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- W4300861724 abstract "Silicon (Si) is an ideal anode materials of lithium-ion batteries (LIBs) due to its ultrahigh theoretical capacity. However, its commercialization is severely hampered because the intrinsic poor electrical conductivity and huge volume expansion during lithiation/delithiation process lead to rapid capacity decay. Designing Si/carbon composite is a feasible way for enhancing performance of Si. Here, a porous N-doped carbon [email protected] nanoparticles ([email protected]) microcapsules was prepared by encapsulating Si nanoparticles (SiNPs) into zeolitic imidazolate frameworks-90 (ZIF-90), coating covalent-organic frameworks (COFs) with well-ordered pores around [email protected], etching ZIF-90, and calcining [email protected] under N2 in turn. The porous N-doped carbon nanocages derived from COFs formed three-dimensional protective shells around SiNPs, which not only improved the electrical conductivity of microcapsules but also provided more buffer space for volume expansions of SiNPs to slow down the attenuation of capacity. When applying for the anode of LIBs, the obtained [email protected] microcapsules showed high capacity of 1015 mAh g−1 at 100 mA g−1 after 100 cycles and good cycling stability. The approximate theoretical capacity contribution of Si can be up to 2363 mAh g−1. Combining with the benefits of both carbon nanocages derived from COFs (stability and recyclability) and Si (high capacity), this work developed a promising material for LIBs." @default.
- W4300861724 created "2022-10-04" @default.
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- W4300861724 date "2022-12-01" @default.
- W4300861724 modified "2023-10-16" @default.
- W4300861724 title "A N-doped carbon nanocages@silicon nanoparticles microcapsules for high-performance Li-storage" @default.
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- W4300861724 doi "https://doi.org/10.1016/j.compositesb.2022.110334" @default.
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