A Nearly Packaging‐Free Design Paradigm for Light, Powerful, and Energy‐Dense Primary Microbatteries
Xiujun Yue, Alissa C. Johnson, Sungbong Kim, Ryan R. Kohlmeyer, Arghya Patra, Jessica Grzyb, Akaash Padmanabha, Min Wang, Zhimin Jiang, Pengcheng Sun, Chadd Kiggins, Mehmet Nurullah Ateş, Sonika V. Singh, Evan M. Beale, M. L. Daroux, Aaron J. Blake, John B. Cook, Paul V. Braun, James H. Pikul
Abstract
Abstract Billions of internet connected devices used for medicine, wearables, and robotics require microbattery power sources, but the conflicting scaling laws between electronics and energy storage have led to inadequate power sources that severely limit the performance of these physically small devices. Reported here is a new design paradigm for primary microbatteries that drastically improves energy and power density by eliminating the vast majority of the packaging and through the use of high‐energy‐density anode and cathode materials. These light (50–80 mg) and small (20–40 µL) microbatteries are enabled though the electroplating of 130 µm‐thick 94% dense additive‐free and crystallographically oriented LiCoO 2 onto thin metal foils, which also act as the encapsulation layer. These devices have 430 Wh kg −1 and 1050 Wh L −1 energy densities, 4 times the energy density of previous similarly sized microbatteries, opening up the potential to power otherwise unpowerable microdevices.