Mixed-Phase Enabled High-Rate Copper Niobate Anodes for Lithium-Ion Batteries

Bram Maarten Jager, Luuk Kortekaas, Johan E. ten Elshof, Jan-Willem G. Bos, Moniek Tromp, Mark Huijben*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The advancement of rapid-response grid energy storage systems and the widespread adoption of electric vehicles are significantly hindered by the charging times and energy densities associated with current lithium-ion battery technology. In state-of-the-art lithium-ion batteries{,} graphite is employed as the standard negative electrode material. However{,} graphite suffers from polarization and deteriorating side-reactions at the high currents needed for fast charging. Transition metal-oxide anodes are attractive alternatives due to their enhanced power density. However{,} often these anodes make use of toxic or scarce elements{,} significantly limiting their future potential. In this work{,} we propose a new{,} facile solid-state synthesis method to obtain non-toxic{,} abundant{,} mixed-phase copper niobate (CuxNbyOz) anodes for lithium-ion batteries. The material consists of various phases working synergistically to deliver high electrochemical capacities at exceptional cycling rates (167 mAh/g at 1C{,} 95 mAh/g at 10C{,} 65 mAh/g at 60C and 37 mAh/g at 250C){,} large pseudocapacitive response (up to 90%){,} and high Li+ diffusion coefficient (1.8 × 10−12 cm2/s){,} at a stable capacity retention (99.98%) between cycles. Compared to graphite{,} at a comparable energy density (470 Wh/L){,} the composite material exhibits a 70 times higher power density (27000 W/L). These results provide a new perspective on the role of non-toxic and abundant elements for realizing ultrafast anode materials for future energy storage devices."
Original languageEnglish
Number of pages13
JournalJournal of Materials Chemistry A
DOIs
Publication statusE-pub ahead of print - 8-Jan-2025

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