As humanity endeavors to explore distant stars, the depths of the ocean, the interior of the Earth, and the harshest of cold regions, a dependable and robust energy system stands as a pivotal cornerstone for a myriad of missions. Yet, the "three depths and one extreme" environments—deep space, deep sea, deep earth, and polar regions—are fraught with complex challenges such as extreme temperatures, ultra-high pressures, low vacuum, intense radiation, and corrosive conditions. These harsh conditions give rise to issues including battery material anomalies, thermal runaway, radiation damage, and performance degradation, thereby posing significant hurdles to the energy density, power density, lifespan, and safety of energy storage devices. Recognizing this, in May 2025, Academician Wu Feng and Professor Chen Renjie from the School of Materials Science and Engineering at Beijing Institute of Technology embarked on a research journey to tackle these challenges head-on.