材料科学
阳极
相间
电解质
化学工程
导电体
相(物质)
硅
聚丙烯酸
纳米纤维
纳米技术
复合材料
聚合物
光电子学
电极
有机化学
化学
遗传学
物理化学
工程类
生物
作者
Li Ma,Youyou Fang,Ning Yang,Ning Li,Lai Chen,Duanyun Cao,Yun Lu,Qing Huang,Tinglu Song,Yuefeng Su,Feng Wu
标识
DOI:10.1002/adma.202404360
摘要
Abstract The poor bulk‐phase and interphase stability, attributable to adverse internal stress, impede the cycling performance of silicon microparticles (μSi) anodes and its commercial application for high‐energy‐density lithium‐ion batteries. In this work, we propose a groundbreaking gradient‐hierarchically ordered conductive (GHOC) network structure, ingeniously engineered to enhance the stability of both bulk‐phase and the solid electrolyte interphase (SEI) configurations of μSi. Within the GHOC network architecture, two‐dimensional transition metal carbides (Ti 3 C 2 T x ) acts as a conductive “brick”, establishing a highly conductive inner layer on μSi, while the porous outer layer, composed of one‐dimensional Tempo‐oxidized cellulose nanofibers (TCNF) and polyacrylic acid (PAA) macromolecule, functions akin to structural “rebar” and “concrete”, effectively preserves the tightly interconnected conductive framework though multiple bonding mechanisms, including covalent and hydrogen bonds. Additionally, Ti 3 C 2 T x enhances the development of a LiF‐enriched SEI. Consequently, the μSi‐MTCNF‐PAA anode presents a high discharge capacity of 1413.7 mAh g −1 even after 500 cycles at 1.0 C. Moreover, a full cell, integrating LiNi 0.8 Mn 0.1 Co 0.1 O 2 with μSi‐MTCNF‐PAA, exhibits a capacity retention rate of 92.0% following 50 cycles. This GHOC network structure could offer an efficacious pathway for stabilizing both the bulk‐phase and interphase structure of anode materials with high volumetric strain. This article is protected by copyright. All rights reserved
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