We have developed high specific energy cathode materials, low strain alloy anodes, wide temperature range compatible electrolytes, and electrode/electrolyte interface protection technologies. The specific energy ≥450Wh/kg, with a 3C rate discharge capacity retention rate of 90%. It can be discharged at -20℃ and has passed safety tests such as short circuit, overcharge, over-discharge, thermal chamber, flat panel extrusion, drop, and water immersion. It has been preliminarily applied in the small drones.