College of Chemistry and Molecular Sciences, Hubei Key Lab of Electrochemical Power Sources , Wuhan University , Wuhan 430072 , China.
Department of Chemistry and Chemical Biology , Cornell University , Ithaca , New York 14853 , United States.
ACS Appl Mater Interfaces. 2019 Feb 27;11(8):8025-8031. doi: 10.1021/acsami.8b21581. Epub 2019 Feb 15.
This work reports a novel Ga-based material, NiGaO, which is typically used as a photocatalyst for water splitting, as an anode for Li-ion battery with a long cycle life. High-surface-area reduced graphene oxide (rGO) has been used as the conductive substrate to avoid the aggregation of NiGaO nanoparticles (NPs). Because the size and shape of NiGaO are very sensitive to the pH of the precursor, ethylene glycol has been employed as the solvent, as well as the reduction agent to reduce GO, to avoid using extra surfactants and also to avoid the variation of pH of the precursor. The obtained NiGaO/rGO composite possesses high capacity and long cycle life (2000 cycles, 2 A/g), with NiGaO NPs around 3-4 nm that are uniformly distributed on the rGO surface. Full cell performance with LiCoO as cathode has also been studied, with the average loss of 0.04% per cycle after 100 cycles (C/2 of LiCoO). The long cycle life of the composite was ascribed to the self-healing feature of Ga formed during charging.
这项工作报道了一种新型的基于镓的材料 NiGaO，它通常被用作光解水的光催化剂，也被用作锂离子电池的阳极，具有长的循环寿命。高表面积的还原氧化石墨烯（rGO）被用作导电基底，以避免 NiGaO 纳米颗粒（NPs）的聚集。由于 NiGaO 的尺寸和形状对前驱体的 pH 值非常敏感，因此使用了乙二醇作为溶剂，以及还原 GO 的还原剂，以避免使用额外的表面活性剂，并避免前驱体 pH 值的变化。所得的 NiGaO/rGO 复合材料具有高容量和长循环寿命（2000 次循环，2 A/g），NiGaO NPs 约为 3-4nm，均匀分布在 rGO 表面。还研究了以 LiCoO 为正极的全电池性能，在 100 次循环后（LiCoO 的 C/2），平均每循环损失 0.04%。复合材料的长循环寿命归因于充电过程中形成的 Ga 的自修复特性。
