Jin Ren, Shuhao Zhang, Min Niu, Yueyao Dong, Lu Liang, Shengtao Zhang, Li Li Zhao, Liwei Dong*, Chunhui Yang and Jia-Yan Liang*,
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引用次数: 0
Abstract
Anode-free lithium metal batteries (AFLMBs) offer high energy density and enhanced safety due to no excess lithium (Li) in the anode. Nevertheless, Li dendrite growth and dead Li formation rapidly consume the limited active Li in AFLMBs, resulting in a low Coulombic efficiency (CE) and accelerated battery capacity deterioration. Herein, a Li reservoir is established by incorporating lithium formate (CHLiO2) into both the cathode and anode as a Li salt additive for interface reconstruction, which improves the cycling stability of AFLMBs. Density functional theory calculation confirms that CHLiO2 exhibits relatively lower lowest unoccupied molecule orbital (LUMO) energies and higher highest occupied molecular orbital (HOMO) energies compared to the carbonate electrolyte solvents. The integration of CHLiO2 significantly promotes the reconstruction of LiF-rich interfaces and effectively prevents continuous electrolyte decomposition, which contributes to uniform Li deposition and suppresses active Li consumption. After the introduction of the CHLiO2 additive, the Cu||NCM811 cell retains an average CE of 97.3% during 40 cycles. This study provides a simple yet effective methodology to supply an extra Li source and reconstruct LiF-rich interfaces for extending the cycling life of AFLMBs.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.