阳极
材料科学
法拉第效率
电解质
相对湿度
化学工程
复合材料
复合数
锂(药物)
容量损失
电极
化学
物理
工程类
热力学
内分泌学
物理化学
医学
作者
Jie Zhao,Hyun‐Wook Lee,Jie Sun,Kai Yan,Yayuan Liu,Wei Liu,Zhenda Lu,Dingchang Lin,Guangmin Zhou,Yi Cui
标识
DOI:10.1073/pnas.1603810113
摘要
A common issue plaguing battery anodes is the large consumption of lithium in the initial cycle as a result of the formation of a solid electrolyte interphase followed by gradual loss in subsequent cycles. It presents a need for prelithiation to compensate for the loss. However, anode prelithiation faces the challenge of high chemical reactivity because of the low anode potential. Previous efforts have produced prelithiated Si nanoparticles with dry air stability, which cannot be stabilized under ambient air. Here, we developed a one-pot metallurgical process to synthesize LixSi/Li2O composites by using low-cost SiO or SiO2 as the starting material. The resulting composites consist of homogeneously dispersed LixSi nanodomains embedded in a highly crystalline Li2O matrix, providing the composite excellent stability even in ambient air with 40% relative humidity. The composites are readily mixed with various anode materials to achieve high first cycle Coulombic efficiency (CE) of >100% or serve as an excellent anode material by itself with stable cyclability and consistently high CEs (99.81% at the seventh cycle and ∼99.87% for subsequent cycles). Therefore, LixSi/Li2O composites achieved balanced reactivity and stability, promising a significant boost to lithium ion batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI