Ultra-Thin, Lightweight, and Safe Li-ion Rechargeable Batteries for Next-Generation Wearables and IoT Devices

The growing demand for compact, high-performance electronics—from medical wearables to next-generation IoT devices—requires battery technologies that are safe, lightweight, and space-efficient. We present ultra-thin, rechargeable Li-ion batteries featuring a semi-solid-state design with crystal-oriented ceramic electrodes. This architecture reduces liquid electrolyte content and removes organic binders, improving safety and thermal stability. Engineered for fast charging and seamless integration into skin-contact and miniaturised devices, our technology supports a wide range of applications across healthcare, consumer electronics, and industrial IoT. In addition, EnerCera batteries realise exceptionally low self-discharge, making them highly compatible with energy harvesting systems such as photovoltaic cells, ideal for autonomous IoT devices requiring long-term operation without frequent maintenance.