CuO nanoflowers/copper fiber felt integrated porous electrode for lithium-ion batteries
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O nanoflowers/copper fiber felt integrated porous electrode for lithium-ion batteries *
YUAN Wei , YE YinTong, YANG Yang, ZHANG XiaoQing, PAN BaoYou, PENG ZiMing, WU MuLun, QIU ZhiQiang, WANG Chun, YUAN YuHang, YAN ZhiGuo & TANG Yong School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China Received January 19, 2020; accepted April 20, 2020; published online July 1, 2020
The structure of current collectors has significant effects on the performance of a lithium-ion battery (LIB). In this study, we use copper fiber felts made by multi-tooth cutting and high-temperature solid-phase sintering as the current collector for LIBs. An integrated porous electrode based on CuO nanoflowers/copper fiber felt is developed for the anode. Results suggest that the reversible capacity and cycle stability of this new anode are significantly improved, compared with the pristine bare-surface copper plate under the same condition of rate cycles. The new anode structure based on the copper-fiber felt with a porosity of −1 −1 60% exhibits a higher performance with an initial specific capacity of 609.5 mAh g and retains 486.1 mAh g after 200 cycles at a current density of 0.5 C. The improved electrochemical performance of this electrode is attributed to its large surface area of CuO nanoflowers and porous structure of the copper fiber felt, due to enhanced contact between the active material of CuO nanoflowers and electrolyte. This pore-rich structure makes the electrolyte easy to permeate into the electrode, shortens the + diffusion path of Li , reduces the internal resistance and alleviates the volume expansion of the active material during the + insertion and desertion processes of Li . lithium-ion battery, integrated electrode, copper fiber felt, CuO nanoflowers, multi-tooth cutting Citation:
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Yuan W, Ye Y T, Yang Y, et al. CuO nanoflowers/copper fiber felt integrated porous electrode for lithium-ion batteries. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-020-1608-x
Introduction
As an energy storage device with an excellent performance, the lithium-ion battery (LIB) has been widely used in portable devices, electric vehicles and many other fields [1–3]. Large-scale application of LIBs depends on its long cycle life, low self-discharge rate and high-security operation [4–6]. However, with the development of new-energy technology, LIBs are required to be more competent in specific capacity, discharge voltage and safety performance. Commercial LIBs commonly use graphite as the anode active −1 material with a theoretical capacity of 372 mAh g , which cannot meet the demands for next-generation power sources
*Corresponding author (email: [email protected])
[7–11]. To solve the problem of low capacity density of the anode, it is of great importance to develop new types of anode active materials to overcome the current predicament. Compared with commercial graphite materials, the transition metal oxides (TMOs) have larger specific capacity and higher discharge voltag
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