The homogenous growth of Co-based coordination compound on graphene nanosheet for high-performance K-organic battery and its reaction mechanism  

作　　者：Qian-Qian Peng Yi-Ting Wang Shuo Qi Yao Xiao Yong Wang Shuang-Qiang Chen 

机构地区：[1]School of Environmental and Chemical Engineering,Shanghai University,Shanghai,200444,China [2]School of Chemistry and Materials Engineering,Wenzhou University,Wenzhou,325035,China

出　　处：《Rare Metals》2024年第4期1622-1634,共13页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.21975154 and 22179078);Shanghai Municipal Education Commission(Innovation Program:2019-01-07-00-09-E00021);the Innovative Research Team of High-level Local Universities in Shanghai。

摘　　要：Metal coordination compounds(MCCs)are gaining popularity for potassium-ion batteries(PIBs)owing to their tuneable structure,multiple reaction sites,low cost and unique morphology.However,they are generally subjected to intrinsic features of the sluggish ionic diffusion coefficient,low electronic conductivity and slow kinetics.Herein,a new MCC material of cobalt-1,3,5-trioxy-2,4,6-triamino-benzo(Co-TB)coordination compound was synthesized and homogenously grown on the surface of graphene nanosheets(GNS),forming a Co-TB@GNS composite with enhanced electronic conductivity and flexible capability.Benefiting from the overall enhanced conductivity,high surface area and abundant activated K-storage sites,Co-TB@GNS electrodes have exhibited superior cycling performance with high reversible capacities(312 mAh·g^(-1)after 100 cycles at 100 mA·g^(-1),224 mAh·g^(-1)after 500 cycles at 1 A·g^(-1))and better rate performances compared with the pure Co-TB compound when served as PIB's anodes.Furthermore,multiple in-situ measurement techniques have jointly confirmed that the organic functional groups(C=O,C=N and C=C of benzene rings)and Co^(2+)in Co-TB are the main reversible K-storage sites,including in-situ Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD),and partial capacity contribution is originated from GNS by the apparent K-storage behavior in the in-situ XRD pattern,proving the possibility of K-storage for metal-organic materials.

关 键 词：Metal coordination compounds Potassiumion battery Cobalt coordination compound K-storage mechanism 

分 类 号：O641.4[理学—物理化学] TM912[理学—化学]