Li2O Co-Sputtering을 통한 비정질 LLZO 고체전해질의 전기화학 특성 평가

박준섭; 김종헌; 김현석; Jun-Seob Park; Jong-Heon Kim; Hyun-Suk Kim

Korean Journal of Materials Research, Vol.31, No.11, 614-618, November, 2021

DOI10.3740/MRSK.2021.31.11.614 Export Citation

Li2O Co-Sputtering을 통한 비정질 LLZO 고체전해질의 전기화학 특성 평가

Evaluation of Electrochemical Properties of Amorphous LLZO Solid Electrolyte Through Li2O Co-Sputtering

박준섭, 김종헌, 김현석^†

충남대학교 신소재공학과

Jun-Seob Park, Jong-Heon Kim, and Hyun-Suk Kim^†

Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea

E-mail:

As the size of market for electric vehicles and energy storage systems grows, the demand for lithium-ion batteries (LIBs) is increasing. Currently, commercial LIBs are fabricated with liquid electrolytes, which have some safety issues such as low chemical stability, which can cause ignition of fire. As a substitute for liquid electrolytes, solid electrolytes are now being extensively studied. However, solid electrolytes have disadvantages of low ionic conductivity and high resistance at interface between electrode and electrolyte. In this study, Li7La3Zr2O12 (LLZO), one of the best ion conducting materials among oxide based solid electrolytes, is fabricated through RF-sputtering and various electrochemical properties are analyzed. Moreover, the electrochemical properties of LLZO are found to significantly improve with co-sputtered Li2O. An all-solid thin film battery is fabricated by introducing a thin film solid electrolyte and an Li4Ti5O12 (LTO) cathode; resulting electrochemical properties are also analyzed. The LLZO/Li2O (60W) sample shows a very good performance in ionic conductivity of 7.3 x 10-8 S/cm, with improvement in c-rate and stable cycle performance.

Keywords:all-solid-state thin-film lithium-ion battery;Li7La3Zr2O12;Li4Ti5O12;Li2O;co-sputtering

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[1] Dresselhaus MS, Thomas IL, Nature, 414, 332 (2001)

[2] Tarascon JM, Armand M, Nature, 414, 359 (2001)

[3] Armand M, Tarascon JM, Nature, 451, 652 (2008)

[4] Nishi Y, J. Power Sources, 100(1-2), 101 (2001)

[5] Schnell J, Gunther T, Knoche T, Vieider C, Kohler L, Just A, Keller M, Passerini S, Reinhart G, J. Power Sources, 382, 160 (2018)

[6] Balakrishnan PG, Ramesh R, Kumar TP, J. Power Sources, 155(2), 401 (2006)

[7] Li W, Dahn JR, Wainwright DS, Science, 264, 5162 (1994)

[8] Takada K, Inada T, Kajiyama A, Sasaki H, Kondo S, Watanabe M, Murayama M, Kanno R, Solid State Ion., 158(3-4), 269 (2003)

[9] Ohta S, Kobayashi T, Seki J, Asaoka T, J. Power Sources, 202, 332 (2012)

[10] Zheng F, Kotobuki M, Song SF, Lai MO, Lu L, J. Power Sources, 389, 198 (2018)

[11] Li L, Liu S, Gong Y, Wilkinson DP, Zhang J, Nano Energy, 33, 363 (2017)

[12] Duclot M, Souquet JL, J. Power Sources, 97, 610 (2001)

[13] Murugan R, Thangadurai V, Weppner W, Angew. Chem.-Int. Edit., 46, 7778 (2007)

[14] Xiao CF, Kim JH, Choi D, Park YC, Kim JH, Park J, Kim YJ, Kim HS, J. Alloy. Compd., 801, 550 (2019)

[15] Salih MA, Caglar A, Kivrak A, Kivrak H, Nanoscience Nanotechnology, 4, 132 (2017)

[16] Sen F, Karatas Y, Gulcan M, Zahmakiran M, RSC Adv., 4, 1526 (2014)

[17] Kimi H, Cho N, Nanoscale Res. Lett., 7, 408 (2012)

[18] Seo I, Martin SW, Inorg. Chem., 50(6), 2143 (2011)

[19] Geiger CA, Alekseev E, Lazic B, Fisch M, Armbruster T, Langner R, Fechtelkord M, Kim N, Pettke T, Weppner W, Inorg. Chem., 50(3), 1089 (2011)

[20] Lorger S, Usiskin R, Maier J, J. Electrochem. Soc., 166, 2215 (2019)

[21] Kalita DJ, Lee SH, Lee KS, Ko DH, Yoon YS, Solid State Ion., 229, 14 (2012)