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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DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 47
·27095-27101
·
IF 12.732
Zilong Zhuang,Chang Liu,Yiyang Yan,Pengcheng Ma,Daniel Q. Tan
Lithium metal anode (LMA) possesses the largest energy density among all anode candidates, while dendrite growth is a huge barrier in the direct application of LMA in batteries. Herein, metal–organic framework (MOF) derived Zn–CxNy nanoparticle arrays are newly grown onto carbon cloth as an effective host toward lithium metal anode. The N and Zn species are lithiophilic to Li-ions, resulting in a stable Li plating/stripping process of up to 2300 h without running into a dendrite issue when operating at a current density of 10 mA cm−2. The newly developed ZNCC-Li anode also exhibits an ultralow voltage hysteresis of only 6.4 mV at the end of the operating process. This work creates an effective design of MOF-derived lithium metal anode suitable for high-energy batteries.
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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
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Kang-Ning Gao,Hao-Ran Wang,Ming-Hui He,Yi-Qiu Li,Zhong-Hui Cui,Ya Mao,Tao Zhang
The development of solid-state lithium-oxygen batteries is currently limited primarily by the high solid-solid interfacial resistance and the lack of efficient assembly of electrolyte and electrode. In this work, noncovalent interactions between the cations of an ammonium ionic liquid and both solid electrolytes and carbon air cathodes are introduced. The ionic liquid-based electrolytes (ILE) are solidified on Li 6·40 La 3 Zr 1·40 Ta 0·60 O 12 (LLZTO) nanoparticles and gelated by multi-wall carbon nanotubes (MWCNTs), respectively, to construct LLZTO@ILE quasi-solid-state electrolyte (QSSE) and MWCNTs-LLZTO/ILE gel cathode (GC). The QSSE exhibits a high ionic conductivity of 1.71 × 10 −3 S cm −1 at 60 °C, high Li-ion transference number of 0.56, broad electrochemical window of ~4.8 V and good thermal stability . The GC shows outstanding compatibility with QSSE. Quasi-solid-state Li–O 2 batteries are assembled by integrating QSSE and GC films with a facile roll forming method, showing a low total interfacial resistance (~87 Ω cm 2 ), and excellent reversible cycles (70 cycles) with low charge overpotential (<0.44 V) and quite high electrical energy efficiency (>70%) at 60 °C and 200 mA g −1 . A 0.12 Ah pouch-type Li–O 2 battery was achieved by this method. These results suggest that the noncovalent interactions initiated by IL cations could be an effective approach to solve the solid-solid interface issue and achieve high discharge capacity in solid-state energy storage devices.
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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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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Pengfei Wan,Siyang Dong,Jing Xiong,Xuanyang Jin,Shengjun Lu,Yufei Zhang,Haosen Fan
Lithium sulfur batteries (LSBs) have been considered as one of the most promising options for next generation high-performance batteries. However, the heavy shuttle effect and inferior redox conversion during the charge/discharge processes of the batteries have greatly hindered their further applications. In this study, to address these disadvantages of LSBs, Fe/Fe 3 C/FeN 0.0324 heterostructured nanocubes were designed and prepared through high temperature carbonization process using Prussian blue precursor. Then the Fe/Fe 3 C/FeN 0.0324 nanocubes were used to modify the commercial polypropylene (PP) separator, which can greatly catalyze the redox transformation of polysulfides and provide sufficient active sites for chemisorption . As result, the modified separator endowed LSBs with excellent rate capacity and cycle stability, delivering a high-capacity of 1025 mAh/g at 0.5 C with nearly 100% coulombic efficiency. It also displayed a superb cycling performance with a per-cycle capacity attenuation rate of 0.09% after 300 cycles. When the current density increased to 1 C with the S loading of 1.73 mg cm −2 , Fe/Fe 3 C/FeN 0.0324 -PP separator presented a satisfactory capacity decay rate of 0.05% per cycle after 1000 cycles. Besides, it also presented outstanding electrochemical performance even at high sulfur loading of 4.5 mg cm −2 . This work has provided a new avenue for the design of nanomaterials with synergistic effect of catalytic conversion and chemisorption of polysulfides for the promotion of high-performance Li-S batteries.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Peng Zeng,Hao Yu,Hong Liu,Yongfang Li,Ziyi Zhou,Xi Zhou,Changmeng Guo,Bin Li,Manfang Chen,Zhigao Luo,Ying Wang,Baobao Chang,Xianyou Wang
The application of Li-S batteries is hampered by some unresolved issues, including the severe polysulfides shuttle effects and sluggish reaction kinetics. Hence, we designed and prepared tin oxide hydroxide quantum dots (TOH) anchored on a honeycomb porous carbon (HPC) matrix as multifunctional sulfur hosts, and deeply studied the enhancement of TOH on the reaction kinetics of Li-S battery referred to as the apparent activation energy, Li+ ion diffusion coefficient, and reaction barrier. It is proved by density functional theory that the HPC@TOH hosts have a higher binding energy to polysulfides than the simplex carbon matrix. Meanwhile, the catalytic TOH can decrease the surface active energy of the redox reaction and accelerate the conversion of sulfur-containing species. Consequently, by means of the synergistic effects of physical capture and chemical adsorption together with catalytic conversion, the comprehensive performances of Li-S batteries are distinctly promoted. In particular, a Li-S battery using HPC@TOH as a host delivers a good reversible specific capacity of 1342.95 mAh g–1 at 0.1 C. Moreover, with the current increased to 1 C, it shows a relatively satisfactory specific capacity of 918.05 mAh g–1. After 400 cycles, a competitive specific capacity of 688.54 mAh g–1 can still be maintained with a very low fading rate of 0.06% per cycle. Most importantly, when the sulfur areal loading reaches as high as 4.25 mg cm–2 and electrolyte/sulfur ratio is controlled to be as low as 7 μL mg–1, and the Li-S battery using HPC @TOH as a host can still cycle steadily more than 50 cycles at 0.2 C. Therefore, this work provides an effective manner to boost the comprehensive performance of Li-S batteries by virtue of optimizing and designing the host material with synergistic effects of physical capture, chemical adsorption, and catalytic conversion.
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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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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
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Wugang Fan,Xiangxin Guo,Dongdong Xiao,Lin Gu
Gold nanoparticles (AuNPs) anchored to vertically aligned carbon nanotubes (VACNTs) act as additional nucleation sites for the Li2O2 growth, leading to the decreased size while increased density of Li2O2 particles in process of discharge. Correspondingly, at the deep discharge to 2.0 V the batteries show increased specific capacity. Upon charge, the AuNPs exhibit promotion effect on the Li2O2 decomposition by improving the conduction property of the discharge-formed particles, rather than by imposing the conventional electrocatalytic effect on the oxygen evolution reaction. Moreover, the AuNPs show promotion effect on decomposition of carbonate species arising from the side reactions. These effects consequently lead to the reduced charge overpotentials and extended cycle operation of the batteries. The results here provide a new as well as clear picture on the role of incorporated AuNPs in the Li2O2 formation and decomposition, which would be helpful for better understanding and constructing of high-performance air cathodes.
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高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 36
·364003
·
IF 3.399
Chao Li,Yijie Liu,Bojie Li,Fan Zhang,Zhu Cheng,Ping He,Haoshen Zhou
All-solid-state Li–O2 batteries are receiving intense interest because of the substitution of solid electrolytes for toxic and flammable liquid electrolytes. However, new issues are arising in the aspect of the electrolyte cathode interface. On the one hand, in a traditional sandwiched battery structure, the reaction sites of the cathode are restricted to the finite planar electrode–electrolyte interface, resulting in limited performance of all-solid-state Li–O2 batteries. On the other hand, integrating the electrolyte with the cathode to achieve good interfacial contact often requires complex sintering processes. Herein, this work reports a solid electrolyte cathode assembly (SECA) which consists of a dense Li1.5Al0.5Ge1.5P3O12 (LAGP) layer and a carbon coated porous LAGP layer fabricated by facilely one-step sintering. As a result, Li–O2 batteries adopting the SECA showed a relatively high discharge capacity of 0.48 mAh cm−2 at 5 μA cm−2. Besides, the batteries could sustain six full cycles with a restricted capacity of 0.08 mAh cm−2 at 10 μA cm−2. It was found that the high capacity can be attributed to the high surface area of porous cathode structure.
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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
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