Effect of the Lithiophilicity of the Li Host of a Carbon Nanotube Film on the Performance of Li Metal Battery
Vol. 58, No. 2, pp. 106-112,
Apr. 2021
10.12772/TSE.2021.58.106
PDF
Abstract
Lithium (Li) has gained attention as an anode material because of its high specific
capacity (3860 mAh g-1) and high energy density. However, its commercialization is
limited owing to the dendrite growth on the surface of the electrode, which causes several
drawbacks, such as low cycling stability, and safety issues, such as short circuits due to the
penetration of the separator. Li hosts with various structures have been studied to address
these problems. A 3D-scaffold structured host effectively suppresses the Li dendrite
growth and improves the electrode performance. Carbon nanotube (CNT) is a promising
candidate material for a Li host owing to its high surface area and excellent electrical conductivity.
However, the lithiophobicity of CNT makes it difficult to utilize CNT as a Li host. In
this study, we tried to improve the lithiophilicity of CNT film by direct pre-lithiation method
and studied the effect of lithiophilicity on the performance of Li metal battery. Li could be
uniformly plated inside the lithiophilic CNT film in contrast to lithiophobic CNT film, where
it was plated unevenly on the surface. This Li plating behavior was reflected in the performance
of the full cell, in which LiFePO4 (LFP) was used as a cathode. The full cell (LFP∥
lithiophilic CNT film) exhibited remarkable cyclability owing to uniform Li plating inside
lithiophilic CNT film.
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