Nowak Andrzej P, Gazda Maria, Łapiński Marcin, Zarach Zuzanna, Trzciński Konrad, Szkoda Mariusz, Mania Szymon, Li Jinjin, Tylingo Robert
Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
Materials (Basel). 2021 Mar 1;14(5):1156. doi: 10.3390/ma14051156.
Tin oxide is one of the most promising electrode materials as a negative electrode for lithium-ion batteries due to its higher theoretical specific capacity than graphite. However, it suffers lack of stability due to volume changes and low electrical conductivity while cycling. To overcome these issues, a new composite consisting of SnO2 and carbonaceous matrix was fabricated. Naturally abundant and renewable chitosan was chosen as a carbon source. The electrode material exhibiting 467 mAh g-1 at the current density of 18 mA g-1 and a capacity fade of only 2% after 70 cycles is a potential candidate for graphite replacement. Such good electrochemical performance is due to strong interaction between amine groups from chitosan and surface hydroxyl groups of SnO2 at the preparation stage. However, the charge storage is mainly contributed by a diffusion-controlled process showing that the best results might be obtained for low current rates.
氧化锡因其理论比容量高于石墨，是最具潜力的锂离子电池负极电极材料之一。然而，在循环过程中，由于体积变化和低电导率，它存在稳定性不足的问题。为克服这些问题，制备了一种由SnO₂和碳质基体组成的新型复合材料。选择天然丰富且可再生的壳聚糖作为碳源。该电极材料在18 mA g⁻¹的电流密度下表现出467 mAh g⁻¹的比容量，且在70次循环后容量仅衰减2%，是替代石墨的潜在候选材料。如此良好的电化学性能归因于在制备阶段壳聚糖的胺基与SnO₂表面羟基之间的强相互作用。然而，电荷存储主要由扩散控制过程贡献，这表明在低电流速率下可能获得最佳结果。
