A study of lithium ion intercalation induced fracture of silicon particles used as anode material in Li-ion battery
A study of lithium ion intercalation induced fracture of silicon particles used as anode material in Li-ion battery
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DOI：
10.1016/j.jpowsour.2011.05.049
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发表时间：
2011-10-01
影响因子：
9.2
通讯作者：
Daniel, C.
中科院分区：
文献类型：
--
作者：
Kalnaus, S.;Rhodes, K.;Daniel, C.
利用热模拟模型和脆性断裂损伤参数描述了锂离子嵌入硅颗粒时由于内应力而导致的断裂。根据扩散方程和具有适当体积膨胀项的弹性方程计算应力。并与硅电极锂离子半电池电化学循环实验的声发射数据进行了比较。实验和预测之间有很好的相关性。不同粒径的计算结果表明，存在一个临界尺寸，低于该临界尺寸时，预期不会发生破裂。这种临界尺寸似乎在微米尺度内。(C)2011 Elsevier B.V.保留所有权利。
The fracture of Si particles due to internal stresses formed during the intercalation of lithium ions was described by means of a thermal analogy model and brittle fracture damage parameter. The stresses were calculated following the diffusion equation and equations of elasticity with an appropriate volumetric expansion term. The results were compared with the acoustic emission data from the experiments on electrochemical cycling of Li ion half-cells with silicon electrodes. A good correlation between experiment and prediction was observed. The results of computations with different particle sizes show the existence of a critical size below which fracture during the titillation is not expected to occur. Such a critical size appears to be within micrometer scale. (C) 2011 Elsevier B.V. All rights reserved.