ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Fengchun Li,Xin Gu,Shuang Wu,Sijin Dong,Juntao Wang,Pengcheng Dai,Liangjun Li,Dandan Liu,Mingbo Wu
Mn-based layered oxides exhibit high theoretical capacity and are environmentally friendly. However, the Mn 2+ dissolution and structural degradation during the cycling process result in performance decay. Herein, interface engineering using an artificial Al 2 O 3 coating layer was proposed to improve the performance of the K 0.5 MnO 2 material. This Al 2 O 3 protective layer acts as a barrier to avoid direct contact between the active material and the electrolyte, which could improve the Coulombic efficiency by inhibiting the side reactions, and boost the cycling stability via suppressing the Mn 2+ dissolution. In addition, the Al 2 O 3 coating layer modified K 0.5 MnO 2 electrode exhibits highly reversible structure evolution, which could be attributed to the mitigation of structural degradation. As a result, the K 0.5 MnO 2 @Al 2 O 3 cathode delivers a high capacity (95.3 mAh g ‒1 at 50 mA g ‒1 ) and long lifespan (53% capacity over 300 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 18
·5380
·
IF 3.623
Haichang Zhang,Zhibin Xu,Bin Shi,Fei Ding,Xingjiang Liu,Hongzhao Wu,Chunsheng Shi,Naiqin Zhao
Cr8O21can be used as the cathode material in all-solid-state batteries with high energy density due to its high reversible specific capacity and high potential plateau. However, the strong oxidation of Cr8O21leads to poor compatibility with polymer-based solid electrolytes. Herein, to improve the cycle performance of the battery, Al2O3atomic layer deposition (ALD) coating is applied on Cr8O21cathodes to modify the interface between the electrode and the electrolyte. X-ray photoelectron spectroscopy, scanning electron microscope, transmission electron microscope, and Fourier transform infrared spectroscopy, etc., are used to estimate the morphology of the ALD coating and the interface reaction mechanism. The electrochemical properties of the Cr8O21cathodes are investigated. The results show that the uniform and dense Al2O3layer not only prevents the polyethylene oxide from oxidization but also enhances the lithium-ion transport. The 12-ALD-cycle-coated electrode with approximately 4 nm Al2O3layer displays the optimal cycling performance, which delivers a high capacity of 260 mAh g−1for the 125th cycle at 0.1C with a discharge-specific energy of 630 Wh kg−1.Keywords:Cr8O21cathode material;atomic layer deposition;all-solid-state lithium-ion batteries;Al2O3coating
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
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Jingjing Ma,Chaoyang Cai,Jiawei Xie,Wenming Guo,Hang Qin,Jingxiong Liu,Wen Xie,Pengzhao Gao,Hanning Xiao
The low coefficient of thermal expansion (CTE) coating was designed for SiC oxidation-resistant applications by using Al 2 O 3 and LiAlSiO 4 as positive and negative expansion materials. The CTE value, relative density and flexural strength of LiAlSiO 4 -Al 2 O 3 coating were characterized. The effect of LiAlSiO 4 -Al 2 O 3 coating on the oxidation resistance and flexural strength of SiC substrate was systematically studied by cyclic oxidation tests at 1400 °C. Results showed that LiAlSiO 4 -Al 2 O 3 coating with 20 wt% LiAlSiO 4 exhibited optimal properties, featuring the excellent relative density of 93.14 %, appropriate CTE of 5.815 × 10 −6 /°C, and high flexural strength of 56.35 MPa. The weight gain of the SiC with LiAlSiO 4 -Al 2 O 3 coating was 0.49 % after 100 h of oxidation, much lower than 2.25 % of bare SiC substrate, indicating that LiAlSiO 4 -Al 2 O 3 coating effectively hindered the diffusion of oxygen and improved the oxidation resistance of SiC substrate. Moreover, the dense coating blunted defects on the SiC substrate surface, which maintained the high strength of the coated SiC after long periods of oxidation.
研究领域:
材料科学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Jiexin Jiao,Guoqing Xiao,Donghai Ding,Shaonan Liu,Li Zhang
In order to improve the mechanical properties of the SiO 2f /SiO 2 composites, the uniform and complete Al 2 O 3 coatings were prepared on the quartz fibers via sol–gel method with aluminum isopropoxide as the precursor. The thickness of Al 2 O 3 coatings increases with concentration of aluminum isopropoxide precursor solution. The Al 2 O 3 coatings fabricated with 10 wt.% precursor solution were uniform and complete, and its thickness was approximately 430 nm. The SiO 2f /SiO 2 composites with Al 2 O 3 coatings achieve higher mechanical strength compared with the SiO 2f /SiO 2 composites without Al 2 O 3 coatings. The flexural strength of SiO 2f /SiO 2 composites increases with concentration of aluminum isopropoxide precursor solution. And the compressive strength shows a slightly decreasing trend with concentration of aluminum isopropoxide precursor solution. The mechanical performance of the SiO 2f /SiO 2 composites fabricated from fibers coated with 10 wt.% aluminum isopropoxide precursor solution was excellent, and its compressive strength was 57.1 MPa, flexural strength was 28.6 MPa. And the reason was that the Al 2 O 3 coatings effectively enhanced the interface isolation between the fiber and the matrix, optimizes the deflection path of the crack and increased the strength of the SiO 2f /SiO 2 composites. The mechanical strength of SiO 2f /SiO 2 composites with Al 2 O 3 coatings was increased after not only short-term but also long-term heat treatment.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
·
2016
·Vol. 34
·期 4
·
IF 1.724
Duan Chen-Long,Deng Zhang,Cao Kun,Yin Hong-Feng,Shan Bin,Chen Rong
Iron(II,III) oxide (Fe 3 O 4 ) nanoparticles have shown great promise in many magnetic-related applications such as magnetic resonance imaging, hyperthermia treatment, and targeted drug delivery. Nevertheless, these nanoparticles are vulnerable to oxidation and magnetization loss under ambient conditions, and passivation is usually required for practical applications. In this work, a home-built rotating fluidized bed (RFB) atomic layer deposition (ALD) reactor was employed to form dense and uniform nanoscale Al 2 O 3 passivation layers on Fe 3 O 4 nanoparticles. The RFB reactor facilitated the precursor diffusion in the particle bed and intensified the dynamic dismantling of soft agglomerates, exposing every surface reactive site to precursor gases. With the aid of in situ mass spectroscopy, it was found that a thicker fluidization bed formed by larger amount of particles increased the residence time of precursors. The prolonged residence time allowed more thorough interactions between the particle surfaces and the precursor gas, resulting in an improvement of the precursor utilization from 78% to nearly 100%, even under a high precursor feeding rate. Uniform passivation layers around the magnetic cores were demonstrated by both transmission electron microscopy and the statistical analysis of Al mass concentrations. Individual particles were coated instead of the soft agglomerates, as was validated by the specific surface area analysis and particle size distribution. The results of thermogravimetric analysis suggested that 5 nm-thick ultrathin Al 2 O 3 coatings could effectively protect the Fe 3 O 4 nanoparticles from oxidation. The x-ray diffraction patterns also showed that the magnetic core crystallinity of such passivated nanoparticles could be well preserved under accelerated oxidation conditions. The precise thickness control via ALD maintained the saturation magnetization at 66.7 emu/g with a 5 nm-thick Al 2 O 3 passivation layer. This good preservation of the magnetic properties with superior oxidation resistance will be beneficial for practical magnetic-based applications.
研究领域:
材料科学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Lei Dai,Tingting Wang,Boxuan Jin,Na Liu,Yifei Niu,Wenhao Meng,Ziming Gao,Xianwen Wu,Ling Wang,Zhangxing He
Zinc is a widely used anode material for zinc-ion batteries. However, the problems of dendrites and side reactions faced by the metal zinc anode limit its cycle stability and service life. Surface modification is a simple and effective strategy for preparing high-performance anodes. Here, we used a simple method to coat the γ-Al 2 O 3 on surface of metal zinc as an artificial protective layer for the anode/electrolyte. γ-Al 2 O 3 coating can guide the uniform deposition of zinc ions . The coating has good hydrophilicity, which is conducive to accelerate ion transmission. In addition, the importance of controlling the thickness of protective layer on surface of zinc metal anode to obtain good electrochemical performance is emphasized. The appropriate thickness of Al 2 O 3 coating ensures the rapid migration of zinc ions and improves the uniformity of zinc plating/stripping, which is conducive to more uniform zinc nucleation and high-quality deposition. Therefore, the discharge capacity of Zn@Al 2 O 3 -15 full cell at a current density of 0.3 A g −1 is 174.3 mAh g −1 , which is much higher than that of bare zinc cell (71.8 mAh g −1 ). This work has certain reference significance for the development of anode coating strategies in zinc-ion batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 18
·8402-8407
·
IF 8.867
Zhongwen Fan,Zhe Xu,Shicheng Yan,Zhigang Zou
Inevitable surface defects on α-Fe2O3 photoanodes, a promising candidate for photoelectrochemical (PEC) water splitting with excellent stability and absorption in the visible light region, greatly limit their PEC performance for water oxidization. Surface modification is an effective strategy to decrease the negative effects of the surface defects. However, a challenge in understanding the nature of surface modification still remains. Here, we found that an ion-permeable Al2O3 coating layer can effectively prevent oxygen diffusion to the photoanode surface, thus suppressing the back reaction from oxygen reduction. The ion-permeable Al2O3 leads to ineffective surface state passivation due to the possible interface corrosion effect of OH− ions that decrease the interactions between Al2O3 and Fe2O3. In contrast, the ion-impermeable Al2O3 layer exhibits strong interactions with Fe2O3 and is mainly responsible for both surface state passivation and back reaction suppression, improving the photocurrent onset potential. Our results indicated that the modification of ion-impermeable passivation layers is a potential effective strategy to enhance the PEC performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhengfu Qiu,Shuai Yuan,Zhuyi Wang,Liyi Shi,Jae Hyeon Jo,Seung-Taek Myung,Jiefang Zhu
The separator, an essential component in lithium ion batteries , faces more challenges with the increasing diversification of electrode materials towards higher energy density and longer life. Herein we report the performance improvements of lithium ion batteries enabled by the multifunctional separator, which is fabricated by constructing the silica-oxygen-borate (Si–O–B) thin layer on Al 2 O 3 -coated polyethylene separators through surface engineering. This separator inherits the advantage of Al 2 O 3 -coated polyethylene separators in terms of excellent thermal stability and puncture strength , and no obvious dimensional change at 200 °C. The Si–O–B thin layer provides abundant Lewis acid sites and excellent electrolyte uptake to desolvate Li + ions and traps anions, and therefore favors excellent lithium ion transport properties and lithium/electrolyte interfacial stability. More importantly, the Si–O–B hybrid thin layer endows an additional function of scavenging HF and H 2 O molecules. The benefits offered by this separator are demonstrated by the enhanced C-rates capability and cycling performance of both LiCoO 2 /Li half-cell and NCM/graphite full cell, which lies far beyond those achievable with commercial polyethylene separators and Al 2 O 3 -coated polyethylene separators. This work presents a simple and efficient strategy to construct multifunctional separators with excellent comprehensive properties, and provides inspiration for the rational design of advanced separators towards next-generation high-performance batteries .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Shaoqing Wang,Xiangqing Wu,Faqin Xie,Jiayu He,Hao Yu
The innovative work presented in the paper focused on microstructures and wear performance of MoS 2 doped Al 2 O 3 coatings on TC6 alloy. Nano- and micron-sized MoS 2 particles doped Al 2 O 3 coatings (n and m-MoS 2 /Al 2 O 3 coating) were fabricated on TC6 alloy via cathodic plasma electrolytic deposition (CPED) technique. The microstructures and compositions of the coatings were characterized, the tribological behaviors were tested, and doping mechanism of MoS 2 particles was discussed. The results showed that, doped coatings were composed of α -Al 2 O 3 , γ -Al 2 O 3 and MoS 2 . The doping of MoS 2 particles promoted the transformation from γ -Al 2 O 3 to α -Al 2 O 3 during CPED process , and increased the compactness and crystallinity of doped coatings. The friction coefficients of TC6 alloy, Al 2 O 3 coating, n-MoS 2 /Al 2 O 3 coating and m-MoS 2 /Al 2 O 3 coating were about 0.7, 0.6, 0.55 and 0.45 in sequence, and the wear rates of n-MoS 2 /Al 2 O 3 coating and m-MoS 2 /Al 2 O 3 coating were about 75 % and 58 % of Al 2 O 3 coating. MoS 2 particles played the role of lubrication and contributed to improving wear performance of doped coatings, both friction coefficients and wear rates were declined, and micron-sized MoS 2 particles presented better wear performance than nano-sized particles.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Chenxu Liu,Shuguang Zhang,Ruonan Ji,Peng Wang,Jin Zhang,Yu Tian,Yonggang Meng,Yedong He
Semiconductor particles doped Al 2 O 3 coatings were prepared by cathode plasma electrolytic deposition in Al(NO 3 ) 3 electrolyte dispersed with SiC micro- and nano-particles (average particle sizes of 0.5–1.7 µm and 40 nm respectively). The effects of the concentrations and particle sizes of the SiC on the microstructures and tribological performances of the composite coatings were studied. In comparison with the case of dispersing with SiC microparticles, the dispersion of SiC nanoparticles in the coatings was more uniform. When the concentration of SiC nanoparticles was 5 g/L, the surface roughness of the composite coating was reduced by 63%, compared with that of the unmodified coating. Friction results demonstrated that the addition of 5 g/L SiC nanoparticles reduced the friction coefficient from 0.60 to 0.38 and decreased the wear volume under dry friction . The current density and bath voltage were measured to analyze the effects of SiC particles on the deposition process. The results showed that the SiC particles could alter the electrical behavior of the coatings during the deposition process, weaken the bombardment of the plasma, and improve the structures of the coatings.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Qian Qi,Yan Liu,Hui Zhang,Yinsheng Li,Hanqin Liang,Zhengren Huang
SiC p /Hastelloy composites were fabricated by pressureless Ti-activated infiltration process. The wetting and infiltration behaviors of Hastelloy on the SiC substrates and the interfacial reaction between the SiC particles and Hastelloy were investigated by real-time observation system, X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy X-ray dispersive spectroscopy (EDS) system. The results demonstrated that the Hastelloy had a good wettability on SiC ceramic and could spontaneously infiltrate into the Ti-activated SiC preform. Moreover, intensive interfacial reaction similar to SiC/Ni system was found between the SiC particles and Hastelloy, which induced defects in the microstructure. In order to inhibit the interfacial reaction, Al 2 O 3 coating on SiC particles was adopted as a diffusion barrier, which effectively reduced the extent of the interfacial reactions.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Wang Xinzhi,Jiang Qianqian,Zhang Yichi,Yuan Nannan,Tang Jianguo
PLA-1-Al2O3@LNCM synthesized using an efficient and facile plasma-enhanced method exhibits markedly improved capacity retention of 98.6% after 100 cycles, which is much larger than that of LNCM at 80% after 100 cycles. What is more, it also exhibits significantly enhanced cyclicity compared to that of 1-Al2O3@LNCM cathodes prepared using the normal solid state method, which further illustrates the efficiency and superiority of this plasma-enhanced method. More importantly, the rate performance of PLA-1-Al2O3@LNCM is improved because of the better electrolyte storage of the assembled hierarchical architecture of the Al2O3 coating layer according to unimpeded Li+ diffusion from electrode to electrolyte. When cycling at 55°C, the PLA-1-Al2O3@LNCM shows 93.6% capacity retention after 100 cycles, which is greatly enhanced due to the uniform Al2O3 layer. Further, growth of polarization impedance during cycling can be effectively suppressed by the Al2O3 layer, which can further confirm the effect the Al2O3 layer coated on the surface of the LNCM. The enhanced cycling performance and thermal stability illustrates that this facile surface modification, using the plasma-enhanced method, can form an effective structured coating layer, which indicates its prospects as an application in the modification of other electrode materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）