Monolithic Graphene Trees as Anode Material for Lithium Ion Batteries with High C‐Rates |
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| Authors: | Seung Yol Jeong Sunhye Yang Sooyeon Jeong Ick Jun Kim Hee Jin Jeong Joong Tark Han Kang‐Jun Baeg Geon‐Woong Lee |
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| Affiliation: | 1. Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Republic of Korea;2. Department of Electrical Functionality Material Engineering, University of Science and Technology (UST), Daejon, Republic of Korea;3. Battery Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Republic of Korea;4. Multidimensional Nanomaterials Research Group, Korea Electrotechnology Research Institute (KERI), Changwon, Republic of Korea |
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| Abstract: | Monolithically structured reduced graphene oxide (rGO), prepared from a highly concentrated and conductive rGO paste, is introduced as an anode material for lithium ion batteries with high rate capacities. This is achieved by a mixture of rGO paste and the water‐soluble polymer sodium carboxymethylcellulose (SCMC) with freeze drying. Unlike previous 3D graphene porous structures, the monolithic graphene resembles densely branched pine trees and has high mechanical stability with strong adhesion to the metal electrodes. The structures contain numerous large surface area open pores that facilitate lithium ion diffusion, while the strong hydrogen bonding between the graphene layers and SCMC provides high conductivity and reduces the volume changes that occur during cycling. Ultrafast charge/discharge rates are obtained with outstanding cycling stability and the capacities are higher than those reported for other anode materials. The fabrication process is simple and straightforward to adjust and is therefore suitable for mass production of anode electrodes for commercial applications. |
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| Keywords: | C‐rates lithium ion batteries monolithic structures reduced graphene oxide sodium carboxymethylcellulose |
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