JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Chunhui Wang,Bao Zhang,Xing Ou,Haifeng Xia,Liang Cao,Lei Ming,Jiafeng Zhang
Structure control is widely admitted as a feasible strategy to restrain volume change and enhance electrical conductivity for chalcogenide anode materials . Herein, three-dimensionally hierarchical structure Co 0.85 Se@N-doped graphene hybrid is well-designed and synthesized by a facile hydrothermal strategy and post-calcination. It is noted that, owing to the nanoscale Kirkendall effect, the Co 0.85 Se nanograins derived from uniform zeolitic imidazolate framework (ZIF-67) precursor are incorporated into a polyhedron-in-polyhedron structure, which is consisted of in-situ formed amorphous carbon and interconnected pliable graphene nanosheets with enormous N-doping atoms. This unique dual-carbon protecting layers are beneficial to mitigate the volume expansion with high integrity, and facilitate the fast Li/electron transport with improved conductivity simultaneously, thus resulting in the superior Li-storage performance. As expected, the framework-controlled Co 0.85 Se@N-doped rGO composite demonstrates an outstanding cycling stability (787.7 mA h g −1 after 1000 cycles at 2 A g −1 ) and remarkable rate capability (400.8 mA h g −1 at ultrahigh rate of 10 A g −1 ). This work presents an enlightened strategy to design chalcogenide anode with desired nano-/microstructure by structure control and kinetic increase.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 4
·2529-2538
·
IF 1.774
Zhang Pengfei,Liu Yanxia,Chai Fengtao,Fan Yameng,Hou Aolin
Li 4 Ti 5 O 12 (LTO) composites modified with carbon nanotubes (CNTs) and carbon coating (LTO@C/CNTs) were synthesized by a simple solid-state reaction. The carbon-coated layers reduce the growth of the primary particles, inhibit interface side reactions and increase electron conductivity, so CNTs-modified LTO can form a conductive network and improve the diffusion path of lithium ions. The LTO@C/CNTs composites show a high-rate capability (150 mAh g −1 at 10 C, 145 mAh g −1 at 20 C) with good cycling performance (90.1% and 82.8% capacity retentions after 1000 cycles at 10 C and 20 C, respectively). In addition, superior electrochemical performance is also demonstrated in a full cell with a LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode and LTO@C/CNTs anode (97.1% capacity retentions after 200 cycles at 1 C). The carbon coating and CNTs-modified in LTO can reduce the polarization of potential difference and charge-transfer resistance, improve the diffusion coefficient of lithium ions, and lead to high rate performance and cycle stability.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hong Xiao,Tengfei Zhang,Xiao Liang,Qiuming Gao
HSN-rGO with high specific surface area and high content of N is prepared via GO reduction and N -doping of DMF, corrosion oxidation pore-forming of H 2 O 2 as well as further reduction and N -doping of N 2 H 4 •H 2 O under the solvothermal condition. The porous HSN-rGO has a high BET specific surface area of 464.3 m 2 g −1 . The N content in HSN-rGO is 5.27 at.%. The HSN-rGO shows a strong adsorption capability for the soluble lithium polysulfides (LiPSs) and more importantly it presents an excellent catalytic capability for the redox conversion of LiPSs. The HSN-rGO modified separator can inhibit the shuttle effect of LiPSs in Li-S battery. Besides, the HSN-rGO based separator has a good electrolyte wettability. The catalytic activity of HSN-rGO and Li + diffusion property in Li-S battery are well studied quantitatively. The Li-S battery with HSN-rGO-PP separator exhibits a high initial discharge capacity of 1372.8 mAh g −1 at 0.1 C and 681.5 mAh g −1 at 2 C, and a low-capacity decay rate of 0.055% per cycle for 1000 cycles at 1 C. This study proves the strategy that the HSN-rGO modified separator can effectively inhibit the shuttle effect of LiPSs and accelerate the redox reaction kinetics for high-performance Li-S battery.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Dan Li,Ziye Kang,Hao Sun,Ying Wang,Haiming Xie,Jia Liu,Jiefang Zhu
Although redox mediator (RM) strategy can decrease the overpotential in Li-O 2 batteries by tuning the electrochemical formation/degradation of Li 2 O 2 from the circumscribed surface pathway to the solution one, the redox shuttling causes an unexpected RM degradation and a continuous deterioration of Li anode, finally leading to a poor cyclability. This work presents the first report detailing the development of a novel Mn x Co 3-x O 4 -decorated separator for Li-LiI-O 2 batteries. Benefiting from the promotion effect of Mn x Co 3-x O 4 nanocages on I − /I 3 − and I 3 − /I 2 redox coupling, the cell with as-prepared separator maintains a low charge potential of ~3.3 V till the death of cell cycling. In addition, as-prepared separator can efficiently restrain the redox shuttling, leading to an obvious improvement on cycling stability for the cell. Moreover, the contributions of LiI to the battery performance and the operation mechanism are systematically investigated. These results present a promising progress in the development of multi-functional separator materials for RM-involved Li-O 2 batteries and the new design of hybrid energy storage device.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xianhua Tan,Xingyue Liu,Zhiyong Liu,Bo Sun,Junjie Li,Shuang Xi,Tielin Shi,Zirong Tang,Guanglan Liao
CsPbIBr 2 perovskite exhibits the most balanced bandgap and durability features among all the inorganic perovskites, showing great potential in the photoelectric field. Nevertheless, the poor film quality of the traditionally spin-coated CsPbIBr 2 restricts the further improvement of the device performance. Here, we develop a novel lithium (Li) doping strategy to promote the optical, morphological and electronic properties of the solution-processed CsPbIBr 2 perovskites. Upon incorporating Li + ions into CsPbIBr 2 lattice, highly crystallized and well-oriented CsPbIBr 2 crystals are obtained. The as-prepared Li-doped CsPbIBr 2 exhibits a higher film coverage over the substrate with larger grains and less grain boundaries compared to the none-doped counterparts. The trap-state densities in the CsPbIBr 2 film are also effectively alleviated while the carrier lifetimes are elongated by Li doping, contributing to a lower energy loss and a higher charge collection efficiency. The optimized Li-doped perovskite solar cells (PSCs) demonstrate an excellent champion power conversion efficiency (PCE) of 9.25%, much higher than that of the none-doped devices (7.41%). Furthermore, the unencapsulated devices present a superior air and thermal stability under the protection of the hydrophobic CuPc layer and carbon electrode. Our work provides a new opportunity to fabricate cost-effective and highly efficient CsPbIBr 2 PSCs in a facile way.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Ying Zhang,Jie Xiong,Chao Chen,Qizheng Li,Jingjing Liu,Zhicheng Zhang
The novel humidity sensor , fabricated from inorganic electrolyte doped porous metal-organic framework composite (denoted as LiCl@UiO-66-NH 2 ), is reported in the present work. The humidity sensing properties of LiCl@UiO-66-NH 2 composites have been investigated. The much higher comprehensive sensing properties of composites are obtained in LiCl@UiO-66-NH 2 with 12.5 wt% LiCl. It shows the excellent linearity (R 2 = 0.994) in a broad relative humidity (RH) range. The impedance modulus of LiCl@UiO-66-NH 2 (12.5 wt%) decreases nearly four orders of magnitude from 33% RH to 95% RH at 100 Hz. Besides, the LiCl@UiO-66-NH 2 (12.5 wt%) humidity sensor exhibits fast response (6s) and recovery (18s) speed and excellent long-term stability. The sensing mechanism was discussed through the investigation of complex impedance curves. These results suggest that LiCl@UiO-66-NH 2 have the potential application in humidity sensing. Our work offers a promising strategy for the fabrication of high performance humidity sensors.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Chunqing Cai,Fan Yang,Zhigang Zhao,Qiuxia Liao,Ruixi Bai,Wanghuan Guo,Peng Chen,Yang Zhang,Hao Zhang
This paper first reports on the high-selective separation and recovery of Li(I) from Na(I) and K(I) using the polymer inclusion membrane (PIM) system containing both thenoyltrifluoroacetone (TTA) and trioctylphosphine oxide (TOPO) as the carrier molecules, and cellulose triacetate (CTA) as the base polymer. To characterize the PIM, we used Fourier Transform infrared (FT-IR) spectroscopy, scanning election microscopy (SEM) and thermogravimetric analysis (TGA). The optimized results of this work showed that initial flux ( J 0 ) of Li(I) that was as high as 1.04 × 10 −2 mol m −2 h −1 , corresponding to permeability ( P ) of 3.62 × 10 −3 m h −1 , were recorded using the PIM composed of 50 wt% CTA and 26.74 wt% TTA + 23.26 wt% TOPO from a feed phase containing Li(I), Na(I) and K(I) in an alkaline chloride solution into an acceptor phase containing 0.1 M HCl. Li(I) was transported successfully to the acceptor phase but Na(I) and K(I) barely passed in the first 20 h. The separation factor ( S F ) of Li(I) over the Na(I) and K(I) respectively ( S F L i ( I ) / N a ( I ) ≒ 54.25, S F L i ( I ) / k ( I ) ≒ 50.60) demonstrated that Li(I) can be high-selectively separated. It is expected that this membrane can be applied for selective recovery of Li(I) from salt lakes or sea water that contains significant concentrations of Na(I) and K(I).
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shouji Huang,Liwen Yang,Ming Gao,Qi Zhang,Guobao Xu,Xiong Liu,Juexian Cao,Xiaolin Wei
MnO is one of the most attractive anode materials for Li ion batteries (LIBs) due to its high theoretical capacity and low voltage hysteresis. However, its inherent low conductivity and large volume expansion hinder real application. Herein, we construct a flexible freestanding film of MnO quantum dots , N-doped carbon layer and carbon nanotubes by an effective method and demonstrate its direct application as an anode for LIBs. The microstructure observations reveal that well-dispersed MnO quantum dots with the average of 2–5 nm attach tightly on highly conductive carbon nanotube substrates and covered by N-doped carbon layers. Such unique nanocomposite structure provides effective carbon protective layers to accommodate volume change, ensure almost the whole surface of each MnO quantum dots to attend electrochemical reaction , and increases electron conductivity and reduces Li + diffusion distance. Furthermore, kinetic analysis and characterization tests indicate that capacitive contribution for Li storage in the freestanding film is calculated to be high and further oxidation of Mn 2+ to higher valence state upon cycling generates lots of specific capacity, thus endowing it with excellent rate, ultrahigh capacity and outstanding cycling stability. The flexible freestanding anode delivers ultrahigh capacity of 1741mAh g −1 after 120 cycles at 0.1 A g −1 , a high-rate capability of 858 mAh g −1 at 3.2 A g −1 after 120 cycles at 0.1 A g −1 , and long-term cycling stability with a capacity of 136.5% at 1.0 A g −1 after 1000 cycles. The unique nanostructure design is believed to have great potential in general synthesis of the composite consisted of CNT and oxide quantum dots for energy storage.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Zhangxin Chen,Weijun Li,Yuyu Dai,Ning Xu,Chang Su,Junlei Liu,Cheng Zhang
Based on the star-shaped structure, triphenylamine derivative 1,3,5-tris(4-diphenylamino-phenyl)benzene (TTPAB) with multiple active polymerization sites of three peripheral triphenylamine units was designed and synthesized, which was further prepared into the corresponding conjugated microporous polymer PTTPAB by chemical oxidative polymerization. The polymer PTTPAB powder exhibited the blossom sphere-like morphology with high surface area (595 m 2 /g) and plentiful micropores of the average diameter of 0.68 nm as well as mesopores of the small diameter of ∼ 2–5 nm. Being explored as the organic cathode material of battery , PTTPAB exhibited more remarkable rate performance of 84, 82, 81, 80, 84 mAh g −1 than that of PTPAn (81, 73, 72, 69, 82 mAh g −1 ) in the range of 2.5–4.2 V at current rate from 50 to 500 mA g −1 . This enhanced rate performances of PTTPAB was mainly attributed to the high specific surface area caused by the plentiful micropores and mesopores from the conjugated microporous polymer structure and blossom microspheres morphology. The high surface area can benefit to the reversible redox reaction available for Li + and shorten Li + diffusion pathway, that led to the more reduced charge transfer resistance (∼160 Ω for PTTPAB and ∼920 Ω for PTPAn), thereby improving the rate performance. Meanwhile, PTTPAB showed more stable cycling life with hardly any loss and higher coulomb efficiency during the 50th charge/discharge cycle. These excellent cell performances and unique micro-mesopores structure make PTTPAB polymer a good potential candidate as the organic cathode materials for high rate performance organic reachargeable batteries.
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高影响因子
COMPOSITE STRUCTURES
·
2018
·
IF 4.101
Aboubakr Medjahed,Mehdi Derradji,Abdeldjalil Zegaoui,Ruizhi Wu,Bingcheng Li
In this study, novel fiber-metal laminates (Al-LiFMLs) were manufactured by the lay-up process using the basalt fibers/phthalonitrile (BFs/PN) composite and the Al-Li alloy. Their mechanical and gamma rays (γ-rays) shielding properties were tested and analyzed then compared to the monolithic alloy. The results indicated that the variation in the number of composite (BFs/PN) plies significantly affected the tensile and shielding properties. The mechanical properties of the Al-LiFMLs showed improvements over the properties of both the individual neat Al-Li alloys and BFs/PN composite materials. For instance, when the number of composite layers varied from 1 to 8, the ultimate tensile strength of the Al-LiFMLs increased from 216 to 483 MPa. It was found that the failure strain displayed a more ductile behavior up to about 20% for all the developed Al-LiFMLs influenced by the ductile fracture mode of the Al-Li alloy. These enhancements were due to the good combination of the composite’s high strength and the metal’s superior ductility as well as the excellent adhesion achieved between the Al-LiFMLs constituents. Moreover, the Al-LiFMLs also revealed an effective gamma rays shielding with screening ratios ranging from 25 to 43% depending on the number of composite plies .
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 25
·14407-14416
·
IF 3.049
Shixian Lv,Xugang Zhang,Pengxue Zhang,Junyu Xiang,Yawen Li,Shen Qiu,Chuanli Qin
It is reported that olivine-type lithium iron phosphate (LFP) for Li-ion batteries is one of the most widely utilized cathode materials, but its high-power applications are limited due to its intrinsically poor ion transfer rate and conductivity. Therefore, it is highly desired to fabricate LFP Li-ion capacitors (LICs) with high power performance and excellent cyclic reversibility, especially in safe, low cost and environmentally friendly aqueous electrolytes. Here, we fabricate LFP/expanded graphite (EG) nanocomposites by a one-step process, in which polyethylene glycol (PEG) is used as the particle growth inhibitor combined with vacuum infiltration of the LFP precursor into EG as a conductive sub-phase, and further investigate their high-power performance in aqueous LICs. Embedding spherical LFP nanoparticles with well-controlled size and agglomeration into the pores of EG and wrapping LFP nanoparticles by EG films contribute to the rapid electron and ion diffusion in LFP/EG composites, resulting in excellent cyclic reversibility and rate performance of LFP/EG composites. The aqueous LFP/EG//active carbon (AC) LICs were assembled in LiNO3 electrolytes with LFP/EG composites and AC as the positive and negative electrodes, respectively. The optimal LIC shows a power density of 2367.9 W kg−1 at an energy density of 6.5 W h kg−1, dramatically favorable rate characteristics and excellent cycle life with 82.1% capacitance retention of its primary capacitance at 2 A g−1 after 6000 cycles, markedly higher than those of the commercial LFP LIC. The presented aqueous LFP/EG//AC LICs with excellent electrochemical performance are expected to have broad high-power appliances that are cost-sensitive and highly secure.
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高影响因子
Inorganic Chemistry Frontiers
·
2017
·Vol. 4
·期 9
·1533-1538
·
IF 4.036
Ming Zhong,Xin Zhang,Dong-Hui Yang,Bei Zhao,Zhaojun Xie,Zhen Zhou,Xian-He Bu
In this work, a composite of 3D network nitrogen-doped porous carbon on reduced graphene oxide (denoted as NPC/rGO) was derived from pyrolysis of zeolitic imidazolate framework-8 and graphene oxide. The as-prepared NPC/rGO possesses high specific surface area, nitrogen doping and mesopores. When evaluated as the cathode catalyst for Li–O2 batteries, NPC/rGO exhibited higher specific capacity, better cyclability, and greater rate capability than either nitrogen doped porous carbon or reduced graphene oxide. The outstanding performances suggest that zeolitic imidazolate framework derived nitrogen doped porous carbon materials are promising for Li–O2 batteries.
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危险品化学品经营许可证（带存储）