SmartMat
·
2022
·
IF 0
Yajun Ding,Yuanchao Huang,Yuejiao Li,Tao Zhang,Zhong-Shuai Wu
The realization of high-efficiency, reversible, stable, and safe Li-O 2 batteries is severely hindered by the large overpotential and side reactions, especially at high rate conditions. Therefore, rational design of cathode catalysts with high activity and stability is crucial to overcome the terrible issues at high current density. Herein, we report a surface engineering strategy to adjust the surface electron structure of boron (B)-doped PtNi nanoalloy on carbon nanotubes (PtNiB@CNTs) as an efficient bifunctional cathodic catalyst for high-rate and long-life Li-O 2 batteries. Notably, the Li-O 2 batteries assembled with as-prepared PtNiB@CNT catalyst exhibit ultrahigh discharge capacity of 20510 mAh/g and extremely low overpotential of 0.48 V at a high current density of 1000 mA/g, both of which outperform the most reported Pt-based catalysts recently. Meanwhile, our Li-O 2 batteries offer excellent rate capability and ultra-long cycling life of up to 210 cycles at 1000 mA/g under a fixed capacity of 1000 mAh/g, which is two times longer than those of Pt@CNTs and PtNi@CNTs. Furthermore, it is revealed that surface engineering of PtNi nanoalloy via B doping can efficiently tailor the electron structure of nanoalloy and optimize the adsorption of oxygen species, consequently delivering excellent Li-O 2 battery performance. Therefore, this strategy of regulating the nanoalloy by doping nonmetallic elements will pave an avenue for the design of high-performance catalysts for metal-oxygen batteries.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 44
·16386-16394
·
IF 4.39
Fozia Sultana,Khaled Althubeiti,Khamael M. Abualnaja,Jiahui Wang,Abid Zaman,Asad Ali,Safeer Ahmad Arbab,Sarir Uddin,Qing Yang
For safety concerns, polymer-based Li–O2 batteries have received more attention than traditional non-aqueous Li–O2 batteries. However, poor cycling stability, low round trip efficiency, and over charge potential during cycling are the major shortcomings for their future applications. In this work, a soluble redox mediator integrated into a polymer electrolyte provides immediate access to the solid discharged product, lowering the energy barrier for reversible Li2O2 generation and disintegration. Moreover, introducing a redox mediator to the polymer electrolyte boosts the ORR during discharge and the OER during the recharge process. The synergistic redox mediator pBQ (1,4 benzoquinone) dramatically reduces the over-potential. A small proportion of pBQ in the polymer electrolyte allows Li2O2 to develop in a thin film-like morphology on the cathode surface, resulting in a high reversible capacity of ∼12 000 mA h g−1 and an extended cycling stability of 100 cycles at 200 mA g−1 with a cut-off capacity of 1000 mA h g−1. The remarkable cell performance is attributed to the fast kinetics of para benzoquinone for the ORR and OER in Li–O2 batteries. The use of a redox mediator in a polymer electrolyte opens a new avenue for practical Li–O2 battery applications in achieving low charge potential and excellent energy efficiency.
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Jiuzhou Zhang,Pu Hou,Boxuan Xi,Wanru Lin,Yang Liu,Guibin Wang,Pengfei Huo
To satisfy the market demand for excellent electrochemical performance , a flexible gel polymer electrolyte (GPE-EO) based on poly(arylene ether sulfone) copolymers containing polyether side chains (PAES-EO) was prepared via an ion-exchange reaction with ammonium poly(aryl ether sulfone) (PAES-N) and PEG–SO 3 –K + containing EO segments. Li 2 SO 4 was used as the electrolyte salt for the supercapacitor to obtain a wider potential window (1.5 V) and the electrochemical performance of the supercapacitors based on polymer electrolytes with or without EO segments was evaluated and analysed. With the introduction of EO segments, the electrolyte uptake ratio of the electrolyte membrane increased to 53.29% and delivered a higher ionic conductivity of 8.26 × 10 −4 S cm −1 . The supercapacitor based on GPE-EO exhibits a high capacitance of 153.8 F g −1 and an energy density of 11.67 W h kg −1 at a current density of 0.1 A g −1 . Simultaneously, this supercapacitor based on GPE-EO possessed excellent flexibility even at a bending angle of 180° and outstanding cycle stability with negligible specific capacitance loss after 5000 cycles. This improvement of performance of gel polymer electrolytes and supercapacitors demonstrates that introducing EO segments can increase the electrochemical performance of PEAS based energy storage devices.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenjuan Wang,Yan Zhao,Yongguang Zhang,Jiayi Wang,Guoliang Cui,Mingjun Li,Zhumabay Bakenov,Xin Wang
Over the past decade, lithium–sulfur (Li–S) batteries have been thought of as promising alternatives for the new generation of battery systems. Although the Li–S batteries possess high-theoretical energy density (2600 Wh kg–1) and capacity (1675 mAh g–1), the problems of poor electron and ion conduction, volumetric expansion, and sulfur immobilization greatly impede the wide applicability of Li–S batteries. Herein, a defect-rich multishelled Co3O4 microsphere structure doped with Fe was synthesized via a one-step hydrothermal method and subsequent thermal treatment. The unique multishelled structure provides multiple spatial confinements for lithium polysulfides trapping and buffering the volume variation during cycling. Moreover, the rich oxygen defect designed by controlled Fe doping can provide numerous catalytic sites for polysulfide redox reactions. Attributed to the synergistic effect of structural design and oxygen-defect fabrication, the sulfur composite electrode delivers a notable cycle performance, presenting a much lower capacity fading of 0.017% per cycle over 1000 cycles at 1 C and an excellent rate capability of 571.3 mAh g–1 at 5 C. This work proposes a potential approach for designing a transition metal oxide-based multishelled hollow structure combined with oxygen defect, which also offers a new perspective on high-performance Li–S batteries.
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高影响因子
CURRENT APPLIED PHYSICS
·
2020
·
IF 2.281
Yu Hai Wang,Zhe Dai,Chao Yue Zhang,Guo Wen Sun,Zhong Wei Lu,Xiu Ping Gao,Geng Zhi Sun,Wei Lan,Zhen Xing Zhang,Xiao Jun Pan,Jin Yuan Zhou
It was demonstrated that the electrochemical performance enhancements in KOH-activated carbon materials should be mainly due to the created polar oxygen-containing functional groups (OFGs, such as such as C–O, C O, –OH, and O–C O), while the role of each OFGs on the electrochemical enhancements is still unclear. In this work, KOH activation treatments were systematically conducted on carbon nanotubes (CNTs) to explore the role of each OFG on the performance enhancements of Li–S batteries (LSBs). Results showed that the capacity of activated-CNT-sulfur (a-CNT-S) cathodes is 33% higher than that of the pristine CNT-S cathodes, and their rate capability and cycling stability are also enhanced. And the electrochemical analysis combining with Fourier transform infrared spectroscopy indicated that the formed C–O bonds are the real factor for the enhanced electrochemical performances of a-CNT-S cathodes. Furthermore, the optimal activation conditions on CNT-based cathodes for LSBs were optimized to be 10 min at 700 °C.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 20
·15385
·
IF 5.6
Min Kou,Luyang Jiao,Shiyin Xu,Mengying Du,Yameng Hou,Xianglei Kong
Nucleoside radicals are key intermediates in the process of DNA damage, and alkali metal ions are a common group of ions in living organisms. However, so far, there has been a significant lack of research on the structural effects of alkali metal ions on nucleoside free radicals. In this study, we report a new method for generating metalized nucleoside radical cations in the gas phase. The radical cations [Ade+M-H]•+(M = Li, Na) are generated by the 280 nm ultraviolet photodissociation (UVPD) of the precursor ions of lithiated and sodiated ions of 2-iodoadenine in a Fourier transform ion cyclotron resonance (FT ICR) cell. Further infrared multiphoton dissociation (IRMPD) spectra of both radical cations were recorded in the region of 2750–3750 cm−1. By combining these results with theoretical calculations, the most stable isomers of both radicals can be identified, which share the common characteristics of triple coordination patterns of the metal ions. For both radical species, the lowest-energy isomers undergo hydrogen transfer. Although the sugar ring in the most stable isomer of [Ade+Li-H]•+is in a (South, syn) conformation similar to that of [Ado+Na]+, [Ade+Na-H]•+is distinguished by the unexpected opening of the sugar ring. Their theoretical spectra are in good agreement with experimental spectra. However, due to the flexibility of the structures and the complexity of their potential energy surfaces, the hydrogen transfer pathways still need to be further studied. Considering that the free radicals formed directly after C-I cleavage have some similar spectral characteristics, the existence of these corresponding isomers cannot be ruled out. The findings imply that the structures of nucleoside radicals may be significantly influenced by the attached alkali metal ions. More detailed experiments and theoretical calculations are still crucial.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Shujie Tang,Ziyue Yang,Mei Zhang,Min Guo
Efficient and clean extraction lithium (Li) from spent LiFePO 4 batteries (LIBs) still remains a challenge. In this paper, a green deep eutectic solvent (DES) based on ethylene glycol (EG) and choline chloride (CC), combined with ozone (O 3 ) from air source, realized highly selective leaching Li from LiFePO 4 in situ for the first time. The influence of experimental parameters on Li and Fe leaching efficiencies ( η Li , η Fe ) were studied by orthogonal and single-factor tests, and η Li ≥ 92.2% while η Fe ≤ 1.6% were obtained under the optimal conditions (6 h, 20 g/L, 8EG:1CC, 40 °C). The impurity Fe in the filtrate was completely precipitated as amorphous FePO 4 ·3H 2 O after heating (150 °C, 0.5 h), achieving a pure Li-solution. The leaching mechanism elucidated that the synergistic effect (acidification, replacement and oxidation reaction) between the DES and O 3 determined the phase transition of Li and Fe, promoting the efficient selective extraction of Li and in-situ separation of Fe (FePO 4 ). The average η Li and η Fe were separately 85.4% and 2.0% after ten cycles of the 8EG:1CC, indicative of its’ excellent reusability. Meanwhile, LiCl was recovered from the filtrate. This process avoided the use of strong acid/alkali and discharge of waste water, providing fresh perspectives on the green recovery of spent LiFePO 4 batteries.
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Shenghan Li,Jiatang Wang,Feng Ji,Mingyin Wang,Zhenyuan Hu,Shikang Huo,Shuai Zhang,Hansong Cheng,Yunfeng Zhang
The interfacial compatibility between inorganic powder and polymeric matrix is one of the most important key factors for the applications of polymer ceramic composite electrolytes (PCCEs). In the present study, a surface modification strategy has been proposed by using three different terminating groups of silane coupling agents in the modification of the interfacial compatibility between LLZO and PEO in PEO/LLZO composite electrolyte. Experiments and density functional theory (DFT) calculations have been performed in studying the effect of different silane coupling agents on interfacial properties . Especially, the interface compatibility is found to be improved when using amino-terminated silane coupling agent KH550, which is due to hydrogen bond interactions between amino groups and PEO. In addition, the mechanical strength and conductivity are significantly increased by increasing the interaction energy and by decreasing the crystallinity , and the values of 1.39 MPa and 0.22 mS cm −1 at 30 °C are then successfully achieved. As a result, the solid-state LiFePO 4 |PCCE|Li battery demonstrates a high discharge specific capacity of 157 mAh g −1 at 60 °C and 1C. And it has a cycle capacity decay rate of only 0.034 % for 380 cycles. These results pave the way for future developments of high-performance PCCEs.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
ZhiZhong Xie,Guanghui Chen,Zhien Liu,Xinxin Zhu,Dan Liu,Rong Li,Deyu Qu,Junsheng Li
Serious shuttle effect and sluggish reaction kinetics are the two major barriers that limit the cathode cycling stability in lithium-sulfur batteries. In this study, we deviate from the prevalent approach compositing sulfur with various carbonaceous materials by introducing electrocatalysis concept in lithium-sulfur chemistries. Two-dimensional graphene has been used as model system to support electrocatalyst Pt. Uniform dispersion of Pt nanoparticles on graphene layers not only demonstrate to preferential adsorption of soluble polysulfide species, but also catalyze efficiently transformation to long-chain polysulfides in the subsequent redox process. The result rGO-Pt/S composite shows a 29.5% enhancement in capacity over pristine rGO/S electrode. More impressively, rGO-Pt/S electrode exhibits good cycling stability at a high rate of 2 C corresponding to a tiny capacity fading rate of 0.01% per cycle over 300 discharge/charge cycles. Thus, this work provides a facile strategy for improving the performance of Li-S batteries toward practical application.
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高影响因子
DESALINATION
·
2023
·
IF 9.9
Qingyi Wang,Yongping Dong,Junmei Ma,Huimin Wang,Xuping Xue,Chaojie Bai,Mingjie Lin,Lingping Luo,Congjie Gao,Lixin Xue
Polyamide/polyethylene thin film composite (PA/PE-TFC) NF membranes were prepared from reverse-phase interface polymerization (RIP) for improved Mg(II)/Li(I) separation. RIP processes between 1,3,5-benzenetricarbonyl chloride (TMC) in bottom organic phase and piperazine (PIP) in upper aqueous phase were developed to form continuous and intact surface PA separation layers on PE porous substrates thinner than traditional polysulfone (PSF) based substrates. After activation with isopropyl alcohol (IPA), PA/PE-TFC-IPA NF membranes were formed, whose NF performance could be tuned by adjusting the preparation conditions. When TMC concentration was kept at 0.15 % w/v, RIP with low PIP concentration (0.025 wt%) yield PA/PE-TFC-IPA NF membranes with negatively charged surfaces , high Na 2 SO 4 rejection rate (95 % ± 3 %) and water permeance (13–19 L·m −2 ·h −1 ·bar −1 ). RIP with high PIP concentration (0.3 wt%) formed PA/PE-TFC-IPA NF membranes with less negative surfaces, high MgCl 2 rejection rate (94.3 ± 0.7 %), low water permeance (4.8 ± 0.3 L·m −2 ·h −1 ·bar −1 ), and high Mg(II)/Li(I) separation coefficient S Li/Mg (18 ± 1) for 1000 ppm LiCl and MgCl 2 mixed solution. PA/PE-TFC-IPA NF membranes also showed good long-term stability and improved anti-fouling performance for positively charged pollutants, bearing high potential for applications in the lithium extraction processes.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Dandan Ju,Feng Song,Jun Zhang,Chengguo Ming,Feifei Song,Adnan Khan,Aihua Zhou,Xueqin Wang,Lisa Liu
Dynamic tuning upconversion color is the most convenient approach through modulation of pump power density and NIR wavelength for anti-counterfeiting. However, most of bulk upconversion systems suffer from the insensitive response to excitation power and NIR wavelength (980 nm and 1550 nm). Herein, we demonstrate that the excitation power density sensitivity and NIR wavelength sensitivity of bulk microcrystals could be improved via co-doping Li + /Lu 3+ ions. More interestingly, co-doping ions with different valences affect the emission color tendency at 1550 nm excitation, which is contrary to previous reports. The emission color of bulk NaYF 4 :Er/Yb/Li/Lu microcrystals transform from yellow to bright green color through adjusting pump power density and pump wavelength (980 nm and 1550 nm). Moreover, the mechanism of the results has been systematically discussed. The tunable emission colors of bulk NaYF 4 :Er/Yb/Li/Lu microcrystals can be easily distinguished with naked eyes and difficultly counterfeited. Therefore, the upconversion materials have a promising application in transparent anti-fake printing.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 71
·44874-44883
·
IF 3.108
Jianxin Cai,Pengfei Zhao,Zhipeng Li,Wei Li,Jing Zhong,Ji Yu,Zhenyu Yang
In this paper, we successfully synthesized iron oxide (Fe2O3) fiber/reduced graphene oxide (rGO) composites with a “corn” structure by an electrospinning technique assisted by annealing treatment and a far infrared reduction process. The special structure consists of Fe2O3 fibers as the “corncob” completely protected by multilayer rGO as the “sepal”. Natural void space between the Fe2O3 fibers and rGO allows for the expansion of Fe2O3 upon lithiation; the good surface area and unblocked channels in the Fe2O3 fiber facilitates fast diffusion of Li+. An electrode with such structure shows excellent capacity (1085.2 mA h g−1 at 0.1 A g−1), and cycle life (407.8 mA h g−1 at 5 A g−1 for 1500 cycles with good coulombic efficiency). This is the longest cycle life for Fe2O3-based anode materials with excellent rate capability (e.g., >400 mA h g−1 at 5 A h g−1). In addition to Fe2O3, this “corn” structure can also be applied to other high capacity anode materials for next generation Li-ion batteries to improve cycle life and coulombic efficiency.
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高影响因子
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