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Understanding improved capacity retention at 4.3 V in modified single crystal Ni-rich NMC//graphite pouch cells at elevated temperature

DOI: 10.1039/D3LF00093A DOI Help

Authors: Galo J. Paez Fajardo (University of Warwick; The Faraday Institution) , Meltiani Belekoukia (University of Warwick; The Faraday Institution) , Satish Bolloju (University of Warwick) , Eleni Fiamegkou (University of Warwick) , Ashok S. Menon (Uppsala University; The Faraday Institution) , Zachary Ruff (University of Cambridge; The Faraday Institution) , Zonghao Shen (Imperial College London; The Faraday Institution) , Nickil Shah (University of Warwick) , Erik Bjorklund (University of Oxford; The Faraday Institution) , Mateusz Jan Zuba (Argonne National Laboratory) , Tien-Lin Lee (Diamond Light Source) , Pardeep K. Thakur (Diamond Light Source) , Robert S. Weatherup (University of Oxford; The Faraday Institution) , Ainara Aguadero (Imperial College London; CSIC, Instituto de Ciencia de Materiales de Madrid; The Faraday Institution) , Melanie J. Loveridge (University of Warwick) , Clare Grey (University of Cambridge; The Faraday Institution) , Louis F. J. Piper (University of Warwick; The Faraday Institution)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Rsc Applied Interfaces , VOL 11

State: Published (Approved)
Published: September 2023

Open Access Open Access

Abstract: The capacity retention of commercially-sourced pouch cells with single crystal Al surface-doped Ni-rich cathodes (LiNi0.834Mn0.095Co0.071O2) is examined. The degradation-induced capacity fade becomes more pronounced as the upper-cut-off voltage (UCV) increases from 4.2 V to 4.3 V (vs. graphite) at a fixed cycling temperature (either 25 or 40 °C). However, cycles with 4.3 V UCV (slightly below the oxygen loss onset) show better capacity retention upon increasing the cycling temperature from 25 °C to 40 °C. Namely, after 500 cycles at 4.3 V UCV, cycling temperature at 40 °C retains 85.5% of the initial capacity while cycling at 25 °C shows 75.0% capacity retention. By employing a suite of electrochemical, X-ray spectroscopy and secondary ion mass spectrometry techniques, we attribute the temperature-induced improvement of the capacity retention at high UCV to the combined effects of Al surface-dopants, electrochemically resilient single crystal Ni-rich particles, and thermally-improved Li kinetics translating into better electrochemical performance. If cycling remains below the lattice oxygen loss onset, improved capacity retention in industrial cells should be achieved in single crystal Ni-rich cathodes with the appropriate choice of cycling parameter, particle quality, and particle surface dopants.

Diamond Keywords: Batteries; Lithium-ion; Electric Vehicles

Subject Areas: Materials, Chemistry, Energy

Instruments: I09-Surface and Interface Structural Analysis

Added On: 27/09/2023 13:01


Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Spectroscopy X-ray Photoelectron Spectroscopy (XPS) Hard X-ray Photoelectron Spectroscopy (HAXPES)