Li metal anodes,with high theoretical capacity(3860 mAh g^(-1))and low redox potential,are promising for high-capacity rechargeable batteries.Especially,ultra-thin Li metal anodes can improve energy density and minimi...Li metal anodes,with high theoretical capacity(3860 mAh g^(-1))and low redox potential,are promising for high-capacity rechargeable batteries.Especially,ultra-thin Li metal anodes can improve energy density and minimize lithium excess.However,their poor processability leads to non-uniform Li layers and unstable plating/stripping behavior.In this study,we present a current collector interphase(CCI)-based strategy using a Cu foil coated with a lithiophilic Si3N4 layer,followed by molten Li dip-coating to form around 20 lm Li layer.Furthermore,the scalable dip-coating method,compatibility with large-area current collectors(up to 100 cm^(2)),and stable cycling in pouch cells demonstrate the practical viability of the proposed SNLMA design for commercial lithium metal batteries.During the process,an in-situ Li–Si–N alloy gradient interphase forms at the interface,enhancing wettability and mechanical integrity.This unique gradient CCI provides synergistic lithiophilicity and structural stability,enabling high-performance Li metal batteries.The resulting LixSiy and LixNy phases reduce nucleation barriers and enable uniform Li deposition.As a result,the Si3N4–Li anode paired with a high-loading LCO cathode(22 mg cm^(-2))achieved 83%capacity retention after 100 cycles.This work offers a scalable and practical CCI design for next-generation Li metal batteries.展开更多
基金supported by the Nano&Material Technology Development Program through the National Research Foundation of Korea(NRF)funded by Ministry of Science and ICT(RS-2024-00405905)This research was supported by BrainLink program funded by the Ministry of Science and ICT through the National Research Foundation of Korea(RS-2023-00236798)Following are results of a study on the“Busan Regional Innovation System&Education(RISE)”Project,supported by the Ministry of Education and Busan Metropolitan City。
文摘Li metal anodes,with high theoretical capacity(3860 mAh g^(-1))and low redox potential,are promising for high-capacity rechargeable batteries.Especially,ultra-thin Li metal anodes can improve energy density and minimize lithium excess.However,their poor processability leads to non-uniform Li layers and unstable plating/stripping behavior.In this study,we present a current collector interphase(CCI)-based strategy using a Cu foil coated with a lithiophilic Si3N4 layer,followed by molten Li dip-coating to form around 20 lm Li layer.Furthermore,the scalable dip-coating method,compatibility with large-area current collectors(up to 100 cm^(2)),and stable cycling in pouch cells demonstrate the practical viability of the proposed SNLMA design for commercial lithium metal batteries.During the process,an in-situ Li–Si–N alloy gradient interphase forms at the interface,enhancing wettability and mechanical integrity.This unique gradient CCI provides synergistic lithiophilicity and structural stability,enabling high-performance Li metal batteries.The resulting LixSiy and LixNy phases reduce nucleation barriers and enable uniform Li deposition.As a result,the Si3N4–Li anode paired with a high-loading LCO cathode(22 mg cm^(-2))achieved 83%capacity retention after 100 cycles.This work offers a scalable and practical CCI design for next-generation Li metal batteries.
