Cao Jiaqi, Shi Yuansheng, Gao Aosong, Du Guangyuan, Dilxat Muhtar, Zhang Yongfei, Cai Mohang, Qian Guoyu, Lu Xueyi, Xie Fangyan, Sun Yang, Lu Xia
School of Materials, Sun Yat-sen University, Shenzhen, 518107, PR China.
Instrumental Analysis & Research Center, Sun Yat-sen University, Guangzhou, 510275, PR China.
Nat Commun. 2024 Feb 14;15(1):1354. doi: 10.1038/s41467-024-45613-4.
Exploiting thin Li metal anode is essential for high-energy-density battery, but is severely plagued by the poor processability of Li, as well as the uncontrollable Li plating/stripping behaviors and Li/electrolyte interface. Herein, a thickness/capacity-adjustable thin alloy-type Li/LiZn@Cu anode is fabricated for high-energy-density Li metal batteries. The as-formed lithophilic LiZn alloy in Li/LiZn@Cu anode can effectively regulate Li plating/stripping and stabilize the Li/electrolyte interface to deliver the hierarchical Li electrochemistry. Upon charging, the Li/LiZn@Cu anode firstly acts as Li source for homogeneous Li extraction. At the end of charging, the de-alloy of LiZn nanostructures further supplements the Li extraction, actually playing the Li compensation role in battery cycling. While upon discharging, the LiZn alloy forms just at the beginning, thereby regulating the following Li homogeneous deposition. The reversibility of such an interesting process is undoubtedly verified from the electrochemistry and in-situ XRD characterization. This work sheds light on the facile fabrication of practical Li metal anodes and useful Li compensation materials for high-energy-density Li metal batteries.
开发薄锂金属负极对于高能量密度电池至关重要，但锂的加工性能差、锂电镀/剥离行为不可控以及锂/电解质界面问题严重困扰着这一过程。在此，制备了一种厚度/容量可调的薄合金型锂/锂锌@铜负极，用于高能量密度锂金属电池。锂/锂锌@铜负极中形成的亲锂性锂锌合金可以有效调节锂的电镀/剥离，并稳定锂/电解质界面，以实现分级锂电化学。充电时，锂/锂锌@铜负极首先作为锂源进行均匀的锂提取。充电结束时，锂锌纳米结构的去合金化进一步补充锂提取，实际上在电池循环中起到锂补偿作用。而放电时，锂锌合金在开始时形成，从而调节随后的锂均匀沉积。这种有趣过程的可逆性无疑通过电化学和原位XRD表征得到了验证。这项工作为实用锂金属负极的简便制备以及高能量密度锂金属电池的有用锂补偿材料提供了思路。
