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Long‐Life Lithium–Sulfur Batteries with a Bifunctional Cathode Substrate Configured with Boron Carbide Nanowires
Advanced Materials ( IF 27.4 ) Pub Date : 2018-08-12 , DOI: 10.1002/adma.201804149
Liu Luo 1 , Sheng-Heng Chung 1 , Hooman Yaghoobnejad Asl 1 , Arumugam Manthiram 1
Advanced Materials ( IF 27.4 ) Pub Date : 2018-08-12 , DOI: 10.1002/adma.201804149
Liu Luo 1 , Sheng-Heng Chung 1 , Hooman Yaghoobnejad Asl 1 , Arumugam Manthiram 1
Affiliation
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Developing high‐energy‐density lithium–sulfur (Li–S) batteries relies on the design of electrode substrates that can host a high sulfur loading and still attain high electrochemical utilization. Herein, a new bifunctional cathode substrate configured with boron‐carbide nanowires in situ grown on carbon nanofibers (B4C@CNF) is established through a facile catalyst‐assisted process. The B4C nanowires acting as chemical‐anchoring centers provide strong polysulfide adsorptivity, as validated by experimental data and first‐principle calculations. Meanwhile, the catalytic effect of B4C also accelerates the redox kinetics of polysulfide conversion, contributing to enhanced rate capability. As a result, a remarkable capacity retention of 80% after 500 cycles as well as stable cyclability at 4C rate is accomplished with the cells employing B4C@CNF as a cathode substrate for sulfur. Moreover, the B4C@CNF substrate enables the cathode to achieve both high sulfur content (70 wt%) and sulfur loading (10.3 mg cm−2), delivering a superb areal capacity of 9 mAh cm−2. Additionally, Li–S pouch cells fabricated with the B4C@CNF substrate are able to host a high sulfur mass of 200 mg per cathode and deliver a high discharge capacity of 125 mAh after 50 cycles.
中文翻译:
长寿命锂-硫电池,具有配置有碳化硼纳米线的双功能阴极基材
开发高能量密度锂硫(Li–S)电池依赖于电极基底的设计,该基底可承受高硫负荷并仍能达到较高的电化学利用率。在此,通过一种简便的催化剂辅助工艺,建立了一种新的双功能阴极基材,该基材配置有在碳纳米纤维(B 4 C @ CNF)上原位生长的碳化硼纳米线。经实验数据和第一性原理计算验证,充当化学固定中心的B 4 C纳米线提供了强大的多硫化物吸附能力。同时,B 4的催化作用C还加速了多硫化物转化的氧化还原动力学,从而有助于提高速率能力。结果,使用B 4 C @ CNF作为硫的阴极底物的电池,在500次循环后具有80%的显着容量保持率以及4C速率下的稳定循环性。此外,B 4 C @ CNF衬底使阴极能够实现高硫含量(70 wt%)和硫负载量(10.3 mg cm -2),从而提供了9 mAh cm -2的极高面积容量。此外,用B 4 C @ CNF基板制造的Li–S袋式电池能够承载每个阴极200 mg的高硫量,并在50个循环后提供125 mAh的高放电容量。
更新日期:2018-08-12
中文翻译:
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长寿命锂-硫电池,具有配置有碳化硼纳米线的双功能阴极基材
开发高能量密度锂硫(Li–S)电池依赖于电极基底的设计,该基底可承受高硫负荷并仍能达到较高的电化学利用率。在此,通过一种简便的催化剂辅助工艺,建立了一种新的双功能阴极基材,该基材配置有在碳纳米纤维(B 4 C @ CNF)上原位生长的碳化硼纳米线。经实验数据和第一性原理计算验证,充当化学固定中心的B 4 C纳米线提供了强大的多硫化物吸附能力。同时,B 4的催化作用C还加速了多硫化物转化的氧化还原动力学,从而有助于提高速率能力。结果,使用B 4 C @ CNF作为硫的阴极底物的电池,在500次循环后具有80%的显着容量保持率以及4C速率下的稳定循环性。此外,B 4 C @ CNF衬底使阴极能够实现高硫含量(70 wt%)和硫负载量(10.3 mg cm -2),从而提供了9 mAh cm -2的极高面积容量。此外,用B 4 C @ CNF基板制造的Li–S袋式电池能够承载每个阴极200 mg的高硫量,并在50个循环后提供125 mAh的高放电容量。