ANALYTICAL BIOCHEMISTRY
·
2021
·
IF 3.365
Xiao Yu,Wanxiang Yu,Xiaohui Zhang,Yongjie Wang,Shumei Wang,Haiyun Zhai
Based on advantages of capillary electrophoresis (CE), a new solid-phase extraction (SPE) coupled with CE has been developed for preconcentration , enrichment and determination of anthraquinones and flavonoids (rutin, emodin , quercetin , 1,8-dihydroxyanthraquinone) in honey. The environmental-friendly chitin activated after an easy processing is selected as the adsorbent to enrich analytes. Then, chitin was filled into the filter as the solid phase. To improve the extraction effect, some key parameters of extraction were optimized. Under the optional extraction conditions, the chitin showed excellent adsorption capacity and selectivity over rutin , emodin, quercetin, and 1,8-dihydroxyanthraquinone, with enrichment factors reaching 5 folds. The CE coupled with fluorescence detection was used for the detection. Results prove the method is simple, fast, and highly sensitive, with the limit of detection (LOD) is 3.00–200.0 ng/mL; the recovery is 90.0–107.0%, and relative standard deviation of (RSD) is 1.8–8.3%.
研究领域:
分析化学
·
食品科学
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Carbon Energy
·
2024
·
IF 19.5
Qihang Ding,Zewen Jiang,Kean Chen,Hui Li,Jingzhe Shi,Xinping Ai,Dingguo Xia
High-voltage LiCoO 2 (LCO) can deliver a high capacity and therefore significantly boost the energy density of Li-ion batteries (LIBs). However, its cyclability is still a major problem in terms of commercial applications. Herein, we propose a simple but effective method to greatly improve the high-voltage cyclability of an LCO cathode by constructing a surface LiF modification layer via pyrolysis of the lithiated polyvinylidene fluoride (Li-PVDF) coating under air atmosphere. Benefitting from the good film-forming and strong adhesion ability of Li-PVDF, the thus-obtained LiF layer is uniform, dense, and conformal; therefore, it is capable of acting as a barrier layer to effectively protect the LCO surface from direct exposure to the electrolyte, thus suppressing the interfacial side reactions and surface structure deterioration. Consequently, the high-voltage stability of the LCO electrode is significantly enhanced. Under a high charge cutoff voltage of 4.6 V, the LiF-modified LCO (LiF@LCO) cathode demonstrates a high capacity of 201 mA h g −1 at 0.1 C and a stable cycling performance at 0.5 C with 80.5% capacity retention after 700 cycles, outperforming the vast majority of high-voltage LCO cathodes reported so far.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Bing Liu,Lei Li,Kai Xin Song,Min Min Mao,Zhilun Lu,Ge Wang,Linhao Li,Dawei Wang,Di Zhou,Antonio Feteira,Ian M. Reaney
LiF is a low-firing fluoride with excellent microwave dielectric properties , however densification of LiF ceramics is challenging owing to their low surface free energy. In this study, a cold sintering process (150 °C, 250 MPa, 60 min) was employed to pre-densify LiF ceramics to 78 % relative density. Post-annealing treatments between 650 °C and 800 °C led to significant grain growth which was accompanied by an increase in relative density to 92 %. The microwave quality factor ( Qf ) increased with increasing annealing temperature to a maximum of 110,800 GHz at 800 °C, 1.5 times higher than the value obtained via conventional sintering (78,800 GHz), with relative permittivity ε r = 8.2 and temperature coefficient of resonant frequency, τ f =–135 ppm/°C. Such high values of Qf and its compatibility with Ag electrode suggest that cold sintered LiF has great potential as a component or additive in low temperature co-fired ceramic formulations.
研究领域:
材料科学
·
陶瓷工程
·
微波工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chengzhou Tao,Tianle Zheng,Pengfei Jia,Wuze Gong,Guma Yila,Lina Wang,Tianxi Liu
Hindered by the high diffusion energy barrier of Li+ in graphite anode layers, the low-temperature application of traditional Li-ion batteries is limited. Lithium metal without intercalation and with excellent specific capacity is expected to support battery operation at low temperatures. However, due to the low conductivity, high freezing point, and strong solvation energy of traditional carbonate electrolytes, the application of lithium–metal batteries at low temperatures remains challenged. In this paper, an all-ester-based ternary solvent electrolyte based on fluorinated carbonate and methyl acetate is developed to improve the cyclic efficiency of the Li-metal anode at subzero temperatures. Methyl acetate, with low viscosity and low freezing point, endows Li+ with efficient transfer in the bulk phase at low temperatures. Fluorinated cosolvent regulates the solvation structure, thereby facilitating Li+ desolvation while forming a LiF-rich solid electrolyte interphase. The electrolyte exhibits good compatibility with the Li-metal anode, as confirmed by the significantly reduced kinetic barrier of Li+ diffusion at the interface. The theoretical calculations suggest that anions occupy the dominant positions within the inner solvation sheath. The in situ/ex situ characterizations provide straightforward evidence of a dendrite-free Li-metal electrode during cycling. As a result, the symmetric Li||Li cell is able to cycle stably for thousands of hours at current densities of 0.5 mA cm–2 and 1 mAh cm–2. When paired with a LiFePO4 cathode, the battery at 0.2 C (1 C = 170 mA g–1) has a capacity retention of 95.4% after 200 cycles at −15 °C and 92.6% after 100 cycles at −20 °C, respectively.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiaoyu Chen,Chenlong Hao,Mengyao Shang,Xiangxin Li,Shuo Wang,Wenming Zhang
Manganese based oxides have significant potential as cathode materials for potassium ion batteries (PIB). Unfortunately, the practical application of manganese-based oxides is hindered by severe electrode surface erosion from electrolyte decomposition products and material expansion and collapse during potassium ion intercalation. Consequently, the surface modification strategy is adopted herein to uniformly cover the surface of K 0.27 MnO 2 ·0.54 H 2 O (KMO) microspheres with LiF/Li x PF y O z coating to effectively protect the electrode surface and significantly inhibit the collapse of the material crystal structure. Additionally, the coating exhibits excellent electron/ion conductivity, enhancing the diffusion efficiency of potassium ions within the electrode material. The existence of LiF/Li x PF y O z coating is confirmed by characterization measurements. The LiF/Li x PF y O z -coated KMO microspheres (sample LLO@KMO-2) exhibit outstanding cyclic stability (66.3 % capacity retention at 50 mA g −1 ) and high discharge capacity (100.2 mAh g −1 at 50 mA g −1 ), demonstrating their excellent cycle stability. The modification strategy of LiPF 6 -electrolyte-solvothermal coating provides an innovative surface modification method for potassium ion batteries , showcasing its potential for application in future high-performance battery technologies.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Songtao Long,Fang Chen,Fei Ding,You Han,Xingjiang Liu,Qiang Xu
The Li/CFx primary battery with the highest energy density has been widely applied in many fields. However, the Li/CFx battery has been suffering from some problems for large-scale applications, such as low energy density, which needs to be overcome urgently. Among the technical solutions, the modification of the discharge product layer is an effective approach to solve the problem. To adjust the pore structure of the discharge product layer, it is necessary to explore both the growth and the orientation kinetics of LiF crystals as the main discharge product of Li/CFx batteries. In this work, the growth kinetics of the LiF crystal during discharge in dimethyl sulfoxide/1,3-dioxolane (DMSO/1,3-DO)-based electrolytes is first explored by kinetic models of crystal growth. The calculated results show that the nucleation and nuclei growth mechanism is best suited for the growth kinetics of the LiF crystal in the DMSO/1,3-DO (5:5 v/v)-based electrolyte, which is different from the 2D diffusion mechanism of the LiF crystal in the PC/DME (5:5 v/v). Then, the orientation kinetics of LiF crystals is investigated by using quantum-chemical calculations. The simulation results reveal that the total chemical adsorption energies of both DMSO and 1,3-DO solvent molecules on the crystal planes of LiF could change with the ratio variation of DMSO/1,3-DO. The preferred crystal orientation growth of the LiF grain during discharge mainly depends on the total chemical adsorption energy on each crystal plane of LiF, which is caused by the selective adsorption of both DMSO and 1,3-DO on different crystal planes. The study of the growth kinetics of LiF grains and the preferred orientation growth can help our understanding of the structure control mechanism of discharge products of LiF. In general, this work may pave the way for the future development of a novel electrolyte of the large-capacity Li/CFx battery with high power density.
研究领域:
材料科学
·
电化学
·
电池技术
·
晶体学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 24
·2300494
·
IF 13.3
Tianqi Yang,Wenkui Zhang,Jiatao Lou,Huanming Lu,Yang Xia,Hui Huang,Yongping Gan,Xinping He,Yao Wang,Xinyong Tao,Xinhui Xia,Jun Zhang
Lithium-rich layered oxide (LRLO) materials have attracted significant attention due to their high specific capacity, low cost, and environmental friendliness. However, owing to its unique capacity activation mechanism, the release of lattice oxygen during the first charge process leads to a series of problems, such as severe voltage decay, poor cycle stability, and poor rate performance. Herein, a fluorinated quasi-solid-state electrolyte (QSSE) via a simple thermal polymerization method toward lithium metal batteries with LRLO materials is reported. The well-designed QSSE exhibits an ionic conductivity of 6.4 × 10 −4 S cm −1 at 30 °C and a wide electrochemical stable window up to 5.6 V. Most importantly, XPS spectra demonstrate the generation of a LiF-rich electrode–electrolyte interface (EEI), where the in situ generated LiF provides strong protection against the structural degradation of LRLO materials and directs the uniform plating/stripping behaviors of lithium-ions to inhibit the formation of lithium dendrites. As a result, LRLO/QSSE/Li batteries exhibit excellent rate performance and demonstrate a large initial capacity for 209.7 mA h g −1 with a capacity retention of 80.8% after 200 cycles at 0.5C. This work provides a new insight for the LiF-rich EEI design of safe, high-performance quasi-solid-state lithium metal batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ELECTROPHORESIS
·
2016
·Vol. 37
·期 14
·2097-2105
·
IF 2.482
Ya-Jun Duan,Li-Yun Zhang,Xiao-Feng Guo,Hong Wang
A rapid and robust CE method using a long wavelength fluorescent reagent 1,7-dimethyl-3,5-distyryl-8-phenyl-(2-maleimide)difluoroboradiaza- s -indacene as the labeling reagent has been developed for the simultaneous determination of thiols, including glutathione, cysteine, homocysteine, N -acetylcysteine, cysteinylglycine, and penicillamine. The derivatization reaction was carried out in 14 mmol/L pH 8.5 borate buffer at 30°C for 6 min and the labeled thiols derivatives were separated with the running buffer containing 30 mmol/L pH 7.4 phosphate, 30% v/v acetonitrile and 8 mmol/L SDS within 12 min. Detection limits ranged from 0.4 to 2.4 nmol/L. To demonstrate the capability of this method, it was applied to the analysis of thiols in human urine with recoveries of 92.4–105.6%. The derivatization reaction was much faster at milder conditions, and the analysis was rapider. Moreover, with excitation wavelength at long wavelength region, background interference from samples was reduced effectively. The present method seems to be a potential choice for quantifying thiols in human urine.
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yue Lei,Xin Xu,Junying Yin,Jianping Xu,Kang Xi,Lai Wei,Haihua Wu,Sen Jiang,Yunfang Gao
Commercial Li-ion batteries use LiPF6-based carbonate electrolytes extensively, but there are many challenges associated with them, like dendritic Li growth and electrolyte decomposition, while supporting the aggressive chemical and electrochemical reactivity of lithium metal batteries (LMBs). This work proposes 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFM) as a multifunctional electrolyte additive, constructing protective solid-/cathode-electrolyte interphases (SEI/CEI) on the surfaces for both lithium metal anode (LMA) and Ni-rich cathode to solve these challenges simultaneously. The highly fluorinated group (−CF3) of the HFM molecule contributes to the construction of SEI/CEI films rich in LiF that offer excellent electronic insulation, high mechanical strength, and surface energy. Accordingly, the HFM-derived LiF-rich interphases can minimize the electrolyte–electrode parasitic reactions and promote uniform Li deposition. Also, the problems of LiNi0.8Co0.1Mn0.1O2 particles’ inner microcrack evolution and the growth of dendritic Li are adequately addressed. Consequently, the HFM additive enables a Li/LiNi0.8Co0.1Mn0.1O2 cell with higher capacity retention after 200 cycles at 1 C than the cell with no additive (74.7 vs 52.8%), as well as a better rate performance, especially at 9 C. Furthermore, at 0.5/0.5 mAh cm–2, the Li/Li symmetrical battery displays supersteadfast cyclic performance beyond 500 h when HFM is present. For high-performance LMBs, the HFM additive offers a straightforward, cost-effective route.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Biwu Cai,Jianbang Ge,Zichen Zhang,Yang Gao,Shun Cao,Zhihao Cheng,Xin Lu,Shuqiang Jiao
Understanding mass transfer is of great importance to molten salt electrochemistry. However, natural convection has long been neglected in electrochemical measurements in stagnant molten salt systems due to the complex mathematical treatments. Here we reported the notable natural convection effects in molten LiF-NaF-KF during cyclic voltammetry and chronoamperometry tests. The established model showed that the convection-diffusion layer (CDL) convection dominated mass transfer under long time-scale tests in molten LiF-NaF-KF-EuF 3 . However, in the case of molten LiF-NaF-KF-K 2 TiF 6 , CDL convection predominated at dilute redox concentrations while density-driven convection came into dominance at high redox concentrations, because of the severe coordinate structure change of the redox couple. The derived thickness of the convection-diffusion layer, δ c o n v . , ranged from 135 to 183 μm, much higher than that in aqueous solutions (220–250 μm). Moreover, the increase in system temperature greatly enhanced natural convection effects in molten fluorides. Lastly, the use of microelectrode (re<39.7 μm for δ c o n v . =160 μm) was demonstrated to be an effective way to suppress the intense natural convection effects.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2021
·Vol. 19
·期 1
·480-487
·
IF 1.968
Hai-Tao Zhou,Zhe-Nan Xu,Jian-Yun Yan,Hao Huang,Yan-Bo Guo,Kang Du,Wen-Zhong Lu,Wen Lei
In the present study, (1 − x )BaAl 2 Si 2 O 8 − x CaSnSiO 5 − y wt.% LiF microwave dielectric ceramics were prepared through the traditional solid-state sintering at 950−1395°C for 5 h. The BaAl 2 Si 2 O 8 phase could coexist with the CaSnSiO 5 phase at (1 − x )BaAl 2 Si 2 O 8 − x CaSnSiO 5 (.2 ≤ x ≤ .6) ceramics, and no other secondary phase was observed. The CaSnSiO 5 , as a τ f regulator, adjusted the negative τ f value of BaAl 2 Si 2 O 8 to near zero. Excellent microwave dielectric properties ( ε r = 8.1, Q × f = 37 560 GHz, and τ f = −1.5 ppm/°C) were obtained from the 0.6BaAl 2 Si 2 O 8 −0.4CaSnSiO 5 ceramic. The sintering temperature of 0.6BaAl 2 Si 2 O 8 −0.4CaSnSiO 5 ceramic decreased from 1375°C to 950°C by introducing 2 wt.% LiF. The 0.6BaAl 2 Si 2 O 8 −0.4CaSnSiO 5 −2 wt% LiF ceramic exhibited remarkable microwave dielectric properties ( ε r = 7.6, Q × f = 17 420 GHz, and τ f = −12.2 ppm/°C) and could be applied to the low-temperature co-fired ceramic (LTCC) field.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 30
·2404815
·
IF 27.4
Yi-Hong Tan,Zhu Liu,Jian-Hui Zheng,Zhi-Jin Ju,Xiao-Ya He,Wei Hao,Ye-Chao Wu,Wen-Shan Xu,Hao-Jie Zhang,Guo-Qing Li,Li-Sha Zhou,Fei Zhou,Xinyong Tao,Hong-Bin Yao,Zheng Liang
The solid electrolyte interphase (SEI) with lithium fluoride (LiF) is critical to the performance of lithium metal batteries (LMBs) due to its high stability and mechanical properties. However, the low Li ion conductivity of LiF impedes the rapid diffusion of Li ions in the SEI, which leads to localized Li ion oversaturation dendritic deposition and hinders the practical applications of LMBs at high-current regions (>3 C). To address this issue, a fluorophosphated SEI rich with fast ion-diffusing inorganic grain boundaries (LiF/Li 3 P) is introduced. By utilizing a sol electrolyte that contains highly dispersed porous LiF nanoparticles modified with phosphorus-containing functional groups, a fluorophosphated SEI is constructed and the presence of electrochemically active Li within these fast ion-diffusing grain boundaries (GBs-Li) that are non-nucleated is demonstrated, ensuring the stability of the Li || NCM811 cell for over 1000 cycles at fast-charging rates of 5 C (11 mA cm −2 ). Additionally, a practical, long cycling, and intrinsically safe LMB pouch cell with high energy density (400 Wh kg −1 ) is fabricated. The work reveals how SEI components and structure design can enable fast-charging LMBs.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）