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All-solid-state batteries stabilized with electro-mechano-mediated phosphorus anodes
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DOI：10.1039/D4EE05704J.png)
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Abstract
En 中文
Aggressive anodes like Li metal and silicon promise high-energy; all-solid-state lithium batteries (ASSLBs) but are restricted by dendritic lithium growth. Ideally; anodes should inherently resist dendritic growth while offering high specific energy. Herein; we describe a class of resource-abundant and dendrite-resistant phosphorus anodes for high-areal-capacity; all-solid-state lithium batteries (ASSLBs). This is achieved by leveraging phosphorus's well-balanced redox potential which thermodynamically mitigates lithium plating while offering high energy. Importantly; we present an electro-mechano-mediation strategy based on compositing engineering to simultaneously promote the charge transport and chemo-mechanical behavior of the phosphorus electrode. As a proof-of-concept; we demonstrated a P/Sb anode wherein the Sb/LixSb filler – mixed conducting; stiff; and low-volume-breathing – not only promotes percolated electron/ion transport (electro-mediation effect); but also constrains the volume changes of P/Li3P and suppresses crack formation in the electrode (mechano-mediation effect). Impressively; the anode delivers 340 mA h g−1 at an extreme rate of 30C (90 mA cm−2; 60 °C); and shows remarkable stability retaining 64.0% capacity after 10 000 cycles at 10C. Furthermore; full cells loaded with 53.5 mg cmLiCoO2−2 deliver a high areal capacity of 6.4 mA h cm−2 at C/5 and retain 90.0% capacity over 800 cycles at C/2 (25 °C). Our work represents a unique perspective for exploiting high-capacity; dendrite-resistant anode materials which are resourcefully sustainable but have been historically deemed unsuitable for high-energy all-solid-state batteries.
Keywords:
phosphorus anode
dendrite-resistant
all-solid-state lithium batteries
high areal capacity
electro-mechano-mediation
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