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Porous quasi-graphitic carbon sheets for unprecedented sodium storage
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-05-18 , DOI: 10.1039/d0qi00325e
Yifan Liu 1, 2, 3, 4, 5 , Siyan Liu 4, 6, 7, 8 , Ziyi Liu 1, 2, 3, 4 , Haoxiang Tian 1, 2, 3, 4 , Zexiao Li 1, 2, 3, 4 , Hua Su 2, 3, 4, 9 , Yuanxun Li 2, 3, 4, 9 , Nasir Mahmood 10, 11, 12, 13 , Xian Jian 1, 2, 3, 4, 5 , Huakun Liu 13, 14, 15, 16
Affiliation  

The large size of sodium ions (Na+) restricts the choice of electrode materials; therefore, to realize low-cost energy storage systems, exceptional electrodes are required. Here, we have overcome this bottleneck by developing porous quasi-graphitic carbon (PGC) sheets at the surface of water-soluble KCl crystals as a green catalyst. The KCl crystals not only avoid the use of hazardous chemicals but also provide easy manipulation of the structural and surface chemistry of PGC sheets on a large-scale. The as-synthesized PGC sheets are enriched with micropores and amorphous reservoirs, which serve as mass transport channels and storage sites for Na+, respectively. Interestingly, when PGC sheets are employed as an anode in the sodium-ion battery, they showed an excellent reversible specific capacity of 237 mA h g−1 with outstanding cyclic stability by retaining 83.5% capacity after 250 cycles at 0.1 A g−1 at a capacity decay of 0.07% per cycle, while remaining stable up to 550 cycles when tested at 0.5 A g−1. Thus, the simple synthesis and large-scale production of PGC with high sodium storage capacity make it a potential candidate for secondary ion batteries.

中文翻译:

多孔的准石墨碳板,用于空前的钠存储

钠离子(Na +)的大尺寸限制了电极材料的选择;因此,为了实现低成本的能量存储系统,需要特殊的电极。在这里,我们通过在水溶性KCl晶体表面作为绿色催化剂开发多孔准石墨碳(PGC)片材,克服了这一瓶颈。KCl晶体不仅避免使用有害化学物质,而且还可以轻松大规模地控制PGC板材的结构和表面化学性质。合成后的PGC薄板富含微孔和无定形储层,可作为Na +的质量传输通道和存储位点, 分别。有趣的是,当PGC片材用作钠离子电池的阳极时,它们显示出237 mA hg -1的优异可逆比容量,具有出色的循环稳定性,通过在0.1 A g -1下于250 A循环后保持83.5%的容量。在0.5 A g -1下测试时,每个周期的容量衰减为0.07%,同时在550个周期内保持稳定。因此,具有高钠储存容量的PGC的简单合成和大规模生产使其成为二次离子电池的潜在候选者。
更新日期:2020-06-30
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