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首页> 外文期刊>Advanced Functional Materials >Rational Design of Multifunctional Integrated Host Configuration with Lithiophilicity-Sulfiphilicity toward High-Performance Li-S Full Batteries
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Rational Design of Multifunctional Integrated Host Configuration with Lithiophilicity-Sulfiphilicity toward High-Performance Li-S Full Batteries

机译：具有锂电池 - 硫硅对高性能LI-S全电池的多功能集成宿主配置的理性设计

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摘要

High-energy-density Li-S batteries are considered one of the next-generation energy storage systems, but the uncontrolled Li-dendrite growth in Li metal anodes and the shuttling of polysulfides in S cathode severely impede the commercial development of Li-S batteries. Herein, a conductive composite architecture that is made up of bio-derived N-doped porous carbon fiber bundles (N-PCFs) with co-imbedded cobalt and niobium carbide nanoparticles is employed as a multifunctional integrated host for simultaneously addressing the challenges in both Li anodes and S cathodes. The implantation of Co and NbC nanoparticles bestows the N-PCFs matrix with synergistically enhanced degree of graphitization, electrical conductivity, hierarchical porosity, and surface polarization. Theoretical calculations and experimental results show that NbC with specific lithiophilic and sulfiphilic features can synchronously regulate the Li and S electrochemistry by realizing homogeneous lithium deposition with suppressed Li-dendrite growth and exerting catalytic effects for promoting the polysulfide conversion together with fast Li2S nucleation. Hence, the assembled Li-S full batteries exhibit a superb rate capability (704 mAh g(-1)at 5 C) and cycling life (approximate to 82.3% capacity retention after 500 cycles) at a sulfur loading over 3.0 mg cm(-2), as well as high reversible areal capacity (6.0 mAh cm(-2)) even at a higher sulfur loading of 6.7 mg cm(-2).
机译：高能密度Li-S电池被认为是下一代能量存储系统之一，但Li金属阳极的不受控制的Li-dendrite生长和S阴极的多硫化物的穿梭严重阻碍了Li-S电池的商业发展。在此，由生物衍生的N掺杂多孔碳纤维束（N-PCF）与共嵌入的钴和碳化铌纳米粒子组成的导电复合架构用作多功能集成主体，以便同时解决李中两种挑战阳极和阴极。 CO和NBC纳米颗粒的植入利用协同增强的石墨化，导电性，分层孔隙度和表面偏振具有协同增强的N-PCFS基质。理论计算和实验结果表明，具有特异性锂磷酸和硫硅酸的NBC可以通过实现均匀锂沉积和施加催化效应来同步调节Li和S电化学，并施加催化效应，以促进多硫化物转化率快速Li 2 S成核。因此，组装的LI-S全电池在5℃下载入3.0mg cm（ - 404mAhg）和5℃时，在5℃下的704mAhg（-1））和循环寿命（500次循环后的82.3％的容量保留）（ - 2），以及高可逆的面积容量（> 6.0mahcm（-2）），即使在6.7mg cm（-2）的较高硫负载下。

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