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).
- 3.Yamagata M, Nishigaki N, Nishishita S, Matsui Y, Sugimoto T, Kikuta M, Higashizaki T, Kono M, Ishikawa M (2013) Charge–discharge behavior of graphite negative electrodes in bis (fluorosulfonyl) imide-based ionic liquid and structural aspects of their electrode/electrolyte interfaces [J]. Electrochim Acta 110:181–190CrossRefGoogle Scholar
- 11.Izadi-Najafabadi A, Yasuda S, Kobashi K, Yamada T, Futaba DN, Hatori H, Yumura M, Iijima S, Hata K (2010) Extracting the full potential of single-walled carbon nanotubes as durable supercapacitor electrodes operable at 4 V with high power and energy density [J]. Adv Mater 22(35):E235–E241CrossRefGoogle Scholar