Sponge-Like Li4Ti5O12 Constructed on Graphene for High Li Electroactivities
- Authors
- Bae, Seongjun; Nam, Inho; Park, Soomin; Yoo, Young Geun; Park, Jongseok; Lee, Jong Min; Han, Jeong Woo; Yi, Jongheop
- Issue Date
- Jan-2017
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Lithium Ion Battery; Anode; Li4Ti5O12; Graphene; Nanostructure
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.17, no.1, pp 588 - 593
- Pages
- 6
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 17
- Number
- 1
- Start Page
- 588
- End Page
- 593
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/64061
- DOI
- 10.1166/jnn.2017.12447
- ISSN
- 1533-4880
1533-4899
- Abstract
- A sponge-like Li4Ti5O12/graphene composite was prepared via sequential hydrothermal process and solid-state heat treatment process for the application to high-power lithium ion batteries. The as-prepared electrode showed outstanding Li electroactivities with a rapid and reversible Li insertion/extraction of up to 10 C-rate (1.75 A/g). It delivered a discharge capacity of 174 mAh/g at 0.5 C, near the theoretical capacity of Li4Ti5O12, with good rate capability and cyclic stability. First-principles calculations revealed the intimate interaction of the Li4Ti5O12 and graphene, which implies that graphene functions as an 'electron tunnel.' Electrochemical impedance spectroscopy also proved that the graphene-hybridization and the unique structure of the Li4Ti5O12 material significantly reduce the resistive behavior of electrodes. The 3D structured Li4Ti5O12/graphene hybrid reported herein could be a promising candidate for a safe, low-cost, high-power anode for lithium ion batteries, and our seeding-growth-sintering method for decorating graphene with active material will offer an effective upgrade on highly insulating Li4Ti5O12 materials.
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