![]()
卤氧化铋（BiOCl）因具有较高的理论比容量和独特的层状结构，是一种有潜力的高性能钠离子电池（SIBs）负极材料。然而，其面临储钠过程中体积膨胀大、储钠机制不明和材料合成方法复杂等诸多挑战，严重制约了其实际应用。
近日，厦门大学张桥保教授等人在Science China Materials发表研究论文，提出了一种简便高效的合成策略成功构筑了高性能储钠BiOCl纳米片负极材料。
本文要点
1) 通过深入的原位/非原位显微和谱学表征技术结合电化学分析，证实了BiOCl纳米片负极在嵌/脱钠循环后，生成了金属Bi和Na3OCl。所形成的金属Bi在后续的循环过程中作为储钠的活性物质，而形成的Na3OCl有利于增强固体电解质中间相（SEI）的稳定性和促进钠离子的快速传输。此外，形成的金属Bi在循环过程中逐渐转变为纳米多孔结构，进一步提高钠离子的传输效率和缓冲材料的体积膨胀。2) 制备得到的BiOCl纳米片负极展现出了优异的倍率性能和循环稳定性。由预钠循环后的BiOCl纳米片负极与磷酸钒钠（NVP）正极匹配组装的全电池，也表现出了优异的倍率和循环性能。这项工作为开发高性能的钠离子电池负极提供了有价值的见解。本文将收录于“2025 Emerging Investigator Issue”。Figure 1. Preparation and characterizations of BiOCl nanosheets. (a) Schematic diagram of the BiOCl nanosheets synthesis process. (b) XRD pattern, (c) SEM image, (d) TEM image, (e) SAED pattern, (f, g) HRTEM images, (h) atomic spacing profile, (i) high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) image and element mapping images of BiOCl nanosheets.Figure 2. Sodium-ion storage performance of BiOCl nanosheets anode. (a) CV curves at 0.2 mV s−1. (b) GCD curves at 0.1 A g−1. (c) Cycling performance at 0.1 A g−1. (d) Rate performances at different current densities. (e) Rate performance comparison with recently reported Bi-based anodes. (f) Long-term cycling performance at 10 A g−1. (g) Cycling performance comparison with other Bi-based anodes. (h) Cyclic performance under different mass loadings.Figure 3. In-situ TEM characterization for the sodiation process in BiOCl nanosheets anode. (a) In-situ TEM and (b) SAED patterns of BiOCl nanosheets during the initial sodiation. (c) Radial distribution profile and (d) contour plot of the in-situ SAED data.Figure 4. Performance of the NVP//pre-cycled BiOCl nanosheets full cells. (a) Schematic diagram of the NVP//pre-cycled BiOCl nanosheets full cell. (b) GCD curves of the NVP cathode, the pre-cycled BiOCl nanosheets anode and the NVP//pre-cycled BiOCl nanosheets full cell. (c) GCD curves of the NVP//pre-cycled BiOCl nanosheets full cell at various current densities. (d) Rate performance of the NVP//pre-cycled BiOCl nanosheets full cell. (e) Rate performance comparison between the assembled full cell with recently reported full cells. (f) GCD curves and (g) cycling performance of the full cell at 1 A g−1. (h) Comparison of cycling performance of assembled full cell and recently reported full cells.Shenghui Zhou, Zhefei Sun, Zilong Zhuang, Sifan Wen, Haoyu Chen, Quanzhi Yin, Jianhai Pan, Xingqi Chen, Jijian Xu, Qiaobao Zhang. Facile and scalable synthesis of bismuth oxyhalide nanosheets anodes for fast and durable sodium-ion storage. Sci. China Mater. (2024).https://doi.org/10.1007/s40843-024-3175-3
![]()
点击左下角“阅读原文”，阅读以上文章PDF原文
![]()
