CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jianhua Zhu,Qian Xiao,Ting Zhang,Yefeng Yin,Yang Liu
The effects of acceptor dopant (typical Mn 2+ ) and donor dopant (typical V 5+ ) on the reliability of Li 2 ZnTi 3 O 8 based low temperature co-fired ceramics (LTCC, in short) have been investigated. Large difference occurs among different types of dopants. V 5+ doping decreases the breakdown voltage of the multilayer capacitors which were manufactured by low temperature sintered Li 2 ZnTi 3 O 8 ceramics, however, Mn 2+ doping increases the breakdown voltage and lowers down the leakage current significantly. This may very likely due to the fact that donor induces the generation of weak bound electrons while acceptor capture the weak bound electrons. The results suggest that Mn 2+ is a very effective additive for improving the reliability of low temperature sintered Li 2 ZnTi 3 O 8 ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 21
·期 1
·125-131
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IF 2.327
Ren Yurong,Lu Peng,Huang Xiaobing,Ding Jianning,Wang Haiyan
Li 2 ZnTi 3 O 8 /C nanocomposite has been synthesized using phenolic resin as carbon source in this work. The structure, morphology, and electrochemical properties of the as-prepared Li 2 ZnTi 3 O 8 samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Raman spectroscopy (RS), galvanostatic charge–discharge, and AC impedance spectroscopy. SEM images show that Li 2 ZnTi 3 O 8 /C was agglomerated with a primary particle size of ca. 40 nm. TEM images reveal that a homogeneous carbon layer (ca. 5 nm) formed on the surface of Li 2 ZnTi 3 O 8 particles which is favorable to improve the electronic conductivity and inhibit the growth of Li 2 ZnTi 3 O 8 during annealing process. The as-prepared Li 2 ZnTi 3 O 8 /C composite with 6.0 wt.% carbon exhibited a high initial discharge capacity of 425 and 159 mAh g −1 at 0.05 and 5 A g −1 , respectively. At a high current density of 1 A g −1 , 95.5 % of its initial value is obtained after 100 cycles.
研究领域:
材料科学
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纳米技术
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 32
·12303-12314
·
IF 4.052
Haoqing Tang,Tao Liu,Zhiyuan Tang
ZnO materials with multidimensional stereoscopic morphologies were synthesized via a one-step solvothermal process with water, ethanol and acetone as solvents. In this work, well-prepared ZnO was used as a Zn source for preparing pristine Li2ZnTi3O8 anode materials for the first time by a facile solid-state method. The resulting Li2ZnTi3O8 electrode material with rice-shaped ZnO as the zinc source (LZTO-E) possessed a smaller particle size and larger specific surface area, which were conducive to increase the electrochemical reaction area. Impressively, the LZTO-E electrode showed an excellent electrochemical performance with large discharge capacity (253.4 mA h g−1 at 100 mA g−1) and good cycling stability (175 mA h g−1, 133.4 mA h g−1, and 115.0 mA h g−1 at 1000 mA g−1, 2000 mA g−1, and 5000 mA g−1 after 500 cycles, respectively). This superior electrochemical performance of the as-synthesized Li2ZnTi3O8 was attributed to the specific microtopography of ZnO.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Chi Chen,Zhuye Li,Baoming Xu
The C&N coated Li 2 ZnTi 3 O 8 is synthesized by heat-treating pristine Li 2 ZnTi 3 O 8 and urea (CO(NH 2 ) 2 ) at 400 °C for a short time. The content of the C&N layer of the C&N coated Li 2 ZnTi 3 O 8 is ~3.5 wt% and the N content of 2.06 wt% is achieved. After coupling with a C&N layer, the C&N coated Li 2 ZnTi 3 O 8 delivers a discharge specific capacity of 230.1, 211.9, 197.4, 190.6 and 180.4 mAh g −1 after 10 cycles at the current density of 0.1, 0.5, 1.5, 2.5 and 4.0 A g −1 , respectively, and exhibits a remarkable stability over 400 cycles at 1.5 A g −1 . The effect of the formed C&N layer on the structure and electrochemical properties of the C&N coated Li 2 ZnTi 3 O 8 has been characterized by a series of means.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Pei Fu,Zhuye Li,Yong Pan,Wenbin Zeng,Chen Zhu,Baoming Xu,Chi Chen
A b s t r a c t Pristine Li 2 ZnTi 3 O 8 and Li 2 ZnTi 2.97 Sm 0.03 O 8 are prepared by a conventional solid-state reaction method and the XRD , SEM, HRTEM and EDS measurements are employed to investigate the effects of Sm 3+ modifying on the characteristics of Li 2 ZnTi 3 O 8 . The results show that the introduction of a small amount of Sm 3+ does not change the bulk structure of Li 2 ZnTi 3 O 8 but effectively improves its electrochemical performance . After undergoing 500 cycles at 1 A g −1 , a retained specific capacity of 162.7 mAh g −1 is delivered by Li 2 ZnTi 2.97 Sm 0.03 O 8 , which is much higher than 118.1 mAh g −1 of pristine Li 2 ZnTi 3 O 8 . The significantly improved electrochemical performance of Li 2 ZnTi 2.97 Sm 0.03 O 8 can be attributed to the influence of Sm 3+ on the crystal lattice and surface of Li 2 ZnTi 3 O 8 .
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Haoqing Tang,Lingxing Zan,Zhiyuan Tang
Well-prepared pristine Li 2 ZnTi 3 O 8 has a great potential to be employed as anode material, which possesses a lager lithium intercalation capacity and excellent rate performance for Li-ion batteries because of its higher electronic conductivity. To obtain an optimal preparation condition, the Li 2 ZnTi 3 O 8 anode materials were prepared and annealed in air and nitrogen atmospheres for comparison. To our surprise, Li 2 ZnTi 3 O 8 materials annealed in nitrogen atmosphere exhibits excellent stable cycling life and rate performance indicated by a higher reversible capacity of 181.9 mAh g −1 over 100 cycles at 2000 mA g −1 because it can introduce the oxygen defect and improve the intrinsic electronic conductivity. These superior electrochemical performances are primarily attributed to the ameliorated electronic conductivity, which derives from the change of Ti valence from +4 to +3. Besides, a novel LiNi 0.5 Mn 1.5 O 4 /Li 2 ZnTi 3 O 8 full cell is configured and it exhibits good rate capacity under 2.0–4.6 V at different charge rates and discharged at 2.0 A g −1 . This full cell system exhibits excellent capacity at the high charge and discharge rates and it could be suitable candidate for application in the large capacity storage devices. Moreover, it can also be widely used in the field of the fast charge and discharge electronic products.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2022
·
IF 0.836
Zhifen Fu,Chang Li,Chen Chen,Yubin She,Zhongyi Yang
low-fired Li2ZnTi3O8 ceramics were fabricated by a solid-state reaction method for developing LTCC applications. TLBBC mixed sintering aid was used to improve the sintering stability. X-ray diffraction analyses demonstrated that specimens corresponded well to the cubic crystal symmetry structure of Li2ZnTi3O8, accompanying with a little of impure phase Ca3Ti2O7 and LiBO2. The sintering temperatures of Li2ZnTi3O8 ceramics were lowered to 950 °C due to the formation of low melting point LiBO2. At x = 3, Li2ZnTi3O8 ceramics exhibited an microwave dielectric properties with εr = 21.0, tanδ = 5.76 × 10−4, Q × f = 14750 GHz, τf = −11.5 ppm/°C at 950 °C.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 8
·3001-3012
·
IF 2.8
Tang Haoqing,Zhao Siying,Weng Qiang,Liu Tao,Tang Zhiyuan,Liu Xiaotong
A novel strategy to improve the ionic conductivity of the Li 2 ZnTi 3 O 8 (LZTO) anode is proposed by embedding exfoliation and exchange of Li + montmorillonite (MMT) in LZTO particles. Li 2 ZnTi 3 O 8 and montmorillonite (LZTO-MMT) composites are shown to induce not only a high concentration of Li + in the interlamellar channel of MMT but also a reduction in the distance for Li + migration to ensure fast and stable Li + diffusion kinetics. Furthermore, the thus obtained LZTO and 6 wt% MMT (LZTO-6MMT), composed of fast Li + conductor MMT, exhibits increased Li + conductivities, excellent high-rate Li + storage capacities, and significant improvement in cycle reversibility. The LZTO-6MMT electrode delivers 219.6 mAh g −1 at a current density of 1.0 A g −1 after 500 cycles and shows an excellent high-rate performance of 127.8 and 112.0 mAh g −1 over 2000 cycles at 5.0 and 10.0 A g −1 , respectively. X-ray photoelectron spectroscopy and ex situ Raman spectrum analyses suggest that the chemical bonds and crystal structure remain stable after multiple Li + intercalation/deintercalation processes. To the best of our knowledge, this is the first report on the introduction of fast-ion conductor MMT into LZTO and its application to lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chenying An,Caihui Li,Haoqing Tang,Tao Liu,Zhiyuan Tang
High performance flexible electrodes with ultrathin and ultralight characteristics are great potential as power supply for foldable and wearable electronic devices. One major problem is how to combine active material with conductive substrate firmly in the absence of polymeric binder. Here, sandwich structure of flexible electrode is successfully prepared which Li 2 ZnTi 3 O 8 @multi-walled carbon nanotubes (MWCNTs) composite as intermediate anode active ingredient and three-dimensional network MWCNTs as top and bottom conductive layers. The MWCNTs in active material and conductive layers cross-link each other to form a firm and stable three-dimensional network, which provides stereoscopic electron and ion transmission channels without metal copper substrate. This particular structure of electrode is effectively reduce the total weight and improve flexibility. Typically, the flexible Li 2 ZnTi 3 O 8 @MWCNTs electrode shows good cycling stability and achieved a high reversible capacity of 95.2 mAh g −1 after 1000 cycles at current density of 7000 mA g −1 with 89.0% capacity retention and 99% Coulombic efficiency. This study offers a new strategy for the development of high conductivity flexible electrode for wearable devices and deformable electronic devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Haoqing Tang,Chi Chen,Tao Liu,Zhiyuan Tang
Novel N-doped carbon coated Li 2 ZnTi 3 O 8 anode active materials are synthesized via one step high temperature calcination solid state reaction method using chitosan and chitosan oligosaccharide as advanced carbon sources. Coating a nano-thickness conductive N-doped carbon layer between particles is beneficial to enhance the electronic transmission speed. Physical characterization results show that all as-prepared samples have a cubic spinel structure with a P4 3 32 space group without any impurities, and the Li 2 ZnTi 3 O 8 with chitosan additive (molecular weight: 5000) has the best dispersity and smallest particle size in all as-prepared electrode materials . The length of organic compound molecular chain has a direct impact on the agglomeration of particles and reversible lithium intercalation capacity. When tested as the anode for lithium ion batteries , the optimal electrode material shows the largest discharge capacities and remarkable long-term cycling stability at a current density of 1.0, 2.0, and 5.0 A g − 1 over 500 cycles, respectively. Combining structural characterization with electrochemical performance, N-doped carbon layer, high degree of particle dispersibility and larger interface contact area are contributed to the enhancement of both electronic and ionic conductivities and of Li 2 ZnTi 3 O 8 .
研究领域:
材料科学
·
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaotong Liu,Qiang Weng,Tao Liu,Zhiyuan Tang,Haoqing Tang
Li 2 ZnTi 3 O 8 (LZTO) has been highlighted as a promising active anode material for rechargeable lithium-ion batteries, but it suffers from a low high-rate capacity due to the sluggish Li-ion diffusion kinetics and inevitable consumption of Li + due to side reactions at the electrode/electrolyte interface. In this study, using Li 3 PO 4 as a lithium ion conductor and interface modifier, the crystal structure and electrochemical properties of LZTO are systematically studied and confirm that it is a faster lithium ion conductivity. Li 3 PO 4 not only accelerates Li-ion transport and increases diffusion paths, but also exhibits interfacial stability at high temperatures. Due to these advantages, the LZTO electrode containing the Li 3 PO 4 coating layer exhibits significantly improved electrochemical performance. The new Li 3 PO 4 coated LZTO electrode shows a large discharge specific capacity of 158.9 mAh g − 1 and a high capacity retention of 99% is obtained after 200 cycles at a rate of 5.0 A g − 1 and combined with cycle stability. Furthermore, the Li 3 PO 4 coated LZTO electrode also exhibits excellent low electrode polarization and high temperature long cycling performance for 500 cycles at temperatures up to 70 °C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Chi Chen,Changchun Ai,Yunwei He,Shi Yang,Yuanxin Wu
As compared to pure carbon (C) coating electrode materials, N-doped carbon (NC) decorating could further increase their electronic conductivity and interfacial stability, because the N element introduced into the carbon layer could create more C-vacancies and reduce the chemical activity of some surface ions. To verify this proposal, a series of N-doped carbon coated Li 2 ZnTi 3 O 8 anode materials (NCLZTO) are prepared by utilizing a one-step solid-state method in which acetyl glucosamine is used as the N-doped carbon source. The subsequent charge-discharge experiments reveal that the designed sample NCLZTO-2 possesses the optimal carbon content (7 wt%). And as expected, the NCLZTO-2 sample also exhibits a remarkable improvement in the electrochemical properties in comparison to pristine LZTO and pure carbon coated Li 2 ZnTi 3 O 8 (CLZTO). An initial discharge specific capacity of 264.2 mAh g −1 is reached by NCLZTO-2 and a reversible capacity of 248.6 mAh g −1 is still maintained after 500 cycles at 5 C with a capacity retention of 94.1%.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
固体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）