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Optimized Pinecone-Squama-Structure MoS<sub>2</sub>-Coated CNT and Graphene Framework as Binder-Free Anode for Li-Ion Battery with High Capacity and Cycling Stability
oleh: Hanwen Jian, Tongyu Wang, Kaiming Deng, Ang Li, Zikun Liang, Erjun Kan, Bo Ouyang
Format: | Article |
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Diterbitkan: | MDPI AG 2023-04-01 |
Deskripsi
Extensive research has been conducted on the development of high-rate and cyclic stability anodes for lithium batteries (LIBs) due to their high energy density. Molybdenum disulfide (MoS<sub>2</sub>) with layered structure has garnered significant interest due to its exceptional theoretic Li<sup>+</sup> storage behavior as anodes (670 mA h g<sup>−1</sup>). However, achieving a high rate and long cyclic life of anode materials remains a challenge. Herein, we designed and synthesized a free-standing carbon nanotubes-graphene (CGF) foam, then presented a facile strategy to fabricate the MoS<sub>2</sub>-coated CGF self-assembly anodes with different MoS<sub>2</sub> distributions. Such binder-free electrode possesses the advantages of both MoS<sub>2</sub> and graphene-based materials. Through rational regulation of the ratio of MoS<sub>2</sub>, the MoS<sub>2</sub>-coated CGF with uniformly distributed MoS<sub>2</sub> exhibits a nano pinecone-squama-like structure that can accommodate the large volume change during the cycle process, thereby significantly enhancing the cycling stability (417 mA h g<sup>−1</sup> after 1000 cycles), ideal rate performance, and high pseudocapacitive behavior (with a 76.6% contribution at 1 mV s<sup>−1</sup>). Such a neat nano-pinecone structure can effectively coordinate MoS<sub>2</sub> and carbon framework, providing valuable insights for the construction of advanced anode materials.