Xiaoqing Li, Peilin Ran*, Kang Wu, Na Li, Enyue Zhao*, Yanhao Huang and Feng Wang*,
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引用次数: 0
Abstract
Lithium-ion batteries (LIBs) are limited by high costs and sustainability issues due to their cobalt content, despite their advantages in energy storage. Sodium-ion batteries (SIBs) emerge as a viable alternative because of their cost-effectiveness and abundant sodium, which is especially suitable for large-scale applications. The O3-type sodium-layered transition-metal oxide (NaxTMO2) cathode is pivotal for enhancing energy density, cost-effectiveness, and stability of SIBs. However, these cathodes are affected by poor air stability and irreversible phase transitions that degrade their electrochemical performance. To address these issues, we propose a near-surface structural modulation strategy to convert surface alkali residues into the fast ionic conductor Na2CaMg(PO4)2 (NCMP). This method relieved air sensitivity by forming a protective shield around the cathode and enhanced discharge capacity and cycling stability, demonstrating a significant increase in specific capacity, reaching 159.7 mAh/g at 0.1 C and 106.2 mAh/g at 5 C. This study demonstrates the effectiveness of NCMP coatings in improving the lifetime and performance of SIBs and proposes their general applicability in enhancing sodium-ion-layered oxide cathodes.
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.