CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Linkai Ren,Quanxing Ren,Ziqiang Yin,Tihao Cao,Xuxin Ping,Fangfang Ge,Zhengren Huang,Qing Huang,Yinsheng Li
In order to achieve low-temperature densification of SiC ceramic, β-SiC nanopowder was doped with Li 2 O together with Y 2 O 3 –Al 2 O 3 –MgO as sintering aids, and then spark plasma sintered at temperatures ranging from 1450 °C to 1600 °C for 30 min under 30 MPa pressure in argon. The densities, microstructures and mechanical properties of SiC ceramics were systematically investigated, in comparison to the counterparts sintered with Y 2 O 3 –Al 2 O 3 –MgO additives. Since Li 2 O has a low melting point, Li 2 O addition effectively decreased the formation temperature of liquid secondary phase, enabling SiC ceramics to obtain higher density and lower porosity after low-temperature sintering (T ≤ 1550 °C). Besides, Li 2 O addition was found to decrease the viscosity of liquid phase and enhance grain growth of SiC through dissolution-reprecipitation process. When sintered at 1550 °C, Li 2 O addition led to a remarkable increase of density from 3.03 g/cm 3 to 3.21 g/cm 3 for SiC ceramic. Meanwhile, the SiC ceramic with Li 2 O addition exhibited a high Vickers hardness of 22.75 ± 0.35 GPa and a good fracture toughness of 3.83 ± 0.27 MPa m 1/2 . The research results are expected to benefit the low-cost fabrication of SiC ceramics based on pressure-assisted sintering and alleviate the thermal damage of SiC fiber in hot-pressed SiC f /SiC composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 8
·082512
·
IF 4.316
Nan Ji,Tiejian Zhu,Hao Peng,Feng Jiang,Wei Huang,Yu Gong
In the common spent fuels, actinides and fission products are generally in the form of oxide, so direct dealing with oxide will be the most convenient way for spent fuel reprocessing. In this work, the electrolytic reduction of Gd2O3 has been studied in LiCl-KCl-Li2O (1 wt%) melts at different conditions, and the effect of sintering temperature on the porosity of Gd2O3 powder and the electrochemical behavior of Li2O in LiCl-KCl molten salt were investigated, too. The diffusion coefficient of O2− was calculated to be 2.0 × 10−5 cm2·s−1 in LiCl-KCl melts on the Mo electrode at 923 K by cyclic voltammetry (CV). The electrode process of Gd2O3 powder was also analyzed in LiCl-KCl-Li2O (1 wt%) melts, and the formation process of composite oxide LiGdO2 was determined. By the analysis of XRD and oxygen content characterization, it was suggested that after 74 h electrolysis (923 K, 3.40 V), the oxygen content of Gd2O3 cathode decreased from 12.25 wt% to 1.41 wt%, indicating 88.5% Gd2O3 was reduced to metal.
研究领域:
核化学与核燃料循环
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电化学
✓ 已验证
DOI
高影响因子
JOM
·
2015
·Vol. 68
·期 9
·2371-2380
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IF 1.757
Lai Huixian,Huang Liuqing,Lu Chenghao,Fang Ming,Ma Wenhui,Xing Pengfei,Li Jintang,Luo Xuetao
Boron removal from metallurgical-grade silicon by Li 2 O-SiO 2 slag refining under an air atmosphere was experimentally investigated to explore the potential of this method for achieving high boron removal. The boron concentration in the refined silicon was studied under different conditions of holding time, slag composition, and mass ratio of slag to silicon. The boron concentration in metallurgical-grade silicon was successfully reduced from 8.6 ppmw to 0.4 ppmw after slag refining for 0.5 h at 1973 K when the mass ratio of the 60 wt.% Li 2 O-40 wt.% SiO 2 slag to metallurgical-grade silicon was 3. It was proposed that the addition of CaF 2 decreased the activity of silica, which brings about a negative effect on the boron removal capacity of Li 2 O-SiO 2 slags. Moreover, the reaction mechanism and kinetics of boron removal were further studied. Analysis of the boron concentration in the resulting slag after refining revealed that the primary boron removal approach was that a large amount of boron was oxidized and then volatilized to the atmosphere in the form of gaseous borates. Based on the two-film theory, the total mass transfer coefficient of boron was determined to be 2.3 × 10 −2 μ m/s.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 7
·2919-2928
·
IF 1.754
Jiang Yuqi,Gao Shuaibo,Li Peng,Ma Yongsong,Yin Huayi,Wang Dihua
The waste LiCl–Li 2 O oxide reduction salt was solidified and transformed into sodalite by the spark plasma sintering method. Compared with traditional solidification method, SPS operates at a lower pressure, lower temperature, shorter processing time, and without sintering additive. The SPS-solidified sodalite presents a low porosity of 0.37% and low leaching rates of 2.21 g m –2 d –1 for Cs, 3.05 × 10 –1 g m –2 d –1 for Ba, and 3.12 × 10 –1 g m –2 d –1 for Sr. Overall, the SPS is a promising method to solidify various waste OR salts.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Ruichong Chen,Mao Yang,Yanli Shi,Hailiang Wang,Hao Guo,Yuanyuan Zeng,Jianqi Qi,Qiwu Shi,Zhijun Liao,Tiecheng Lu
In this study, Li 2 O porous ceramic pebbles were synthesized by decomposing the xLi 2 CO 3 -yLiNO 3 precursor pebbles at low temperature. This efficient decomposition reaction was mainly attributed to the two-stage support decomposition of Li 2 CO 3 and LiNO 3 . The results indicated that the molar ratio of Li 2 CO 3 and LiNO 3 will directly affect the phase composition , pore structure and crush load of sintered pebbles. The high-purity Li 2 O ceramic pebbles sintered from Li 2 CO 3 –LiNO 3 precursor pebbles at 730 °C exhibits the open porosity of 24.8 ± 0.7%. The crush load of the ceramic reaches 21.18 ± 1.38 N although the structure was porous. The Li 2 O porous ceramics fabricated in this study will have potential application in tritium breeder materials.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Fei Zhu,Zekai Zhang,Jie Gu,Jinting Xu,Sukum Eitssayeam,Qunjie Xu,PengHui Shi,YuLin Min
Lithium metal batteries have garnered significant attention as a promising energy storage technology, offering high energy density and potential applications across various industries. However, the formation of lithium dendrites during battery cycling poses a considerable challenge, leading to performance degradation and safety hazards. This study aims to address this issue by investigating the effectiveness of a protective layer on the lithium metal surface in inhibiting dendrite growth. The hypothesis is that continuous lithium consumption during battery cycling is a primary contributor to dendrite formation. To test this hypothesis, a protective layer of Li 3 Bi/Li 2 O was applied to the lithium foil through immersion in a BiN 3 O 9 solution. Experimental techniques including kelvin probe force microscopy (KPFM) and density functional theory (DFT) calculations were employed to analyze the structural and electronic properties of the Li 3 Bi/Li 2 O layer. The findings demonstrate successful doping of Bi into the Li coating, forming Bi-Bi and Bi-O bonds. KPFM measurements reveal a higher work function of Li 3 Bi/Li 2 O, indicating its potential as an effective protective layer. DFT calculations further support this observation by revealing a greater adsorption energy of lithium on the Li 3 Bi/Li 2 O layer compared to the bulk material. Charge density analysis suggests that the adsorption of Li atoms onto the Li 3 Bi/Li 2 O layer induces a redistribution of charge, resulting in increased electron availability on the surface and preventing electrode–electrolyte contact. This study provides insights into the role of the Li 3 Bi/Li 2 O protective layer in inhibiting dendrite growth in lithium metal batteries. By mitigating dendrite formation, the protective layer holds promise for enhancing battery performance and longevity. These findings contribute to the development of strategies for improving the stability and reliability of lithium metal batteries, facilitating their wider adoption in energy storage applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Tianyu Zhu,Cuiping Yu,Yang Li,Rui Cai,Jiewu Cui,Hongmei Zheng,Dong Chen,Yong Zhang,Yucheng Wu,Yan Wang
Li 2 O-2B 2 O 3 (LBO) ionic conductor with high conductivity plays an important role in boosting the rate performance and cycling stability of Li 4 Ti 5 O 12 (LTO) anode for lithium-ion batteries by preventing direct exposure of LTO to the electrolyte. Herein, the effect of LBO coating layer on lithium ion (Li + ) storage performance is investigated in detail by adjusting the adding amount of LBO precursor dispersion. LTO coated with 2 wt% LBO achieves an optimum performance with a specific capacity of 172.9 mA h g −1 at a current density of 0.1 A g −1 , an improved rate capability (specific capacity of 127.9 mA h g −1 is maintained when the current density is 20 times than 0.1 A g −1 ) and a remarkable cycling stability (capacity retention of 94.2% after 4000 cycles at 2.0 A g −1 ). These LBO-LTO composites are competitive and promising candidates for electrochemical energy storage and other applications.
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 THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 10
·5612-5623
·
IF 3.502
Ruichong Chen,Jianqi Qi,Qiwu Shi,Yanli Shi,Hailiang Wang,Hao Guo,Yuanyuan Zeng,Mao Yang,Zhijun Liao,Tiecheng Lu
This paper gives an oil-based granulation approach to realize the efficient preparation of Li 2 O breeder materials, which solve the problems of long preparation cycle, high manufacturing cost and difficult to be homogenization and densification in the past. Li 2 O precursor spheres with narrow size distribution and uniform spherical shape can be obtained using paraffin oil as binders. The Li 2 O feed powder with bimodal size distribution will self-organize to form a core-shell structured sphere during granulation, in which the core and shell are composed of small particles and large particles, respectively. Notably, the Li 2 O ceramic spheres sintered at 900°C can achieve a crush load of 40.69 ± 4.01 N and a theoretical density of 79.66% TD, which was not achievable by the methods reported in the previous literature. The strategy proposed in this work not only can be easily extended to other material systems but also opens up a new avenue for the design and preparation of tritium breeder materials with uniform size distribution and satisfactory mechanical properties.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Advances
·
2023
·Vol. 2
·期 10
·1685-1692
·
IF 0
Guozhe Ma,Yu Zheng,Fanbo Meng,Renzong Hu
High-entropy oxides (HEOs) have started to attract widespread interest as anode materials for lithium-ion batteries (LIBs), because of their high theoretical discharge capacities, fast ionic conductivity, and stable structure caused by the unique entropy stabilization effect and the “cocktail” effect. However, the lithiation mechanism of HEO anode is still conversional, which prevents its further development. Herein, we propose an Li2O-doping strategy for improving the lithium storage ability of HEO anodes. Li2O is successfully introduced into the spinel high-entropy oxide to obtain a (FeMgNiCrMnLi)3O4 anode (Li-SHEO) via a solution combustion synthesis and ball milling method. Experimental results show Li doping would induce the growth of oxygen vacancies and regulate the conversion reactions during the discharge process, leading to improved electrochemical performance. As a result, the lithiation process of an Li-SHEO anode includes an enhanced Li+ ion intercalation process and a typical conversion reaction. Compared with the (FeMgNiCrMnLi)3O4 (SHEO) anode, the Li-SHEO anode shows a high reversible discharge capacity of 850.7 mA h g−1 after 200 cycles under a large current density of 2.0 A g−1.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
Energy Storage Materials
·
2022
·
IF 20.831
Jie Shi,Ping Li,Kun Han,Dong Sun,Wang Zhao,Zhiwei Liu,Gemeng Liang,Kenneth Davey,Zaiping Guo,Xuanhui Qu
Sulfide electrolytes (SEs)-based all-solid-state lithium batteries (ASSLBs) are advantageous over traditional lithium-ion batteries (LIBs) because of high energy density and safety. Unfortunately, the commercialization of SEs-based ASSLBs is presently hindered by interfacial instability between SEs and active materials, sluggish dynamics and poor cycling performance. Here we report, for the first time, a stable and conductive Li 2 O buffering coating for Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) in ASSLBs using SEs of Li 6 PS 5 Cl via a facile one-step sintering. We show using judiciously combined computation and experiment that Li 2 O buffering improves the stability of NCM811 and significantly boosts transfer of Li + . Via tuning the thickness of the Li 2 O buffer, we demonstrate the high initial discharge capacity of 189.66 mAh g − 1 (0.1C) and rate capability of 61.71 mAh g − 1 (3C), together with outstanding long-term cycling performance of ∼ 2600 cycles at 1C with capacity retention of 81.47%, and Coulombic efficiency of 99.9%. We conclude that conductive Li 2 O buffering can be used to obviate interfacial instability between SEs and active materials and to boost dynamics and cycling performance. Findings will be of immediate benefit to a range of researchers in design for high-performance ASSLBs for practical application and commercialization.
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
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jusheng Zheng,Kui Liang,Kaiyue Shi,Yechao Qiu
The irreversible capacity loss in the first cycle significantly reduces the specific capacity of lithium ion batteries. Cathode prelithiation is a common method to alleviate this problem. Here, Fe/Li2O were successfully prepared by in situ solid phase reaction method. Fe/Li2O as a cathode prelithiation additive has a high prelithiation specific capacity of 447.3 mAh g -1 during charging, and the first charge capacity of LiNi0.6Co0.2Mn0.2O2 with 7.5% Fe/Li2O additive could be enhanced by 9.1% and its cycling stability was improved from 86.9% to 90.2% after 70 cycles. The cathode prelithiation additive remarkably enhanced the content of active lithium during the initial delithiation process, contributing the formation of solid electrolyte interphase on the anode surface and better cycling stability. This easy-operating cathode prelithiation method could obtain evident effect of prelithiation and had good compatibility with existing lithium ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Weidong Sang,Xuefeng Yang,Haitao Tian,Jialin Wang,Yuchang Wang,Zhengxin Li
During the process of sintering diamond/ceramic composites, the wettability between diamond and the ceramic matrix is poor, and there are many irregular pores in the composites, which leads a low bending strength of the composites and easy shedding of diamond. In order to solve these problems, SiO 2 -B 2 O 3 -Li 2 O-ZnO-Al 2 O 3 glass-ceramic coated diamond was prepared by a sol-gel method, and the properties of the coated diamond abrasive particles were studied. The SBLZA glass-ceramic-coated diamond exhibited high thermal stability and excellent oxidation resistance, making it a good protective material for diamond. The oxidation resistance of the SBLZA glass-ceramic-coated diamond was determined by thermogravimetric analysis (TGA). The uncoated diamond abrasive particles began to oxidize at 723 °C, while the coated abrasive particles were resistant to oxidation at temperatures up to 1000 °C. The glass-ceramic coating significantly improved the bonding between diamond and the ceramic matrix. The use of SBLZA glass-ceramic-coated diamond instead of uncoated diamond in the composites sintered at 750 °C resulted in a decrease in the volume expansion rate of the diamond/ceramic composites from 37.2 % to 28.5 %, and an increase in the bending strength from 38.4 MPa to 61.5 MPa.
研究领域:
材料科学
·
涂层技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）