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
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2015
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IF 6.723
Yonghuan Ren,Daobin Mu,Feng Wu,Borong Wu
We report a novel slurry electrolyte with ultrahigh concentration of insoluble inorganic lithium metasilicate (Li2SiO3) that is exploited for lithium ion batteries to combine the merits of solid and liquid electrolytes. The safety, conductivity, and anodic and storage stabilities of the eletrolyte are examined, which are all enhanced compared to a base carbonate electrolyte. The compatibility of the elecrolyte with a LiNi0.5Mn1.5O4 cathode is evaluated under high voltage. A discharge capacity of 173.8 mAh g–1 is still maintained after 120 cycles, whereas it is only 74.9 mAh g–1 in the base electrolyte. Additionally, the rate capability of the LiNi0.5Mn1.5O4 cathode is also improved with reduced electrode polarization. TEM measurements indicate that the electrode interface is modified by Li2SiO3 with a thinner solid electrolyte interphase film. Density functional theory computations demonstrate that LiPF6 is stabilized against its decomposition by Li2SiO3. A possible path for the reaction between PF5 and Li2SiO3 is also proposed by deducing the transition states involved in the process using the DFT method.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Chunlin Wu,Ziqing Wang,Zhong Wei,Dexing Li,Zhili Yin,Qin Wu,Shihan Chen,Yuqiao Gan,Mengru Lian,Zongyuan Wang
The by-product silicon tetrachloride (SiCl 4 ) from the polysilicon industry was recycled to fabricate a highly efficient and stable lithium silicate (LS) catalyst for upgrading of oversupplied biodiesel by-product glycerol to valuable glycerol carbonate (GC). The characteristics of the LS catalyst were systematically investigated by various experimental characterization techniques and density functional theory (DFT) calculations. The experimental results showed that the hydrolysis of SiCl 4 in the lithium nitrate solution helping to the solid phase synthesis of the LS catalyst as lithium could be uniformly dispersed in the silica gel. The as-synthesized LS catalyst mainly consists of lithium orthosilicate with strong basic sties, favoring the catalytic conversion of glycerol. The LS catalyst exhibited an appreciably high catalytic efficiency (turnover frequency of 2.72 min −1 ) and glycerol conversion (99.8±1.8 %) compared to other reported solid base catalysts. The apparent activation energy ( E a ) of this reaction was calculated to be 39.51 kJ/mol. Further, benefiting from the stable silicate structure, the LS catalyst showed an enhanced catalytic stability as the glycerol conversion declined less than 5 % after five times reuse without regeneration. The LS catalyst also revealed marked resistance to the solid base catalyst poisons like water and methanol compare to that of commercial calcium-based catalyst. The temperature-programmed desorption of CO 2 (CO 2 -TPD) and DFT results affirmed that the low-coordination lattice oxygen of the isolated SiO 4 tetrahedron on the surface of the LS catalyst acting as a strong basic electron donor promoted the transesterification reaction between DMC and glycerol. As a result, the SiCl 4 -derived LS catalyst possessed remarkable catalytic efficiency and reusability, which could be an ideal candidate to meet the requirements for industrial application and highlight the potential application of the by-product SiCl 4 .
研究领域:
化学工程
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材料科学
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能源技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 45
·23844-23850
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IF 11.301
Mengmin Jia,Yawei Guo,Haiyan Bian,Qipeng Zhang,Lan Zhang,Suojiang Zhang
Lithium metal batteries (LMB) are one of the most attractive candidates for next generation high energy density devices owing to the high specific capacity (3860 mA h g−1) and low electrochemical potential (−3.04 V vs. standard hydrogen electrode) of the lithium metal anode. However, a series of problems, especially lithium dendrite growth, hinder its commercial application and these issues are more prominent under extreme conditions. In this work, a novel nanostructured macromolecular lithium salt (LiMS) electrolyte additive, polyethylene glycol (PEG) tethered to partially lithiated SiO2 nanoparticles, is designed and synthesized. This organic–inorganic hybrid nanosized additive can not only serve as a flexible physical barrier between the Li/electrolyte interphase and provide extra Li+, but also absorb HF through some of its functional groups, thereby reducing the parasitic reactions that take place at high temperatures. Facilitated by the nanoscale protective layer formed by the LiMS additive, the Li‖Li4Ti5O12 battery demonstrates outstanding electrochemical performance within the wide temperature range of −20 to 60 °C. More than 70% of its theoretical capacity is delivered at −20 °C and 0.5C rate; 80.23% capacity is retained after 200 cycles under a critical condition of 5C and 60 °C. Moreover, the LiMS additive also improves the compatibility between the electrolyte and LiNi0.8Co0.1Mn0.1O2, thus demonstrating its potential for wide applications.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
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2017
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IF 2.236
Zhongyun Zhou,Ke Wang,Zeguang Yin,Pengfei Zhao,Zhen Su,Ji Sun
Highly efficient K 2 CO 3 -doped lithium orthosilicate (Li 4 SiO 4 ) sorbents were synthesized using acid treatment to overcome the typical kinetic limitations of sorbents at low CO 2 concentrations. The effects of K 2 CO 3 on the structure and absorption properties were characterized using various morphological characterization techniques, differential scanning calorimetry (DSC) and thermogravimetric analysis (dynamic and isothermal). The results showed that different amounts of K 2 CO 3 greatly affected the physical-chemical properties and absorption kinetics of the sorbents. On one hand, K 2 CO 3 formed a solid solution with Li 4 SiO 4 and generated favorable characteristics (a smaller crystal size, corrugated morphology, larger surface area and higher surface concentration of Li 2 O), significantly facilitating the chemisorption processes. On the other hand, a higher amount of doped K 2 CO 3 was located on the surface, which induced molten phases during CO 2 absorption, remarkably decreasing the diffusion processes. Therefore, 0.1 M K 2 CO 3 doped sorbent obtained noticeable absorption capacity and good regenerability in 15 vol.% CO 2 .
研究领域:
材料科学
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环境化学
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能源工程
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无机化学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Shengjie Liu,Hao Wu,Ling Huang,Mingwu Xiang,Heng Liu,Yun Zhang
Ni-rich ternary layered oxides , (LiNi x [M] 1−x O 2 , x ≥ 0.5, M = Co and Mn), have become one of the mainstream cathode materials for next-generation lithium-ion batteries due to their high capacity and cost efficiency compared with LiCoO 2 . However, the high-voltage operation of the Ni-rich oxides (>4.3 V) required for high capacity is inevitably accompanied with a rapid capacity decay over numerous cycles. In this work, we reported a surface coating of LiNi 0.6 Co 0.2 Mn 0.2 O 2 with Li 2 Si 2 O 5 via a facile and efficient synthetic approach, which involves the employment of silicic acid (H 2 SiO 3 ) as remover to react with the surface residual lithium compounds ( e.g. Li 2 CO 3 and LiOH) of LiNi 0.6 Co 0.2 Mn 0.2 O 2 and consequent formation of a robust and complete Li + -conductive Li 2 Si 2 O 5 protective coating layer . The structure and morphology of the coated cathode materials are fully characterized by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Compared with the pristine LiNi 0.6 Co 0.2 Mn 0.2 O 2 , coating with the Li + -conductive Li 2 Si 2 O 5 is found to be very effective for improving the rate capability of the LiNi 0.6 Co 0.2 Mn 0.2 O 2 when evaluated at a high cut-off voltage up to 4.5 V. Specifically, 1 wt. % H 2 SiO 3 -treated LiNi 0.6 Co 0.2 Mn 0.2 O 2 electrode exhibits high discharge specific capacities of 213.9 and 121.6 mAh g −1 at 0.1 and 10 C, respectively, whereas the pristine electrode only shows 196.8 and 92.1 mAh g −1 . Besides, the surface-modified LiNi 0.6 Co 0.2 Mn 0.2 O 2 electrode also manifests an enhanced long-term cycling stability (67% capacity retention after 200 cycles at 5 C), much better than the pristine electrode (52% retention) due to the robust protective effect of the Li 2 Si 2 O 5 coating layer. All these results indicate that the Li 2 Si 2 O 5 -coated LiNi 0.6 Co 0.2 Mn 0.2 O 2 will be a promising cathode material for lithium-ion batteries with fascinating electrochemical energy storage capabilities.
研究领域:
电化学
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材料科学
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能源存储
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锂离子电池技术
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固态化学
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表面改性
✓ 已验证
DOI
高影响因子
Additive Manufacturing
·
2022
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IF 11.632
Fang Su,Yu Liu,Cheng Zhang,Zhongqiang Luo,Jiwei Cao,Zhiyuan Liu,Pei Wang,Changyong Liu,Zhangwei Chen
This study presents a novel combined generative shaping and material-forming (GSM) approach for preparing tritium breeder units for fusion reactors using 3D printing technology . For the first time, defect-free lithium-rich Li 4 SiO 4 porous structures were successfully prepared by combining photopolymerization and reaction sintering processes based on the use of low-cost Li 2 CO 3 and SiO 2 ceramic powders . Investigation was conducted on the preparation of the ceramic powder-based mixture slurry as well as the photopolymerization 3D printing and reaction sintering processes . Li 4 SiO 4 -based porous lattice ceramics with high purity, no obvious defects, and adjustable packing fraction were fabricated. The mechanical properties of the samples prepared with different packing fractions were then evaluated. The prepared samples showed better mechanical properties than the pebble bed structures with similar packing fractions. At a packing fraction of 92.10%, the crushing strength and elastic modulus reached 186.49 ± 0.04 MPa and 16.47 ± 0.03 GPa, respectively. These results show that the combination of photopolymerization 3D printing and reaction sintering processes based on the use of low-cost ceramic powders has significant advantages in terms of flexibility and efficiency in structure design and fabrication and cost-effectiveness in material forming with enhanced performance, providing a promising route to produce high-performance tritium breeder structures for fusion technologies. In particular, the present combined method also paves a promising generalized way to enable effective generative structure-shaping and material-forming in the advanced ceramic manufacturing industry, not to mention that the preparation of high-performance Li 4 SiO 4 tritium breeder units for fusion technologies.
研究领域:
材料科学
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增材制造
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陶瓷工程
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核聚变技术
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先进制造
✓ 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）