly to below 2 V. Moreover, dendrite formation and the poor rechargeability of the Zn anode hinder the long-term operation of Zn batteries. Here a high-voltage and durable Zn-graphite battery, which is enabled by a LiPF6-containing hybrid electrolyte, is reported. The presence of LiPF6 efficiently suppresses the anodic oxidation of Zn electrolyte and leads to a super-wide electrochemical stability window of 4 V (vs Zn/Zn2+). Both dendrite-free Zn plating/stripping and reversible dual-anion intercalation into the graphite cathode are realized in the hybrid electrolyte. The resultant Zn-graphite battery performs stably at a high voltage of 2.8 V with a record midpoint discharge voltage of 2.2 V. After 2000 cycles at a high charge-discharge rate, high capacity retention of 97.5% is achieved with approximate to 100% Coulombic efficiency.
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