Cao Daxian, Ji Tongtai, Wei Zhengxuan, Liang Wentao, Bai Ruobing, Burch Kenneth S, Geiwitz Michael, Zhu Hongli
Department of Mechanical and Industrial Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, United States.
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States.
Nano Lett. 2023 Oct 25;23(20):9392-9398. doi: 10.1021/acs.nanolett.3c02713. Epub 2023 Oct 11.
Anode-free all-solid-state lithium metal batteries (ASLMBs) promise high energy density and safety but suffer from a low initial Coulombic efficiency and rapid capacity decay, especially at high cathode loadings. Using operando techniques, we concluded these issues were related to interfacial contact loss during lithium stripping. To address this, we introduce a conductive carbon felt elastic layer that self-adjusts the pressure at the anode side, ensuring consistent lithium-solid electrolyte contact. This layer simultaneously provides electronic conduction and releases the plating pressure. Consequently, the first Coulombic efficiency dramatically increases from 58.4% to 83.7% along with a >10-fold improvement in cycling stability. Overall, this study reveals an approach for enhancing anode-free ASLMB performance and longevity by mitigating lithium stripping inefficiency through self-adjusting interfacial pressure enabled by a conductive elastic interlayer.
无阳极全固态锂金属电池（ASLMBs）有望实现高能量密度和安全性，但存在初始库仑效率低和容量快速衰减的问题，尤其是在高阴极负载情况下。通过使用原位技术，我们得出这些问题与锂剥离过程中的界面接触损失有关。为了解决这个问题，我们引入了一种导电碳毡弹性层，该层可自动调节阳极侧的压力，确保锂与固体电解质之间保持一致的接触。该层同时提供电子传导并释放镀覆压力。因此，首次库仑效率从58.4%大幅提高到83.7%，循环稳定性提高了10倍以上。总体而言，本研究揭示了一种通过由导电弹性中间层实现的自调节界面压力来减轻锂剥离效率低下的问题，从而提高无阳极ASLMB性能和寿命的方法。
