JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Chaoye Zhu,Yao Zhang,Ziqiang Wu,Zhihong Ma,Xinli Guo,Fuyi Guo,Jiakun Zhang,Yushu Li
Both silicon and tin are promising anodes for new generation lithium ion batteries due to high lithium storage capacities (theoretically 4200 mA h g −1 and 992 mA h g -1 , respectively). However, their large volumetric expansions (both are above 300 %) usually lead to poor cycling stability. In this case, we synthesized closely packed Si@C and Sn@C nano-particles anchored by reduced graphene oxide (denoted as Si@C/Sn@C/rGO) by the way of solution impregnation and subsequent hydrogenation reduction. Sn particles with a diameter of 100 nm are coated by carbon and surrounded by Si@C particles around 40 nm in average diameter through the high-resolution transmission electron microscopy. Expansions of Si and Sn are alleviated by carbon shells, and reduced graphene oxide sheets accommodate their volume changes. The prepared Si@C/Sn@C/rGO electrode delivers an enhanced initial coulombic efficiency (78 %), rate capability and greatly improved cycle stability (a high reversible capacity of nearly 1000 mA h g −1 is achieved after 300 cycles at a current density of 1000 mA g −1 ). It can be believed that packing Sn@C nano-particles with Si@C relieves the volume expansion of both and releases the expansion stresses. Sn@C particles enhance anode process kinetics by reducing charge transfer resistance and increasing lithium ion diffusion coefficient . The present work provides a viable strategy for facilely synthesizing silicon-tin-carbon composite anode with long life.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shouhui Chen,Rihui Zhou,Yaqin Chen,Ping Li,Yonghai Song,Li Wang
Zeolitic imidazolate frameworks are a class of metal organic frameworks which are very attractive for their pore structures. However, their pore size and the BET surface would shrink when they underwent heat treatment at high temperature. On the other hand, liquid metal in MOFs might flow through the pores and prevent the shrinkage when pyrolysis. As is known that metallic Sn is liquid when the temperature is above 232 °C, flowing Sn might support and maintain the porous structure of MOFs during the pyrolysis. In this work, porous Sn/C-ZnO core-shell structures were prepared as anodes for LIBs via a two-step method. Firstly, SnO 2 particles were encapsulated in a ZIF-8 layer with different thickness. Then Sn/C-ZnO was generated in inert atmosphere at 700 °C. A Sn/C-ZnO composite, with 11.2% of Sn and 21.0% of ZnO in content, had a BET surface of 32.9 m 2 g -1 . Another Sn/C-ZnO composite, with 55.1% of Sn and 1.8% of ZnO in content, had a larger BET surface of 297 m 2 g -1 . Then the two composites were tested as anodes for LIBs. Although the BET surface of the former was significantly less than that of the latter before cycling and the content of Sn in the former was also much lower than that of the latter, the discharge capacity of the former after 50 cycles was 515.6 mAh g -1 at 100 mA g -1 in the potential of 0.01~3.00 V, which was slightly higher than that of the latter.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Energy Technology
·
2022
·Vol. 10
·期 4
·2101024
·
IF 4.149
Zihao Xu,Jinrui Ye,Youya Pan,Kai Liu,Xiaofang Liu,Jianglan Shui
Sodium-ion battery (SIB) is regarded as the next generation of large-scale energy storage systems, but it still faces problems such as low energy density, severe expansion/contraction of electrode volume, and poor cycle performance. Herein, necklace-like Sn-MOF@PAN fibers are prepared by the electrospinning method and then carbonized into Sn-C necklace paper as the binder-free cathode in an SIB. In each bead, Sn nanoparticles are wrapped by a porous carbon shell. The morphology and composition of the necklace-shaped Sn@C nanofibers are optimized by adjusting the ratio of Sn-MOF/PAN in the precursor. Sn@C with the optimal composition has a high specific capacity of 207 mAh g −1 even at a high current density of 2 A g −1 and maintains a specific capacity of 327 mAh g −1 after 100 cycles at a current density of 100 mA g −1 . This research provides a high-performance flexible electrode for SIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 45
·19122-19130
·
IF 0
Wei Ni,Jianli Cheng,Lingying Shi,Xiaodong Li,Bin Wang,Qun Guan,Ling Huang,Guifang Gu,Hang Li
A novel style of Sn/C yolk–shell nanospheres integrated into nanofibrous 3D electric conducting structures as free-standing materials for potential applications such as new-generation anode structures for gel-type lithium-ion batteries via the design principle of inhibiting the aggregation of tin nanoparticles, buffering the occurring volume strain, and the flexible conductive networks.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Shuai Fan,Zihao Fan,Huiyuan Cheng,Manman Feng,Xuemei Wu,Dongwei Pan,Fujun Cui,Gaohong He
A 3D integrated hierarchical porous N-doped Sn/CNT@N C gas diffusion electrode is proposed via phase inversion to synergistically improve electron-proton-gas transfer and efficiency of CO 2 reduction reaction (CO2RR). Hierarchical porous structure is tuned by the carbon nanotube additive during phase inversion, which integrates microporous layer and diffusion layer to decrease mass transfer resistance comparing with the 2D layer structure of commercial carbon paper . XPS results show that Sn/CNT@N C 800 contains pyridinic nitrogen and pyrrolic nitrogen with catalytic activity. EIS and LSV curves show that Sn/CNT@N C 800 is beneficial to reduce mass transfer resistance and increase current density after twice hydrophobic treatments. As a result, Sn/CNT@N C 800 shows higher CO 2 RR electrocatalytic activity. The reaction rate and Faraday efficiency of CO at 12 mA cm −2 increase by 40.2% and 40.6%, respectively compared with Sn/carbon paper. The reaction rate and Faraday efficiency of formate are also slightly higher than those of Sn/carbon paper.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2021
·
IF 8.001
Wei Zhang,Zhenlin Li,Canying Zhang,Yusheng Lin,Haitao Zhu,Zhaoguo Meng,Daxiong Wu
Volumetric solar steam generation has attracted substantial interest due to its low cost, minimum carbon footprint and wide application in many areas including clean water production, desalination , and wastewater treatment . However, the efficiency of volumetric solar evaporation is still low and there is an urgent need to investigate the fundamental of the limitation of low efficiency and find a new strategy to improve the solar evaporation efficiency. In the current work, antimony doped tin oxide@carbon (ATO@C) nanofluids were prepared by a hydrothermal approach. The ATO@C nanofluids exhibit broad-band and high absorption in the solar spectrum due to the complementary effect of C (in visible region) and ATO (in the near infrared region). ATO@C nanofluids of 0.3 wt% could harvest 99.9% of the incident solar energy within 1 cm penetration distance. The photothermal conversion efficiency is 97.8%. The coupling relationship between the solar harvesting and the energy distribution was revealed. Increasing mass fraction and reducing thickness can localize the heat in the surface layer of nanofluids and thus minimize the energy consumption in heating water (internal energy) and therefore improve the solar evaporation efficiency. A high evaporation efficiency of 88.6% was achieved in this way.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Wang Yao,Jiaojiao Zhao,Qiang Li,Chujie Yu,Xuli Ding
The development of high-performance anode material for sodium-ion batteries remains a challenge because of their low capacity, which limits their commercial application. Compared with carbon-based materials, metallic Sb and SnO-based anodes have received extensive attention because of their high theoretical specific capacity and safe working potential. The main problem faced is the serious volume expansion during charging and discharging, leading to irreversible loss of capacity and poor cycle life. In this paper, Sb/SnO@C composite material with adjustable ratio of Sb/SnO was prepared via electrospinning by encapsulating Sb and SnO particles in lantern-like carbon nanocages which connected through the nanofibers . The unique structure can not only effectively mitigate the volume changes during the cycle, but also provide multiple effective paths for ion and electron transport . The kinetic analysis is further performed with the assist of CV and EIS . The results show that the prepared composite can provide impressive Na + ions storage and transport performance, and can still deliver a reversible charging capacity of 413mAhg −1 after 200 cycles at a current density of 50mAg −1 , with a capacity retention ratio of 84%. This work provides a new strategy for the development of sodium ion batteries with high capacity and stable cycle performance.
研究领域:
材料科学
·
电化学
·
纳米科技
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能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）