All-solid-state batteries (ASSBs) with ceramic-based solid-state electrolyte (SSEs) is getting more say in the electrochemical energy storage field. Narrowly, researchers want to build a high safe battery with the non-flammable SSEs. More ambitiously, batteries with high voltage and paired with lithium metal anode are ultimate choices. Garnet-type SSE is regarded as a promising SSE due to its high lithium ion conductivity, wide electrochemical window and high stable with lithium metal anode. The rapid development of ASSBs, however, is significantly hampered by the large interfacial impedance as a matched lithium/ceramic interface is not easy to pursue. Currently most of the researchers focus on modification of garnet-type SSEs surface by Ge, Si , Al2O3 et.al. to fulfill a matched lithium/ceramic interface. Here, we succeed in synthesizing a lithium-carbon (Li-C) composite anode and show that dramatic changes in wettability with garnet-type SSE occur with the addition of graphite. By simply casting Li-C composite on garnet-type SSE, an intimate Li-C/garnet interface can be obtained to deliver a small interfacial resistance. We demonstrate operation of Li-C/garnet/Li-C symmetric cell under current density up to 0.3 mA/cm2, showing that stable plating/striping performance with voltage hysteresis as low as 40 mV is achievable and Li-C/garnet/LiFePO4 full cell exhibits comparative performance with non-aqueous eletrolyte type LIBs. The results demonstrate a promising technology to prepare a ceramic-compatible lithium metal-based anode and a low-impedance ASSBs.

Lithium-graphite paste: An interface compatible anode for solid-state batteries

2019 Spring National Meeting

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