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Nano-Micro Letters · 2019 ·Vol. 11 ·期 1 ·1-12 · IF 9.043

Rational Design of Layered SnS2 on Ultralight Graphene Fiber Fabrics as Binder-Free Anodes for Enhanced Practical Capacity of Sodium-Ion Batteries

Ren Zongling,Wen Jie,Liu Wei,Jiang Xiaoping,Dong Yanheng,Guo Xiaolong,Zhao Qiannan,Ji Guipeng,Wang Ronghua,Hu Ning,Qu Baihua,Xu Chaohe

Layered SnS 2 nanosheets/reduced graphene fiber (SnS 2 @rGF) hybrid fabrics were fabricated as binder-free electrodes. Ultralight rGF fabrics could increase the active materials loading to a high level of 67.2 wt% in the whole electrode, which is much higher than that of traditional slurry coating electrodes by using Cu or Al foil as current collectors. The practical capacity based on the weight of electrode could increase to as high as ~ 538 mAh g −1 exceeding to the slurry coating electrodes.

CAS / MDL: 7440-23-5

研究领域: 材料科学 · 能源存储

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Journal of Materials Chemistry A · 2022 ·Vol. 10 ·期 37 ·19953-19962 · IF 14.511

A general strategy to enhance the electrochemical activity and energy density of energy-storage materials through using sintering aids with redox activity: a case study of Mo4Nb26O77

Songjie Li,Jiazhe Gao,Yinjun Ou,Wenze Wang,Qian Zhang,Shangfu Gao,Xuehua Liu,Chunfu Lin

The solid-state reaction method for energy-storage material preparations is simple and cost effective, thereby being suitable for industrialization. However, its sintering temperatures are generally high, resulting in large-sized (>1 μm) primary particles with low electrochemical activity. Here, based on a Mo4Nb26O77 model material, we explore a general modification of the solid-state reaction method through using sintering aids with redox activity and successfully prepare Mo4Nb26O77 with submicron-sized (∼200 nm) primary particles at a low sintering temperature of only 700 °C. The resultant high electrochemical activity of Mo4Nb26O77 and its additional Mo-based redox activity which originated from the MoO3 sintering aid enable its large practical capacity of 366 mA h g−1, which is the largest in the field of niobate anode materials. Mo4Nb26O77 further exhibits a relatively low working potential since more Nb4+ ions are reduced to Nb3+ ions at low potentials. Additionally, Mo4Nb26O77 has high rate performance and good cyclability when external Li+ ions mainly occupy the interstices between the (010) crystallographic planes of its open and stable shear ReO3 crystal structure. Good low-temperature electrochemical properties are also achieved as a result of the high electrochemical activity. Therefore, this anode material has great practicability for high-performance Li+ storage.

CAS / MDL: 12057-17-9

研究领域: 材料科学 · 电化学 · 能量存储

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Rational Design of Layered SnS2 on Ultralight Graphene Fiber Fabrics as Binder-Free Anodes for Enhanced Practical Capacity of Sodium-Ion Batteries

A general strategy to enhance the electrochemical activity and energy density of energy-storage materials through using sintering aids with redox activity: a case study of Mo4Nb26O77