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High Energy Density Single Crystal NMC/Li6PS5Cl Cathodes for All-Solid-State Lithium Metal Batteries

submitted on 24.04.2021, 08:22 and posted on 26.04.2021, 14:13 by Christopher Doerrer, Isaac Capone, Sudarshan Narayanan, Junliang Liu, Christopher Grovenor, Mauro Pasta, Patrick Grant

To match the high capacity of metallic anodes, all-solid-state batteries (ASSBs) re- quire high energy density, long-lasting composite cathodes such as Ni-Mn-Co (NMC)- based lithium oxides mixed with a solid-state electrolyte (SSE). However in practice, cathode capacity typically fades due to NMC cracking and increasing NMC/SSE in- terface debonding because of NMC pulverization, which is only partially mitigated by the application of a high cell pressure during cycling. Using smart processing proto- cols we report a single crystal particulate LiNi0.83Mn0.06Co0.11O2 and Li6PS5Cl SSE composite cathode with outstanding discharge capacity of 210 mAh g−1 at 30 °C. A first cycle coulombic efficiency of >85%, and >99% thereafter, was achieved despite a 5.5% volume change during cycling. A near-practical discharge capacity at a high areal capacity of 8.7 mAh cm−2 was obtained using a novel asymmetric anode/cathode cycling pressure of only 2.5 MPa/0.2 MPa.


The Faraday Institution

Engineering and Physical Sciences Research Council

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Sir Henry Royce Institute - Oxford Equipment

Engineering and Physical Sciences Research Council

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ISCF Faraday Challenge project SOLBAT [grant number FIRG007]


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University of Oxford


United Kingdom

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