共 50 条
In Situ and Operando Investigations of Failure Mechanisms of the Solid Electrolyte Interphase on Silicon Electrodes
被引:140
作者:
Kumar, Ravi
[1
]
Tokranov, Anton
[1
]
Sheldon, Brian W.
[1
]
Xiao, Xingcheng
[2
]
Huang, Zhuangqun
[3
]
Li, Chunzeng
[3
]
Mueller, Thomas
[3
]
机构:
[1] Brown Univ, Sch Engn, 182 Hope St,Box D, Providence, RI 02912 USA
[2] Gen Motors Global R&D Ctr, 30500 Mound Rd, Warren, MI 48090 USA
[3] Bruker Nano Surfaces, 112 Robin Hill Rd, Goleta, CA 93117 USA
关键词:
LITHIUM-ION BATTERIES;
ATOMIC-FORCE MICROSCOPY;
COMPOSITE GRAPHITE-ELECTRODES;
THIN-FILM ELECTRODES;
SEI FORMATION;
X-RAY;
LI;
ANODES;
LITHIATION;
EVOLUTION;
D O I:
10.1021/acsenergylett.6b00284
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
The lifetime of rechargeable lithium ion batteries is closely related to the formation and evolution of the solid electrolyte interphase (SEI). These passivation films undergo substantial deformations when the underlying electrode particles expand and contract during cycling. Directly probing these changes is extremely challenging. In this study, we demonstrate a new approach for applying controlled strains to SEI films with patterned Si electrodes, in conjunction with direct observations of mechanical degradation using in operando atomic force microscopy. Monitoring both strain and crack formation in SEI provides new in-depth understanding of SEI fracture. These results verify that crack formation occurs during lithiation (this has been predicted previously but not directly observed). Additional SEI formation at low potentials did not fill these cracks, which directly contradicts prior speculation. These experiments also made it possible to estimate the fracture toughness of the SEI (a key value that has not been previously measured).
引用
收藏
页码:689 / 697
页数:9
相关论文
共 50 条