Advanced anode for sodium-ion battery with promising long cycling stability achieved by tuning phosphorus-carbon nanostructures
Advanced anode for sodium-ion battery with promising long cycling stability achieved by tuning phosphorus-carbon nanostructures
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通过调整磷碳纳米结构实现钠离子电池的先进阳极，具有良好的长循环稳定性
DOI：
10.1016/j.nanoen.2017.08.019
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发表时间：
2017-10
期刊：
影响因子：
17.6
通讯作者：
Donghai Wang
中科院分区：
文献类型：
--
作者：
Zhaoxin Yu;Jiangxuan Song;Daiwei Wang;Donghai Wang
磷具有2595 mAh g−1的理论容量，是一种很有前途的钠离子电池负极材料。本研究制备了两种磷碳（P-C）复合材料，它们的组成和纳米结构都得到了很好的控制：将P约束在YP-80F碳多孔结构中的复合材料P@YP和将无约束P沉积在碳纳米管表面的复合材料P@CNT。研究了这两种复合材料的结构和电化学性能，以说明C和P的纳米结构对P@YP复合材料的影响，适量的P被限制在纳米孔中，可以适应其在钠化/脱钠时的大体积变化，并实现稳定的固-电解质界面（SEI），确保了优异的长期循环稳定性，100次循环后的容量保持率为92%，1000次循环后的容量保持率为46%。相比之下，具有无约束P纳米结构的P@CNT复合材料在100次循环后容量衰减迅速，容量保留率约为40.6%，这很可能是由于P@CNT复合材料中无约束P的大体积变化导致循环过程中SEI不稳定所致。设计良好的纳米结构P- c复合材料，将P限制在碳的多孔结构中，大大提高了电化学性能，具有良好的长期循环稳定性。
Phosphorus is considered as a promising anode for Na-ion battery because of its high theoretical capacity of 2595 mAh g−1. In this study, two phosphorus-carbon (P-C) composites with well-controlled compositions and nanostructures of P and C have been developed: P@YP composite with P confined within porous structure of YP-80F carbon and P@CNT with unconfined P deposited on the surface of carbon nanotube. The structure and electrochemical performance of these two composites have been studied to illustrate the effect of nanostructures of both C and P. P@YP composite with appropriate amount of P confined in nanopores can accommodate its large volume change upon sodiation/desodiation and enable a stable solid-electrolyte interphase (SEI), ensuring an excellent long-term cycling stability with superior capacity retention of 92% after 100 cycles and 46% after 1000 cycles. In contrast, the P@CNT composite with unconfined P nanostructures shows a rapid capacity decay with capacity retention of ~ 40.6% after 100 cycles, most likely due to unstable SEI during cycling, caused by the large volume changes of unconfined P in the P@CNT composite. The well-designed nanostructured P-C composite with P confined within porous structure of carbon is demonstrated to greatly enhance the electrochemical performance, leading to promising long-term cycling stability.
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影响因子：
17.1
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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