Issue 13, 2021

Copper phosphide as a promising anode material for potassium-ion batteries

Abstract

Potassium-ion batteries (PIBs) have attracted great attention due to the abundance and low cost of potassium resources. However the search for novel electrode materials with high volumetric-capacity for PIBs remains challenging. Here, we report an attractive Cu3P/carbon black anode material for potassium storage through a productive and cheap milling process. The Cu3P particles were homogeneously mixed with the amorphous carbon matrix. The carbon matrix effectively buffers the volume change and improves conductivity; meanwhile the P–C bond formed through the ball milling process can effectively connect the particles and stabilize the structure. Consequently, the fabricated Cu3P/carbon black composite delivered a capacity of 174 mA h g−1 at 1 A g−1 and remained stable for 300 cycles. The potassium storage mechanism is analysed and revealed by in situ synchrotron X-ray diffraction and ex situ high resolution transmission electron microscopy where a reversible mechanism was observed. The results prove the feasible utilization of Cu3P as a promising anode material for practical application of PIBs.

Graphical abstract: Copper phosphide as a promising anode material for potassium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
26 Nov 2020
Accepted
13 Feb 2021
First published
15 Feb 2021

J. Mater. Chem. A, 2021,9, 8378-8385

Copper phosphide as a promising anode material for potassium-ion batteries

Q. Yang, Z. Tai, Q. Xia, W. Lai, W. Wang, B. Zhang, Z. Yan, J. Peng, H. Yang, H. Liu, Q. Gu, S. Chou and H. Liu, J. Mater. Chem. A, 2021, 9, 8378 DOI: 10.1039/D0TA11496K

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