阳极
碳纤维
热解
阴极
材料科学
钠
化学工程
储能
化学
纳米技术
电极
冶金
复合材料
工程类
量子力学
物理化学
物理
功率(物理)
复合数
作者
Jing Wang,Lei Yan,Binhua Liu,Qingjuan Ren,Linlin Fan,Zhiqiang Shi,Qingyin Zhang
标识
DOI:10.1016/j.cclet.2022.05.040
摘要
Due to its low cost and easy availability, the pitch is considered a promising precursor for soft carbon anodes. However, pitch-derived soft carbon shows a high graphitization degree and small interlayer spacing, resulting in its much lower sodium storage performance than hard carbon. We propose a novel pre-oxidation strategy to introduce additional oxygen atoms into the low-cost soft carbon precursor pitch to fabricate a defect-rich and large-interlayer spacing hard carbon anode (HPP-1100). Compared with the direct pyrolysis of pitch carbon, the sodium storage capacity of HPP-1100 is significantly improved from 120.3 mAh/g to 306.7 mAh/g, with an excellent rate and cycling capability (116.5 mAh/g at 10 C). Moreover, when assorted with an O3-Na(NiFeMn)1/3O2 cathode, the full cell delivers a high reversible capacity of 274.0 mAh/g at 0.1 C with superb cycle life. This work provides a new solution for realizing the application of low-cost pitch anodes in Na-ion batteries.
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