Lovett Adam J, Daramalla Venkateswarlu, Sayed Farheen N, Nayak Debasis, de H-Óra Muireann, Grey Clare P, Dutton Siân E, MacManus-Driscoll Judith L
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.
Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom.
ACS Energy Lett. 2023 Jul 18;8(8):3437-3442. doi: 10.1021/acsenergylett.3c01094. eCollection 2023 Aug 11.
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 LiMnO (LMO) thin films grown on a new current collector material, NiCoO (NCO). We achieve this at the low temperature of 360 °C, ∼200 °C lower than existing current collectors SrRuO and LaNiO. Our films achieve a discharge capacity of >100 mAh g 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.
锂离子微型电池中的外延阴极是理解跨界面的质量和电荷转移以及循环过程中的界面降解过程的理想模型系统。重要的是，如果在低于450°C的温度下生长，它们还为用于物联网、柔性电子和医疗技术设备的互补金属氧化物半导体（CMOS）兼容微型电池提供了潜力。目前，突出的外延阴极是在高温（>600°C）下生长的，这带来了制造和扩大规模的挑战。在此，我们报告了在一种新型集流体材料NiCoO（NCO）上生长的外延LiMnO（LMO）薄膜的结构和电化学研究。我们在360°C的低温下实现了这一点，比现有的集流体SrRuO和LaNiO低约200°C。我们的薄膜在约6000次循环中实现了>100 mAh g的放电容量，具有明显的LMO氧化还原特征，证明了我们的NCO集流体的长期电化学稳定性。因此，我们展示了一条为一系列小型化电子设备制造高性能微型电池的途径。
