Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 51, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202106608
Keywords
anode-free batteries; Li-metal; solid-state batteries; zero-excess
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Funding
- German Federal Ministry of Education and Research (BMBF) [03XP0173D]
- European Union [875029]
- project OptiEx (BMBF ProZell-Cluster) [03XP0294B]
- Projekt DEAL
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The development of high-energy density rechargeable batteries is crucial for decarbonizing transportation. Anode-free Li-ion batteries offer the highest volumetric energy density among all cell configurations, but face challenges including low efficiencies and short cycle life. Recent studies have shown that anode-free solid-state batteries combine high energy density and safety, exceeding 1000 cycles.
The development of rechargeable batteries with high-energy density is critical for future decarbonization of transportation. Anode-free Li-ion batteries, using a bare current collector at the anode side without any excess of Li, provide the highest volumetric energy density (>1500 Wh L-1) among all possible cell configurations. Furthermore, elimination of the anode material coating reduces material consumption and greatly simplifies cell production, which in turn lowers costs. Although significant progress has been made recently by the application of modified current collectors, optimized cycling parameters and improved liquid electrolytes, insufficient efficiencies, and dendritic growth during lithium plating lead to poor cycle life of typically less than 100 cycles as well as safety issues. Alternatively, very recent studies have demonstrated anode-free solid-state batteries that combine the benefits of high energy anode-free cell configuration and solid-state systems with high safety, exceeding 1000 cycles. This review provides an overview of recent developments toward anode-free solid-state batteries and highlights the current issues and challenges in this nascent field. It is concluded that, although major challenges remain at the present, the lessons learned in the fields of liquid electrolytes and solid-state lithium metal batteries can accelerate the development of anode-free solid-state batteries of practical relevance.
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