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影响因子：12.1

DOI码：10.1002/smll.202503375

发表刊物：Small

关键字：carbon nanotubes, additives, grafting, interphase, energy density, lithium-ion batteries

摘要：Carbon materials are the key additives for electronic conductivity in electrodes, which determine the electrochemical performances and durability of batteries. Herein, a strategy for grafting ion-conducting groups to multi-wall carbon nanotubes (MWCNTs) is proposed via in situ polymerization induced by a Lewis acid agent BF3, which is generated from the disproportionation of LiBC2O4F2 (LiODFB). The as-obtained MWCNTs demonstrate a narrower particle size distribution in the solution due to the reduced surface defects and steric effect between the grafted oxyethylene (EO) segments. Moreover, the MWCNTs with ion-conducting groups (CNT-EO) show not only good electronic/ionic dual conductivity but also high chemical- and electrochemical- stability up to 4.8 V with the LiNi0.8Co0.1Mn0.1O2 (NCM811) electrode. The CNT-EO integrates the cathode into a monolithic structure through an interconnected 3D dual conductive network, which accelerates the construction of a robust LiF-dominated interphase layer on NCM811. Therefore, the Li/NCM811 cells with CNT-EO additive deliver a high discharge capacity of 183.5 mAh g−1 at 0.5 C, and a significantly improved cycle life of 400 cycles. The strategy of grafting special functional groups to the CNTs is beneficial to construct a stable charge carrier transport interface for electrodes with high-energy density, long life, and high safety.

论文类型：期刊论文

论文编号：2503375

学科门类：工学

文献类型：J

卷号：21

期号：25

是否译文：否

发表时间：2025-05-12

收录刊物：SCI