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The Efficient K Ion Storage of M 2 P 2 O 7 /C (M=Fe, Co, Ni) Anode Derived from Organic‐Inorganic Phosphate Precursors
Author(s) -
Zhang Yibo,
Zheng Yuying,
Geng Hongbo,
Yang Yang,
Ye Minghui,
Zhang Yufei,
Chao Li Cheng
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202100219
Subject(s) - anode , materials science , electrochemistry , annealing (glass) , intercalation (chemistry) , chemical engineering , electrode , inorganic chemistry , chemistry , metallurgy , engineering
Metal phosphates have been widely explored in lithium ion batteries and sodium ion batteries owing to high theoretical capacities, mild toxicity and low cost. However, their potassium ion battery applications are less reported due to the limited conductivity and the slow diffusion kinetics. Considering these drawbacks, novel structured M 2 P 2 O 7 /C (M=Fe, Co, Ni) nanoflake composites are prepared through an organic‐phosphors precursor‐assisted solvothermal method and a subsequent high temperature annealing process. The designed Co 2 P 2 O 7 /C composite exhibits the highest rate capacity with 502 mAh g −1 at 0.1 A g −1 and good cyclability for 900 cycles at 1 A g −1 and 2 A g −1 when compared with Ni and Fe based composites. The superior electrochemical performance can be attributed to their unique nanoparticle‐assembled nanoflake structure, which can afford enough active sites for K + intercalation. In addition, the robust pyrophosphate crystal structure and the in situ formed carbon composition also have positive effects on enhancing the long‐term cycling performance and the electrode's conductivity. Finally, this organic‐phosphors precursor induced simple approach can be applied for easy fabrication of other pyrophosphate/carbon hybrids as advanced electrodes.