阳极
法拉第效率
电化学
硅
电池(电)
锂(药物)
锂离子电池
材料科学
离子
色散(光学)
体积热力学
电导率
离子电导率
化学工程
纳米技术
光电子学
工程类
化学
电极
电解质
物理
有机化学
功率(物理)
物理化学
热力学
内分泌学
医学
光学
作者
Hyun-Jung Park,Seungmin Han,Hyeon-Seok Tak,Junghwan Kim,Kwang Chul Roh,Dae Soo Jung,Taeseup Song,Patrick Joohyun Kim,Jung‐Hyun Choi
标识
DOI:10.1016/j.jpowsour.2023.233159
摘要
Rechargeable lithium-ion batteries with high energy density have attracted attention as a means of solving environmental problems. Silicon (Si) has been considered as one of the most promising anode materials due to its high theoretical capacity of 3579 mAh g−1 (Li15Si4). However, the enormous volume change of Si occurs during lithiation/delithiation process, which seriously deteriorates the mechanical/electrochemical stability of Si anodes. To address these inherent problems, it is of importance to develop a functional binder capable of reducing the volume variation of Si anodes. In this work, we first design a new binder system by employing a Multifunctional Network Binder (MNB) to synergistically improve the electrochemical stability and performances of Si-based electrodes. The introduction of MNB into the Li-PAA-based electrode system constructs a strong binding matrix through abundant functional bridges. In addition, the MNB with high dispersion stability improves the ionic conductivity of Si-based electrodes. Owing to these synergistic effects of Li-PAA/MNB binder system, the volume expansion of Si-based electrodes was significantly suppressed, contributing to the excellent Coulombic efficiency (99.9%) and capacity retention (87% after 100 cycles).
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