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Fast-Charging of Hybrid Lithium-Ion/Lithium-Metal Anodes by Nanostructured Hard Carbon Host
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-11-14 , DOI: 10.1021/acsenergylett.2c02130
Huaxin Gong 1 , Yuelang Chen 1, 2 , Shucheng Chen 1 , Chengyi Xu 1 , Yufei Yang 3 , Yusheng Ye 3 , Zhuojun Huang 3 , Rui Ning 3 , Yi Cui 3, 4, 5 , Zhenan Bao 1
Affiliation  

Lithium metal could provide ∼10 times the theoretical specific capacity compared to graphite. However, despite recent progress in improving the Coulombic efficiency (CE), metallic lithium still suffers from poor cyclic stability at high current densities, which limits applications of lithium-metal anodes in high-power scenarios. Here we report stable cycling of metallic lithium under high current densities and realistic cell conditions based on a flower-like nanostructured hard carbon host (CF). CF was both intercalated with lithium ions and plated with lithium metal to render a hybrid lithium-ion/lithium-metal anode capacity. The hybrid cells showed >99% CE up to 12 mA/cm2 (4 mAh/cm2) with commercial carbonate electrolyte. The stability of the hybrid anodes was attributed to the uniform lithium plating morphology and fast ion diffusion pathways enabled by the open-pore nanostructures of CF. Moreover, the CF||NMC811 hybrid cells (2 mAh/cm2) showed ∼70% capacity retention after 200 cycles at 10 mA/cm2 current densities, while demonstrating >2 times anode specific capacity and much better high-rate stability compared to graphite||NMC lithium-ion cells.

中文翻译:

纳米结构硬碳主体对混合锂离子/锂金属阳极的快速充电

与石墨相比,锂金属可以提供约 10 倍的理论比容量。然而,尽管最近在提高库仑效率(CE)方面取得了进展,但金属锂在高电流密度下的循环稳定性仍然较差,这限制了锂金属负极在大功率场景中的应用。在这里,我们报告了金属锂在高电流密度和基于花状纳米结构硬碳主体 (CF) 的真实电池条件下的稳定循环。CF既嵌入锂离子又镀锂金属以提供混合锂离子/锂金属阳极容量。混合电池在高达 12 mA/cm 2 (4 mAh/cm 2) 与商业碳酸盐电解液。混合阳极的稳定性归因于均匀的锂电镀形态和由 CF 的开孔纳米结构实现的快速离子扩散路径。此外,CF||NMC811 混合电池 (2 mAh/cm 2 ) 在 10 mA/cm 2电流密度下循环 200 次后显示出约 70% 的容量保持率,同时表现出 >2 倍的阳极比容量和更好的高倍率稳定性到石墨||NMC 锂离子电池。
更新日期:2022-11-14
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