Beyond single-target sensing: Space-time-coding metasurface enables simultaneous multi-liquid intelligent detection
Peer-Reviewed Publication
Updates every hour. Last Updated: 21-Aug-2025 20:11 ET (22-Aug-2025 00:11 GMT/UTC)
In a paper published in National Science Review, Professor Yan Shi and his graduate student Shihan Dai from Xidian University, China, proposed a novel multi-target simultaneous intelligent detection approach based on space-time-coding metasurfaces and software defined radio technologies, with experimental validation across diverse liquid samples under complicated ambient conditions.
The reactive oxygen species (O*) released from the Nickel-rich layered oxide cathodes (LiNixCoyMn1−x−yO2, NCM) are responsible for triggering thermal runaway (TR) in lithium-ion batteries (LIBs). Specifically, the charge compensation from transition metal (TM) 3d to oxygen (O) 2p in NCM plays a pivotal role in O* release. Here, inspired by the strong chelating effect of sodium phytate (PN) on TM, this study utilizes PN as a cathode additive to interact with nickel, weaken the charge compensation of TM 3d to O 2p on the surface of LiNi0.8Co0.1Mn0.1O2 (NCM811) and enhance the battery safety. It is shown that the chelation successfully stabilizes lattice oxygen and inhibits O* release, preventing harmful phase transitions in NCM811 and attenuating heat generation from O* related crosstalk reactions. Consequently, the TR trigger temperature (Ttr) of NCM811 pouch cell with PN increases from 125.9 to 184.8 °C, while the maximum temperature (Tmax) decreases from 543.7 to 319.7 °C. Moreover, the PN-modified layer allows NCM811 to be cycled stably for over 700 cycles at 4.6 V. This strategy provides a facile method for stabilizing lattice oxygen in NCM, inhibiting O*-triggered TR, and enhancing high-voltage performance.
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