插层(化学)
电解质
石墨
阳极
材料科学
钠
储能
电池(电)
离子
功率密度
三元运算
化学工程
阴极
无机化学
电极
化学
功率(物理)
热力学
有机化学
物理化学
复合材料
冶金
程序设计语言
工程类
计算机科学
物理
作者
Zheng‐Long Xu,Gabin Yoon,Kyu‐Young Park,Hyeokjun Park,Orapa Tamwattana,Sung Joo Kim,Won Mo Seong,Kisuk Kang
标识
DOI:10.1038/s41467-019-10551-z
摘要
Abstract Co-intercalation reactions make graphite as promising anodes for sodium ion batteries, however, the high redox potentials significantly lower the energy density. Herein, we investigate the factors that influence the co-intercalation potential of graphite and find that the tuning of the voltage as large as 0.38 V is achievable by adjusting the relative stability of ternary graphite intercalation compounds and the solvent activity in electrolytes. The feasibility of graphite anode in sodium ion batteries is confirmed in conjunction with Na 1.5 VPO 4.8 F 0.7 cathodes by using the optimal electrolyte. The sodium ion battery delivers an improved voltage of 3.1 V, a high power density of 3863 W kg −1 both electrodes , negligible temperature dependency of energy/power densities and an extremely low capacity fading rate of 0.007% per cycle over 1000 cycles, which are among the best thus far reported for sodium ion full cells, making it a competitive choice in large-scale energy storage systems.
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