Adding Nitriles to Lithium ion batteries gives them a boost
Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries. However, their working mechanisms are still mysterious, especially in practical high-voltage LiCoO2 pouch lithium-ion batteries. The LiCoO2/graphite pouch cells with the HTCN additive electrolyte possess superior cycling performance, 90% retention of the initial capacity after 800 cycles at 25 °C, and 72% retention after 500 cycles at 45 °C, which is feasible for practical application. A group of electrochemists from Tsinghua University have used advanced microscopy techniques to take a closer look at what happens at the molecular scale and identified what is going on, opening up new avenues for even further battery performance improvements.
Photo Tang, C., Chen, Y., Zhang, Z. et al. Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification. Nano Res. (2022)
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