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Rambutan‐Inspired Yolk‐Shell Silica@Carbon Frameworks from Biomass for Long‐Life Anode Materials
ChemistrySelect ( IF 1.9 ) Pub Date : 2019-12-20 , DOI: 10.1002/slct.201904302 Huarui Ding 1 , Guang Wang 1 , Ying Qi 1 , Jian Bao 1 , Jiabiao Lian 1 , Jingxia Qiu 1 , Sheng Li 2 , Shouqi Yuan 1 , Huaming Li 1
ChemistrySelect ( IF 1.9 ) Pub Date : 2019-12-20 , DOI: 10.1002/slct.201904302 Huarui Ding 1 , Guang Wang 1 , Ying Qi 1 , Jian Bao 1 , Jiabiao Lian 1 , Jingxia Qiu 1 , Sheng Li 2 , Shouqi Yuan 1 , Huaming Li 1
Affiliation
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SiO2 is regarded as one of the most promising anode materials for Li‐ion batteries due to its high capacity, low cost and other merits. However, the poor conductivity and the volume change are still hindering its practical applications. In this work, a rambutan‐inspired structure is designed to fabricate amorphous SiO2@N, P co‐doped porous carbon frameworks from biomass. The carbon shell could connect with each other, providing good conductivity. After partially etching of the SiO2, the yolk‐shell structure could buffer the volume changes of SiO2 during the charge/discharge processes without destroying the conducting shell. Besides, N, P doping and graphite nano crystallites in the frameworks could also offer more active sites for Li+ storage. As a result, the composite can not only exhibit excellent rate performance nearly 300 mAh g−1 at a current density of 2000 mA g−1, but also deliver a surprisingly stable reversible capacity of 373 mAh g−1 over 1000 cycles at the current density of 500 mA g−1 with the Coulombic efficiency beyond 99%. Considering the facile preparation and satisfactory lithium storage abilities, this composite design could be able to extend for practical battery application.
中文翻译：
来自生物质的红毛丹启发的蛋黄壳二氧化硅@碳骨架，用于长寿命阳极材料
SiO 2具有高容量，低成本和其他优点，被认为是锂离子电池最有希望的负极材料之一。然而，差的电导率和体积变化仍然阻碍了其实际应用。在这项工作中，设计了一种以红毛丹为灵感的结构，以利用生物质来制造无定形SiO 2 @N，P共掺杂的多孔碳骨架。碳壳可以相互连接，从而提供良好的导电性。在部分蚀刻SiO 2之后，卵黄壳结构可以在充电/放电过程中缓冲SiO 2的体积变化，而不会破坏导电壳。此外，框架中的氮，磷掺杂和石墨纳米微晶也可以为锂提供更多的活性位点。+储存空间。结果，该复合物不仅可以在2000 mA g -1的电流密度下表现出近300 mAh g -1的优异速率性能，而且在电流1000次循环下还具有惊人的稳定的373 mAh g -1的可逆容量。密度为500 mA g -1，库仑效率超过99％。考虑到制备简便和令人满意的锂存储能力，这种复合设计可以扩展到实际的电池应用中。
更新日期：2019-12-20
中文翻译：
来自生物质的红毛丹启发的蛋黄壳二氧化硅@碳骨架，用于长寿命阳极材料
SiO 2具有高容量，低成本和其他优点，被认为是锂离子电池最有希望的负极材料之一。然而，差的电导率和体积变化仍然阻碍了其实际应用。在这项工作中，设计了一种以红毛丹为灵感的结构，以利用生物质来制造无定形SiO 2 @N，P共掺杂的多孔碳骨架。碳壳可以相互连接，从而提供良好的导电性。在部分蚀刻SiO 2之后，卵黄壳结构可以在充电/放电过程中缓冲SiO 2的体积变化，而不会破坏导电壳。此外，框架中的氮，磷掺杂和石墨纳米微晶也可以为锂提供更多的活性位点。+储存空间。结果，该复合物不仅可以在2000 mA g -1的电流密度下表现出近300 mAh g -1的优异速率性能，而且在电流1000次循环下还具有惊人的稳定的373 mAh g -1的可逆容量。密度为500 mA g -1，库仑效率超过99％。考虑到制备简便和令人满意的锂存储能力，这种复合设计可以扩展到实际的电池应用中。
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