DESALINATION
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2024
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IF 8.3
Hui Yang,Baozhong Ma,Shuyang Shi,Qinqing Zhao,Chengyan Wang,Yongqiang Chen
The continuous development of lithium-ion batteries (LIBs) manufacturing industry calls for the mass production of Li 2 CO 3 , which serves as a pivotal raw material for LIBs. In our previous study, Li was successfully precipitated as intermediate product Li 2 SiO 3 from an alkaline solution containing Si by the hydrothermal precipitation method, realizing the preliminary separation of Li and impurities. In this research, H 2 SO 4 digestion-water leaching-Na 2 CO 3 precipitation process was proposed to manufacture Li 2 CO 3 from the intermediate product Li 2 SiO 3 . Firstly, the reaction feasibility of H 2 SO 4 digestion-water leaching and direct H 2 SO 4 leaching for Li 2 SiO 3 were comparatively evaluated through thermodynamic calculation and experimental research. Compared to direct H 2 SO 4 leaching, H 2 SO 4 digestion-water leaching process is preferred in view of its excellent filtration properties. Subsequently, systematic digestion and leaching experiments showed that up to 97.1 % of Li was extracted under the optimized conditions, and the concentration of Li in the leach liquor is as high as 29.33 g/L. After pH adjustment and Al removal, Na 2 CO 3 precipitation were adopted for Li 2 CO 3 production. The equilibrium relationship in Li 2 SO 4 -Na 2 CO 3 -H 2 O system was analyzed to predict the precipitation behavior of Li and select appropriate operation window for Li 2 CO 3 preparation. Finally, with an additional carbonation-decomposition process, a Li 2 CO 3 product with a purity of 99.51 % is produced. This process realizes efficient synthesis of battery-grade Li 2 CO 3 from the intermediate product Li 2 SiO 3 .
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
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Yichao Gong,Jiarui Li,Lin Liu,Zhaokun Li,Longchao Zhuo,Guojun Zhang
Multiphase composites of lithium ceramics have emerged as a prominent area of research in the development of advanced solid tritium breeding materials. In this study, Li 2 TiO 3 /Li 2 SiO 3 co-doped Li 4 SiO 4 ceramic pebbles were prepared through an in-situ reaction between Li 4 SiO 4 and TiO 2 . The objective of this study is to enhance the thermal cycling stability of Li 4 SiO 4 by impeding the grain boundary migration of Li 4 SiO 4 under high temperature conditions. The effects of the in-situ generated Li 2 TiO 3 /Li 2 SiO 3 particles on the microstructure, crush load and thermal cycling stability of Li 4 SiO 4 ceramic pebbles were investigated. The in-situ formed Li 2 TiO 3 and Li 2 SiO 3 particles effectively hindered the grain growth and minimized the formation of large intracrystalline pores in Li 4 SiO 4 . At a sintering temperature of 900 °C, the Li 2 TiO 3 /Li 2 SiO 3 particles are beneficial in increasing the crush load of Li 4 SiO 4 ceramic. However, at lower sintering temperatures, their impact was counterproductive. An increase in the volume fractions of the Li 2 TiO 3 /Li 2 SiO 3 had a positive effect on grain refinement but a negative effect on crush load. The Li 2 TiO 3 /Li 2 SiO 3 co-doped Li 4 SiO 4 ceramic pebbles exhibited excellent structural stability during thermal cycling. The optimum mechanical stability was achieved at a TiO 2 addition of y = 0.1. The in-situ generated fine second phase particles effectively impeded grain boundary migration at high temperatures, providing a viable strategy for improving the thermal stability of Li 4 SiO 4 tritium breeders.
研究领域:
材料科学
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核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Zongbao Zhang,Lai Xie,Ruikun Lin,Qiqi Qin,Yangyang Cai,Yang Zhou,Hui Liu,Xubing Lu,Xingsen Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
Planar perovskite solar cells based on Li 2 SiO 3 modified TiO 2 electron transport layer are fabricated by one-step method. Here the Li 2 SiO 3 modified TiO 2 films are prepared by a simple soaking process at 65 °C. The effect of Li 2 SiO 3 modification on the photoelectric properties of TiO 2 films and devices has been systematically investigated. Compared to the reference TiO 2 , the modified TiO 2 demonstrates better characteristics such as better surface wetting properties of perovskite precursor, enhanced electron mobility and reduced electron trap state density, which contribute to the favorable photovoltaic performance . At the optimized process , the device based on the modified TiO 2 film yields a champion power conversion efficiency of 18.67%, being much higher than 14.78% of the reference device. The improved performance is primarily attributed to the promoted charge transport and reduced charge recombination in the modified electron transport layer. This work provides a simple route to obtain efficient planar perovskite solar cells by low-temperature process, which will be compatible with flexible plastic substrates in future practical applications.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Jiale Fu,Daobin Mu,Borong Wu,Jiaying Bi,Xiaojiang Liu,Yiyuan Peng,Yiqing Li,Feng Wu
Developing high-voltage Li ion batteries (LIBs) is an important trend to meet the requirement of high energy density battery . However, high voltage will cause a series of problems harming the cycle performance of LIBs at the same time. This work is to investigate the effect of inorganic substance Li 2 SiO 3 on the electrochemical performance of LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) cathode at high cutoff voltage of 4.6 V. XRD result shows that the structure of NCM622 cathode material is not affected by mixing Li 2 SiO 3 . However, XPS and EIS tests indicate that Li 2 SiO 3 has an evident influence on suppressing the decomposition of LiPF 6 and carbonate solvents at high voltage, reducing interfacial solid film impedance and modifying electrode/electrolyte interface. In addition, Li 2 SiO 3 retards the transition metal dissolution by consuming HF. Therefore, it enhances the electrochemical properties of the NCM622 cathode significantly. The highest discharge capacity increases to 191.7 mA h g -1 by mixing Li 2 SiO 3 , compared with the value of 180 mA h g -1 in the case of NCM622 cathode. The NCM622 electrode mixed with Li 2 SiO 3 also exhibits a better capacity retention of 73.4% after 200 cycles and a high rate capability at 20C with the value of 89 mA h g -1 , in contrast with 62.2% and 31 mA h g -1 attained in the NCM622 cathode.
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
Journal of Cleaner Production
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2023
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IF 11.1
Hui Yang,Shuang Shao,Baozhong Ma,Yingwei Lv,Yongqiang Chen,Chengyan Wang
With the increasingly essential role of Li in new energy industry, Li extraction from ore has attracted active attention. In the prior study, a process combined thermal activation and alkali leaching was proposed to extract Li from Li concentrate. Previous research found that Li was precipitated as Li 2 SiO 3 and entered into the leach residue at the leaching temperature exceeded 100 °C. Drawing inspiration from this phenomenon, hydrothermal precipitation of Li as intermediate product Li 2 SiO 3 from the alkali leach liquor of Li concentrate was proposed. Firstly, the E–pH diagrams of Li–Si–H 2 O system were plotted to analyze the feasibility of hydrothermal precipitation Li. And the corresponding operation window was established. Subsequently, the effect of factors including Li/Si ratio, hydrothermal temperature and time, Li and NaOH concentrations on the migration behaviors of Li and Si were explored using the simulated leach liquor. The experimental results were in good consistence with the thermodynamic analysis. Ultimately, the leach liquor was used to precipitate Li at the determined optimal conditions, and the Li precipitation efficiency reached 91.0%. This study provided an innovative strategy for separating Li from the alkali leach liquor of Li concentrate without adding any reagents. An economical and sustainable route for synergistic extraction of Li, Rb, and Cs from Li concentrate was also proposed.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingsheng Xu,Zhiyuan Wang,Runguo Zheng,Hongyu Sun,Yanguo Liu,Junhua You
Ni-rich cathodes especially with Ni content over 90 % are promising next-generation cathode materials for advanced high energy lithium − ion batteries. However, in comparison with Ni ≤ 80 % Ni-rich cathodes, these ultrahigh Ni-rich materials face more severe challenges in terms of harmful H2 − H3 phase transformations and structural degradation during cycling. Herein, we present a robust surface structure composted of defect-rich disordered structures and LiF/Li 2 SiO 3 coating for stabilizing the ultrahigh Ni-rich cathode LiNi 0.96 Co 0.03 Mn 0.01 O 2 (NCM96) by modification with (NH 4 ) 2 SiF 6 . The surface disordered structures including Li/TM mixing, spinel, and rock salt structure play a crucial role in inhibiting the irreversible H2-H3 phase transition and reducing lattice volume changes by lattice coherence effect. Moreover, the disordered surface in collaboration with the co-coating restrains the rapid growth of surface rock salt phase into the bulk, enhancing structural stability. The modified sample NSF-0.5 delivers a capacity of 238 mAh/g at 0.1C and maintains a capacity retention of 88.5 % at 0.5C after 100 cycles in half cell as well as 82.3 % at 1C after 300 cycles in full cell, significantly superior to the NCM96. The findings provide a simple and cost-effective surface modification strategy to enhance the structural stability and electrochemical performance of ultrahigh nickel cathodes for high-energy density LIBs.
研究领域:
材料科学
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电化学
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能源存储
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锂离子电池
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固态化学
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表面工程
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电池材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）