1 research outputs found
Low Temperature Epitaxial LiMn<sub>2</sub>O<sub>4</sub> Cathodes Enabled by NiCo<sub>2</sub>O<sub>4</sub> Current Collector for High-Performance Microbatteries
Epitaxial cathodes in lithium-ion microbatteries are
ideal model
systems to understand mass and charge transfer across interfaces,
plus interphase degradation processes during cycling. Importantly,
if grown at <450 °C, they also offer potential for complementary
metal–oxide–semiconductor (CMOS) compatible microbatteries
for the Internet of Things, flexible electronics, and MedTech devices.
Currently, prominent epitaxial cathodes are grown at high temperatures
(>600 °C), which imposes both manufacturing and scale-up challenges.
Herein, we report structural and electrochemical studies of epitaxial
LiMn2O4 (LMO) thin films grown on a new current
collector material, NiCo2O4 (NCO). We achieve
this at the low temperature of 360 °C, ∼200 °C lower
than existing current collectors SrRuO3 and LaNiO3. Our films achieve a discharge capacity of >100 mAh g–1 for ∼6000 cycles with distinct LMO redox signatures,
demonstrating long-term electrochemical stability of our NCO current
collector. Hence, we show a route toward high-performance microbatteries
for a range of miniaturized electronic devices