Porous quasi-graphitic carbon sheets for unprecedented sodium storage,Inorganic Chemistry Frontiers

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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

School of Materials and Energy
University of Electronic Science and Technology of China
Chengdu
China
National Engineering Research Center of Electromagnetic Radiation Control Materials
School of Materials Science and Engineering
Shanghai Jiaotong University
Shanghai
School of Electronic Science and Engineering
School of Engineering
RMIT University
3001 Melbourne
Australia
Institute for Superconducting and Electronic Materials
University of Wollongong
Wollongong

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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