This title appears in the Scientific Report :
2022
Please use the identifier:
http://dx.doi.org/10.1021/acsami.1c22246 in citations.
Please use the identifier: http://hdl.handle.net/2128/31433 in citations.
Study of LiCoO 2 /Li 7 La 3 Zr 2 O 12 :Ta Interface Degradation in All-Solid-State Lithium Batteries
Study of LiCoO 2 /Li 7 La 3 Zr 2 O 12 :Ta Interface Degradation in All-Solid-State Lithium Batteries
The garnet-type Li7La3Zr2O12 (LLZO) ceramic solid electrolyte combines high Li-ion conductivity at room temperature with high chemical stability. Several all-solid-state Li batteries featuring the LLZO electrolyte and the LiCoO2 (LCO) or LiCoO2–LLZO composite cathode were demonstrated. However, all...
Saved in:
Personal Name(s): | Ihrig, Martin (Corresponding author) |
---|---|
Finsterbusch, Martin / Laptev, Alexander / Tu, Chia-hao / Tran, Ngoc Thanh Thuy / Lin, Che-an / Kuo, Liang-Yin / Ye, Ruijie / Sohn, Yoo Jung / Kaghazchi, Payam / Lin, Shih-kang / Fattakhova-Rohlfing, Dina / Guillon, Olivier | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | ACS applied materials & interfaces, 14 (2022) 9, S. 11288 - 11299 |
Imprint: |
Washington, DC
Soc.
2022
|
DOI: |
10.1021/acsami.1c22246 |
Document Type: |
Journal Article |
Research Program: |
Cell Design and Development |
Link: |
Get full text Published on 2022-02-28. Available in OpenAccess from 2023-02-28. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/31433 in citations.
The garnet-type Li7La3Zr2O12 (LLZO) ceramic solid electrolyte combines high Li-ion conductivity at room temperature with high chemical stability. Several all-solid-state Li batteries featuring the LLZO electrolyte and the LiCoO2 (LCO) or LiCoO2–LLZO composite cathode were demonstrated. However, all batteries exhibit rapid capacity fading during cycling, which is often attributed to the formation of cracks due to volume expansion and the contraction of LCO. Excluding the possibility of mechanical failure due to crack formation between the LiCoO2/LLZO interface, a detailed investigation of the LiCoO2/LLZO interface before and after cycling clearly demonstrated cation diffusion between LiCoO2 and the LLZO. This electrochemically driven cation diffusion during cycling causes the formation of an amorphous secondary phase interlayer with high impedance, leading to the observed capacity fading. Furthermore, thermodynamic analysis using density functional theory confirms the possibility of low- or non-conducting secondary phases forming during cycling and offers an additional explanation for the observed capacity fading. Understanding the presented degradation paves the way to increase the cycling stability of garnet-based all-solid-state Li batteries. |