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首页> 外文期刊>Advanced Materials >A 3D Lithiophilic Mo_2N-Modified Carbon Nanofiber Architecture for Dendrite-Free Lithium-Metal Anodes in a Full Cell
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A 3D Lithiophilic Mo_2N-Modified Carbon Nanofiber Architecture for Dendrite-Free Lithium-Metal Anodes in a Full Cell

机译：3D Lithiophilic Mo_2N修饰的碳纳米纤维体系结构的全电池中无树突状锂金属阳极。

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摘要

The pursuit for high-energy-density batteries has inspired the resurgence of metallic lithium (Li) as a promising anode, yet its practical viability is restricted by the uncontrollable Li dendrite growth and huge volume changes during repeated cycling. Herein, a new 3D framework configured with Mo2N-mofidied carbon nanofiber (CNF) architecture is established as a Li host via a facile fabrication method. The lithiophilic Mo2N acts as a homogeneously pre-planted seed with ultralow Li nucleation overpotential, thus spatially guiding a uniform Li nucleation and deposition in the matrix. The conductive CNF skeleton effectively homogenizes the current distribution and Li-ion flux, further suppressing Li-dendrite formation. As a result, the 3D hybrid Mo2N@CNF structure facilitates a dendrite-free morphology with greatly alleviated volume expansion, delivering a significantly improved Coulombic efficiency of approximate to 99.2% over 150 cycles at 4 mA cm(-2). Symmetric cells with Mo2N@CNF substrates stably operate over 1500 h at 6 mA cm(-2) for 6 mA h cm(-2). Furthermore, full cells paired with LiNi0.8Co0.1Mn0.1O2 (NMC811) cathodes in conventional carbonate electrolytes achieve a remarkable capacity retention of 90% over 150 cycles. This work sheds new light on the facile design of 3D lithiophilic hosts for dendrite-free lithium-metal anodes.
机译：对高能量密度电池的追求激发了金属锂（Li）作为有前途的负极的兴起，但其实际生存能力受到不可控制的Li树枝状晶体生长和重复循环期间巨大的体积变化的限制。在此，通过简便的制造方法将配置有Mo2N的碳纳米纤维（CNF）结构的新3D框架建立为Li主机。亲硫的Mo2N用作均质的预先植入种子，具有超低的Li成核超电势，因此在空间上引导均匀的Li成核和在基质中沉积。导电CNF骨架可有效地均匀化电流分布和锂离子通量，从而进一步抑制锂枝晶的形成。结果，3D杂化Mo2N @ CNF结构促进了无枝晶形态的发生，体积膨胀大大减轻，在4 mA cm（-2）的150个循环中，库仑效率显着提高了约99.2％。具有Mo2N @ CNF基板的对称单元在1500 h内以6 mA cm（-2）稳定运行6 mA h cm（-2）。此外，在常规碳酸盐电解质中，与LiNi0.8Co0.1Mn0.1O2（NMC811）阴极配对的全电池在150个循环中可实现90％的显着容量保持率。这项工作为无树突状锂金属阳极的3D亲硫主体的简便设计提供了新的思路。

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