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

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

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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 gen-erally 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-tri-oxy-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 capaci-ties(312mAh·g-1 after 100 cycles at 100mA·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 Co2+in Co-TB are the main reversible K-stor-age 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.

Metal coordination compoundsPotassium-ion batteryCobalt coordination compoundK-storage mechanism

Qian-Qian Peng、Yi-Ting Wang、Shuo Qi、Yao Xiao、Yong Wang、Shuang-Qiang Chen

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School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China

School of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShanghai Municipal Education Commission(Innovation Program)Innovative Research Team of Highlevel Local Universities in Shanghai

21975154221790782019-01-07-00-09-E00021

2024

10.1007/s12598-023-02525-4

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(4)
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