阳极
碳化
材料科学
锂(药物)
磷
碳纤维
杂原子
比表面积
吸附
离子
化学工程
纳米技术
无机化学
复合材料
电极
化学
复合数
催化作用
有机化学
扫描电子显微镜
工程类
冶金
医学
物理化学
内分泌学
戒指(化学)
作者
Hui Guo,Saidan Zhao,Baolin Xing,Zhenshuai Wang,Huihui Zeng,Xiaoxiao Qu,Song Cheng,Feng Shi,Yaowen Xing,Jingfeng He,Chuanxiang Zhang
标识
DOI:10.1016/j.est.2024.111005
摘要
Heteroatom-doped porous carbon nanosheets have rapidly emerged as viable anode materials for lithium-ion batteries due to their high specific surface area, excellent electrical conductivity, and abundant active sites. Herein, phosphorus-doped carbon nanosheets (P-CNS) are synthesized via a space-confined carbonization strategy using phytic acid as carbon and phosphorus source and expanded vermiculite as a template. The obtained P-CNS have a unique sheet-like structure with a large surface area (∼746 m2/g), abundant hierarchical pore structure (the total pore volume of 0.609 cm3/g), and phosphorus atoms (the corresponding content of 2.25 %), which exists as P−O and P−C. P-CNS anode for lithium-ion batteries exhibits an excellent reversible capacity (1704 mAh/g at 0.05 A/g) and extraordinary cycling performance (capacity retention of 89.4 % at 5 A/g after 1000 cycles). The huge surface area and rich pore structure, which can provide transport paths and storage sites for lithium ions, are responsible for the exceptional performance. Furthermore, the phosphorus atoms not only introduce defects in P-CNS, but P−O and P−C can also increase the adsorption of lithium ions. This work provides a promising method to synthesize high-performance phosphorus-doped carbon nanosheets anode for lithium-ion batteries.
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