S-O bond chemically constrained NiS2/rGO nanocomposite with enhanced Na-ion storage capacity

Publication date: Available online 21 February 2020Source: Chinese Chemical LettersAuthor(s): Shuyu Zhou, Xiaozhe Jin, Shengming Zhu, Qian Luo, Zhiwen Qiu, Aimin Wu, Hao HuangABSTRACTNiS2 has become a research hotspot of anode materials for Na-ion batteries due to its high theoretical specific capacity. However, the volume effect, the dissolution of polysulfide intermediates and the low conductivity during the charge/discharge process lead to the low specific capacity and poor cycling stability. NiS2/rGO nanocomposite was prepared by a facile two-step process: GO was prepared by modified Hummers method, and then NiS2/rGO nanocomposite was synthesized by L-cys assisted hydrothermal method. NiS2/rGO nanocomposite shows excellent cycle performance and rate performance, which could be attributed to the mesoporous structure on the graphene skeleton with high conductivity. Besides, the chemical constraint of a unique S-O bond on NiS2 could inhibit the dissolution of intermediates and the loss of irreversible capacityGraphical AbstractNickel disulfidedecorated with reduced graphene oxide (NiS2/rGO) nanocomposite electrode was prepared by modified L-cys assisted hydrothermal method and shows good cycle performance and rate performance.
Source: Chinese Chemical Letters - Category: Chemistry Source Type: research