Nano Energy
·
2017
·
IF 12.343
Haoxiang Yu,Hua Lan,Lei Yan,Shangshu Qian,Xing Cheng,Haojie Zhu,Nengbing Long,Miao Shui,Jie Shu
Hollow microstructure always exhibits some special properties in the field of electrochemistry . Here, this study reports the rational design and preparation of TiNb 2 O 7 nanofibers with one dimensional hollow structure via co-electrospinning. The as-electrospun TiNb 2 O 7 hollow nanofibers show high intercalation potential, low charge-charge resistance and fast electrochemical kinetics . The electrochemical results exhibit that the TiNb 2 O 7 hollow nanofibers deliver a reversible capacity of 210.1 mAh g −1 after 150 cycles at a current rate of 0.4 C, and 158.4 mAh g −1 after 900 cycles even at a current rate of 10 C with an outstanding capacity retention of 80.6%. The excellent electrochemical performance of nanofibers can be related to the unique morphology of hollow structure. Furthermore, the lithium ions storage mechanism of TiNb 2 O 7 hollow nanofibers is also systematically analyzed, which is related to one two-phase coexistence and two solid-solution processes during the whole charge-discharge cycle. In addition, it is also demonstrated by in situ and ex situ observations that TiNb 2 O 7 hollow nanofibers have outstanding structural stability and electrochemical reversibility. Therefore, the TiNb 2 O 7 hollow nanofibers can be applied as an alternative promising electrode material for the next rechargeable lithium ions batteries .
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机功能材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 22
·44983-44992
·
IF 5.1
Shuai Zhao,Hai-lin Ren,Yang Su,Cheng-wei Li,Xiao-min Wang
High-nickel layered cathode materials for lithium-ion batteries have received widespread attention in new energy vehicles for their excellent specific energy and cost advantages, and are considered to be the most promising cathode materials for high-energy density lithium-ion batteries. Despite its many advantages, poor thermal stability and rapid capacity degradation have greatly limited its large-scale application. Ion doping is considered to be an effective way to improve its drawbacks, and in this paper, a series of W-doped LiNi 0.9 Co 0.1 O 2 cathode materials were prepared using WO 3 as a tungsten source. Among them, 1 mol% W doping was the most effective, and its reversible capacity of 204.44 mA g −1 still had 93.25 % capacity retention after 100 this cycles at 1C. Combined with DFT calculations , it is found that the introduction of W does not change the original layered structure and the material transitions from semi-metallic to metallic at lower doping concentrations, resulting in more electrons occupying the Fermi energy levels to enhance its electrical conductivity and leading to an elevated spin state and a lower oxidation state of Ni.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态化学
·
计算材料学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chenyu Lin,Tianqi Yang,Haiyuan Zhang,Donghuang Wang,Wenkui Zhang,Yao Wang,Yang Xia,Hui Huang,Xinhui Xia,Yongping Gan,Xinping He,Xinyong Tao,Jun Zhang
Solid-state lithium metal batteries with high energy density and safety have gained increasing attention due to their potential applications. However, the practical use of solid electrolytes is hindered by several challenges. These include poor compatibility at the electrode–electrolyte interface, low ionic conductivity at room temperature, and fast capacity degradation. To address these issues, here we propose ternary strategies by in-situ cross-linked plastic crystal electrolyte (in-situ PCE) based on succinonitrile (SN). Through the in-situ polymerization of SN with polyacrylonitrile/poly(vinylidene difluoride) (PAN/PVDF) nanofibers separator, excellent mechanical strength and compatibility at the electrode–electrolyte interface are achieved. The cross-linked structure of thermally polymerized ethoxylated trimethylolpropane triacrylate (ETPTA) immobilizes the SN molecule, preventing its contact with the lithium metal and inhibiting irreversible side reactions. Additionally, a LiF-rich passivation layer is employed to further protect the SN at the electrolyte-lithium metal interface. The dual protection from ETPTA and LiF offers excellent stability to lithium. Hence, the in-situ PCE exhibits high ionic conductivity (0.79 mS cm −1 at 30 °C) and wide electrochemical window (4.56 V, vs Li + /Li). The cells exhibit excellent cycling stability and high-rate performance. LiFePO 4 //Li cells retain 96.6 % capacity after 1000 cycles at 10C rate. This study provides valuable insights into the development of high-performance solid-state electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
固态离子学
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Yan Zhang,Zhenlong Zhang,Yanyan Liu,Yuefeng Liu,Huiping Gao,Yanli Mao
In this work, we synthesized CuInSe 2 quantum dots (CISe QDs) and applied them to perovskite solar cells (PSCs) as an inorganic hole-transporting material (HTM). A power conversion efficiency (PCE) of 12.8% was achieved for the PSCs using CISe QDs as the HTM, which is the highest value reported to date for devices with a Cu-based chalcopyrite semiconductor as HTM. More importantly, the stability of PSCs with CISe QDs was significantly improved compared with that of the devices using spiro-OMeTAD as the HTM. These results demonstrate that CISe QDs are a promising inorganic HTM for PSCs with long-term stability and low cost.
研究领域:
材料科学
·
光伏技术
·
纳米材料
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yihui Li,Kun Chang,Hongwei Tang,Bao Li,Yalei Qin,Yan Hou,Zhaorong Chang
To address the large structural and volume changes of commercial WO 3 during charge/discharge, which make this material unsuitable for use in Li-ion batteries (LIBs), we herein prepared oxygen deficient WO 3- x nanosheets on a large scale by thermal treatment of ammonium paratungstate in a reducing atmosphere followed by sonication and freeze-drying. The above nanosheets were employed as LIB anode materials and exhibited a specific capacity and cycling stability significantly exceeding those of oxygen-deficient WO 3- x nanoparticles and commercial WO 3 . In addition, we investigated the effect of nanosheet loading on electrode performance, demonstrating that the best results (Li storage capacity of ∼628 mAh g −1 after 100 cycles at 100 mA g −1 ) were obtained at a nanosheet content of 20 wt%. This excellent performance was ascribe to the good exposure of defects caused by the comparatively small size of WO 3- x nanosheets , which resulted in an increased number of sites and diffusion paths available for Li-ion storage and transfer. The novel electrode-optimized strategy may be extended to the fabrication of other electrodes that use nanomaterials as active substances due to its superior comprehensive performance and low cost.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Zhenhua Wang,Jing Zhang,Yuxiang Yang,Xinyang Yue,Xiaoming Hao,Wang Sun,David Rooney,Kening Sun
Traditionally polyvinylidene fluoride membranes have been used in applications such as membrane distillation , wastewater treatment , desalination and separator fabrication. Within this work we demonstrate that a novel carbon nanofiber/polyvinylidene fluoride (CNF/PVDF) composite membrane can be used as an interlayer for Lithium Sulfur (Li S) batteries yielding both high capacity and long cycling life. This PVDF membrane is shown to effectively separate dissolved lithium polysulfide with the high electronic conductivity CNF not only reducing the internal resistance in the sulfur cathode but also helping immobilize the polysulfide through its abundant nanospaces. The resulting Li S battery assembled with the CNF/PVDF composite membrane effectively solves the polysulfide permeation problem and exhibits excellent electrochemical performance. It is further shown that the CNF/PVDF electrode has an excellent cycling stability and retains a capacity of 768.6 mAh g −1 with a coulombic efficiency above 99% over 200 cycles at 0.5C, which is more than twice that of a cell without CNF/PVDF (374 mAh g −1 ). In addition, the low-cost raw materials and the simple preparation process of CNF/PVDF composite membrane is also amenable for industrial production.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 86
·45930-45938
·
IF 3.708
Mengmeng Zhang,Hongxia Yan,Xiaowei Yang,Chao Liu
In this paper, graphene oxide (GO) was functionalized with a hyperbranched cyclotriphosphazene polymer, which was synthesized by the repeated reactions of hexachlorotriphosphazene with hexamethylenediamine. Subsequently, the resultant functionalized GO was incorporated into dicyclopentadiene bisphenol dicyanate ester (DCPDCE) to prepare composites. Fourier-transform infrared spectra, X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron spectroscopy were employed to examine the surface functionalization of GO. The effects of functionalized GO on the curing reactivity, mechanical, dielectric, thermal and water resistent properties of DCPDCE resin were investigated systematically. Results show that the addition of modified GO can facilitate the curing reaction of DCPDCE. Meanwhile, the appropriate content of modified GO can enhance the mechanical properties including impact and flexural strengths of DCPDCE resin. When modified GO content is 0.6 wt%, the corresponding composite exhibits slightly higher dielectric constant but lower dielectric loss than pure DCPDCE resin over the testing frequency from 10 to 60 MHz. In addition, the thermal stability and moisture resistance of modified GO/DCPDCE nanocomposties are also superior to that of pure DCPDCE resin.
研究领域:
高分子化学
·
复合材料科学
·
材料物理与化学
·
纳米材料
·
绝缘材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Jingxiong Gao,Songyi Han,Haiming Hua,Jie Wu,Jing Zeng,Yuanyu Sun,Weiping Tang,Shuling Liu,Jinbao Zhao
To optimize the electrochemical behavior of NCM-based high-energy lithium-ion batteries (LIBs) in wide temperature ranges, Phenyl trifluoromethane sulfonate (PTM) is demonstrated as the novel electrolyte additive to enhance the electrochemical behavior of LiNi 0·6 Co 0·2 Mn 0·2 O 2 /graphite cells at 25 °C, −20 °C and 45 °C. The cells with 1.0 wt% PTM-containing electrolyte deliver 80.6% capacity retention after 350 cycles at 25 °C, 73.4% after 100 cycles at −20 °C, and 82.6% after 300 cycles at 45 °C, which are significantly higher than that in standard electrolyte (STD), corresponding to 36.4% at 25 °C, 40.3% at −20 °C, and failure at 45 °C, respectively. According to density functional theory (DFT) simulations and quantitative calculations, the PTM preferentially reduces on the anode and oxidizes on the cathode to participate in the formation of solid electrolyte interphase (SEI) films. In addition, the scanning electron microscopy (SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and other analysis suggest that the formed SEI films are thinner and more stable for the electrolyte containing PTM, and the formed SEI films effectively control the decomposition of carbonate-based electrolytes and greatly decrease the increased resistance during the cycle.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂电池技术
·
界面化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 13
·21560-21568
·
IF 3.83
Mingcai Li,Xuejie Zhang,Yinjian Zheng,Yaliang Xu,Haoran Zhang,Yingliang Liu,Bingfu Lei
The discovery of light converter excited by near-ultraviolet (UV) superior broadband blue-emitting lighting source is a main challenge in plant growth LEDs. In this study, SrLu 2 O 4 :Ce 3+ , Li + , F − blue phosphor has been synthesized via a solid-state reaction. Benefitting from doping of F − ions, SrLu 2 O 4 :Ce 3+ , Li + , F − phosphor (λ ex = 405 nm, λ em = 460 nm) shows a strong broadband (FWHM = 90 nm) blue-emitting with lower critical concentration of Ce 3+ ions and an increasing 6.9% thermal quenching performance (92.1% @ 423 K of the peak intensity at room temperature). Moreover, a blue light converter composed of SrLu 2 O 4 :Ce 3+ , Li + , F − phosphor and glass matrix is obtained based on phosphor-in-glass (PiG) technology, exhibiting excellent thermal stability and outstanding moisture resistance . A red light converter with commercial red phosphor is obtained by the same method. Furthermore, by combining of two light converters with near-UV chip, a proof-of-concept plant growth high power LED is achieved and applied in indoor Italian lettuce growing in comparison with commercial plant lamps.
研究领域:
材料科学
·
光学工程
·
农业光电子学
·
固体发光
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2023
·Vol. 9
·期 11
·2300392
·
IF 6.2
Guangliang Li,Lingxian Kong,Qi Su,Xianhua Tan,Xuning Zhang,Zhiyong Liu,Tielin Shi,Guanglan Liao,Bo Sun
Few-layer black phosphorus (FL-BP) shows great potential in infrared polarization-sensitive photodetection due to its narrow bandgap and strong in-plane anisotropy. However, FL-BP is easy to be oxidized and degraded, which severely restricts its applications. Herein, a simple and scalable in situ interfacial passivation method based on pentacene film is reported to enhance the ambient stability of FL-BP as well as achieve n-type doping for improved polarization-sensitive photoimaging. High crystal quality FL-BP flakes with intrinsic anisotropy are prepared by electrochemical exfoliation. The morphology and Raman spectra of FL-BP/pentacene exhibit excellent stability 28 days after passivation. In addition, the hole mobility is significantly enhanced and dark current is substantially suppressed due to the interfacial passivation and n-type doping effect. The FL-BP/Pentacene based photodetector shows a broadband response from visible to near-infrared with good stability. The photoresponsivity under 915 nm illumination is calculated as 2.2 mA W −1 with an anisotropy ratio of 1.29. Furthermore, the polarization imaging under the irradiation at zigzag and armchair directions directly reveals the strong infrared polarization-sensitive imaging capability of FL-BP/pentacene. This work also opens up new avenues to enhance the photoresponse and stability of various optoelectronics based on similarly unstable 2D materials.
研究领域:
纳米材料学
·
光电子学
·
二维材料
·
半导体物理
·
红外成像
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Fengchen Zhou,Xu-Sheng Yang,Jiangwen Liu,Jun Liu,Renzong Hu,Liuzhang Ouyang,Min Zhu
Owing to the high theoretic capacity (2596 mAh g −1 ) and suitable lithiation potential (～0.7 V vs. Li + /Li), Black phosphorus (BP) is considered as an ideal anode material for the fast-charging lithium-ion batteries. However, BP still faces the large volume change and low Li + transfer during the charge/discharge. In this work, a facile two-step high-energy ball milling method is developed to synthesis the black phosphorus@TiP 2 –C (CBP@TiP 2 –C) nanocomposite for the high-rate performance anode material, in which the conductive nanocrystalline TiP 2 is in-situ introduced and uniformly distributed into BP-C matrix. We reveal that the uniformly dispersed TiP 2 nanocrystals can enhance the electronic and ionic conductivities of active particles and the electrode reaction kinetics. The lithiation product cubic Li y TiP 4 phase is beneficial to release the stress, reduce the Li + diffusion energy barrier and accelerate the Li + extraction from LiP 3 upon delithiation . Moreover, the contact among different components can be improved by Ti–C and P–C bonds in the CBP@TiP 2 –C, thus ensuring excellent electric contact within the material and enhancing the structural stability of composites. As a result, the CBP@TiP 2 –C anode displays a high reversible capacity of 1007.4 mAh g −1 at 10.0 A g −1 and excellent capacity retention of 925.6 mAh g −1 after 500 cycles at 2 A g −1 .
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固态化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 22
·33455-33461
·
IF 5.532
Yuyu Liu,Wenye Deng,Xianghui Chen,Yan Xue,Xuelian Bai,Huimin Zhang,Aimin Chang,Yongxin Xie
A series of novel high temperature negative temperature coefficient (NTC) composite ceramics based on (1- x )CaMn 0.05 Zr 0.95 O 3 - x NiMn 2 O 4 ( x = 0, 0.1, 0.2, 0.3) were fabricated by using the solid-state method. The Rietveld refinement method and backscattered electron (BSE) image confirmed the absence of any other phase. The conduction mechanism of the composite ceramics was determined by analyzing the complex impedance and resistance-temperature characteristics, which could be related to the formation of a continuous Mn 3+ -O-Mn 4+ network. The effect of spinel content on the high temperature stability was analyzed using aging tests. The ρ 400°C , ρ 700°C and B 400/700 values of the NTC thermistors were determined to be 4.9 × 10 6 –1.2 × 10 4 , 1.4 × 10 5 –0.8 × 10 3 Ω cm and 12739-5712 K, respectively. This indicated that the electrical properties could be tuned by adjusting the weight ratio of CaMn 0.05 Zr 0.95 O 3 and NiMn 2 O 4 . The findings obtained in this study reveal that the composite NTC thermistor exhibits a good application potential at high temperatures and under harsh environments.
研究领域:
材料科学
·
无机非金属材料
·
电子功能材料
·
固态离子学
·
高温传感器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）