Origin of Capacity Increasing in a Long-Life Ternary Sn-Fe3O4@Graphite Anode for Li-Ion Batteries
Origin of Capacity Increasing in a Long-Life Ternary Sn-Fe3O4@Graphite Anode for Li-Ion Batteries
复制标题
锂离子电池长寿命三元 Sn-Fe3O4@石墨负极增容的根源
DOI：
10.1002/admi.201700113
复制
发表时间：
2017-06-23
影响因子：
5.4
通讯作者：
Zhu, Min
中科院分区：
文献类型：
--
作者：
Zhang, Hanyin;Hu, Renzong;Zhu, Min
电极-电解质界面对锂离子电池的能量密度和安全性起着至关重要的作用。界面演化引起了许多金属氧化物阳极的容量增加，引起了人们的广泛关注。在这里，我们的长寿命Sn-Fe3O4@graphite复合阳极验证了容量增加的来源。通过电化学曲线、库仑效率和界面/表面化学分析可知，容量的增加来自于生长的固体电解质界面相（SEI）的形成和溶解。溶解过程只发生在一定的高电位下，在足够的纳米级金属粒子的作用下，具有高电催化作用。SEI的形成/溶解是部分可逆的，促进了SEI组分的转化。这种转化导致锂离子的不可逆消耗，但也有利于电池系统中复合阳极的动力学。
The electrode-electrolyte interface plays a key role in the energy density and safety of the Li-ion battery. The interfaces evolution induces the capacity increasing in many metal oxide anodes and attracts much attention. Here, the origin of the capacity increasing is verified by our long-life Sn-Fe3O4@graphite composite anode. By analyzing the electrochemical curves, the Coulombic efficiency and interface/surface chemistry, the capacity increasing comes from the formation and dissolution of growing solid electrolyte interphase (SEI). The dissolution process only happens in certain high potential and under the effect of the sufficient nanosized metal particles with high electrocatalysis. The formation/dissolution of SEI is partial reversible to promote the conversion of the components in SEI. This conversion causes the Li+ irreversible consuming, but also favors the kinetics of the composite anode in the battery system.