Cellulose-derived tin-oxide-nanoparticle-embedded carbon fibers as binder-free flexible Li-ion battery anodes
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Cellulose has attracted attention as a biomass carbon precursor owing to its abundant reserves and unique properties such as a hierarchical fibrous structure and good mechanical properties. Here, we fabricate cellulose-derived carbon fibers via a facile electrospinning and carbonization process by using cellulose acetate precursor. The prepared carbon fibers are directly used as binder-free flexible anodes for Li ion batteries. They exhibit a high initial reversible specific capacity of 555 mA h g−1 with better cycling stability than carbonized commercial cellulose electrodes. To design extensive lithium storage electrodes, cellulose-derived carbon fiber/SnO2 composites are fabricated through electrospinning. In order to prevent the degradation of the active material, we encapsulate SnO2 nanoparticles in cellulose-derived carbon fibers with a large amount of SnO2 (46.4 wt%), which is evenly dispersed in the fibrous carbon matrix. Cellulose-derived carbon fiber/SnO2 electrodes reveal a high reversible capacity of 667 mA h g−1 and stable cycling retention of 76% over 100 cycles at 200 mA g−1, which signify much better cycling performance than commercial SnO2 nanoparticles. These properties are reflected in the advantages of cellulose-derived carbon fiber/SnO2 composite electrodes such as high reactivity, good mechanical properties, and high electrical conductivity that originate from the cellulose-based fibril nanostructure.
KeywordsCellulose Carbon fiber Tin oxide nanoparticle Electrospinning Lithium ion battery
This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT (2016R1A2B2012728 and NRF-2018M3D1A1058744) and by the R &D Center for Valuable Recycling(Global-Top R&BD Program) of the Ministry of Environment (Project No.: R2-17-2016002250005).
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