钠
阴极
钠离子电池
热稳定性
材料科学
氧烷
电化学
容量损失
化学
吸收(声学)
化学工程
冶金
电极
复合材料
光谱学
物理化学
法拉第效率
工程类
物理
量子力学
作者
Jinqiang Gao,Ye Tian,Yu Mei,Lianshan Ni,Haoji Wang,Huanqing Liu,Wentao Deng,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji
标识
DOI:10.1016/j.cej.2023.141385
摘要
Iron-based mixed phosphates sodium ion batteries (SIBs) are promising sustainable storage devices due to the low-costing and non-toxicity characters. Whereas, their real application is seriously restricted by the sluggish Na+ diffusion and inferior intrinsic electronic conductivity. Herein, we propose mesoporous sponge-like structural Na4Fe3(PO4)2(P2O7) (NFPP) in-situ caged in carbon layer and cross-linked graphene nanosheets ([email protected]@rGO), toward fast charging and highly stable sodium ion half/full cells in a wide temperature range. This rational strategy gives the cathode superior long-lasting cycling stability, specifically, 86.7 % capacity retention is retained at 20 C for over 30,000 cycles, displaying a capacity loss less than 0.00045 % per cycle. Notably, outstanding thermal stability at 60 °C is achieved and no obvious capacity degradation can be observed after cycling for 200 times at 1 C. Furthermore, the impressive electrochemical performances of full cells are determined, ascribed to the improved electronic conductivity and structural stability (e.g. a small volume change of ∼4.1 % during sodium ion insertion/deinsertion), which is confirmed by in-situ X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES) measurements. All the results above prove that the [email protected]@rGO is of high potential for advanced energy storage system based on its low costs, long-lasting cyclability and excellent thermal stability.
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