Free-Standing Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>/Carbon Nanotube Electrodes for Flexible Lithium-Ion Batteries
Jun-Seok Lee,
Sang-Du Yun,
Oyunbayar Nyamaa,
Jeong-Hyeon Yang,
Sun-Chul Huh,
Hyo-Min Jeong,
Tae-Hyun Nam,
Yeon-Ju Ryu,
Jung-Pil Noh
Affiliations
Jun-Seok Lee
Department of Energy & Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong 53064, Republic of Korea
Sang-Du Yun
Department of Mechanical System Engineering, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong 53064, Republic of Korea
Oyunbayar Nyamaa
Department of Energy & Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong 53064, Republic of Korea
Jeong-Hyeon Yang
Department of Mechanical System Engineering, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong 53064, Republic of Korea
Sun-Chul Huh
Department of Energy & Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong 53064, Republic of Korea
Hyo-Min Jeong
Department of Energy & Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong 53064, Republic of Korea
Tae-Hyun Nam
Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
Yeon-Ju Ryu
Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju-daero 501, Jinju 52828, Republic of Korea
Jung-Pil Noh
Department of Energy & Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University, Tongyeonghaean-ro 2, Tongyeong 53064, Republic of Korea
Lithium-ion batteries (LIBs) have been used in many fields, such as consumer electronics and automotive and grid storage, and its applications continue to expand. Several studies have attempted to improve the performance of LIBs. In particular, the use of high-capacity silicon and tin as anodes has been widely studied. Although anodes composed of silicone and tin have high theoretical capacities, poor electrical conductivity and considerable volume expansion of such anodes deteriorate the LIB performance. Thus, Li4Ti5O12 (LTO), a zero-strain material, has attracted much attention with high cycle stability and rate capability through improved electrical conductivity. However, LTO has the disadvantages of a low electrical conductivity (10−8 to 10−13 S cm−1) and moderate Li+ ion diffusion coefficient (10−9 to 10−16 cm2 s−1). In this study, the flexible and free-standing composite films were fabricated using only LTO and multi-walled carbon nanotube(CNT) with high electrical conductivity and ion diffusivity. The prepared LTO/CNT films showed a higher charge/discharge capacity than the theoretical capacity of the LTO electrode.
