JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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
·
能源存储
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DOI
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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DOI
RSC Advances
·
2015
·Vol. 5
·期 58
·46480-46484
·
IF 3.84
Dikai Xu,Xuegong Yu,Lijian Zuo,Deren Yang
Graphene–silicon (Gr–Si) Schottky junction solar cells have recently attracted intensive attention as candidates for low-cost photovoltaic devices. However, the efficiency of Gr–Si solar cells still needs further improvement. In this study, we have introduced an ultra-thin LiF layer between the Si and aluminum (Al) back electrode of Gr–Si solar cells. It is found that carrier recombination at the back surface is significantly suppressed, resulting directly in the improvement of external quantum efficiency (EQE) of devices in the long wavelength range of 800–1100 nm. Moreover, the back contact resistance is greatly reduced, and therefore the fill factor (FF) of devices is greatly improved. As a result, the highest power conversion efficiency (PCE) of 6.25% has been obtained for a pristine Gr–Si solar cell, which is further improved to 10.61% after chemical doping. These results pave a new way to the fabrication of high efficiency Gr–Si solar cells.
研究领域:
光伏技术
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材料科学
·
纳米技术
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半导体器件
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·Vol. 143
·期 21
·e70710
·
IF 3.1
Lingyi Kong,Zhenjiang Du,Beili Pang,Can Cui,Jianguang Feng,Hongzhou Dong,Lingyan Wang,Liyan Yu,Lifeng Dong
Poly(vinylidene fluoride) (PVDF)-based polymer electrolytes are promising candidates for lithium-ion batteries due to their high ionic conductivity, wide electrochemical stability window, and ease of processing. However, PVDF chain scission during cycling often leads to battery failure. This study introduces a straightforward strategy for modifying PVDF using potassium oxalate (K 2 C 2 O 4 ). The resulting composite gel polymer electrolyte (CGPEK-X) facilitates the pre-formation of LiF, which enhances lithium-ion conductivity and promotes uniform lithium deposition. Moreover, the improved mechanical integrity of the composite effectively suppresses lithium dendrite growth. When integrated into LiFePO 4 /Li cells, the optimized K 2 C 2 O 4 -doped system demonstrates stable cycling over 200 cycles at room temperature, achieving a discharge capacity of 120.3 mAh g −1 at 1°C. This work presents a novel approach to engineering PVDF-based electrolytes with balanced mechanical and electrochemical properties, offering valuable insights for the development of high-performance lithium-polymer batteries.
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2025
·
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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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qianxiao Fan,Wendi Zhang,Yilong Jin,Dongmei Zhang,Xianglong Meng,Wanxiong Peng,Jinhui Wang,Jinshan Mo,Kai Liu,Lehao Liu,Meicheng Li
All-solid-state lithium batteries employing sulfide solid electrolyte are promising candidates for next generation lithium batteries. Nevertheless, the unstable interface of sulfide solid electrolyte and Li metal has limited the lifespan of sulfide solid state lithium metal batteries. Herein, a composite protection layer composed of Li-Ag/LiF (LAF) is formed on Li metal surface by the in-situ reaction of silver-fluoride (AgF) and Li metal to solve the instability issue of the Li 6 PS 5 Cl/Lithium interface. The Li-Ag particles act as nucleation sites for Li deposition and LiF can avoid the growth of lithium dendrites. The density function theory (DFT) calculation results show the lithiophilic of Li-Ag alloys and high interfacial energy of LiF/Li 6 PS 5 Cl interface, proving the superiority of the LAF protection layer. The critical current density of the Li-LAF/ Li 6 PS 5 Cl/ LAF-Li symmetric battery is 1.6 mA cm −2 and the battery achieved a long lifespan of over 3000 h at 0.1 mA cm −2 and 0.1mAh cm −2 at room temperature. In addition, a high discharge capacity of 139.1mAh/g is obtained in the LiNbO3@LiCoO2/ Li6PS5Cl/ LAF-Li full cell. This work provides a feasible strategy for the interface modification of sulfide all-solid-state Li metal batteries.
研究领域:
材料科学
·
储能技术
·
电化学
·
固态电池
·
纳米材料
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DOI
高影响因子
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
·
生物医学工程
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DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 24
·2964-2970
·
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
·
植物化学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
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
·
电化学
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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
·
锂离子电池
·
固态化学
·
表面工程
·
电池材料
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hexin Guo,Yao Tian,Yuanming Liu,Yu Bai,Junru Wu,Feiyu Kang,Baohua Li
Fast-charging lithium-ion batteries (LIBs) have been severely hampered by the slow development of their electrolytes. Herein, we demonstrate that the size effect of solvent sheath would pose a great effect on the fast-charging performance of LIBs. Three similar ethers, including diethyl ether (DEE), dipropyl ether (DPE), and dibutyl ether (DBE), were mixed with 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) and lithium bis(fluorosulfonyl)imide (1 M) to form an electrolyte for fast-charging LIBs, respectively. The results showed that it is more difficult to form ternary graphite intercalation compounds (GICs) in the electrolyte with a larger solvation sheath. The DEE electrolyte can form stable GICs and generate an inner LiF-rich solid electrolyte interphase (SEI), lowering the diffusion barrier of Li+. Therefore, the graphite anode powered by the DEE electrolyte can maintain a capacity of 190 mAh g–1 at 4 C after 500 cycles. This kind of size effect of solvation sheath is also applicable to lithium metal batteries.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Changyong Zhao,Hanyan Wu,Xuejie Gao,Chen Cheng,Shuiping Cai,Xiaofei Yang,Runcang Sun
Challenges associated with lithium dendrite growth and the formation of dead lithium significantly limit the achievable energy density of lithium metal batteries (LMBs), particularly under high operating current densities. Our innovative design employs a state-of-the-art 2500 separator featuring a meticulously engineered cellulose acetate (CA) coating (CA@2500) to suppress dendrite nucleation and propagation. The C O functional groups in CA enhances charge transfer kinetics and triggering the decomposition of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), which leads to the formation of a more robust solid electrolyte interphase (SEI) composed primarily of LiF. Moreover, the introduction of polar functional groups in the CA enhances the separator’s hydrophilic properties, facilitating the uniform Li + flux and creating a conductive pathway for efficient lithium migration. As a result, the CA@2500 separator exhibits a high lithium-ion transfer number (0.88) and conductivity. The lithium symmetric cell assembles with the CA@2500 separator displays a stable cycling performance over 5500 h at a current density and capacity of 10 mA cm −2 and 10 mAh cm −2 , respectively. Additionally, LPF battery with CA@2500 separator shows an excellent capacity retention at 0.2 C with an average decay of 0.055 % per cycle. Moreover, a high capacity of 105 mAh g −1 is maintained after 500 cycles at 5 C with an average decay of only 0.027 % per cycle. This work achieved high stability of LMBs through simplified engineering.
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）