Jiaqi Zhu,Dan Cai,Jingru Li,Xiuli Wang,Xinhui Xia,Changdong Gu,Jiangping Tu
Optimization of lithium metal anode is a pivotal part in facilitating the evolution of next-generation high energy density solid-state lithium metal batteries (LMBs). However, the practical application of lithium anode in solid-state LMBs is limited by uncontrollable dendrite growth and the poor interfacial contact with solid electrolyte. Herein, a 40 µm thin lithium composite anode based on the AlN-embedded reduced graphene oxide (rGO) scaffold synthesized via one-step molten lithium infusion is proposed. The resulting lithiophilic Li-Al alloy and high ion-conductive Li 3 N in situ constructed the lithium ion diffusing highways inside electrode, enabling a well-oriented Li deposition and effectively inhibiting the dendrite growth. Combined with in-situ polymerization and Li 3 N-modified solid electrolyte interphase (SEI), the composite anodes can prolong the lifespan of symmetric cell to 2100 h at 0.2 mA cm −2 /0.2 mAh cm −2 in carbonate-based solid polymer electrolytes. Moreover, LAG||LiFePO 4 full cells also excelled in cycling capability and rate performance. This modified electrode offers a promising synergistic solution for designing high-performance solid-state LMBs.
Pengfei Ren,Nicholas S. Grundish,Sidong Zhang,Lihai Zhou,Ruiping Liu,Nan Wu,Yutao Li
The stability of the lithium-metal/solid electrolyte interface remains a critical challenge in the development of all-solid-state lithium-metal batteries (ASSLMBs), as it directly influences their cycling performance, rate capability, and safety. Here, a thin, flexible, and lithium-stable sulfide electrolyte membrane is presented with high ionic conductivity (3.25 × 10 −3 S cm −1 ) and low electronic conductivity (1.45 × 10 −9 S cm −1 ) at room temperature, prepared with an AlCl 3 coating in a low-cost wet process. The in situ formation of a lithiophilic Li-Al alloy and a lithiophobic LiCl layer at the interface creates a stable dual-layer structure, effectively suppressing Li-dendrite growth and enhancing Li-transport across the interface. Symmetric Li/Li cells with this coated membrane exhibit exceptional cycling stability, operating for over 10000 h at 0.5 mA cm −2 . ASSLMBs assembled with a LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode and a metallic lithium anode exhibit excellent cycling performance, highlighting the potential of this coating strategy to stabilize the Li/solid electrolyte interface and expedite the commercialization of ASSLBs.
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