JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Run Yu,Yongjin Chen,Chengyu Li,Shaojun Wang,Pengcheng Li,Ruihan Tang,Cong Gao,Chuanlong Lin,Xiang Gao
The garnet-type oxide Li 7 La 3 Zr 2 O 12 solid-state electrolytes (SSEs) are considered as a reliable option in all-solid-state lithium batteries (ASSLBs) due to its excellent properties. However, it still faces challenges such as limited ionic conductivity and low air stability. In this work, Ga 3+ and Ta 5+ co-doped samples Li 7−3 x − y Ga x La 3 Zr 2− y Ta y O 12 (Ga x Ta y -LLZO) synthesized via the solid-state method are demonstrated to stabilize the cubic phase, regulate the concentration of Li vacancies in LLZO, and improving the Li + transport channels. As a result, the Ga0.1Ta0.3-LLZO sample achieves a high conductivity of ∼1 mS cm −1 . Furthermore, we discovered that in addition to the previously reported effects of decreasing grain boundary density and the inert LiGaO 2 secondary phase at grain boundaries, the synergistic effect of introducing multiple dopant ions, which enhances lattice stability, is also a key factor contributing to improved air stability. Our findings demonstrate that co-doping strategy with Ga 3+ /Ta 5+ is an effective method for simultaneously enhancing conductivity and air stability of LLZO, laying solid foundation for the application of SSEs in ASSLBs.
研究领域:
材料科学
·
电池技术
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产品关联
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2016
·Vol. 14
·期 2
·503-507
·
IF 1.3
Wang Hongtao,Miao Hui
In this study, dense polytetrafluoroethylene (PTFE)/Sn 1− x
Ga
x
P 2 O 7 ( x = 0.05, 0.10, 0.15, 0.20) inorganic–organic composite electrolytes were prepared. The result of SEM images indicates that all the composite electrolytes are sufficiently uniform and dense. The conductivities which is given consideration to the influence of Ga 3+ doping level increase in the order: σ ( x = 0.20) < σ ( x = 0.15) < σ ( x = 0.10) < σ ( x = 0.05). The highest conductivity 1.9 × 10 −2 S cm −1 is observed for PTFE/Sn 1− x
Ga
x
P 2 O 7 ( x = 0.05) in wet O 2 at 225 °C. The H 2 /O 2 fuel cells using PTFE/Sn 1− x
Ga
x
P 2 O 7 ( x = 0.05, 0.10) as electrolytes generate the maximum power densities of 63 mW cm −2 for x = 0.05 and 36.3 mW cm −2 for x = 0.10 at 150 °C, respectively.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zezhen Yin,Yun Zhang,Shihua Ding,Tianxiu Song,Xiaoning Li,Jiaying Dan
The solid-phase method was utilized to synthesize LiAl 1- x Be x O 2- x /2 and LiAl 1- x Ga x O 2 ceramics. By Phillips-Van Vechten-Levine (P-V-L) theory, a strong correlation between chemical bond characteristics and microwave dielectric properties was established. X-ray diffraction (XRD) analysis confirmed that all components formed single-phase solid solution with tetragonal structure. Using Be 2+ and Ga 3+ as substitutes, the differences in ionic radii produced diametrically opposite changes in cell volume. The relative density increased to 97.61 % (98.57 %) with the addition of Be 2+ (Ga 3+ ). According to the P-V-L theory, the variation of ε r was influenced by bond ionization. The introduction of different ions caused bond lengths variations, which in turn affected the lattice energy fluctuations. Importantly, this change more than doubled Q×f from 16,268 GHz to 37,015 GHz. Furthermore, the evolution of τ f can be elucidated by the bond energy. Sintered at 1250 °C, both LiAl 0.96 Be 0.04 O 1.98 and LiAl 0.98 Ga 0.02 O 2 demonstrated outstanding microwave dielectric properties, characterized by ε r = 5.83–6.08, Q×f = 32,727∼37,015 GHz, and τ f = −134.8∼-112.4 ppm/°C.
研究领域:
材料科学
·
无机化学
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 41
·e03562
·
IF 26.8
Shangqing Qu,Tianhao Niu,Xianji Qiao,Yanran Shen,Guohong Cai,Xiaoge Wang,Yonggang Wang,Zhipeng Zhou,Shipeng Zhang,Zeyue Zhang,Guobao Li,Guanqun Cai,Junliang Sun
Na- β ″-Al 2 O 3 is a highly promising solid-state electrolyte (SSE) for solid-state sodium batteries (SSSBs) with a wide electrochemical stability window and excellent stability against metallic sodium. However, its practical application is hindered by the instability of β ″ phase ( R 3 ¯ $\bar 3$ m ) during sintering, low polycrystalline ionic conductivity at room temperature, and poor interfacial contact with sodium anodes. In this study, a stablized SSSB is obtained via doping Ga 3+ into Na 1.67 Mg 0.67 Al 10.33 O 17 (NMAO), which also suppresses the formation of the β ′ phase ( P 6 3 / mmc ) and decreases stacking faults. After sintering at 1550 °C for 2 h, Na 1.67 Mg 0.67 Al 9.33 GaO 17 (NMA9.33GO) exhibits an ionic conductivity of 9.2 × 10 −4 S cm −1 at 30 °C, ≈1.7 times greater than NMAO. Furthermore, Ga 3+ doping enhances the wettability with sodium, achieving superior contact stability and the formation of Na-Ga alloys at the interface significantly improves electrode-electrolyte contact stability, achieving a high critical current density (CCD) of 0.8 mA cm −2 and a low interfacial impedance of 16 Ω cm 2 . A quasi-solid-state battery assembled with Na 3 V 2 (PO 4 ) 3 (NVP) as the cathode demonstrates excellent cycling stability and rate performance, retaining a high discharge capacity of 91 mAh g −1 at 5 C, and maintaining 87% capacity retention after 1000 cycles at 1 C. This work provides new insights into improving electrolyte performance and interfacial engineering through doping strategies, thereby promoting the development of efficient and long-term SSSBs.
研究领域:
材料科学
·
电化学
·
储能
·
固态电池
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 4
·1621-1629
·
IF 4.912
Yachao Du,Qingwen Tian,Jin Huang,Yuechao Zhao,Xiaohuan Chang,Afei Zhang,Sixin Wu
Additional elements in Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers present a viable strategy to improve the performance of thin film solar cells. In this study, heterovalent cation doping by partially substituting metal cations with Ga3+ is explored by constructing a sandwich-like configuration. We demonstrated that a low doping level of Ga3+ can be successfully incorporated into the host lattice of CZTSSe to form a homogeneous Cu2ZnSn(Ga) (S,Se)4 (CZTGSSe) alloy material. Characterization was performed using SEM, EDS, XRD, Raman spectroscopy, and XPS, which showed that the material fabricated by this heterovalent cation doping method expressed high phase purity, appropriate valence components, and suitable optical bandgap, which are vital for high performance solar cells. As a result, the champion device achieves stabilized efficiency as high as 10.80%, improved by nearly 28% compared with only 8.43% for the reference device.
研究领域:
材料科学
·
太阳能
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）