ELECTROCHEMISTRY
·
2019
·Vol. 87
·期 3
·142-147
·
IF 1.293
Handong JIAO,Junxiang WANG,Donghua TIAN,Shuqiang JIAO
The electrochemical behaviour of Ti4+ (K2TiF6) at liquid tin and bismuth electrodes has been investigated by cyclic voltammetry, square wave voltammetry and chronoamperometry in the LiF–NaF–KF eutectic melt. Result shows that, on the liquid metal electrodes, the reduction reaction of the solvent occurs at more positive potential than that on the inert molybdenum electrode. There are two reduction steps including Ti4+ + e = Ti3+ and Ti3+ + 3e = Ti (Ti–Sn alloys) on the liquid tin electrode within the electrochemical window of the melt. However, only one redox process corresponding to the redox of the Ti4+/Ti3+ couple is observed at liquid bismuth electrode.
研究领域:
电化学
·
材料科学
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产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2021
·
IF 7.205
Jian Zhang,Jin Huang,Ruxia Liu,Guoqiang Luo,Qiang Shen
Immersion tests of AlN in LiF-LiCl-LiBr-Li salt have been performed at 500 °C to study the corrosion behaviour of AlN. The results show that AlN initially corroded at a higher rate (2⋅10 −5 mg/(mm 2 ⋅h)) during 0−50 h than during 50−300 h (6⋅10 -6 mg/(mm 2 ⋅h)) because the formation of an alumina corrosion layer protected the AlN from further corrosion. The addition of metallic Li at low concentrations (<0.1 wt. %) to the molten salt inhibited the corrosion of AlN by preferentially depleting oxygen impurities, while Li at high concentrations (>0.1 wt. %) accelerated corrosion by reacting with YAG in AlN.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Songsong Liu,Yulin Ma,Jiajun Wang,Pengjian Zuo,Chunyu Du,Geping Yin,Yunzhi Gao
Uniform lithium (Li) deposition and stable interface between anode and electrolyte are crucial factors for realizing the practical application of Li metal anode. Herein, a homogeneous lithium fluoride (LiF) protective layer with many nano slits is constructed on the Li anode by a facile vacuum evaporation method. It can uniformize the Li ion flux at surface of anode via its homogeneity and suppress the violent side reaction between Li and electrolyte via its good compactness. The existence of nano-slits allows the penetration of electrolyte and thus providing sufficient lithium ions transmission channels. Therefore, such a homogeneous LiF layer effectively inhibits the growth of Li dendrites and alleviates the consumption of active Li metal, significantly improving the stability of Li anode during long-term cycles. With the LiF-protected Li anode, the full cell with LiFePO 4 cathode delivers 2.5 times longer lifespan and slower capacity attenuation than control cells. This work highlights significant roles of homogeneous protective layer in stabilizing Li anode and supplies new insights in the design of anode interphase for rechargeable lithium metal batteries (LMBs).
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Juan Liu,Bing Liu,Cheng Chao Hu,Qing Wei Zhou,Kai Xin Song
(1– x )BaV 2 O 6 - x LiF ( x = 0.025, 0.05, 0.10, 0.15) ceramics with an ultra-low sintering temperature of 475 °C were synthesized using the standard solid-state reaction method. The ceramics demonstrated a remarkable enhancement in the quality factor ( Qf ), reaching a maximum value of 16,800 GHz at x = 0.10, which is 5.6 times higher than that of pure BaV 2 O 6 ceramics obtained in this work. A near-zero temperature coefficient of resonant frequency ( τ f = 1.44 ppm/°C) was simultaneously achieved, together with a dielectric constant ε r of 11.54. Additionally, the chemical compatibility between the present ceramics and the Al electrode was confirmed. Moreover, a millimeter-wave antenna with an excellent S 11 value of −50.3 dB, and a large bandwidth of 3.44 GHz was fabricated using the 0.9BaV 2 O 6 -0.1LiF ceramic as the dielectric resonator . These results highlight the potential application prospects of (1– x )BaV 2 O 6 - x LiF ceramics in the ultra-low temperature co-fired ceramic technology and 5 G millimeter-wave antennas.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Di Zhang,Pengfei Lv,Wei Qin,Yuanhua He
Lithium-metal anodes have attracted widespread attention owing to their high specific capacity. However, they still suffer from poor stability under high-rate cycling and safety issues, which are mainly induced by the significant growth of Li dendrites and the collapse of the solid electrolyte interphase during extended cycling. Effective protective coatings can withstand severe environmental corrosion during handling and cycling. In this study, we develop a convenient and controllable surface fluorination process to develop a dense and uniform ultrathin lithium fluoride (LiF) protective coating on the Li metal surface by vacuum evaporation . Advanced comprehensive analyses demonstrate that the 200 nm-thick LiF protective coating provides sufficient Li ion transmission channels for efficient transport. This reinforces the structural integrity to withstand volume changes during Li plating/stripping. The highly conformal LiF protective coating minimizes corrosion reactions with carbonate electrolytes and inhibits dendrite formation. Dendrite-free deposition is realized at a high current density of 3 mA cm – 2 . LiF@Li|LiFePO 4 full cells with a 200 nm LiF-coated Li anode exhibit up to 85.31% capacity retention over 600 cycles. Stable Li deposition is achieved for 1200 h under lean electrolyte conditions using a 200-nm LiF-coated Li anode. The developed protective coating shows excellent stabilizing effects on Li anodes and is expected to facilitate the optimization and practical application of Li metal anodes with sufficient interphase stability.
研究领域:
材料科学
·
电化学
·
能源存储技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Haitang Liao,Zhimin Li,Chuang Yu,Yuan Wang
The advent of solid-state lithium-ion batteries has made it possible to achieve high energy density and enhanced safety in energy storage systems. However, commercialization has been hindered by interfacial contact deterioration between lithium metal and the solid-state electrolyte, coupled with electron leakage issues. Interfacial issues fundamentally govern the battery's capability for stable and sustained energy conversion, while also determining the likelihood of lithium dendrite propagation and growth. Consequently, a lithiophilic-lithiophobic dual-functional SEI layer (LiF/AlF 3 ) is constructed from an AlF 3 -PVDF-HFP organic-inorganic composite interlayer in this research (named CPEA3). The LiF generated via in situ reaction between AlF 3 and metallic lithium, characterized by high electron insulation property and high interfacial energy toward lithium, effectively suppresses the nucleation and growth of lithium dendrites. Simultaneously, leveraging the high adhesion energy of AlF 3 to lithium effectively stabilizes interfacial contact during lithium stripping processes, thereby preventing delamination-induced interfacial polarization. Therefore, the improved Li symmetric cells demonstrate an ultrahigh critical current density (3.0 mA cm −2 ) and remarkable cycling stability exceeding 2,800 hours at 0.1 mA cm −2 . Notably, the Li|CPEA3/LLZGO/CPEA3|LiFePO 4 configuration demonstrates substantial long-term cycling stability with 95.1% capacity retention after 600 cycles at 0.5 C. This work provides an effect stagy to suppress side reactions at the electrode/electrolyte interface and impede lithium dendrite in solid-state battery penetration through the construction of an intermediate passivation layer.
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高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Wenya Lei,Yangyang Liu,Xingxing Jiao,Chaofan Zhang,Shizhao Xiong,Bing Li,Jiangxuan Song
Red phosphorus (P) is considered as an alternative anode material for high-energy-density lithium-ion batteries (LIBs) due to its high theoretical specific capacity and cost-effectiveness whereas practical application of phosphorus is severely hindered by the nature of low electrical conductivity and its huge volume change during the lithiation and delithiation process, leading to the failure of the electron conductive network and solid electrolyte interphase (SEI). Here, we reported a highly reversible P-based anode material for long-cycling and high-capacity LIBs. This hybrid anode (P-SP) is prepared with commercial red P and carbon black (Super-P) via ball-milling to obtain a nanoscale amorphous structure for excellent electron conductivity and minimized volume change. Furthermore, fluoroethylene carbonate (FEC) is introduced as an additive to form a LiF-rich SEI which enables stable cycling of a P-SP hybrid anode. As a result, the P-SP hybrid anode operating with the electrolyte of 10 vol % FEC exhibits a high capacity (2236.2 mAh g–1 at 0.3 C) and a stable cycling stability (86% retention of the second-cycle capacity after 300 cycles). With considerations of low-cost manufacture at a large scale and excellent electrochemical performances, our work may promote an effective strategy for practical application of P anode material in LIBs.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jian Wei,Jiamin Wang,Yuxuan Ji,Lei Hao,Hao Zhang,Xueting Li
LiCoO 2 (LCO) has found applications in a wide range of sophisticated domains due to its high compacted density and established market presence. However, low cycling stability and associated safety issues limit the indefinite use of high-pressure lithium cobaltate. Here, we employ wet chemistry to create a double-layer coating structure composed of conductive cyclized PAN (cPAN) and LiF nanoparticles on the surface of LCO. This structure significantly enhances electrical conductivity, reduces aging, and improves the cycling stability of LCO under high pressure. Additionally, it inhibits surface side reactions. The superior electrical conductivity of cPAN bolsters the conductive properties of the coating material while substantially decreasing its initial impedance. LiF coating further enhances the cycling and multiplication performance of high-voltage LCOs by minimizing surface side reactions and slowing electrolyte erosion of active materials. PAN@LiF@LCO cathode with synergistic effect shows good multiplication performance (1–4 C), good cycling stability, and high reversible capacity with capacity retention near 90 % after 100 cycles. This work provides a proactive strategy to identify the most practical and cost-effective means of improving the multiplication performance of the high-voltage LCO cathode materials.
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Chunjian Wang,Shuling Xiang,Liang Chen,Lingyan Liang,Jiangping Tu,Shengcheng Shen,Hongtao Cao,Hongliang Zhang
Electrochromic devices (ECDs) offer significant energy-saving potential for applications such as smart windows and displays by modulating optical properties in response to electrical stimuli. However, their widespread adoption is limited by challenges associated with electrolyte stability and the formation of a robust solid-electrolyte interphase (SEI). In this study, a novel quasi-solid polymer electrolyte (QSPE) based on a UV-curable matrix of poly(ethylene glycol) diacrylate (PEGDA) incorporated with poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) [P(VDF-TrFE-CFE), abbreviated as PVTC] is presented. The high dielectric constant of PVTC facilitates lithium-ion transport, while electrochemical cycling triggers partial dehydrofluorination, thereby promoting in situ formation of a LiF-rich SEI layer on WO 3 surface. The optimized electrolyte exhibits excellent properties, including high optical transparency (88.7%), ionic conductivity (1.76 mS cm −1 ), and mechanical robustness. When applied in ECDs, PVTC enables outstanding performance, achieving 86.29% optical retention from the 5000th to the 40 000th cycle and 98.78% charge retention after 50 000 charge–discharge cycles. Furthermore, prototype demonstrations in smart windows and electrochromic sunglasses validate the scalability and flexibility of the proposed system, highlighting a promising strategy for advancing durable, high-performance ECDs through innovative electrolyte design.
研究领域:
材料科学
·
电化学
·
能量存储
·
智能器件
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 48
·期 7
·10288-10298
·
IF 4.527
Jian Wei,Yuxuan Ji,Di Liang,Bing Chen,Chao Jiang,Xueting Li
The mutability of layered structures and unfavorable side reactions between cathodes and traditional electrolytes are barriers for the commercialization of LiCoO 2 (LCO) at high voltages (above 4.2 V). Metal fluorides, owing to their effective passivation effect, have been considered promising coating materials for various electrochemical applications. As a chemical stability species, LiF can combine the advantages of fluorides with those of lithium without introducing extra elements. In this study, we deposited a uniform nanosized LiF thin film coating onto the LCO particles by coprecipitation to enhance the reversible capacity and cycle stability of the LCO batteries at high voltage. Electrochemical tests indicated that at room temperature, the LCO@LiF cell exhibited an excellent capacity retention with 71.4% after 300 cycles, which is higher than that of many reported oxide and fluoride coatings for LCO at high voltage. This study demonstrated that LiF, an outstanding cathode surface protection layer, can hamper the immediate contact of LCO with the electrolyte, stabilize the LCO surface structure, and successfully protect the cathode from corrosion by the electrolyte. Consequently, a significant enhancement of the electrochemical properties of the LiF-coated LCO was observed. This study provides a facile commercial approach for the mass production of high-voltage LCO cathodes.
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Yu Yan,Jingzhao Chen,Jinyang Li,Yiwei Cai,Xiaoyan Zhang,Ziqiang Niu,Yuwen Liu,Feng Huo,Suojiang Zhang
The prevailing view in lithium-metal batteries (LMBs) regards LiF-rich solid electrolyte interphases (SEIs) as essential for interfacial stability, making fluorinated electrolytes the default choice. This consensus relies mainly on empirical performance rather than quantitative decoupling of individual inorganic components. Here, we isolate LiF, Li 2 CO 3 , and Li 2 O monocomponent SEIs and quantify key descriptors, including exchange current density, ionic/electronic conductivities, activation energies, and mechanical strength. We observe pronounced functional asymmetry: no single component satisfies all demands. Using power-law composition–property mapping and weighted multi-objective optimization, we establish a predictive framework for SEI design. Surprisingly, the model predicts an optimal composition dominated by Li 2 O with a minor Li 2 CO 3 fraction (Li 2 CO 3 /Li 2 O = 0.1428/0.8572), excluding LiF. A symmetric cell with this optimized SEI cycles stably for over 2400 h at 0.5 mA cm −2 . In Li||LFP full cells, 49% of the initial capacity (105 mAh g −1 ) is retained after 900 cycles at 4 C, outperforming all monocomponent SEIs. In LiF-free cells using a non-fluorinated electrolyte, the optimized SEI delivers improved performance. These results show that the “LiF considered a key component for stable SEI” paradigm fails when SEI is deconvoluted into quantifiable physicochemical parameters. Interfacial stability arises from multi-parameter synergy rather than single-component preference.
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DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Junfei Zhou,Jingtao Zhao,Gongxun Bai,Shilong Zhao,Shiqing Xu,Lihui Huang
Ce 3+ doped lithium germanate glass ceramics containing LiF nanocrystals were fabricated through melt-quenching technique and subsequent heat-treatment process. As demonstrated by XRD results, the grain size of the precipitated LiF nanocrystals falls within the range of 15.7 to 21.1 nm. Upon 350 nm light excitation, the emission spectra of both the glass and GC samples display a broadband spectrum, with the peak at 410 nm. The luminescence intensities of the GC samples are markedly higher than the as-prepared glass. Moreover, the luminescence intensity of the GC samples gradually augments with the elevation of heat-treatment temperature and the extension of treatment time. The fluorescence lifetimes of the GC samples range from 17.56 ns to 21.27 ns. The results are instructive for the research and development of the germanate glass ceramics containing 6 Li for thermal neutron detection.
研究领域:
材料科学
·
核探测
·
发光材料
·
玻璃陶瓷
·
辐射探测
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DOI
高影响因子
危险品化学品经营许可证（带存储）