Materials
·
2021
·Vol. 14
·期 12
·3193
·
IF 3.623
Tu Lan,Xiaolong Guo,De Li,Yong Chen
The memory effect of lithium-ion batteries (LIBs) was first discovered in LiFePO4, but its origin and dependence are still not clear, which is essential for regulating the memory effect. In this paper, a home-made spray drying device was used to successfully synthesize LiFePO4with an average particle size of about 1 μm, and we studied the influence of spray drying temperature on the memory effect of LiFePO4in LIBs. The results showed that the increasing of spray drying temperature made the memory effect of LiFePO4strengthen from 1.3 mV to 2.9 mV, while the capacity decreased by approximately 6%. The XRD refinement and FTIR spectra indicate that the enhancement of memory effect can be attributed to the increment of Li–Fe dislocations. This work reveals the dependence of memory effect of LiFePO4on spray drying temperature, which will guide us to optimize the preparation process of electrode materials and improve the management system of LIBs.Keywords:LiFePO4;spray drying method;memory effect;cathode materials
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2017
·Vol. 23
·期 7
·1783-1791
·
IF 2.062
Cao JiaLi,Ni Liang,Qin CanCan,Tang YueFeng,Chen YanFeng
Hierarchical Na 2 FeP 2 O 7 spheres with nanoparticles were successfully fabricated by a facile spray drying method. A relatively low drying temperature was introduced in order to form a carbon layer on the surface. As a cathode material for sodium-ion batteries, it delivered a reversible capacity of 84.4 mAh g −1 at 0.1 C and showed excellent cycling and rate performance (64.7 mAh g −1 at 5 C). Furthermore, a full sodium battery was fabricated using SP-Na 2 FeP 2 O 7 as the cathode and hard carbon as the anode, suffering almost no capacity loss after 400 cycles at 1 C. Due to its superior electrochemical property and the low materials cost, Na 2 FeP 2 O 7 is becoming a promising cathode material for large-scale energy storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Fan Yang,He Zhang,YiJia Shao,Huiyu Song,Shijun Liao,Jianwei Ren
High-performance ferric phosphate (FePO 4 ), with well-defined ellipsoid morphology and uniform particle size distribution , is successfully fabricated via a green spray drying method with formic acid as additive. It is found that the added formic acid plays a crucial role for the formation of the well-distributed FePO 4 particles. Benefited by the outstanding structure and properties of ferric phosphate prepared above, a high performance of lithium iron phosphate (LiFePO 4 ) has been prepared. It exhibits high capacity, especially at high charging/discharging rate (158.4 mAh g −1 at 0.2 C and 107.3 mAh g −1 at 10 C), and excellent cycling stability (without capacity fading after cycling for 200cycles at 1 C). All these impressive electrochemical performance could be ascribed to the FePO 4 precursor, and further attributed to the addition of formic acid, which may play as a template, resulting in the well-defined morphology, uniform particles size distribution, hierarchical pore structure , and high surface area of the ferric phosphate.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Nadia Gholampour,Somboon Chaemchuen,Zhi-Yi Hu,Bibimaryam Mousavi,Gustaaf Van Tendeloo,Francis Verpoort
In-situ fabrication of palladium(0) nanoparticles inside zeolitic imidazolate frameworks (ZIF-8) has been established via one-step facile spray-dry technique. Crystal structures and morphologies of the Pd@ZIF-8 samples are investigated by powder XRD, TEM, SAED, STEM, and EDX techniques. High angle annular dark field scanning transmission electron microscopy (HAAD-STEM) and 3D tomographic analysis confirm the presence of palladium nanoparticles inside the ZIF-8 structure. The porosity, surface area and N 2 physisorption properties are evaluated for Pd@ZIF-8 with various palladium contents. Furthermore, Pd@ZIF-8 samples are effectively applied as heterogeneous catalysts in alkenes hydrogenation. This straightforward method is able to speed up the synthesis of encapsulation of metal nanoparticles in metal organic frameworks.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Hanyi Nan,Fa Luo,Hongyao Jia,Haijun Pan,Zhibin Huang,Hongwei Deng,Yuchang Qing,Chunhai Wang,Qiang Chen
Based on the concept of environment-friendly development strategy, green preparation method is crucial. Therefore, starch-derived micron solid carbon spheres (SCs) were fabricated via spray-drying followed by carbonization processing, in which is no any harmful substances in whole process. Through tuning the carbonization temperature, SCs with a moderate degree of graphitization and intrinsic defects can be obtained. The microstructure, permittivity and microwave absorption of SCs were studied. Results show that the SCs with a larger number of micropores is composed of nanocrystalline regions and amorphous areas. The paraffin-based composites with 25 wt% SCs carbonized at 800 °C displays a strong microwave loss feature, the minimum reflection loss of −64.8 dB at 9.02 GHz with thickness of 2.57 mm. Meanwhile, the effective absorption band (<-10 dB) can reach 3.1 GHz with the thickness of 2.22 mm, covering 78% of X-band, which because of its good impedance matching and dielectric loss ability resulted from the synergistic effect between the microstructure and graphitization. This work offers a facile, larger-scale and environmental-friendly method for the preparation of micron carbon-based absorbents that can serves as an alternative to nano-scale absorbents to overcome the poor dispersion of nanoparticle in the matrix.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Tang Shibao,Zhang Xiaoping,Sui Yulei,Wang Bingjue,Li Jiangpeng,Wu Ling
Na2Fe0.6Mn0.4PO4F/C composite materials are synthesized with various carbon sources via a simple spray-drying method in this study, and the effect of carbon sources on structure, morphology, and electrochemical properties of Na2Fe0.6Mn0.4PO4F/C materials are investigated in detail. XRD and SEM results indicate that the reduction ability of carbon sources has a key impact on the structure and morphology of Na2Fe0.6Mn0.4PO4F/C composite materials. Among these Na2Fe0.6Mn0.4PO4F/C materials, the sample prepared with ascorbic acid presents a uniform hollow spherical architecture. Electrochemical analysis demonstrates that the Na2Fe0.6Mn0.4PO4F/C sample prepared with ascorbic acid has optimal electrochemical performance. The sample shows high discharge capacities of 95.1 and 48.1 mAh g−1 at 0.05C and 1C rates, respectively, and it exhibits an improved cycle stability (91.7% retention after 100 cycles at 0.5C), which are superior to Na2Fe0.6Mn0.4PO4F/C materials prepared with other carbon sources. This study demonstrates that the reduction ability of carbon sources significantly influences the electrochemical properties of fluorophosphate/C composite materials. This work also provides a promising strategy to obtain high performance cathode materials for sodium-ion batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2017
·Vol. 24
·期 3
·671-679
·
IF 2.062
Yan Yinglin,Li Qiaole,Ren Bing,Yang Rong,Xu Yunhua,Zhong Lisheng,Wu Hong
Hierarchical lithium iron phosphate/carbon (LiFePO 4 /C) microspheres were fabricated successfully using a facile spray drying-assisted coprecipitation method. A relatively short calcination time and a relatively low calcination temperature were adopted to prepare the hierarchical LiFePO 4 /C microspheres. The hierarchical microspheres consisted of nanoparticles with a uniform coating of amorphous carbon. The thickness of the carbon layer was controlled by the addition of glucose. The hierarchical LiFePO 4 /C microspheres exhibited a high tap density and a large specific surface area. The electrochemical properties of the sample were investigated. The sample exhibited a better rate capability and a better cyclability than the coral-like LiFePO 4 /C cathode material, and these were ascribed to the highly uniform carbon coating and the self-assembled nanoparticles.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Batteries & Supercaps
·
2020
·Vol. 3
·期 11
·1201-1208
·
IF 0
Yijian Liu,Hao Guo,Baohua Zhang,Gongyu Wen,Robert Vajtai,Ling Wu,Pulickel M. Ajayan,Liang Wang
Graphical A simple solution-based spray-drying method was successfully developed to prepare nitrogen-doped hollow porous carbon spheres (N-HPCS) using biomass lignin as a carbon precursor, cyanuric acid as an N dopant, and a porogen. The N-type doping in N-HPCS materials (especially pyrrolic-N) results in a strong Li 2 S x -N chemisorption force, which effectively suppresses the insolubility and “shuttle effect” of the infamous Li−S battery polysulfide. After 1000 cycles at 1 C, the low volume attenuation rate of each cycle is only 0.041 %. Exploring high-efficiency, long-term cycling stability, and cost-effective cathode materials for lithium-sulfur (Li−S) batteries is hugely desirable and challenging. Herein, we have successfully developed a simple solution-based spray-drying method to fabricate nitrogen-doped hollow porous carbon spheres (N-HPCS) with biomass lignin as a carbon precursor and cyanuric acid as a N-dopant and a porogen. The obtained N-HPCS shows a specific surface area of 446.2 m 2 g −1 and high-level pyrrolic-N doping of 64.13 %. The N-HPCS/S cathode has a high initial discharge capacity of 1535.1 and 1104.0 mA h g −1 at 0.1 and 1 C, respectively. In addition, the N-HPCS/S electrode exhibits outstanding cycle performance after 1000 cycles at 1 C, with a low capacity decay rate of only 0.041 % per cycle, which is superior to most of the recently reported carbon-based S cathodes. N-doping causes strong Li 2 S x −N chemical adhesion in carbon spheres, effectively suppressing the dissolution and “shuttle effect” of the notorious polysulfide of Li−S batteries, in which pyrrolic-N plays a leading role in the capture of polysulfides intermediates. This contribution is of great significance to the exploration of many other structure-property design strategies for ultralong cycle life Li−S energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
IONICS
·
2016
·Vol. 23
·期 2
·405-410
·
IF 2.119
Su Mingru,Liu Yunjian,Wan Huafeng,Dou Aichun,Wang Zhixing,Guo Huajun
The anode material Si/CNTs@C composite is prepared by a spray–drying combined pyrolysis technology. The as–prepared material is characterized by XRD, SEM, TEM, and electrochemical measurements. The composite is composed of nano–Si, CNTs, flake graphite, and amorphous glucose–pyrolyzed carbon, and CNTs provides a good wrapping effect to buffer the volume change of silicon. The composite as anode for LIB shows good electrochemical performance. In the voltage range of 2.00–0.01 V, it delivers initial charge capacity of 630.5 at 100 mA g −1 , and 85.14 % of initial capacity is retained even after 50 cycles. The CV and AC impedance analysis indicate that the prepared composite separately shows good electrode stability and low charge- transfer impedance R
ct . The results indicate that the Si/CNTs@C composite is a potential alternative to graphite for high energy–density lithium–ion batteries.
The anode material Si/CNTs@C composite is prepared by a spray–drying combined pyrolysis technology.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 9
·5638-5645
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IF 3.945
Rongting Guo,Wei Li,Mingjun Lu,Yiju Lv,Huiting Ai,Dan Sun,Zheng Liu,Guo-Cheng Han
The nano-scale spherical Na3V2(PO4)2F3 with a NASICON structure phase was prepared with a spray drying technique, and the bagasse in Guangxi, China was selected as the carbon source to prepare Na3V2(PO4)2F3/C. The optimal preparation conditions of the composite determined using thermogravimetry, X-ray diffraction, scanning electron microscopy and electrochemical testing were: a calcination temperature of 650 °C and a 20% carbon source. The Na3V2(PO4)2F3/C has obvious redox peaks, determined by cyclic voltammetry (CV), at 3.90 V and 3.75 V, 4.32 V and 4.15 V. These two pairs of redox peaks correspond to the escape/intercalation of the two pairs of Li+/Na+. Notably, compared with pure Na3V2(PO4)2F3, the specific discharge capacity of Na3V2(PO4)2F3/C-20%, which were used as a cathode material for lithium–sodium hybrid ion batteries, increased from 55 mA h g−1 to 125 mA h g−1, which was an improvement of twofold.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Qi Xia,Jinlong Hu,Qingqing Chen,Lingzhi Zhang
Selenium cathode attracts great attention due to its high theoretical volumetric capacity and better electrical conductivity than sulfur cathode. Herein, N/S co-doped microporous carbon (NS-K-PC) is designed and prepared as Se host by a spray drying process of the poly(styrenesulfonic acid)-melamine salt solution followed by carbonization and activation process. The as-prepared NS-K-PC shows a very high micropore contribution of 94.8% in the total surface area, and a total N/S heteroatom doping level of 2.5 wt% in the carbon matrix. The NS-K-PC/Se cathode delivers a high reversible capacity of 499.2 mA h g −1 at 0.1C, superior rate capacity of 324 mA h g −1 at 8C, and great cycling stability with a capacity decay of 0.081% per cycle over 500 cycles at 1C. Additionally, a comparative study demonstrates that NS-K-PC/Se cathode with the carbonate-based electrolytes exhibit better cycling stability than those with ether-based electrolytes primarily resulted from a direct solid–solid conversion of Se to Li 2 Se bypassing the formation of soluble polyselenides.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Bosheng Zhang,Panchao Zhao,Tianxing Wu
Design and fabrication of a non-Pt hydrogen evolution catalyst for acidic and alkaline solutions are of paramount significance for water splitting. Herein, we proposed a method through spray-drying coupling high-temperature reduction, which had simple, efficient, and wide-scale applications compared with the traditional synthetic process, and a RuCo NPs/CNTs hydrogen evolution catalyst was fabricated successfully. Zero-dimensional (0D) RuCo nanoparticles (<10 nm) embedded on one-dimensional (1D) CNTs uniformly and CNTs involving each other could offer numerous mass transfer pore canals and a large active specific surface area; on the other hand, Ru would possess an enhanced HER activity with the incorporation of Co for optimizing the adsorption energy of intermediates by the synergistic effect, which was verified through DFT calculation. Benefitting from the porous structure and metallic nanostructure, the RuCo NPs/CNTs-400 °C prepared in this paper showed excellent hydrogen evolution reaction (HER) performance, with low overpotentials of 39 and 27 mV at the current density of 10 mA·cm–2, small Tafel slopes of 32 and 27 mV·dec–1, and superior durability for 24 h in 0.5 M H2SO4 and 1.0 M KOH solutions, respectively. The proposed method in this paper may provide valuable strategies for developing varied catalysts for other catalysis fields.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）