DESALINATION
·
2017
·
IF 5.527
Hai-Zhen Zhang,Zhen-Liang Xu,Hao Ding,Yong-Jian Tang
High water permeability and good separation property are greatly desired in water production due to energy concerns. To explore nanofiltration (NF) membrane with high permeability for cations separation, a positively charged NF membrane was fabricated via interfacial polymerization using polyethersulfone (PES) three-channel capillary ultrafiltration (UF) membrane as substrate, polyethyleneimine (PEI) as the aqueous precursor. The NF membrane preparation conditions were optimized. To enhance the permeability of the prepared NF membrane, modified hydroxyl contained multi-walled carbon nanotubes (MWCNTs-OH), grafting with piperazine (PIP), were utilized. The resultant NF membrane showed increased water flux from 20.8 L·m − 2 ·h − 1 to 56.1 L·m − 2 ·h − 1 at 4 bar after adding 0.01 wt% modified MWCNTs-OH in aqueous solution. Interestingly, MgCl 2 rejection of the membrane also increased from 94.2% to 96.9%. The positively charged NF membrane exhibited above 97% rejection for divalent cations (Mg 2 + and Ca 2 + ) and low rejection (< 70%) for monovalent cations (Na + and Li + ), and it also showed long durability and good separation for Mg 2 + and Li + when the membrane was used to separate mixed salts solution simulated the composition of salt lake brine. The fabricated membrane would have potential for effective water softening and for reclamation of lithium from brine or seawater with high Mg 2 + /Li + ratio.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Qingyue Han,Suqing Wang,Zhouyang Jiang,Xinchao Hu,Haihui Wang
Composite polymer electrolytes using polyethylene oxide (PEO) are highly appealing by virtue of the fine electrochemical stability, inexpensiveness, and easy fabrication. However, their practical application is currently hindered by the insufficient room-temperature ionic conductivity. Herein, nickel-based ultrathin metal–organic framework nanosheets (NMS) are first introduced as a novel 2D filler into the PEO matrix. The introduction of NMS with a high aspect ratio effectively improves the amorphous region proportion of PEO and thus enhances the ionic conductivity of the electrolyte by 1 order of magnitude. In addition, the Lewis acid–base interactions between the surface-coordinated unsaturated Ni atoms in NMS and the anions of lithium salt could promote the dissociation of lithium salt. Hence, the composite electrolyte with NMS achieves a high Li+ transference value of 0.378. Along with the unique nanostructure of NMS, this NMS composite electrolyte also suppresses Li dendrite growth during cycling. As a result, the assembled all-solid-state Li/LiFePO4 battery demonstrates a high reversible capacity of 130 mA h g–1 at 0.1 C and 30 °C for 50 cycles.
✓ 已验证
DOI
高影响因子
Advanced Fiber Materials
·
2022
·Vol. 4
·期 3
·487-502
·
IF 12.958
Zhou Lei,Tufail Muhammad Khurram,Liao Yaozu,Ahmad Niaz,Yu Peiwen,Song Tinglu,Chen Renjie,Yang Wen
All-solid-state Li-SeS 2 batteries (ASSLSs) are more attractive than traditional liquid Li-ion batteries due to superior thermal stability and higher energy density. However, various factors limit the practical application of all-solid-state Li-SeS 2 batteries, such as the low ionic conductivity of the solid-state electrolyte and the poor kinetic property of the cathode composite, resulting in unsatisfactory rate capability. Here, we employed a traditional ball milling method to design a Li 7 P 2.9 W 0.05 S 10.85 glass–ceramic electrolyte with high conductivity of 2.0 mS cm − 1 at room temperature. In order to improve the kinetic property, an interpenetrating network strategy is proposed for rational cathode composite design. Significantly, the disordered cathode composite with an interpenetrating network could promote electronic and ionic conduction and intimate contacts between the electrolyte–electrode particles. Moreover, the tortuosity factor of the carrier transport channel is considerably reduced in electrode architectures, leading to superior kinetic performance. Thus, assembled ASSLS exhibited higher capacity and better rate capability than its counterpart. This work demonstrates that an interpenetrating network is essential for improving carrier transport in cathode composite for high rate all-solid-state Li-SeS 2 batteries. Graphical abstract
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高影响因子
JOURNAL OF FLUORINE CHEMISTRY
·
2022
·
IF 2.226
Xuegang Zheng,Ying Chen,Shusheng Pan,Zhiyu Liu,Dekang Xu,Yueli Zhang,Hao Lin
In this paper, a range of Yb 3+ /Tm 3+ /Ho 3+ triple-doped NaYF 4 microcrystals (MCs) were successfully prepared by hydrothermal method and characterized by X-ray diffraction, which proved to be a hexagonal phase structure with uniformity. The morphology of NaYF 4 :20% Yb 3+ , 1% Ho 3+ MCs with different doping amounts of NaOH and citric acid were studied using scanning electron microscope, and the distribution of elements of this doping system was characterized by energy dispersive spectrometer. Upconversion luminescence (UCL) spectra of the MCs using a fluorescence spectrometer with 980 nm excitation were researched, and the results demonstrated that the tunable multi-color of the MCs can be achieved by varying the doping amount of different rare-earth ions. The UC mechanism of the MCs were systematically described. Li + doped the series MCs improved their UCL efficiency. By investigating the UCL the MCs of the Li + -doped system, the emission intensities of blue (450 nm, 475 nm), green (541 nm), and red (648 nm) light of the series MCs were increased by 2.75, 2.095, 2.65, and 2.87 times, which is of great significance for its application in light-emitting diodes and solar cells.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Safdar Ali,Saddique Jaffer,Inamullah Maitlo,Farooq Khurum Shehzad,Qunying Wang,Sikandar Ali,Muhammad Yasir Akram,Yong He,Jun Nie
Silicon based anode materials has got significant attention in recent years due to its environmental affinity, lower cost and high capacity in lithium ion batteries . The Photo cured 3D porous Silica-carbon membrane (SiO 2 –C material) was synthesized via binary phase solid state photo-polymerization, freeze dried to obtain porous membrane and then used as template to get silica deposited membrane by chemical vapor deposition method (CVD) at 30 ° C, followed by calcination . The silicon deposition has been confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS). The Barret-Joyner-Halenda (BJH) pore size distribution results showed the pore size of 10.2924 nm and surface area of 21.1957 m 2 /g with cumulative pore volume of 0.040248 cm³/g. The first discharge capacity reached to 719 mAhg −1 with 79.94% columbic efficiency regarding first cycle and discharge capacity for 100 cycles reached to 693 mAhg −1 with 99% columbic efficiency, which indicated high reaction reversibility. The silicon deposition with a porous structure improved the electronic conductivity and stabilized the material. The better electrochemical performance observed could be due to porous structure and carbon matrix of SiO 2 –C material.
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DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Ju Fu,Wenbin Kang,Xiaodong Guo,Hao Wen,Tianbiao Zeng,Ruoxin Yuan,Chuhong Zhang
With the rapid emergence of wearable devices , flexible lithium-ion batteries (LIBs) are much more needed than ever. Free-standing graphene-based composite paper electrodes with various active materials have appealed wide applications in flexible LIBs. However, due to the prone-to-restacking feature of graphene layers , a long cycle life at high current densities is rather difficult to be achieved. Herein, a unique three-dimensional (3D) hierarchically porous NiO micro-flowers/graphene paper (fNiO/GP) electrode is successfully fabricated. The resulting fNiO/GP electrode shows superior long-term cycling stability at high rates (e.g., storage capacity of 359 mAh/g after 600 cycles at a high current density of 1 A/g). The facile 3D porous structure combines both the advantages of the graphene that is highly conductive and flexible to ensure rapid electrons/ions transfer and buffer the volume expansion of NiO during charge/discharge, and of the micro-sized NiO flowers that induces hierarchical between-layer pores ranging from nano-micro meters to promote the penetration of the electrolyte and prevent the re-stacking of graphene layers. Such structural design will inspire future manufacture of a wide range of active materials/graphene composite electrodes for high performance flexible LIBs.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 36
·18907-18915
·
IF 14.511
Xuefan Zheng,Yuqi Wu,Cheng Li,Jinxue Peng,Wu Yang,Zhongwei Lv,Haoyue Zhong,Zhengliang Gong,Yong Yang
All-solid-state lithium–sulfur batteries (ASSLSBs) are promising candidates for the development of next-generation batteries with high energy density and improved safety. Nevertheless, the sluggish reaction kinetics of the S and Li2S cathode and the low active material content hinder the further development of ASSLSBs. Herein, a Co3O4@nitrogen-doped carbon (Co3O4@NC) nanocomposite is used as an electronically conductive additive to promote the conversion kinetics of S and Li2S in the solid sulfur cathode. With a high sulfur content of 50 wt% and sulfur loading of 4 mg cm−2, ASSLSBs with the S–Co3O4@NC–Li7P3S11 (S–CoNC–LPS) composite cathode exhibit a high specific capacity of 1313 mA h g−1 at 0.2 mA cm−2, as well as a reversible capacity of 1167 mA h g−1 after 100 charge/discharge cycles. Furthermore, the S–CoNC–LPS cathode also demonstrates a high areal capacity of 16.12 mA h cm−2, corresponding to a reversible capacity of 1343 mA h g−1, and good cycling stability even with an ultra-high sulfur loading of 12 mg cm−2. Such a superior electrochemical performance can be attributed to the fact that Co3O4@NC lowers the reaction energy barrier and promotes the interconversion of S and Li2S.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiao Liu,Peng Zhang,Liangliang Liu,Jianwen Feng,Xiaofeng He,Xiaosheng Song,Qing Han,Hua Wang,Zhangquan Peng,Yong Zhao
Aprotic lithium–oxygen (Li–O2) batteries with an ultrahigh theoretical energy density have great potential in rechargeable power supply, while their application still faces several challenges, especially poor cycle stability. To solve the problems, one of the effective strategies is to inhibit the generation of the LiO2 intermediate produced via a surface-mediated oxygen reduction reaction (ORR) pathway, which is an important species inducing byproduct generation and low cell cyclic stability. Herein, a series of quinones and solid materials serve as the solution-mediated and surface-mediated ORR catalysts, and it was found that the generation of LiO2 and byproducts from solid catalysts was inhibited by quinones. Among the studied quinones, benzo[1,2-b:4,5-b′]dithiophene-4,8-dione, a quinone molecule with the advantage of a highly symmetrical planar and conjugated structure and without α-H, exhibits high redox potential, diffusion coefficient, and electrochemical stability, and consequently the best ORR activities and the capability to inhibit byproduct generation. It indicated that the increase of the solution-mediated ORR pathway plays an important role in restraining the discharging side reaction, substantially improving cell cycle stability and capacity. This study provides the theoretical and experimental basis for better understanding the ORR process of Li–O2 batteries.
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DOI
高影响因子
Chinese Physics B
·
2023
·Vol. 32
·期 8
·088201
·
IF 1.7
Fuliang Guo,Jiaze Lu,Meihua Su,Yue Chen,Jieyun Zheng,Liang Yin,Hong Li
The structural transformations, oxygen releasing and side reactions with electrolytes on the surface are considered as the main causes of the performance degradation of Li-rich layered oxides (LROs) cathodes in Li-ion batteries. Thus, stabilizing the surfaces of LROs is the key to realize their practical application in high energy density Li-ion batteries. Surface coating is regarded as one of the most effective strategies for high voltage cathodes. The ideal coating materials should prevent cathodes from electrolyte corrosion and possess both electronic and Li-ionic conductivities simultaneously. However, commonly reported coating materials are unable to balance these functions well. Herein, a new type of coating material, La2CuO4 was introduced to mitigate the surface issues of LROs for the first time, due to its superb electronic conductivity (26–35 mS⋅cm−1) and lithium-ionic diffusion coefficient (10−12–10−13 cm2⋅s−1). After coating with the La2CuO4, the capacity retention of Li1.2Ni0.54Co0.13Mn0.13O2 cathode was increased to 85.9% (compared to 79.3% of uncoated cathode) after 150 cycles in the voltage range of 2.0–4.8 V. In addition, only negligible degradations on the deliverable capacity and rate capability were observed.
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DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 33
·335603
·
IF 3.874
Baige Yuan,Jun Li,Manman Xia,Ying Zhang,Ruyan Lei,Peng Zhao,Xiao Li
Hollow-structured NiO + Ni nanofibers wrapped by graphene were designed and successfully fabricated via a simple method. First, solid NiO + Ni nanofibers were prepared by electrospinning followed by calcination. Here, a portion of the metallic Ni was retained to improve the electrochemical performance of NiO by adjusting the calcination temperature. Next, the nanofibers were thoroughly mixed with different amounts of graphene and calcinated once more to form hollow-structured NiO + Ni nanofibers with an extremely high specific surface via the reaction between graphene and NiO on the nanofiber surface and subsequent migration of NiO into the nanofibers. Results showed that the obtained hollow-structured NiO + Ni electrode demonstrates optimal electrochemical performance when the graphene content is controlled to 3 wt%. The first cycle discharge/charge specific capacity of the electrode peaked (1596/1181 mAh · g−1 ) at 100 mA · g−1, with a coulombic efficiency of approximately 74% (60% for 0 wt% graphene, 65% for 1 wt% graphene, and 51% for 4 wt% graphene). It also presented excellent cycling stability after 100 cycles at 100 mA · g−1 on account of its high retained discharge specific capacity (251 mAh · g−1 for 0 wt% graphene, 385 mAh · g−1 for 1 wt% graphene, 741 mAh · g−1 for 3 wt% graphene, and 367 mAh · g−1 for 4 wt% graphene). Moreover, the synthesized electrode possessed outstanding rate capability owing to its large average discharge specific capacity of approximately 546 mAh · g−1 (45 mAh · g−1 for 0 wt% graphene, 256 mAh · g−1 for 1 wt% graphene, and 174 mAh · g−1 for 4 wt% graphene) from 100 mA · g−1 to 2000 mA · g−1. The observed improvement in electrochemical performance could be attributed to the increase in active sites and decrease in charge transport distance in the hollow-structured NiO + Ni nanofibers. Excessive introduction of graphene caused a sharp loss in electrochemical performance due to the agglomeration of graphene sheets on the nanofiber surfaces.
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高影响因子
Small
·
2022
·Vol. 18
·期 16
·2105738
·
IF 15.153
Man Yuan,Chenyang Meng,Ang Li,Bin Cao,Yue Dong,Dengke Wang,Xuewei Liu,Xiaohong Chen,Huaihe Song
Fast charging rate and large energy storage are key requirements for lithium-ion batteries (LIBs) in electric vehicles. Developing electrode materials with high volumetric and gravimetric capacity that could be operated at a high rate is the most challenging problem. In this work, a general multi-interface strategy toward densified carbon materials with enhanced comprehensive electrochemical performance for Li/Na-ion batteries is proposed. The mixture of graphene oxide and sucrose solution is sprayed into a water/oil system and furtherly carbonized to get graphene/hard carbon spheres (GHSs). In this material, abundant ingenious internal interfaces between the crystalline graphene and the carbon matrix are created inside the hard carbon spheres. The constructed interfaces can not only work as a pathway for the escape of volatile gas generated during sucrose pyrolysis to prevent the formation of abundant pores, which leads high packing density of 0.910 g cm –3 and low surface area of 13.3 m 2 g –1 , but can also provide a conductive “highway” for ions and electrons. When used as the anode material for both LIBs and sodium-ion batteries (SIBs), the GHS shows the high gravimetric/volumetric reversible capacities, high-rate performance, and low temperature properties simultaneously, implying the great potential application in practical LIBs and SIBs.
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DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·
IF 0.936
Liang WANG,Zhang-Quan PENG
Development of lithium-oxygen (Li-O 2 ) batteries is hindered by large overpotentials, low energy efficiency and unsatisfactory cycling life, which are predominately caused by the oxygen evolution reaction (OER) involving sluggish oxidation of lithium peroxide (Li 2 O 2 ). Herein, a highly-efficient soluble redox mediator (RM) of N , N’ -Diphenyl- p -phenylenediamine (DPPD) is introduced to catalyze the oxygen evolution reaction for Li-O 2 batteries. During charging process, DPPD is electrochemically oxidized into DPPD + , which can chemically decompose Li 2 O 2 on the cathode with a much-reduced overpotential. The in-situ differential electrochemical mass spectrometry confirms that the charging process is dominated by Li 2 O 2 decomposition. With the assistance of DPPD, Li-O 2 cells can achieve lower charging potential, improved cycling stability, and prolonged lifespan (294 cycles) which is three times longer than that of tetrathiafulvalene counterpart. This work presents a credible and viable opportunity for long lifespan Li-O 2 batteries.
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DOI
高影响因子
危险品化学品经营许可证（带存储）