当前位置:
X-MOL 学术
›
ACS Appl. Energy Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Microstructural and Electrochemical Properties of Al- and Ga-Doped Li7La3Zr2O12 Garnet Solid Electrolytes
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-04-28 00:00:00 , DOI: 10.1021/acsaem.0c00347
Chao Chen 1, 2 , Yao Sun 1 , Linchun He 1 , Masashi Kotobuki 1 , Emil Hanc 1, 3 , Yu Chen 2, 4 , Kaiyang Zeng 1 , Li Lu 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-04-28 00:00:00 , DOI: 10.1021/acsaem.0c00347
Chao Chen 1, 2 , Yao Sun 1 , Linchun He 1 , Masashi Kotobuki 1 , Emil Hanc 1, 3 , Yu Chen 2, 4 , Kaiyang Zeng 1 , Li Lu 1, 2
Affiliation
![]() |
The Garnet-type solid electrolyte Li7La3Zr2O12 (LLZO) showing high ionic conductivity and a wide electrochemical potential window is considered as one of the most promising candidates for solid-state batteries. Among various doping derivatives, the Al- and Ga-doped LLZO electrolytes are intensively studied because of their ability to enhance the stability of the cubic structure and to promote good sinter ability as well. Despite showing great similarities in site preference and sintering behavior, the Al and Ga doping derivatives differ by 1 order of magnitude in total ionic conductivity. Therefore, a comparative study on the doping characteristics of Al and Ga with respect to ionic conductivity and sintering behavior is necessary. Herein, we simultaneously introduced Al and Ga into Li sites (AlxGa0.25–x-LLZO) to study their influences on the microstructure and electrochemical properties of LLZO. The results show that Ga doping enables a higher conductivity than Al doping and largely promotes sinter ability at the same time. Compared to Al single doping (Al0.25), Ga-contained compositions (x < 0.25) show significant grain growth. Moreover, a slight inclusion of Ga (Al0.20Ga0.05) not only modifies the sintering behavior that results in a microstructure transition from fine grains of Al0.25 (5–20 μm) to abnormally large grains (several hundred micrometers) but also greatly enhances the conductivity, yielding a value that is 3 times higher. However, further increases in Ga ratio in AlxGa0.25–x results in marginal increases in conductivity. The total conductivity reaches a maximum of 1.19 × 10–3 S cm–1 for Ga single doping (Ga0.25) at room temperature. In addition, Al0.25 also shows fast ion conducting behavior along the grain boundaries with a conductivity of 8.30 × 10–4 S cm–1. Consequently, this study sheds lights on the different doping characteristics between Al and Ga, providing guidance for fine composition engineering of these two promising dopants.
中文翻译:
Al和Ga掺杂的Li 7 La 3 Zr 2 O 12石榴石固体电解质的微观结构和电化学性能
石榴石型固体电解质Li 7 La 3 Zr 2 O 12(LLZO)具有高离子电导率和宽的电化学势能范围,被认为是固态电池最有希望的候选者之一。在各种掺杂衍生物中,由于铝和镓掺杂的LLZO电解质具有增强立方结构的稳定性和促进良好烧结性能的能力,因此对其进行了深入研究。尽管在位置偏好和烧结行为方面显示出极大的相似性,但Al和Ga掺杂衍生物的总离子传导率相差1个数量级。因此,有必要对Al和Ga的离子电导率和烧结行为进行比较研究。在此,我们同时将Al和Ga引入Li位置(Al x Ga 0.25– x-LLZO)来研究它们对LLZO的微观结构和电化学性能的影响。结果表明,Ga掺杂能够实现比Al掺杂更高的导电率,并且在很大程度上同时提高了烧结能力。与Al单一掺杂(Al 0.25)相比,含Ga的成分(x <0.25)显示出明显的晶粒长大。此外,少量的Ga(Al 0.20 Ga 0.05)不仅会改变烧结性能,从而导致微观结构从Al 0.25(5–20μm)的细晶粒过渡到异常大的晶粒(几百微米),而且还会大大增强电导率,其值是3倍。但是,Al x中的Ga比率进一步增加Ga 0.25– x导致电导率略有增加。在室温下,Ga单次掺杂(Ga 0.25)的总电导率最高为1.19×10 –3 S cm –1。此外,Al 0.25还显示出沿晶界的快速离子传导行为,电导率为8.30×10 –4 S cm –1。因此,本研究揭示了铝和镓之间不同的掺杂特性,为这两种有前途的掺杂剂的精细组成工程提供了指导。
更新日期:2020-04-28
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
Al和Ga掺杂的Li 7 La 3 Zr 2 O 12石榴石固体电解质的微观结构和电化学性能
石榴石型固体电解质Li 7 La 3 Zr 2 O 12(LLZO)具有高离子电导率和宽的电化学势能范围,被认为是固态电池最有希望的候选者之一。在各种掺杂衍生物中,由于铝和镓掺杂的LLZO电解质具有增强立方结构的稳定性和促进良好烧结性能的能力,因此对其进行了深入研究。尽管在位置偏好和烧结行为方面显示出极大的相似性,但Al和Ga掺杂衍生物的总离子传导率相差1个数量级。因此,有必要对Al和Ga的离子电导率和烧结行为进行比较研究。在此,我们同时将Al和Ga引入Li位置(Al x Ga 0.25– x-LLZO)来研究它们对LLZO的微观结构和电化学性能的影响。结果表明,Ga掺杂能够实现比Al掺杂更高的导电率,并且在很大程度上同时提高了烧结能力。与Al单一掺杂(Al 0.25)相比,含Ga的成分(x <0.25)显示出明显的晶粒长大。此外,少量的Ga(Al 0.20 Ga 0.05)不仅会改变烧结性能,从而导致微观结构从Al 0.25(5–20μm)的细晶粒过渡到异常大的晶粒(几百微米),而且还会大大增强电导率,其值是3倍。但是,Al x中的Ga比率进一步增加Ga 0.25– x导致电导率略有增加。在室温下,Ga单次掺杂(Ga 0.25)的总电导率最高为1.19×10 –3 S cm –1。此外,Al 0.25还显示出沿晶界的快速离子传导行为,电导率为8.30×10 –4 S cm –1。因此,本研究揭示了铝和镓之间不同的掺杂特性,为这两种有前途的掺杂剂的精细组成工程提供了指导。