A High-Voltage, Dendrite-Free, and Durable Zn–Graphite Battery

Wang G, Kohn B, Scheler U, Wang F, Oswald S, Loeffler M, Tan D, Zhang P, Zhang J, Feng X (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Advanced Materials Wiley

Book Volume: 32

Article Number: 1905681

Journal Issue: 4

DOI: 10.1002/adma.201905681

Abstract

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 ≈100% Coulombic efficiency.

Involved external institutions

Technische Universität Dresden DE Germany (DE) Leibniz-Institut für Polymerforschung Dresden e. V. DE Germany (DE) Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE)

How to cite

APA:

Wang, G., Kohn, B., Scheler, U., Wang, F., Oswald, S., Loeffler, M.,... Feng, X. (2020). A High-Voltage, Dendrite-Free, and Durable Zn–Graphite Battery. Advanced Materials, 32(4). https://doi.org/10.1002/adma.201905681

MLA:

Wang, Gang, et al. "A High-Voltage, Dendrite-Free, and Durable Zn–Graphite Battery." Advanced Materials 32.4 (2020).

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