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A red phosphorus-graphite composite as anode material for potassium-ion batteries

DOI: 10.1016/j.mtener.2021.100840 DOI Help

Authors: Isaac Capone (University of Oxford) , Jack Aspinall (University of Oxford) , Hyeon Jeong Lee (University of Oxford) , Albert W. Xiao (University of Oxford) , Johannes Ihli (Paul Scherrer Institute) , Mauro Pasta (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Materials Today Energy , VOL 12

State: Published (Approved)
Published: August 2021
Diamond Proposal Number(s): 21960

Abstract: Red phosphorus (RP) is a promising anode material for potassium-ion batteries because of its theoretical capacity of 865 mAh g-1 delivered at an average potential of 0.5 V vs K+/K. However, its alloy reaction to form KP entails a volume expansion of 162% resulting in severe stresses that lead to SEI and electrode fracture, loss of electric contact, and ultimately reduced cycle life. Moreover, its low electronic conductivity (10-14 S cm-1) limits rate capability. Here, we report a RP-graphite composite prepared by a two step ball milling procedure to control particle size and optimize carbon coating. Raman operando on graphite in the composite suggests that the carbon coating reversibly expands and contracts due to the volume expansion of RP particles. Electrodes prepared with the composites achieve high capacity (723 mAh g-1P) at C/20 and retaining 75% at 5C. It also shows very good cycling stability, retaining more than 96% of the capacity after 100 cycles at 1C.

Diamond Keywords: Batteries; Potassium-ion; Electric Vehicles

Subject Areas: Materials, Chemistry, Energy

Instruments: I13-1-Coherence

Added On: 18/08/2021 08:47

Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Imaging Coherent Diffraction Imaging (CDI) Ptychography