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| 1 | High N-doped hierarchical porous carbon networks with expanded interlayers for efficient sodium storage显示文摘Sodium-ion batteries (SIBs) have been attracting considerable attention as a promising candidate for large-scale energy storage because of the abundance and low-cost of sodium resources. However, lack of appropriate anode materials impedes further applications. Herein, a novel self-template strategy is designed to synthesize uniform flowerlike N-doped hierarchical porous carbon networks (NHPCN) with high content of N (15.31 at.%) assembled by ultrathin nanosheets via a self-synthesized single precursor and subsequent thermal annealing. Relying on the synergetic coordination of benzimidazole and 2-methylimidazole with metal ions to produce a flowerlike network, a self-formed single precursor can be harvested. Due to the structural and compositional advantages, including the high N doping, the expanded interlayer spacing, the ultrathin two-dimensional nano-sized subunits, and the three-dimensional porous network structure, these unique NHPCN flowers deliver ultrahigh reversible capacities of 453.7 mAh·g^−1 at 0.1 A·g^−1 and 242.5 mAh·g^−1 at 1 A·g^−1 for 2,500 cycles with exceptional rate capability of 5 A·g^−1 with reversible capacities of 201.2 mAh·g^−1. The greatly improved sodium storage performance of NHPCN confirms the importance of reasonable engineering and synthesis of hierarchical carbon with unique structures. | Dongqin Su Man Huang Junhao Zhang Xingmei Guo Jiale Chen Yanchun Xue Aihua Yuan Qinghong Kong | 2020 | Nano Research2020，13，10： | 5 |
| 2 | 金属硫化物作为锂离子电池负极材料研究进展显示文摘综述了通过多种合成/制备策略得到不同尺寸、不同形貌、不同维度的金属硫化物,以及其与石墨烯/碳纳米管等复合材料,包括层状、三明治、中空核壳状及其混合结构等形式的金属硫化物/碳复合材料。应用于锂离子电池负极时,金属硫化物复合材料表现出优异的电化学性能诸如高的放电容量、良好的倍率特性、循环稳定等。此外,我们进一步展望了金属硫化物复合材料作为电池电极材料的应用和开发前景。 | 闵永刚 陈妙玲 黄兴文 王凌志 廖松义 刘屹东 | 2020 | 功能材料2020，51，12： | 3 |
| 3 | Bimetallic nickel cobalt sulfides with hierarchical coralliform architecture for ultrafast and stable Na-ion storage显示文摘A series of bimetallic nickel cobalt sulfides with hierarchical micro/nano architectures were fabricated via a facile synthesis strategy of bimetallic micro/nano structure precursor construction-anion exchange via solvothermal method. Among the nickel cobalt sulfides with different Ni/Co contents, the coral-like Ni1.01Co1.99S4 (Ni/Co, 1/2) delivers ultrafast and stable Na-ion storage performance (350 mAh·g−1 after 1,000 cycles at 1 A·g−1 and 355 mAh·g−1 at 5 A·g−1). The remarkable electrochemical properties can be attributed to the enhanced conductivity by co-existence of bimetallic components, the unique coral-like micro/nanostructure, which could prevent structural collapse and self-aggregation of nanoparticles, and the easily accessibility of electrolyte, and fast Na+ diffusion upon cycling. Detailed kinetics studies by a galvanostatic intermittent titration technique (GITT) reveal the dynamic change of Na+ diffusion upon cycling, and quantitative kinetic analysis indicates the high contribution of pseudocapacitive behavior during charge-discharge processes. Moreover, the ex-situ characterization analysis results further verify the Na-ion storage mechanism based on conversion reaction. This study is expected to provide a feasible design strategy for the bimetallic sulfides materials toward high performance sodium-ion batteries. | Yanyan He Caifu Dong Sijia He Huan Li Xiuping Sun Yuan Cheng Guowei Zhou Liqiang Xu | 2021 | Nano Research2021，14，11： | 1 |
| 4 | 一维氮掺杂碳包覆Fe_(3)O_(4)和Fe_(7)S_(8)纳米棒复合材料的制备及其储锂、储钠性能研究显示文摘以水热法制备的羟基氧化铁纳米棒作为反应原料,首先采用室温聚合法,在其表面包覆一层均匀的聚多巴胺,获得聚多巴胺包覆的羟基氧化铁,然后通过后续热处理,获得氮掺杂碳包覆的Fe_(3)O_(4)和Fe_(7)S_(8)复合材料(Fe_(3)O_(4)@NC和Fe_(7)S_(8)@NC)。采用XRD、拉曼光谱仪、XPS、SEM以及TEM等技术对上述两种复合材料的结构和形貌进行表征。将上述制备的两种复合材料分别作为负极材料,组装纽扣半电池,测试并研究其储锂、储钠性能。实验结果表明:Fe_(3)O_(4)@NC相比Fe_(7)S_(8)@NC展现出了更高的可逆比容量和更优异的高倍率储锂循环性能,在2 A·g^(-1)的电流密度下,循环300圈,其可逆比容量可分别维持在1083和859 mAh·g^(-1);作为钠离子电池负极材料,Fe_(3)O_(4)@NC相比Fe_(7)S_(8)@NC展现出了更平稳的循环稳定性,而Fe_(7)S_(8)@NC出现容量明显上升的趋势。在1 A·g^(-1)的电流密度下,循环350圈后,二者的电池容量分别为100和259 mAh·g^(-1);其优异的储锂、储钠性能主要取决于Fe_(3)O_(4)和Fe_(7)S_(8)纳米棒与氮掺杂碳层的协同作用。 | 梁正 吴家豪 王畅 尚振领 王逸飞 刘严 姜付义 周艳丽 | 2022 | 化学研究2022，33，1： | 1 |
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