CHINESE CHEMICAL LETTERS
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2025
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IF 8.9
Bin Wang,Qingqing Zhou,Junjie Lu,Chuyang Li,Mengmeng Fan,Wenwei Ding,Bifu Sheng,Wenjuan Zhu,Qian Ni,Huixin Chen,Xiang Han
Poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP)-based solid polymer electrolytes show great potential for high energy lithium metal batteries, however, the residual solvent and related severe side reactions limit its development. Herein, a PVDF-HFP-based solid polymer electrolyte modified by fluorobenzene (FB) co-solvent is designed to address these problems. The introduced FB with weak solvation interaction regulates the coordination environment and induces anions to enter the solvation structure, generating more contact ion pairs (CIPs) and aggregates (AGGs). In addition, the anions-derived LiF-rich interphases help to improve the interface stability against Li metal. As a result, the FB-PVDF-HFP achieves high ionic conductivity (4.1 × 10 −4 S/cm) and low activation energy (0.125 eV) at room temperature. In addition, Li||Li symmetric cells using FB-PVDF-HFP electrolyte can achieve uniform and dendrite-free lithium deposition/stripping in the long-term cycling over 2300 h. The assembled solid-state Li|FB-PVDF-HFP|LFP full cell shows improved rate performance and cycling performance (600 cycles at 0.5 C and 450 cycles at 3 C) at room temperature. This work verifies the feasibility of fluorinated terminated solid polymer electrolytes on its lithium-ion transport and interfacial stability in lithium metal batteries.
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高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Junjie Lu,Bifu Sheng,Minfeng Chen,Min Xu,Yiyi Zhang,Sheng Zhao,Qingqing Zhou,Chuyang Li,Bin Wang,Jingjing Liu,Jizhang Chen,Zhichao Lou,Xiang Han
Polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) based polymer electrolyte shows mechanical flexibility, soft and intimidate physical contact and good electrochemical stability, however, low ionic conductivity at room temperature and unstable interphases against Li metal hinder its application. In this article, we propose a universal strategy to prepare localized high concentration polymer electrolytes (LHCPE) in which high concentration lithium salt (LiTFSI) dissolved in tiny residual solvent (DMF) and the PVDF-HFP serves as solid dilution. The LHCPE regulates the solvation structure of lithium ions with anions instead of DMF solvent, allowing more anions to coordinate with Li + and forming amount contact ion pairs (CIPs) and aggregates (AGGs). As a result, high ionic conductivity (5.9 × 10 −4 S cm −1 ) and low activation energy (0.10 eV) achieved. The LHCPE also induces the decomposition of anions-derived LiF-rich interphases, that is ionic conducive and mechanical robust, thereby greatly improving the charge transfer kinetics and stability towards Li metal anodes . Consequently, at 0.5 mA cm −2 and 0.25 mAh cm −2 , stable and long-term cycling over 2000 h obtained under room temperature in Li//Li symmetric cells achieved. The full solid-state LFP//LHCPE//Li cells further exhibit excellent capacity retention of 82.83 % even after 1200 cycles at room temperature and a high rate of 8 C (1C=170 mA·g −1 ). Our work shed light on the design of high-performance polymer-based composite electrolytes by manipulating the Li solvation structure.
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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固态离子学
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电池技术
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高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Jing Pan,Yongde Yan,Yuan Deng,Xuepeng Wang,Li Ding,Xin Kong,Yun Xue,Fuqiu Ma,Kai Zhu,Wei Liu
Electrolyte is considered to be one of the key factors affecting electrolysis in the rare earth and their alloys industry. Generally, the fluoride system is chosen as the electrolyte for industrial production. However, the molten salt electrolysis method for fluoride-oxide systems is not well understood and has not been systematically studied at this stage. In order to supplement this part, lanthanum (La) ions have been chosen as the research object in this paper to systematically investigate the preparation of La–Ni alloy from LaF3–LiF-CaF2–La2O3 molten salt. A series of electrochemical methods were used to investigate the mechanism and kinetic properties of La(III) reduction on W and Ni electrodes. The electrochemical reduction properties and kinetic parameters of La were obtained. La–Ni alloy was prepared by potentiostatic electrolysis, and it was verified by detailed analysis through characterization methods. On this basis, LaNi5 intermetallic compound was successfully prepared on Ni electrode. This study provides valuable theoretical guidance for the development of La alloy preparation with fluoride salt systems in industry.
研究领域:
材料科学
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电化学工程
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaoxue Zhu,Kai Yang,Zhen Zhang,Siyuan He,Zihao Shen,Wei Jiang,Yiling Huang,Yan Xu,Qiutong Jiang,Limei Pan,Qian Li,Jian Yang
MXenes, represented by Ti3C2Tx, have been widely studied in the electrochemical energy storage fields, including lithium-ion batteries, for their unique two-dimensional structure, tunable surface chemistry, and excellent electrical conductivity. Recently, Nb2CTx, as a new type of MXene, has attracted more and more attention due to its high theoretical specific capacity of 542 mAh g–1. However, the preparation of few-layer Nb2CTx nanosheets with high-quality remains a challenge, which limits their research and application. In this work, high-quality few-layer Nb2CTx nanosheets with a large lateral size and a high conductivity of up to 500 S cm–1 were prepared by a simple HCl-LiF hydrothermal etching method, which is 2 orders of magnitude higher than that of previously reported Nb2CTx. Furthermore, from its aqueous ink, the viscosity-tunable organic few-layer Nb2CTx ink was prepared by HCl-induced flocculation and N-methyl-2-pyrrolidone treatment. When using the organic few-layer Nb2CTx ink as an additive-free anode of lithium-ion batteries, it showed excellent cycling performance with a reversible specific capacity of 524.0 mAh g–1 after 500 cycles at 0.5 A g–1 and 444.0 mAh g–1 after 5000 cycles at 1 A g–1. For rate performance, a specific capacity of 159.8 mAh g–1 was obtained at a high current density of 5 A g–1, and an excellent capacity retention rate of about 95.65% was achieved when the current density returned to 0.5 A g–1. This work presents a simple and scalable process for the preparation of high-quality Nb2CTx and its aqueous/organic ink, which demonstrates important application potential as electrodes for electrochemical energy storage devices.
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
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Fengchen Zhou,Lingyu Liu,Dongju Dai,Zhongning Huang,Yun Han,Jinchan Huang,Yatong Yang,Yankun Zou,Shoujie Guo,Xiaoyang Zhao,Pinjiang Li,Xiaolong Li,Junmin Nan
Black phosphorus (BP) has been highly regarded as a favourable candidate for fast-charging anode applications owing to its high theoretical capacity and advantageous charge–discharge platform. However, BP faces challenges related to compromised electrochemical performance resulting from an unstable solid-electrolyte interface (SEI) and substantial volumetric expansion. This study proposes the engineering of an inorganic-dense SEI on the surface of BP-C through the strategic incorporation of lithium fluoride (LiF). The presence of LiF in the system preferentially promotes LiPF 6 adsorption from the electrolyte, facilitating the in-situ formation of a lithium-enriched inorganic SEI film on the BP-C particulate surfaces. This strategic formation effectively mitigates subsequent electrolytic decomposition, accommodates volumetric expansion, and substantially improves the rate capability and cycling stability of the system. Consequently, the BP-LiF-C electrode demonstrates high initial coulombic efficiency of 86.8 % and maintains a steady capacity of 926.1 mAh g −1 over 700 cycles at 2000 mA g −1 . Moreover, when paired with a LiFePO 4 cathode, the full cell exhibits long cycling stability, retaining 98.6 % of its capacity after 500 cycles at 2000 mA g −1 , and performs at high rate. Therefore, utilising LiF to modulate the interfacial architecture of BP-based electrode composites provide notable guidance to enhance energy storage systems.
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
Energy & Environmental Materials
·
2020
·Vol. 4
·期 2
·208-212
·
IF 0
Jinhang Lv,Ruilin Zheng,Peng Lv,Wei Wei
A solid electrolyte of LAGP [Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 ] contained 0.5 wt% LiF was prepared by using low-volatile raw materials. The effects of different heat treatment conditions (750–900 °C, 4–10 h) and additive (LiF) on the ionic conductivity, structural morphology, and crystal transformation process were investigated in detail. EIS (electrochemical impedance spectroscopies) showed that the ionic conductivity of LAGP contained 0.5 wt% LiF had a highest value of 3.17 × 10 −4 S cm −1 with low activation energy (0.31 eV) after treating 825 °C for 6 h, more than LAGP of 2.45 × 10 −4 S cm −1 . DSC analysis and SEM images indicated that adding a small amount of LiF to LAGP not only can lower the glass transition temperature (from 513 °C to 507 °C) and crystallization temperature (from 622 °C to 605 °C), but also can modify the grain boundary and increase the relative density of LAGP (from 95.8% to 97.7%).
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OPTICS AND LASERS IN ENGINEERING
·
2020
·
IF 4.273
Weicheng Cai,Hui Huang,Zhibo Yang,Ruichen Shang,Xuejing Li,Chi Ma,Jian Zhao,Pengbo Liu,Jian Wang,Wei Wang
For laser-induced fluorescence (LIF), the SNR and related concentration detectability was severely limited by background signal (noise). Herein, an axial-excitation LIF based on pinhole metal-capillary (PMC) and direct laser-diode excitation was proposed. An overall ~480 fold improvement on SNR was realized, because the laser-sidewall interaction ( LSI ) and related background signal (noise) can be effectively suppressed in PMC by avoidance of laser leakage and laser contact with capillary sidewall. For rhodamine B detection without sample enrichment, a detection limit of concentration (DLC) of 0.4 pM was obtained, which is 2.5 fold lower than the DLC (1 pM) of commercial LIFs equipped with bulky and expensive Ar + laser. For selective detection of Cu 2+ , a DLC of 5 pM was realized, which is more than 40 fold lower than that of previous fluorimetry detection with similar quantum-dot probe. The PMC-LIF features compact (16 × 4 × 4 cm 3 ), low-cost and high concentration detectability.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Tingzhi Deng,Qiwei Han,Huanhuan Liu,Ji Hu,Jing Wang,Xinyue Huang,Qiuxiao Lu,Zhipeng Wang,Binghua Zhou
Lithium metal has attracted extensive attention as a promising anode material for high-performance lithium batteries. However, an unstable and fragile solid electrolyte interphase (SEI) could be formed by the side reactions between Li metal and liquid electrolytes and induce the formation of dendritic growth. Here, we propose a facile strategy to fabricate fluorine- and nitrogen-donating gel polymer electrolytes (FN-GPEs) via the polymerization of hexafluorobutyl methacrylate (HFBMA) and triazole-based methacrylate (TBMA). A uniform porous structure is formed through the regulation of the ratio of HFBMA and TBMA in the polymer matrix, which is beneficial for absorbing the liquid electrolyte and enhancing the ionic conductivity. More significantly, the FN-GPEs containing abundant fluorinated and nitrided chains could form a stable SEI in situ with the components of LiF and Li3N. This facile strategy can achieve the complementary advantages of LiF- and Li3N-based SEI protective layers and significantly enhance the interfacial stability. Consequently, the FN-GPEs exhibit high porosity, high ionic conductivity, enhanced Li-ion transference number, and a wide electrochemical window, which endow the Li/Li symmetrical cells with excellent cyclic stability, and the LiFePO4/Li batteries show good long-term cycling stability. This work provides a new avenue to construct a stable SEI in situ on Li metal via molecular design to achieve high-performance LMBs.
研究领域:
材料科学
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电化学
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高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 24
·2964-2970
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IF 3.1
Shaoyan Zhang,Jinfeng Ning,Qingqing Wang,Wei Wang
Flavonoids are widely used in the treatment of various diseases due to their antioxidant, anti-inflammatory, anticancer and antiviral properties. Fluorescence detection is rarely applied for the determination of flavonoids because of their weak fluorescence. In this work, a method of fluorescence enhancement of flavonoids was firstly introduced by using sodium acetate for flavonoid derivatization. The study discovered that flavonoids, with a hydroxyl at the C3 position, had the ability to emit strong fluorescence after derivatization. Five flavonoids, kaempferide, galangin, isorhamnetin, kaempferol and quercetin, having a special structure, were selected, derivatized and analyzed by capillary electrophoresis with laser-induced fluorescence detection. Under the optimal conditions, the five flavonoids could be completely separated within 3 minutes. Good linear relationships were obtained for all analytes and the limits of detection for the five flavonoids were in the range of 1.18–4.67 × 10−7 mol L−1. Finally, the method was applied to the determination of flavonoids in five traditional Chinese medicines: aster, chamomile, galangal, tangerine peel and cacumen biotae. Flavonoids were successfully found in all these medicines by the developed method. The recoveries were in the range of 84.2–111%. The method developed in this study was fast, sensitive and reliable for the determination of flavonoids.
研究领域:
分析化学
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药学
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植物化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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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
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DOI
高影响因子
ORGANIC ELECTRONICS
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2018
·
IF 3.68
Weijia Xie,Jianping Zhou,Sumei Huang,Wei Ou-Yang,Wenhui Xie,Zhuo Sun,Xiaohong Chen
Plasmon enhanced perovskite solar cells (PSCs) incorporated with AgAl and Au composite nanoparticles (NPs) isolating from AgAl metal electrode with ultra-thin LiF spacer were investigated. PSCs with AgAl-Au composite NPs got 17.02% of the power conversion efficiency (PCE), which is 11.10% higher than PCE (15.32%) of the control PSC with only AgAl electrode. Furthermore, the hysteresis effect of PSCs with LiF modified AgAl and Au composite NPs can be neglected compared to the control cells without NPs and LiF spacer. In the meanwhile, carrier transport and collection probabilities of PSCs with AgAl and Au composite NPs were increased to 96.86% from 89.51% in control cells, indicating the improved electron transport and extraction ability. The enhanced PCEs of PSCs with AgAl(3 nm)/Au(2 nm)/LiF(1 nm) are attributed to the improved light absorption of perovskite layer and the reduced contact barrier at metal electrode, which can be supported with its enhanced photon-to-electron conversion efficiency (△IPCE) and the disappeared negative capacitive behavior. Furthermore, the obviously reduced work function values of AgAl-Au composite NPs and AgAl metal electrode after LiF modification were observed with ultraviolet photoelectron spectroscopy spectra. Our results indicate that thermally evaporating a ultra-thin LiF spacer can well inhibit the energy dissipation of plasmon effects of AgAl-Au composite NPs and reduce the contact barrier between PCBM and AgAl metal electrode, which is an efficient strategy to achieve efficient plasmon-enhanced perovskite solar cells .
研究领域:
光伏技术
·
纳米材料
·
等离激元学
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太阳能
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 8.3
Jing Pan,Yongde Yan,Yanghai Zheng,Shengrong Guo,Xuepeng Wang,Sihao Wang,Zhiguang Du,Kaijie Wang,Yun Xue,Kai Zhu
A method for the preparation of LaNi 5 alloy by molten salt co-reduction is reported. The electrochemical co-reduction process of La(III) and Ni(II) as well as the reaction process of intermetallic compounds formation were investigated. It was confirmed that the diffusion coefficient of La(III) in LiF–CaF 2 molten salt is 4.684–8.098 × 10 −5 cm 2 s −1 at temperatures of 1113–1183 K. And the reaction activation energy was obtained to be 78.86 kJ mol −1 . And, the exchange current densities of La(III)/La(0) were determined by the Tafel (0.149–0.251 A cm −2 ) and linear polarization (0.143–0.204 A cm −2 ) methods. Furthermore, five different La–Ni intermetallic compounds were detected by studying the co-reduction reaction of La(III) and Ni(II) ions. Meanwhile, the formation potentials of La–Ni intermetallic compounds were defined by various electrochemical tests. In addition, the LaNi 5 alloy was obtained via potentiostatic electrolysis according to the electrochemical results. This study provides new insights into the electrochemistry of the LiF–CaF 2 –LaF 3 –NiF 2 molten salt and enhances the understanding of the molten salt electrolytic preparation of La–Ni alloys from co-reduction.
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高影响因子
危险品化学品经营许可证（带存储）