Carbon-free Mn-doped LiFePO4 cathode for highly transparent thin-film batteries
- Authors
- Lee, HyunSeok; Kim, Sang tae; Parmar, Narendra Singh; Song, Jong-Han; Chung, Kyung-yoon; Kim, Kwang-Bum; Choi, Ji-Won
- Issue Date
- Sep-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Lithium thin-film battery; Transparent; Olivine; LiFe1-xMnxPO4
- Citation
- JOURNAL OF POWER SOURCES, v.434, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 434
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/12523
- DOI
- 10.1016/j.jpowsour.2019.226713
- ISSN
- 0378-7753
- Abstract
- The search for transparent battery cathodes primarily focuses on patterned electrodes with feature sizes below the optical absorption limit. This significantly limits the electrode capacity, as a large electrode area remains unused to maintain transparency. Herein, we report transparent olivine LiFe0.77Mn0.23PO4 thin-film electrodes discovered through high-throughput continuous-composition-spread sputtering. After investigating six different Mn doping ratios, we found the optimal Mn-doped olivine composition with an enhanced discharge capacity of 45.7 mu A h/cm(2).mu m without using excessive nanosized features or carbon coating. The thin-film electrode exhibits a clear redox activity for both Fe3+/2+ and Mn3+/2+, resulting in an enhanced average voltage over LiFePO4 composition. A 250-nm-thick film exhibits an optical transmittance of over 80% in the visible region. The results in this study demonstrates that transparent cathode thin films can be developed based on phospho-olivines via doping strategies with high-throughput continuous-composition-spread sputtering methods.
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