Three-dimensional carboxymethyl cellulose sponge-like ultralight electrode for lithium-ion batteries
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In order to reduce the weight of the lithium-ion battery and increase its capacity, the copper foil as a conventional current collector is completely abandoned, and a novel ultralight negative electrode prepared by freeze-drying technology and carboxymethyl cellulose (CMC) has a 3D sponge-like structure. Further, graphite is employed as an electrode material. X-ray diffraction and Raman spectroscopy show no damage to the graphite structure during the formation of the carbon sponge. The thin layer of acetylene black deposit acts as a current collector and allows graphite to maximize contact with the electrolyte. In the half-cell experiment, this new 3D CMC spongy ultralight collector-free electrode achieves considerable cyclical stability. This paper describes innovative and fairly simple techniques to fully realize 3D CMC sponge-like current collector applied in lithium-ion battery, rather than relatively heavy and expensive copper foil, thereby improving the weight and volumetric energy density of such advanced batteries.
Keywords3D sponge-like ultralight electrode Lithium-ion batteries Anode materials
This study received financial support from the Natural Science Foundation of China (51803114) and the Scientific Research Fund of Shaanxi University of Science and Technology (2016QNBJ-15), the Innovative Talents Promotion Plan in Shaanxi Province (2018KJXX-023), the Natural Science Foundation of Shaanxi Province in China (2017JM2017), and the Scientific Research Foundation of Shaanxi Provincial Education Department (18JS013).
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