Directly-prelithiated carbon nanotube film for high-performance flexible lithium-ion battery electrodes |
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| Authors: | Sehyun Lee Hyeonjun Song Jun Yeon Hwang Youngjin Jeong |
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| Institution: | 1.Department of Organic Materials and Fiber Engineering,Soongsil University,Seoul,Korea;2.Department of Information Communication, Materials, and Chemistry Convergence Technology,Soongsil University,Seoul,Korea;3.Carbon Composite Materials Research Center, Institute of Advanced Composite Materials,Korea Institute of Science and Technology (KIST),Wanju,Korea |
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| Abstract: | Carbon nanotube (CNT) films are very flexible and serve as active materials for lithium-ion batteries (LIBs). Hence, they have high potential as flexible free-standing electrodes for wearable batteries. However, nanocarbon materials such as CNTs and graphene are of limited use as electrodes because they have a large initial irreversible capacity due to the formation of a solid electrolyte interphase (SEI). Herein, we prelithiated the CNT films to make them available as electrodes for flexible batteries by reducing their irreversible capacity. The SEI is pre-formed through a direct prelithiation (DP) method that brings lithium metal into direct contact with CNT films in an electrolyte. As a result, the capacity of directly-prelithiated CNT film electrodes continues to increase to 1520 mAh/g until 350th cycle of charge/discharge and their initial irreversible capacity vanishes. The changes in the electrochemical properties of CNT film electrodes by DP treatment and their flexibility are investigated. |
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