Open AccessRationally designed high‐conductivity Hydrangea macrophylla ‐like Si@NiO@Ni/C composites as a high‐performance anode material for lithium‐ion batteries
Author(s) -
Yu Kunxiang,
Liu Junhao,
Gong Xuzhong,
Zhang Xianren,
Wang Zhi
Publication year - 2022
Publication title -
electrochemical science advances
Language(s) - English
Resource type - Journals
ISSN - 2698-5977
DOI - 10.1002/elsa.202100169
Subject(s) - materials science , anode , lithium (medication) , substrate (aquarium) , non blocking i/o , conductivity , calcination , electrolyte , composite material , chemical engineering , electrode , chemistry , medicine , biochemistry , oceanography , geology , engineering , endocrinology , catalysis
Reasonable design of the core‐shell structure with a high conductive stable substrate is an effective way to solve the huge volume expansion and low intrinsic conductivity of Si‐based anode materials in Li‐ion batteries (LIBs). In this work, the Hydrangea macrophylla ‐like composites (Si@NiO@Ni/C) have been successfully synthesized by staged calcination of the Si@Ni(OH) 2 @C precursor. This design achieved a stable loading of Si nanoparticles on the high conductive substrate by forming chemical bonds and provided enough space for the expansion of Si. Furthermore, the existence of a hybrid coating layer could stabilize the formation of the solid electrolyte layer and accelerate the migration of Li + and electrons, which greatly improved the kinetics performance on the electrode surface. As a consequence, the design showed excellent cycle stability (1265.5 mAh g –1 after 300 cycles at 0.5 A/g) and rate performance (982.2, 876.1, 766.6, 645.8, 572 mAh/g at 0.2, 0.5, 1, 2, 3 A/g, respectively), providing a simple and controllable method to synthesize Si‐based anode materials for high‐performance LIBs.