材料科学
阳极
金属
碳纤维
钠
吸附
化学工程
离子
衍射
纳米技术
电极
冶金
复合材料
物理化学
有机化学
物理
化学
光学
复合数
工程类
作者
Xi Liu,Minglu Zhang,Sheng Wang,Peng Yi,Liu Yang,Shafi Ullah,Zhihua Duan,Wanjie Gao,Bingyan Song,Mingxuan Wei,Jiarui He,Zhenghui Li,Yuping Wu
标识
DOI:10.1002/adma.202410673
摘要
Abstract Carbonaceous materials have been considered the most promising anode in sodium‐ion batteries (SIBs) due to their low cost, good electrical conductivity, and structural stability. The main challenge of carbonaceous anodes prior to their commercialization is low initial coulomb efficiencies, derived from a lack of an efficient technique to reveal a fundamental comprehension of sodium storage mechanisms. Here, the direct observation of quasi‐Na metallic clusters in carbonaceous anodes during cycling through in situ XRD is reported. By means of such a technique, a strong self‐adsorption behavior forming quasi‐Na metallic clusters is detected within a rationally designed highly defective ultrathin carbon nanosheets (HDCS) anode. Such a self‐adsorption and crystalline system transformation mechanism in HDCS brings capacity retention about 100% after 1000 cycles at 1 A g −1 . This work provides a new principle for designing high‐performance carbon anodes for SIBs.
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