Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 14
·9124-9133
·
IF 12.732
Guoping Liu,Lei Zhang,Yucun Zhou,Luke Soule,Yangchang Mu,Wenwu Li,Zhicong Shi
Designing a novel anode material with suitable elemental composition and bonding structure for improving the limited capacity and poor lithium-ion conductivity of lithium-ion batteries (LIBs) is still challenging. Here, guided by first-principles calculations, we report a higher crystal symmetric, cation-disordered zinc blende Zn0.5Ge0.5P anode material with high-capacity and high-rate capability owing to superior electron and lithium-ion transport compared to the parent allotrope chalcopyrite ZnGeP2. The Zn0.5Ge0.5P anode exhibits a large specific capacity of 1435 mA h g−1 with a high initial Coulombic efficiency of 92%. An amorphization–conversion–alloying reaction mechanism is proposed based on ex situ characterizations including X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. During lithiation, the material phase-changes through Li3P, LiZnGe, β-Li2ZnGe, and α-Li2ZnGe intermediates that provide suitable transport channels for fast diffusion of lithium ions. During delithiation, LiZn, Li15Ge4, and Li3P nanoparticles reassemble into Zn0.5Ge0.5P. A Zn0.5Ge0.5P–TiC–C composite with finer particle size and enhanced electronic conductivity exhibits an initial specific capacity of 1076 mA h g−1 and a capacity retention of 92.6% after 500 cycles.
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高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Chang Su,Lingmin Wang,Lihuan Xu,Cheng Zhang
A novel ferrocene-contained pyrrole, 4-(1H-pyrrol-1-yl) phenyl ferrocenecarboxylate (FcPy) was synthesized by esterification of 4-(1H-pyrrol-1-yl) phenol (PLPY) and ferrocenecarboxylic acid. Then the homopolymer of FcPy (PFcPy), copolymer of FcPy and pyrrole (P(FcPy-co-Py)), polypyrrole (PPy) were prepared by chemical oxidative polymerization. And the structure, morphology, electrochemical properties of prepared polymers were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), cyclic voltammograms (CV) and electrochemical impedance spectra (EIS), respectively. Also, the charge/discharge properties of the prepared polymers were studied by galvanostatic charge–discharge testing. The results demonstrated that the introduction of ferrocene to polypyrrole obviously improved the specific capacity of PPy cathode and gave a well-defined plateau at the potential rang of about 3.5 V. Under our experimental conditions, the discharge capacity of undoped PPy-based electrodes only presented 16.5 mAh g −1 at 20 mA g −1 between 2.5 and 4.2 V, while PFcPy-based electrodes exhibited an initial discharge capacity of up to 43.2 mAh g −1 . Specially, the P(FcPy-co-Py)-based electrodes even showed a discharge capacity of 68.1 mAh g −1 and the improved discharge platform, which were ascribed to the resonance doping effect of pendant group, the advanced electrochemical nature of ferrocene moiety and the loose morphology of copolymer.
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ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Jipeng Jing,Lihua Lin,Kaiyu Yang,Hailong Hu,Tailiang Guo,Fushan Li
Zinc oxide (ZnO) is widely used as an electron transport layer (ETL) in quantum dot light-emitting diodes (QLED) because of its advantages of appropriate energy level and the simple process at low temperature. However, its high conductivity and abundant surface defects have become essential factors limiting the development of QLED. Here, we employ sol-gel derived lithium (Li)-doped ZnO (LZO) film as an ETL for inverted red QLED to achieve low-cost and high-efficiency QLED. We show that the conduction band minimum, the density of oxygen defects and conductivity of ZnO can be tuned by Li-doping. Consequently, the red QLED with 3 wt% Li-doped ZnO ETL exhibit maximum external quantum efficiency (EQE) and current efficiency of 16.4% and 24.1 cd/A, respectively, which are about 1.3-fold greater than those of the device with ZnO ETL. The Li-doping in sol-gel derived ZnO provides a feasible strategy for low-cost and high-performance inverted QLEDs.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Changsheng Guo,Nan Li,Xiaoming Qian,Jie Shi,Miaolei Jing,Kunyue Teng,Zhiwei Xu
To explore nanofiltration (NF) membrane with high permeability and good separation for Li + from salt-lake, a triple-layered ultra-thin double Janus NF membrane was prepared with polyethersulfone (PES) substrate membrane, a carboxylated cellulose nanocrystal (CNC-COOH) interlayer and an ultra-thin polyamide (PA) layer via interfacial polymerization of polyethylenimine and trimesoyl chloride. The interlayer contain a large number of carboxyl groups, which could improve not only the negative potential of interlayer, but also the positive potential of the PA layer because of the increase of unreacted NH 2 . In addition, the hydrophilic of interlayer was stronger than the PA layer. Therefore, the interlayer and the ultra-thin PA layer could construct a double Janus NF membrane with hydrophobic/hydrophilic, positive/negative charge. It was found that the content of carboxyl groups and unreacted amino groups on the surface of Janus PES/CNC-COOH/PA NF membrane was increased obviously. The thickness of Janus NF membrane PA layer was 60.29 nm, 55.56% thinner than that in traditional PES/PA NF membrane and 25.89% thinner than that in weak Janus PES/cellulose nanocrystal/PA NF membrane. The Janus NF membrane had a minimum average surface roughness of 6.21 nm, an effective pore diameter of 1.38 nm, and exhibited a positive surface charge with a highly hydrophilic nature. Under the Mg 2+ /Li + ratio of 30 and 60, the Janus NF membrane exhibited the rejection difference between Mg 2+ and Li + reached to 74.35% and 83.96%, the water flux was 4.17 and 3.4 L/(m 2 ·h·bar), respectively, and the separation factor S Li,Mg was 12.15 and 5.84, respectively.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Weichen Xu,Xiaomeng Li,Hong Wang,Fuliang Wang,Shouqiang Han,Jing Guo
Microwave dielectric ceramics are critical components in wireless communications. However, it is still a challenge to develop microwave dielectric ceramics with reduced sintering temperatures, high thermal stabilities and good dielectric properties at the same time. Herein, the entropy value, which is able to modulate the grain boundary energy and adjust the inherent sintering temperature, is engineered to develop high-performance microwave dielectric ceramics with low sintering temperatures. The structure-property relationships of AWO 4 ceramics, including (NaCaBi) 1/3 WO 4 , (NaCaSrBi) 1/4 WO 4 , (NaLiCaBiSm) 1/5 WO 4 and (NaLiCaSrBiSm) 1/6 WO 4 with increased entropy values are investigated systematically. X-ray diffraction and high-resolution TEM analyses confirm the formation of single-phase solid solutions with the tetragonal scheelite structure in AWO 4 ceramics. As the number of elements in the A-site varies, the relative permittivities, Q × f values and TCF values shift in the range of 12.2–16.5, 8,000–25,000 GHz and −32.3–31.6 ppm/°C, respectively. Simultaneously, the high-entropy samples demonstrate the lowest sintering temperature of 750 °C among the four formulations. Phillips-Van Vechten-Levine (PVL) complex chemical bond theory reveals that the covalency, lattice energy and bond energy affect the relative permittivity, Q × f value and TCF value, respectively. Raman spectra suggest that high entropy value leads to increased disorder, and infrared reflectivity spectra illustrate that the dielectric response is dominated by polarized optical phonons of [WO 4 ] tetrahedron. It is anticipated that entropy design will facilitate the development of microwave dielectric ceramics in low temperature co-fired ceramic applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhihua Zhang,Xiao Du,Zheng Zhang,Qinglong Luo,Zhonglin Zhang,Jun Li,Xiaogang Hao
Because of its excellent stabilities, polyvinylidene fluoride (PVDF) is commonly employed as a binder in electrode fabrication. However, poor adhesion and hydrophilicity limit its applicability. Herein, PVDF as the hydrophobic framework, polyacrylic acid (PAA), and carboxymethylcellulose lithium (CMCLi) composite binders were cross-linked with phytic acid and Li 1-x Mn 2 O 4 /C were used in the formulation. After 100 electrochemical cycles, the film electrode Li 1-x Mn 2 O 4 /C/PAA- c -CMCLi- b -PVDF exhibits excellent adhesion (0.93 N cm −1 ) and a low capacity fading rate (8.2 %). Furthermore, this film electrode demonstrated a high intercalation capacity (32.14 mg g −1 ), a short intercalation equilibrium time (within 2 h), and a fast Li + intercalation rate, which can be attributed to the synergistic effect of electrolyte permeability enhanced by hydrophilic functional groups (–OH and –COOH), dispersibility of electrode material particles improved by high slurry rheology, and the high transport efficiency of –COOH for Li + . These promising results suggest that this double cross-linked Li 1-x Mn 2 O 4 /C/PAA- c -CMCLi- b -PVDF film electrode is suitable for the selective extraction of Li + .
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 34
·e202200543
·
IF 5.02
Zhuoran Ao,Youlan Zou,Haiyan Zou,Yuxing Huang,Nantao Chen
Graphical PEO-based Double-layer solid electrolyte was fabricated through casting method. PVP distributed into PEO layer contacting with cathode promotes the dissolution of lithium salts and forms lithium bonds with (LiPSs). The double-layer solid electrolytes can ameliorate the shuttle effect of LiPSs better than pure PEO electrolytes. Despite the high specific capacity of Li−S battery, shuttle effect of lithium polysulfides (LiPSs) and safety issue pose a great challenge to realize its commercial application. Replacing liquid electrolyte with poly (ethylene oxide) (PEO) -based solid-state electrolyte is considered as a promising method to boost the safety, but the shuttle effect of LiPSs cannot be completely eliminated. In this work, a new kind of double-layer PEO-based polymer electrolyte is designed to restrict the LiPSs. The layer next to cathode consists of PEO and poly(vinylpyrrolidone) (PVP). The other layer consists of PEO. PVP with abundant of amide groups has been proved to have strong affinity to LiPSs. The strong interaction between LiPSs and carbonyl groups in amide is verified by Attenuated Total Reflection-Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy tests. As a result, the assembled Li−S battery exhibits a specific capacity of 1100 mAh g −1 and capacity retention of 347 mAh g −1 after 200 cycles at 60 °C and 0.05 C, while the capacity retention of the battery without PVP-blended PEO electrolyte remains only 27 % at the same conditions.
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PubMed
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 10
·2642-2656
·
IF 4.912
Hailong Wu,Jiali Wang,Yu Zhao,Xiaoqiang Zhang,Ling Xu,Hao Liu,Yixiu Cui,Yanhua Cui,Chilin Li
Easy processing and flexibility make polymer electrolytes very promising in the field of all-solid-state Li metal batteries. However, their low room-temperature conductivity and poor mechanical properties hinder their application. Herein, methyl 2-hydroxyethyl cellulose (HEMC), an organic filler, was used to reinforce the PEO-based polymer electrolyte instead of traditional inorganic or ceramic fillers. PEO–LiTFSI–HEMC with a 20 wt% HEMC filling enables the highest ion conductivities of 1.30 × 10−4 S cm−1 at 30 °C and 1.68 × 10−3 S cm−1 at 60 °C with an increased Li-ion transference number (0.467), by providing multi-dimensional Li-ion transport channels at the cross-linking network interface between PEO and HEMC (also with ethylene oxide groups to dissociate Li-salt), as well as excess protonated branched groups in HEMC to attract more TFSI− anions. This organic filler also promotes the amorphization of the PEO structure and the mechanical strengthening of the polymer skeleton, characterized by Young's modulus of 46.95 MPa and tensile strength of 3.26 MPa. The porous texture in the polymer enables good anode-electrolyte interface compatibility due to the facile compaction at the 3D contact interface, which is favorable for the achievement of ultrastable Li plating/stripping cycling for at least 1000 cycles with an overpotential as small as 75 mV. The anode dendrite suppression endows Li|PEO16–LiTFSI–20HEMC|LiFePO4 all-solid-state cells with long-term cycling (∼120 mA h g−1 at 1C for at least 300 cycles) and high-rate performance (80 mA h g−1 up to 2C). The widened electrochemical stability window (up to 5.56 V) is expected to improve the reversibility of higher voltage cathodes.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 15
·9581-9585
·
IF 12.732
Yuemin Du,Yijie Liu,Sixie Yang,Chao Li,Zhu Cheng,Feilong Qiu,Ping He,Haoshen Zhou
The fossil fuel crisis and global warming are becoming more and more severe in this century, while the exploration of human survival on Mars is being pushed forward steadily. Hence, it is meaningful to effectively utilize CO2, the main greenhouse gas and a major component of the Martian atmosphere. Due to their high capacity and ability to capture CO2, Li–CO2 batteries have received much attention. However, there are problems that still need to be solved relating to Li–CO2 batteries, including the instability of the electrolyte and the non-negligible polarization caused by the formation and decomposition of Li2CO3. To address these issues, an all-solid-state Li–CO2 battery, which uses RuO2 nanoparticles combined with single-walled carbon nanotubes (SWCNTs) as the cathode material and a sodium super ionic conductor (NASICON)-type ceramic solid electrolyte, Li1.5Al0.5Ge1.5(PO4)3 (LAGP), has been developed and it operates over a broad temperature range. Under a pure CO2 atmosphere, this well-designed battery shows a discharge capacity of 2499 mA h g−1 and a charge capacity of 2137 mA h g−1 in the first cycle at 60 °C, and stable cycling performance over 30 cycles under a capacity limitation of 500 mA h g−1 at a current density of 50 mA g−1. This result enhances the possibility of the utilization of the Li–CO2 battery in the future.
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高影响因子
Materials
·
2020
·Vol. 13
·期 7
·1719
·
IF 3.057
Qinghui Li,Chang Xu,Bing Huang,Xin Yin
NASICON-type solid electrolytes with excellent stability in moisture are promising in all-solid-state batteries and redox flow batteries. However, NASIOCN LiZr2(PO4)3(LZP), which is more stable with lithium metal than the commercial Li1.3Al0.3Ti1.7(PO4)3, exhibits a low Li-ion conductivity of 10−6S cm−1because the fast conducting rhombohedral phase only exists above 50 °C. In this paper, the high-ionic conductive rhombohedral phase is stabilized by Y3+doping at room temperature, and the hot-pressing technique is employed to further improve the density of the pellet. The dense Li1.1Y0.1Zr1.9(PO4)3pellet prepared by hot-pressing shows a high Li-ion conductivity of 9 × 10−5S cm−1, which is two orders of magnitude higher than that of LiZr2(PO4)3. The in-situ formed Li3P layer on the surface of Li1.1Y0.1Zr1.9(PO4)3after contact with the lithium metal increases the wettability of the pellet by the metallic lithium anode. Moreover, the Li1.1Y0.1Zr1.9(PO4)3pellet shows a relatively small interfacial resistance in symmetric Li/Li and all-solid-state Li-metal cells, providing these cells a small overpotential and a long cycling life.Keywords:NASICON;hot pressing;interfacial resistance;Li-ion conductivity;all-solid-state batteries
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Kangning Gao,Minghui He,Yiqiu Li,Yipeng Zhang,Jun Gao,Xixiang Li,Zhonghui Cui,Zhongliang Zhan,Tao Zhang
Garnet electrolyte is a promising candidate for the development of all-solid-state Li-metal batteries, because of its safety and stability against Li metal. However, its practical application is limited by the difficulty in production of its high-density thin sheet. In this work, we have fabricated garnet thin sheet electrolytes (Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 , LLZTO) by tape-casting technique. By using Li 2 O as a liquid-phase sintering additive, a high relative density up to 99% was achieved. Electrochemical results show the LLZTO sheets have an ionic conductivity of 5.2 × 10 −4 S cm −1 at 30 °C and good cycling stability against Li metal. Based on the sheets, all-solid-state Li/LLZTO/LiFePO 4 batteries exhibit excellent reversible cycles at 60 °C and 0.1C with an initial discharge specific capacity of 125.8 mA h g −1 and a retention of 92.3% after 50 cycles. These results indicate that the tape-casting process demonstrated here provides an effective method of producing high-density garnet thin sheet electrolytes for high-performance all-solid-state Li-metal batteries.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Na Cao,Huiling Du,Jie Lu,Zhuo Li,Qian Qiang,Hai Lu
Lithium metal batteries (LMBs) demonstrate significant potential as high-energy-density storage devices. However, their practical application is hindered by challenges such as lithium dendrite formation, flammability , and the limited operating temperature range of commercial carbonate electrolytes. To address the issue, we developed a localized highly concentrated electrolyte (LHCE) using an ionic liquid as the solvent. The LHCE exhibits non-flammability, a wide operating temperature range (−30 to 70 °C), and forms a rigid, highly ion-conductive solid electrolyte interphase (SEI), which significantly enhances the cycling stability of LMBs.
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高影响因子
危险品化学品经营许可证（带存储）