Abstract
Rapidly-growing demand for wearable and flexible devices is boosting the development of flexible lithium ion batteries (LIBs). The exploitation of flexible electrodes with high mechanical properties and superior electrochemical performances has been a key challenge for the rapid practical application of flexible LIBs. Herein, a flexible composite electrode was prepared from the mixed solutions of Li[Li0.2Ni0.13Co0.13Mn0.54]O2 (LLOs), carbon nanotubes(CNTs), and nanofibrillated celluloses (NFCs) via a vacuum filtration method. The resulting LLOs/CNTs/NFCs electrode delivered an initial discharge capacity of 253 mAh g−1 at 0.1 C in the voltage range from 2.0 to 4.6 V, and retained a reversible capacity of 178 mAh g−1 with 83% capacity retention after 100 cycles at 1 C. The LLOs/CNTs/NFCs electrode exhibited excellent flexibility along with repeated bending in the bending test. The LLOs/CNTs/NFCs electrode after bending test remained a discharge capacity of 149 mAh g−1 after 100 cycles at 1 C, and the corresponding capacity retentions was 76%. The excellent electrochemical performance and high flexibility can be ascribed to the framework formed by CNTs with high conductivity and NFCs with good mechanical properties. The results imply that the as-fabricated electrode can be a promising candidate for the flexible LIBs.
Highlights
Along with the rise and development of the wearable and flexible electronic products, the concept of flexible devices emerges at the right moment and engulfes the entire world (Manthiram et al, 2008; Kim and Cho, 2010; Agnès et al, 2014)
The other evident peak centered at 1,095 cm−1 was assigned to the asymmetric stretching vibration mode of C–O in the nanofibrillated celluloses (NFCs) (Leijonmarck et al, 2013)
These results revealed that the as-prepared electrode was composed of Lithium-rich layered oxides (LLOs) and small amount of NFCs and CNTs, and the crystalline structure of LLOs were maintained well in the composite electrode
Summary
Along with the rise and development of the wearable and flexible electronic products, the concept of flexible devices emerges at the right moment and engulfes the entire world (Manthiram et al, 2008; Kim and Cho, 2010; Agnès et al, 2014). Wang et al developed a flexible LiFePO4/graphene/NFC electrode with the mechanical support of NFC, and the composite electrode shows high flexibility as well as excellent electrochemical properties (Wang et al, 2018). The resulting LLOs/CNTs/NFCs composite electrode exhibited good electrochemical performance as well as high flexibility, which can be ascribed to the three-dimensional conductive framework formed by NFCs and CNTs. Synthesis and Characterization
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