ECS Journal of Solid State Science and Technology
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2016
·Vol. 5
·期 9
·R137
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IF 1.65
Wenjuan Bian,Yushuang Qi,Xuhui Xu,Dacheng Zhou,Yong Yang,Jianbei Qiu,Xue Yu
The influence of the introduction of Li+ ions on the upconversion (UC) properties of KLu2F7:Yb3+, Er3+ nanocrystalline has been investigated in detail. It is found that the UC emission intensity of 10 mol% Li+ ions doped KLu2F7:Yb3+, Er3+ nanocrystalline is enhanced about 13 times in comparison with that of Li+-free sample. Under the excitation of 980 nm laser diode (LD), a significant improvement of the green to red emission ratio (GRR) in the 10 mol% Li+-doped sample is observed by increasing pump power density. Li+ ions could occupy the cationic sites or the interstitial sites in the KLu2F7 host matrix, which probably eliminate the defect states via the charge compensation and tailor of the crystal field, leading to the promotion of the UC emission efficiency. Thus, the introduction of Li+ ions provides new opportunities for enhancing the scope of applications of Yb3+, Er3+ doped KLu2F7 nanocrystalline ranging from infrared solar cells to volumetric multiplexed bio-probe.
研究领域:
材料科学
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光学
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DOI
高影响因子
Journal of Advanced Ceramics
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2020
·Vol. 9
·期 4
·471-480
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IF 2.889
Huang Fangyi,Su Hua,Li Yuanxun,Zhang Huaiwu,Tang Xiaoli
In this study, low-temperature fired CaMg 1− x Li 2 x Si 2 O 6 microwave dielectric ceramics were prepared via the traditional solid-state reaction method. In this process, 0.4 wt% Li 2 CO 3 -B 2 O 3 -SiO 2 -CaCO 3 -Al 2 O 3 (LBSCA) glass was added as a sintering aid. The results showed that ceramics consisted of CaMgSi 2 O 6 as the main phase. The second phases were CaSiO 3 always existing and Li 2 SiO 3 occurring at substitution content x > 0.05. Li + substitution effectively lowered sintering temperature due to 0.4 wt% LBSCA and contributed to grain densification, and the most homogeneous morphology could be observed at x = 0.05. The effects of relative density, the second phase, and ionic polarizability on dielectric constant (ε r ) were investigated. The quality factor ( Q × f ) varied with packing fraction that concerned the second phase. Moreover, the temperature coefficient of the resonant frequency (τ f ) was influenced by MgO 6 octahedral distortion and bond valence. Excellent dielectric properties of the CaMg 1− x Li 2 x Si 2 O 6 ceramic was exhibited at x = 0.05 with ε r = 7.44, Q × f = 41,017 GHz ( f = 15.1638 GHz), and τ f = −59.3 ppm/°C when sintered at 900 °C. It had a good application prospect in the field of low-temperature co-fired ceramic (LTCC) substrate and devices.
研究领域:
材料科学
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电子材料
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DOI
高影响因子
Separations
·
2022
·Vol. 9
·期 7
·180
·
IF 3.344
Lei Ma,Qiuyan Bi,Yuanhui Tang,Chao Zhang,Fuju Qi,Hao Zhang,Yifan Gao,Shiai Xu
In order to recover lithium from brine with a high Mg2+/Li+ratio, a positively charged nanofiltration (NF) membrane was prepared by depositing polydopamine (PDA)-coated graphitic carbon nitride (g-C3N4) as the interlayer (PDA-g-C3N4) and the interfacial polymerization (IP) of polyethyleneimine (PEI) and trimesoyl chloride (TMC) was carried out. Under optimal conditions, the water contact angle of the composite membrane is only 55.5° and the isoelectric point (IEP) is 6.01. The final positively charged NF membrane (M5) exhibits high permeance (10.19 L·m−2·h−1·bar−1) and high rejection of Mg2+(98.20%) but low rejection of Li+(13.33%). The separation factor (SF) is up to 48.08, and the Mg2+/Li+ratio of the permeate is 0.036 in the simulated brine. In conclusion, the M5 membrane shows a good separation performance for salt lake brine (SF = 12.79 and Mg2+/Li+ratio of the permeate = 1.43) and good fouling resistance. Therefore, the positively charged M5 membrane with PDA-g-C3N4as the interlayer has the potential to be used for the recovery of lithium from brine.Keywords:polydopamine;graphitic carbon nitride;nanofiltration membrane;brine;Mg2+/Li+separation
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuanjun Zhao,Mengqiu Gao,Yanyang Qin,Xinyu Da,Xuetian Deng,Xin Jia,Kai Xi,Yaqiong Su,Shujiang Ding,Qiang Rong,Xiangpeng Kong,Guoxin Gao
Fabricating flexible composite polymer electrolytes (CPEs) with vertically aligned ion transport pathways is necessary for the application of solid-state lithium metal batteries (LMBs), yet the orientation of polymer matrix usually is disorder, thus the improvement in ionic conductivity is unsatisfied. Herein, we develop a simple electric field induced molecular orientation strategy to fabricate the flexible CPEs with vertically aligned ion transport pathways. Driven by direct current (DC) electric field (e.g. 1.5 MV m −1 ), the polar 15C5-Li + dipoles and monomer molecules are oriented regularly and cured to form flexible three dimension (3D) cross-linked structure. As a result, numerous vertically-aligned ion transport pathways have been generated in the vertically oriented arrangement CPEs, thus presenting highly enhanced ionic conductivities, mechanical strength and superb inhibition ability to lithium dendrite growth. When used as CPEs for Li||LiFePO 4 (LFP) batteries, the vertically oriented CPEs exhibit excellent rate and long-term cycle stability with a reversible discharge capability of 124.9 mAh g −1 after 350 cycles at 1C and 60 °C. However, the randomly oriented CPEs deliver much poor cycle and rate performance at the same conduction. It can also be compatible with NCM811|Li batteries at 30 °C. Therefore, our simple DC electric field induced molecular orientation strategy holds a great application promise to construct the fast ion transport channels for the all-solid-state LMBs.
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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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 39
·20650-20657
·
IF 11.301
Ruiyi Gan,Yiling Liu,Na Yang,Cheng Tong,Mingming Deng,Qin Dong,Xianyi Tang,Na Fu,Cunpu Li,Zidong Wei
Li metal anodes, which possess ultrahigh theoretical capacity, are considered the ultimate solution for high energy density batteries. However, issues regarding safety and rapid electrode degradation due to Li dendrite growth have restricted the commercialization of Li metal anodes for several decades. Herein, a stable, dendrite-free Li metal anode with a hairy-layered architecture is reported, which is realized though a facile electrochemical deposition of Li on a lithiophilic LTO/Ti3C2 composite. The simultaneous formation of the lithiophilic composite could induce the uniform deposition of Li ions and acted as an interlayer skeleton for the intercalation of Li ions. A microscale uniform electric field could also be formed to regulate the Li-ion deposition behaviour. Thus, the growth of dendrites could be inhibited, the formation of dead Li could be prevented, and a stable, long-life Li metal anode could be realized. The obtained Li/LTO/Ti3C2/Cu electrode could reversibly charge/discharge for 2000 h with a high current of 1 mA cm−2 and an ultralow voltage hysteresis of 20 mV. Full batteries with the Li/LTO/Ti3C2/Cu anode exhibit excellent electrochemical performance. This work provides a promising anode design strategy for the fabrication of high-performance and safe Li metal batteries.
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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DOI
高影响因子
Inorganics
·
2025
·Vol. 13
·期 4
·115
·
IF 3
Yinan Liu,Wei Jiang,Congcong Zhang,Pingshan Jia,Zhiyuan Zhang,Yun Zheng,Kunye Yan,Jun Wang,Yunxian Qian,Junpo Guo,Rong Chen,Yike Huang,Yingying Shen,Lifen Long,Bang Zheng,Huaiyu Shao
Pre-lithiation using Li–Si alloy-type additives is a promising technical approach to address the drawbacks of Si-based anodes, such as a low initial Coulombic efficiency (ICE) and inevitable capacity decay during cycling. However, its commercial application is limited by the air sensitivity of the highly reactive Li–Si alloys, which demands improved environmental stability. In this work, a protective membrane is constructed on Li13Si4alloys using low-surface-energy paraffin and highly conductive carbon nanotubes through liquid-phase deposition, exhibiting enhanced hydrophobicity and improved Li+/e−conductivity. The Li13Si4@Paraffin/carbon nanotubes (Li13Si4@P-CNTs) composite achieves a high pre-lithiation capacity of 970 mAh g−1and superb environmental stability, retaining 92.2% capacity after exposure to ambient air with 45% relative humidity. DFT calculations and in situ XRD measurements reveal that the paraffin-dominated coating membrane, featuring weak dipole–dipole interactions with water molecules, effectively reduces the moisture-induced oxidation kinetics of Li13Si4@P-CNTs in air. Electrochemical kinetic analysis and XPS depth profiling reveal the enhancement in charge transfer dynamics and surface Li+transport kinetics (SEI rich in inorganic lithium salts) in P-SiO@C pre-lithiated by Li13Si4@P-CNTs pre-lithiation additives. Benefitting from pre-lithiation via Li13Si4@P-CNTs, the pre-lithiated SiO@C(P-SiO@C) delivers high ICE (103.7%), stable cycling performance (981 mAh g−1at 200 cycles) and superior rate performance (474.5 mAh g−1at 3C) in a half-cell system. The LFP||P-Gr pouch-type full cell exhibits a capacity retention of 83.2% (2500 cycles) and an energy density of 381 Wh kg−1after 2500 cycles. The Li13Si4@P-CNTs additives provide valuable design concepts for the development of pre-lithiation materials.
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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高影响因子
Science Bulletin
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2024
·
IF 18.8
Zhihong Bi,Anping Zhang,Gongrui Wang,Cong Dong,Pratteek Das,Xiaoyu Shi,Zhong-Shuai Wu
High-voltage and fast-charging LiCoO 2 (LCO) is key to high-energy/power-density Li-ion batteries. However, unstable surface structure and unfavorable electronic/ionic conductivity severely hinder its high-voltage fast-charging cyclability. Here, we construct a Li/Na-B-Mg-Si-O-F-rich mixed ion/electron interface network on the 4.65 V LCO electrode to enhance its rate capability and long-term cycling stability. Specifically, the resulting artificial hybrid conductive network enhances the reversible conversion of Co 3+/4+ /O 2−/ n − redox by the interfacial ion–electron cooperation and suppresses interface side reactions, inducing an ultrathin yet compact cathode electrolyte interphase. Simultaneously, the derived near-surface Na + /Mg 2+ /Si 4+ -pillared local intercalation structure greatly promotes the Li + diffusion around the 4.55 V phase transition and stabilizes the cathode interface. Finally, excellent 3 C (1 C = 274 mA g −1 ) fast charging performance is demonstrated with 73.8% capacity retention over 1000 cycles. Our findings shed new insights to the fundamental mechanism of interfacial ion/electron synergy in stabilizing and enhancing fast-charging cathode materials.
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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DOI
高影响因子
Energy Storage Materials
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2023
·
IF 20.4
Xiaoyu Zhang,Jinhuan Wang,Dongqi Hu,Wei Du,Chuanxin Hou,Huiyu Jiang,Yuting Wei,Xiao Liu,Fuyi Jiang,Jianchao Sun,Hua Yuan,Xiaoyu Huang
The large scale application of solid state lithium metal batteries based on NASICON-type Li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP) electrolyte has been hindered by insufficient ion conductivity and interface instability due to the spontaneous Ti 4+ reduction reaction between Li metal and LATP. To address these issues, Li 1.7 Al 0.3-x Bi x Ti 1.7 (PO 4 ) 3 (0 ≤ x ≤ 0.03) (LABTP) electrolytes were prepared, and the influence of Bi substitution on the microstructure and conductivity of LATP were investigated. Suitable amount of Bi substitution accelerates densification and improves the ionic conductivity . Furthermore, unlike commonly used polyethylene oxide (PEO) and polyvinylidene difluoride (PVDF), polyvinylbutyral (PVB)-based quasi-solid electrolytes with LABTP is first-time proposed to improve the compatibility and stability of the LATP/Li interface. The synergistic effect of Bi doping and PVB reduces the reduction reaction of Ti 4+ . Small voltage hysteresis is observed in the corresponding Li||Li symmetric cells. The solid-state Li|LABTP@PVB|LiFePO 4 full cell can deliver a high capacity of 146.2 mAh g −1 and a stable cycling performance without reduction after 200 cycles.
研究领域:
材料科学
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电化学
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电池技术
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jing Wang,Jia-Wei Fang,Zhi-Yong Ji,Zhi-Yuan Guo,Xin-Wei Li,Jie Liu,Ying-Ying Zhao,Zhong Liu,Feng-Feng Gao,Yuan Zhong,Jun-Sheng Yuan
Lithium extraction from the solution in low Li + concentration by an energy-saving and high-efficiency method is still a challenge. Herein, a novel hollow porous LiMn 2 O 4 (H-LMO) with highly active site was proposed to enhance the extraction performance of Li + . Based on the established hollow porous structure, the H-LMO film electrode (H-LMOE) exhibits excellent lithium electrosorption performance and stability. Under the current density of 0.5 C, the electrosorption capacity of Li + could reach 31.52 mg/g, the separation coefficient of Li + /Mg 2+ was 581.67, and the energy consumption was as low as 0.49 Wh/mol Li. This unique structural strengthening mechanism made H-LMOE maintain a good Li + extraction performance even in a solution of low Li + concentration. The Li + electrosorption capacity of H-LMOE was 2.13 times that of T-LMOE in a 60 mg/L Li + solution, while the specific energy consumption of the H-LMOE was 15.78% lower than that of the traditional-LiMn 2 O 4 film electrode (T-LMOE). Even in a 10 mg/L Li + solution, the electrosorption capacity of H-LMOE was 21.48 mg/g, which was 10.0% higher than that of T-LMOE. Moreover, after 50 recycling processes, the final electrosorption capacity of the H-LMOE was about 25.0% higher than that of the T-LMOE.
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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DOI
高影响因子
Carbohydrate Polymer Technologies and Applications
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2024
·
IF 6.2
Zhiqiang Pang,Ning Li,Cuihua Dong,Hairui Ji,Yang Liao,Guihua Yang,Xuejun Pan
Lithium bromide molten salt hydrate (∼62 wt% aqueous solution of LiBr) can dissolve cellulose, but the cellulose dissolution mechanisms are not fully understood. This study revisited cellulose dissolution in the LiBr solution and aimed to provide new insights into the dissolution mechanisms. The collected evidence suggested that cellulose dissolution in the LiBr solution is primarily attributed to the disruption of intermolecular H-bonds of cellulose by the ion-dipole coordination between hydrated Li + and cellulose hydroxy. The coordination between Li + and cellulose was verified by 7 Li NMR and simultaneous DSC-TGA analysis. The observations in this study also suggest that polarizable, large-size, and low-electronegativity Br – plays a synergetic and supplementary role in the dissolution of cellulose. In addition, the dissolution of cellulose in the LiBr solution is greatly dependent on dissolution conditions (LiBr concentration, temperature, pH, and cellulose loading) and cellulose properties (particle size and degree of polymerization).
研究领域:
化学工程
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材料科学
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产品关联
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Li Wang,Danyal Rehman,Peng-Fei Sun,Akshay Deshmukh,Liyuan Zhang,Qi Han,Zhe Yang,Zhongying Wang,Hee-Deung Park,John H. Lienhard,Chuyang Y. Tang
Nanofiltration (NF) with high water flux and precise separation performance with high Li+/Mg2+ selectivity is ideal for lithium brine recovery. However, conventional polyamide-based commercial NF membranes are ineffective in lithium recovery processes due to their undesired Li+/Mg2+ selectivity. In addition, they are constrained by the water permeance selectivity trade-off, which means that a highly permeable membrane often has lower selectivity. In this study, we developed a novel nonpolyamide NF membrane based on metal-coordinated structure, which exhibits simultaneously improved water permeance and Li+/Mg2+ selectivity. Specifically, the optimized Cu–m-phenylenediamine (MPD) membrane demonstrated a high water permeance of 16.2 ± 2.7 LMH/bar and a high Li+/Mg2+ selectivity of 8.0 ± 1.0, which surpassed the trade-off of permeance selectivity. Meanwhile, the existence of copper in the Cu–MPD membrane further enhanced anti-biofouling property and the metal-coordinated nanofiltration membrane possesses a pH-responsive property. Finally, a transport model based on the Nernst–Planck equations has been developed to fit the water flux and rejection of uncharged solutes to the experiments conducted. The model had a deviation below 2% for all experiments performed and suggested an average pore radius of 1.25 nm with a porosity of 21% for the Cu–MPD membrane. Overall, our study provides an exciting approach for fabricating a nonpolyamide high-performance nanofiltration membrane in the context of lithium recovery.
研究领域:
材料科学
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环境工程
·
化学工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
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IF 7.3
Runqiao Hou,Yuchen Yang,Kaixin Ren,Shouyi Yuan,Yonggang Wang
Batteries with Li metal anodes are promising to achieve ultrahigh energy densities over 500 Wh kg–1. However, Li dendrite growth and related issues hinder their practical application. Although strategies like “salt-in-solvent” and “weakly solvating” approaches have been successfully demonstrated to suppress the dendrite growth and achieve high energy densities by enhancing the oxidative tolerance of ethereal electrolytes, they often compromise Li+ dissociation, thus undermining their fast-charging performance. Herein, we propose a synergic regulation strategy of Li+ desolvation kinetic and Li metal interfacial chemistry via the addition of hexafluorobenzene (HFB) and ionic liquid (N-propyl-N-methylpyrrolidinium nitrate (Py13NO3)). In this electrolyte, NO3– and FSI– anions penetrates into the inner solvation shell of Li+, weakening the solvation strength of 1,2-Dimethoxyethane (DME), meanwhile, the Py13+ drags the FSI–, NO3– anions and the DME, thus prompting the desolvation process of Li+. Meanwhile, the interfacial adsorption of HFB facilitates the formation of a LiF-rich interphase with improved ionic conductivity. Consequently, the electrolyte containing 2 M LiFSI 0.3 M Py13NO3 in DME/HFB (9/1, v/v) demonstrates excellent cycling stability in high-voltage Li || NCM811 cells, maintaining 83.8% capacity retention over 800 cycles at a high rate of 5 C. Notably, even under a stringent negative/positive capacity (N/P) ratio of 1, the capacity retention of 82.1% is still retained after 100 cycles.
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高影响因子
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