Abstract
Atomic layer deposition (ALD), as a thin film deposition technique, has been explored as a viable path to improve the performance of lithium-ion batteries. However, a trade-off between the species transport (capacity) and protection (lifetime), resulting from the insulating properties of ALD films, is the key challenge in ALD technology. Here we report a breakthrough to overcome this trade-off by coating an ultra-thin conformal conductive film by ALD on the surfaces of LiMn2O4 particles. The particles coated with optimized film thickness exhibit a significant improvement in capacity and cycling performance compared to uncoated and insulating ALD film (e.g., Al2O3 and ZrO2) coated samples both at room temperature and 55 °C for long cycling numbers.
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