Journal Article

FZJ-2021-00940

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A robust, highly reversible, mixed conducting sodium metal anode

Cao, K. ; Ma, Q. (Corresponding author)FZJ* ; Tietz, F.FZJ* ; Xu, B. B. ; Yan, M. ; Jiang, Y. (Corresponding author)

2021
Science China Press [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27622  doi:10.1016/j.scib.2020.06.005

Abstract: Sodium metal anode holds great promise in pursuing high-energy and sustainable rechargeable batteries,but severely suffers from fatal dendrite growth accompanied with huge volume change. Herein, a robustmixed conducting sodium metal anode is designed through incorporating NaSICON-type solid Na-ionconductor into bulk Na. A fast and continuous pathway for simultaneous transportation of electronsand Na+ is established throughout the composite anode. The intimate contact between Na-ion conductingphase and Na metallic phase constructs abundant two-phase boundaries for fast redox reactions. Further,the compact configuration of the composite anode substantially protects Na metal from being corrodedby liquid organic electrolyte for the minimization of side reactions. Benefiting from the unique configuration,the composite anode shows highly reversible and durable Na plating/stripping behavior. The symmetriccells exhibit ultralong lifespan for over 700 h at 1 mA cm2 with a high capacity of 5 mAh cm2and outstanding rate capability up to 8 mA cm2 in the carbonate electrolyte. Full cells with Na3V2(PO4)3/C cathode demonstrate impressive cycling stability (capacity decay of 0.012% per cycle) and low charge/discharge polarization as well. This work provides new insights into rational design and development ofrobust sodium metal anode through an architecture engineering strategy for advanced rechargeablesodium batteries.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 122 - Elektrochemische Energiespeicherung (POF4-122) (POF4-122)

Appears in the scientific report 2021

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