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A Novel Graphene Oxide Wrapped Na2Fe2(SO4)3/C Cathode Composite for Long Life and High Energy Density Sodium‐Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-08-06 , DOI: 10.1002/aenm.201800944 Mingzhe Chen 1 , David Cortie 1 , Zhe Hu 1 , Huile Jin 2 , Shun Wang 2 , Qinfen Gu 3 , Weibo Hua 4 , Enhui Wang 1, 5 , Weihong Lai 1 , Lingna Chen 6 , Shu-Lei Chou 1 , Xiao-Lin Wang 1 , Shi-Xue Dou 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-08-06 , DOI: 10.1002/aenm.201800944 Mingzhe Chen 1 , David Cortie 1 , Zhe Hu 1 , Huile Jin 2 , Shun Wang 2 , Qinfen Gu 3 , Weibo Hua 4 , Enhui Wang 1, 5 , Weihong Lai 1 , Lingna Chen 6 , Shu-Lei Chou 1 , Xiao-Lin Wang 1 , Shi-Xue Dou 1
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The cathode materials in the Na‐ion battery system are always the key issue obstructing wider application because of their relatively low specific capacity and low energy density. A graphene oxide (GO) wrapped composite, Na2Fe2(SO4)3@C@GO, is fabricated via a simple freeze‐drying method. The as‐prepared material can deliver a 3.8 V platform with discharge capacity of 107.9 mAh g−1 at 0.1 C (1 C = 120 mA g−1) as well as offering capacity retention above 90% at a discharge rate of 0.2 C after 300 cycles. The well‐constructed carbon network provides fast electron transfer rates, and thus, higher power density also can be achieved (75.1 mAh g−1 at 10 C). The interface contribution of GO and Na2Fe2(SO4)3 is recognized and studied via density function theory calculation. The Na storage mechanism is also investigated through in situ synchrotron X‐ray diffraction, and pseudocapacitance contributions are also demonstrated. The diffusion coefficient of Na+ ions is around 10−12–10−10.8 cm2 s−1 during cycling. The higher working voltage of this composite is mainly ascribed to the larger electronegativity of the element S. The research indicates that this well‐constructed composite would be a competitive candidate as a cathode material for Na‐ion batteries.
中文翻译：
新型石墨烯包裹的Na2Fe2（SO4）3 / C阴极复合材料，用于长寿命和高能量密度的钠离子电池
Na-离子电池系统中的正极材料始终是阻碍其广泛应用的关键问题，因为它们的相对容量较低且能量密度较低。石墨烯包裹的复合材料Na 2 Fe 2（SO 4）3 @ C @ GO是通过一种简单的冷冻干燥方法制成的。所制备的材料可以提供3.8 V的平台，在0.1 C（1 C = 120 mA g -1）时的放电容量为107.9 mAh g -1，并且在放电后以0.2 C的放电速率提供90％以上的容量保持率300个循环。结构良好的碳网络可提供快速的电子传输速率，因此，也可以实现更高的功率密度（75.1 mAh g -1在10 C）。通过密度泛函理论计算，认识和研究了GO与Na 2 Fe 2（SO 4）3的界面贡献。还通过原位同步加速器X射线衍射研究了Na的存储机理，还证明了伪电容的贡献。Na +离子的扩散系数约为10 -12 –10 -10.8 cm 2 s -1在骑自行车的时候。该复合材料的较高工作电压主要归因于元素S的较大电负性。研究表明，结构良好的复合材料将成为Na离子电池正极材料的有竞争力的候选材料。
更新日期：2018-08-06
中文翻译：
新型石墨烯包裹的Na2Fe2（SO4）3 / C阴极复合材料，用于长寿命和高能量密度的钠离子电池
Na-离子电池系统中的正极材料始终是阻碍其广泛应用的关键问题，因为它们的相对容量较低且能量密度较低。石墨烯包裹的复合材料Na 2 Fe 2（SO 4）3 @ C @ GO是通过一种简单的冷冻干燥方法制成的。所制备的材料可以提供3.8 V的平台，在0.1 C（1 C = 120 mA g -1）时的放电容量为107.9 mAh g -1，并且在放电后以0.2 C的放电速率提供90％以上的容量保持率300个循环。结构良好的碳网络可提供快速的电子传输速率，因此，也可以实现更高的功率密度（75.1 mAh g -1在10 C）。通过密度泛函理论计算，认识和研究了GO与Na 2 Fe 2（SO 4）3的界面贡献。还通过原位同步加速器X射线衍射研究了Na的存储机理，还证明了伪电容的贡献。Na +离子的扩散系数约为10 -12 –10 -10.8 cm 2 s -1在骑自行车的时候。该复合材料的较高工作电压主要归因于元素S的较大电负性。研究表明，结构良好的复合材料将成为Na离子电池正极材料的有竞争力的候选材料。
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