石墨
材料科学
兴奋剂
套管
位阻效应
电极
泄流深度
比能量
阴极
化学工程
复合材料
储能
阳极
纳米技术
光电子学
热力学
化学
机械工程
物理化学
有机化学
工程类
功率(物理)
物理
作者
Yvan Reynier,Christophe Vincens,Côme Leys,Benjamin Amestoy,Eric Mayousse,Benoit Chavillon,Lionel Blanc,Elise Gutel,Willy Porcher,Takakazu Hirose,Chinami Matsui
标识
DOI:10.1016/j.jpowsour.2020.227699
摘要
SiO is a promising negative electrode material to increase Li-ion batteries specific energy thanks to its high capacity and stability. However it needs to be blended in low amounts with graphite because of its poor first cycle efficiency. Here we implement new Li doped carbon coated SiO material that overcomes this limitation and enables higher energy density cells. Reference SiO grade is compared to pre-lithiated materials and SiO content up to 20% blend with graphite are evaluated in pouch and 21700 cells with more than 500 cycles obtained at 90% depth of discharge. Reaction mechanism is proposed for standard as well as pre-lithiated SiO, and generalized for SiOx. Finally we discuss behavior in hard casing full cell using this simple model to calculate volume expansion. We show with steric consideration that 40% SiO is likely the ultimate ratio practically useable in cylindrical cells.
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