Measurement of three-dimensional microstructure in a LiCoO2 positive electrode

被引:196
作者
Wilson, James R. [1 ]
Cronin, J. Scott [1 ]
Barnett, Scott A. [1 ]
Harris, Stephen J. [2 ]
机构
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Gen Motors R&D Ctr, Warren, MI 48090 USA
基金
美国国家科学基金会;
关键词
Lithium-ion batteries; Three-dimensional (3D) microstructure; Focused ion beam (FIB) tomography; LiCoO2; Electrodes; GRAPHITE ANODE; ION BATTERY; LI; PERFORMANCE; INTERCALATION; RECONSTRUCTION; COMPRESSION; DISCHARGE; STRESS; MODEL;
D O I
10.1016/j.jpowsour.2010.04.066
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
In this work we elucidate the 3D microstructure of the LiCoO2 phase in a fresh commercial Li-ion battery positive electrode using a focused ion beam-scanning electron microscope. The particles have a highly irregular shape that includes significant internal cracking. These cracks provide a higher surface area for Li charge transfer, and they provide alternate pathways for Li transport within particles. In addition, the cracks would substantially alter the stress distributions within particles during Li-insertion and make the particles more susceptible to fracture. The particles were typically made up of multiple grains whose boundaries may also affect intraparticle Li-ion transport and fracture strength. While the particles do contact each other, the cross-sectional area of contact is quite small, emphasizing the importance of binder and conductive carbon for providing structural integrity to the electrode. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:3443 / 3447
页数:5
相关论文
共 35 条
[1]   Review of selected electrode-solution interactions which determine the performance of Li and Li ion batteries [J].
Aurbach, D .
JOURNAL OF POWER SOURCES, 2000, 89 (02) :206-218
[2]   Review on electrode-electrolyte solution interactions, related to cathode materials for Li-ion batteries [J].
Aurbach, Doron ;
Markovsky, Boris ;
Salitra, Gregory ;
Markevich, Elena ;
Talyossef, Yossi ;
Koltypin, Maxim ;
Nazar, Linda ;
Ellis, Brian ;
Kovacheva, Daniella .
JOURNAL OF POWER SOURCES, 2007, 165 (02) :491-499
[3]   The influence of surface mechanics on diffusion induced stresses within spherical nanoparticles [J].
Cheng, Yang-Tse ;
Verbrugge, Mark W. .
JOURNAL OF APPLIED PHYSICS, 2008, 104 (08)
[4]   A mathematical model of stress generation and fracture in lithium manganese oxide [J].
Christensen, J ;
Newman, J .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2006, 153 (06) :A1019-A1030
[5]   Lithium deintercalation in LiFePO4 nanoparticles via a domino-cascade model [J].
Delmas, C. ;
Maccario, M. ;
Croguennec, L. ;
Le Cras, F. ;
Weill, F. .
NATURE MATERIALS, 2008, 7 (08) :665-671
[6]   MODELING OF GALVANOSTATIC CHARGE AND DISCHARGE OF THE LITHIUM POLYMER INSERTION CELL [J].
DOYLE, M ;
FULLER, TF ;
NEWMAN, J .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1993, 140 (06) :1526-1533
[7]   TEM study of fracturing in spherical and plate-like LiFePO4 particles [J].
Gabrisch, H. ;
Wilcox, J. ;
Doeff, M. M. .
ELECTROCHEMICAL AND SOLID STATE LETTERS, 2008, 11 (03) :A25-A29
[8]   Three-dimensional reconstruction of porous LSCF cathodes [J].
Gostovic, D. ;
Smith, J. R. ;
Kundinger, D. P. ;
Jones, K. S. ;
Wachsman, E. D. .
ELECTROCHEMICAL AND SOLID STATE LETTERS, 2007, 10 (12) :B214-B217
[9]  
HARRIS SJ, J MAT RES IN PRESS
[10]   Performance of LiNiCoO2 materials for advanced lithium-ion batteries [J].
Itou, Y ;
Ukyo, Y .
JOURNAL OF POWER SOURCES, 2005, 146 (1-2) :39-44