微晶
阳极
碳纤维
材料科学
储能
化学工程
煤
法拉第效率
碳捕获和储存(时间表)
阴极
钠
纳米技术
化学
电极
复合材料
有机化学
冶金
地质学
物理
结晶学
气候变化
物理化学
功率(物理)
工程类
海洋学
复合数
量子力学
作者
He Chen,Ning Sun,Qizhen Zhu,Razium Ali Soomro,Bin Xu
标识
DOI:10.1002/advs.202200023
摘要
Sodium-ion batteries (SIBs) are regarded as a kind of promising candidate for large-scale energy storage technology. The development of advanced carbon anodes with high Na-storage capacity and initial Coulombic efficiency (ICE) from low cost, resources abundant precursors is critical for SIBs. Here, a carbon microcrystalline hybridization route to synthesize hard carbons with extensive pseudo-graphitic regions from lignite coal with the assistance of sucrose is proposed. Employing the cross-linked interaction between sucrose and lignite coal to generate carbon-based hybrid microcrystalline states, the obtained hard carbons possess pseudo-graphitic dominant phases with large interlayer spaces that facilitate Na ion's storage and transportation, as well as fewer surface defects that guarantee high ICE. The LCS-73 with an optimum cross-link demonstrates the highest Na-storage capacity of 356 mAh g-1 and an ICE of 82.9%. The corresponding full-cell delivers a high energy density of 240 Wh kg-1 (based on the mass of anode and cathode materials) and excellent rate capability of 106 mAh g-1 at 10 C in addition to outstanding cycle performance with 80% retention over 500 cycles at 2 C. The proposed work offers an efficient route to develop high-performance, low-cost carbon-based anode materials with potential application for advanced SIBs.
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