JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Huan Zhao,Xiaobao Zhang,Ning Wang,Yiyang Xiao,Shiang Liang,Weidong Zhuang,Juanyu Yang,Xiaowei Huang
The composite solid electrolyte (CSE), polyethylene oxide (PEO)-Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO), is deemed a promising candidate for all-solid-state batteries. Nevertheless, due to the poor interfacial compatibility between LLZTO nanoparticles and PEO, achieving a homogeneous dispersion of LLZTO nanoparticles within PEO is not readily attainable. The aggregation of LLZTO within PEO leads to a decline in the ionic conductivity of the CSE and poor interface stability with the electrode, ultimately resulting in deteriorated battery cyclic performance. In this work, the interface between LLZTO and PEO is designed and comprehensively investigated. Initially, dopamine self-polymerization is employed to form a uniform coating layer on the surface of LLZTO nanoparticles. Subsequently, by utilizing the amino groups present in polyethyleneimine (PEI), which can react with the phenolic hydroxyl groups of dopamine and the ether linkages in PEO, PEI serves as a bridging agent, enhancing the interfacial compatibility between LLZTO and PEO. Here it is shown that, the ionic conductivity of the LLZTO-PEO CSE containing 40 wt% modified LLZTO increases from 6.14✕10 −5 S cm −1 to 1.89✕10 −4 S cm −1 . Furthermore, this CSE exhibits improved thermal stability, an enlarged electrochemical window of 4.8 V, a lithium-ion transference number of 0.45, and excellent interface stability with the lithium anode. The assembled LiFePO 4 | 40 wt% LLZTO@PDA@PEI-PEO CSE | Li all-solid-state battery demonstrates an initial discharge specific capacity of 151.8 mA h g −1 at 0.2 C, with a capacity retention of 85.8% after 200 cycles. This work provides a novel strategy for interface-modified polymer- inorganic composite solid electrolytes, which will advance the development of high-energy-density all-solid-state lithium batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Zeya Huang,Rong-ao Tong,Jian Zhang,Linhui Chen,Chang-An Wang
Composite solid electrolytes (CSEs) are considered as one of the important candidates for solid-state batteries . The conventional solvent-cast method that using an organic solvent to disperse polymer and ceramic particles has high cost and low efficiency. The agglomeration of ceramic particles in the solution and the residual solvent in CSEs also have side effects on the performance of the solid-state battery. A new technique to prepare composite solid electrolytes by internal-mix method to blend ceramic particles and polymers without any solvent has been proposed in this article. To contrastively study the internal-mix and solvent-cast methods, CSE samples with 50 wt% Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) and 50 wt% PEO polymer were prepared by the two methods and characterized by XRD , SEM, FTIR TG-DTA and DSC . The internal-mix process is free of any solvent, and thus no agglomeration or solvent remain in the polymer matrix . CSE prepared by the internal-mix process has less undesired Li 2 CO 3 and no residual solvent, thus exhibiting better thermal and electrochemical stability. All-solid-state battery with CSE prepared by internal-mix shows improved cycle performance than that prepared by solvent-cast. Environmentally friendly and low-cost preparation of PEO-based CSEs could be realized with the internal-mix method, and this technique is suitable for large-scale manufacture.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Mingyu Yang,Kui Liu,Longcheng Yang,Guoren Yang,Lan Tong,Xianqing Liu,Fang Xu
Herein, first-principles calculations predicted the atomic-scale variation of Sb 5+ substitution for ZnZrTa 2 O 8 , and combined with the solid-phase reaction method to prepare ZnZr(Ta 1- x Sb x ) 2 O 8 (0.0 ≤ x ≤ 0.10) ceramics. ZnZr(Ta 0.94 Sb 0.06 ) 2 O 8 ceramics demonstrated the optimum microwave dielectric properties after sintering at 1350 °C for 6 h: ε r = 24.92, Q × f = 134053 GHz (@7.18 GHz), and τ f = −46.21 ppm/°C. For the non-intrinsic factors, the relative density increased from 96.54 % to 97.74 % and the average grain size increased from 19.88 μm to 21.85 μm, both of which reduced the dielectric loss . Regarding intrinsic factors, the progressive elevation of the Raman characteristic peak wave number and the heightened ionicity of Ta/Sb–O bonds predominantly account for the observed enhancement in εr. In addition, the attenuation of lattice vibrational damping behavior, the augmentation in electron cloud density, and the escalation of lattice energy collectively contribute to a decrement in dielectric loss . This study refines the examination of ionic substitution in ZnZrTa 2 O 8 ceramics, offering theoretical insights for optimizing their dielectric properties and promoting their application in microwave communications.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Yuhui Chen,Ruolin Zhang,Shen Hu,Pengyang Jiang,Jun Song,Xiani Huang
In this study, the corrosion resistance and thermal shock resistance of Sc x Ta 0.5−x YSZ (x = 0, 0.05, 0.25, 0.45, and 0.5 mol%) coatings prepared via the solid-state reaction method were compared and evaluated. The corrosion resistance and thermal shock resistance of different materials were analyzed using X-ray diffraction, field-emission scanning electron microscopy, energy-dispersive spectrometry, and stereomicroscopy. Results show that Sc 0.25 Ta 0.25 YSZ has the best corrosion resistance and thermal shock resistance among all tested materials and the number of thermal cycles exceeds 679 at 1150 °C. The excellent properties can be attributed to the small ionic radius of Sc 3+ in the Sc 0.25 Ta 0.25 YSZ composite, which gives the material good thermal stability at high temperatures. In the corrosion process, Sc 0.25 Ta 0.25 YSZ forms highly stable zirconia tantalum , affording good corrosion resistance.
研究领域:
材料科学
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陶瓷
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高温材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）