The influence of Al and Ga doping on the chemical and electrochemical cycling of T-LiFeO 2 Suraj Mahato 1 , Xabier Martinez De Irujo Labalde 1 , Samuel Booth 2 and Michael Hayward 1 1 University of Oxford, UK, 2 The University of Sheffield, UK Li-ion batteries have transformed our daily life by acting as energy-dense,rechargeable power sources for a wide range of electronic devices. Exploration of alternative energy materials is required to satisfy the current and future demands of renewable energy in the grid storage and transport industry. Due to limitations on the supply, cobalt and nickel-derived cathodes would face problems being applied on a larger scale. To address this challenge, as part of the Future Cat project, we are studying Fe-based cathode materials which could be used for large-scale applications and it would deliver high energy density owing to Fe 3+ /Fe 4+ redox. Initially, we decided to stabilize the T-LiFeO 2 structure by substituting Fe with Al and Ga keeping the atomic arrangements unaltered in the framework. Previously, it was reported that during cycling a structural transformation took place forming the spinel LiFe 5 O 8 phase , irreversible oxygen loss and capacity fading were also observed. LiFe 1-x M x O 2 (M = Al, Ga) samples were prepared and subjected to chemical and electrochemical lithiation, and the effect on the structure, bonding, and oxidation state at various lithium contents was monitored with XRD, SXRD, XANES, titration, and SQUID measurements. The effect of Al and Ga pillaring the T-LiFeO 2 structure during the chemical lithium insertion will be discussed in detail in the presentation. References 1. R. Armstrong et al., J. Am. Chem. Soc . 2008, 130, 3354-3559Y. Li et al., Nano Energy 47 (2018) 519-526
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