Lithiation-induced buckling of wire-based electrodes in lithium-ion batteries: A phase-field model coupled with large deformation
Lithiation-induced buckling of wire-based electrodes in lithium-ion batteries: A phase-field model coupled with large deformation
复制标题
锂离子电池中线材电极的锂化引起的屈曲：与大变形耦合的相场模型
DOI：
10.1016/j.ijsolstr.2018.05.014
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发表时间：
2018-07
影响因子：
3.6
通讯作者：
Yang Fuqian
中科院分区：
文献类型：
--
作者：
Zhang Kai;Li Yong;Wu Jingshen;Zheng Bailin;Yang Fuqian
基于导线的电极在锂化期间可能经历屈曲，这可能导致锂离子电池的容量衰减。本工作的重点是由两相锂化反应过程中引起的线基电极的屈曲行为。提出了一种耦合大变形的Cahn-Hilliard型相场模型。提出了一个修正的临界屈曲载荷作为充电状态的函数，它可以用于分析锂化引起的线基电极的不稳定性。利用COMSOL的Multiphysics中的偏微分方程模块求解耦合方程组。数值结果表明，临界屈曲时间的屈曲开始的导线长度和电流密度的增加而减少。单相反应的情况下，也研究了两相反应的情况下进行比较。数值结果表明，对于相同的几何形状和相同的C率，两相反应和单相反应的临界屈曲时间相同，与解析分析雅阁.在这两种情况下，对金属丝端部的约束在确定临界屈曲时间方面起着重要作用，并且“更强”的约束将增加临界屈曲时间。通过数值分析确定了临界长度，并揭示了临界长度对C率和约束条件的依赖关系。导线长度对临界屈曲荷电状态（SOC）的影响与锂化机理无关，这与线弹性理论的解析解一致。纵横比越大，在屈曲开始时的相间位置越接近线材的外表面。
Wire-based electrodes can experience buckling during lithiation, which can lead to the capacity fading of lithium-ion batteries. This work is focused on the buckling behavior of wire-based electrodes induced by a two-phase lithiation reaction process. A Cahn–Hilliard type phase-field model coupled with large deformation is proposed. A modified critical buckling load is proposed as a function of the state of charge, which can be used in the analysis of lithiation-induced instability of wire-based electrodes. The coupling equations are solved by the PDE (partial differential equation) module in the Multiphysics of COMSOL. The numerical results show that the critical buckling time for the onset of buckling decreases with the increase of the wire length and current density. The single-phase reaction case is also studied to compare with the two-phase reaction case. The numerical results reveal that the critical buckling time for a wire with the two-phase reaction is the same as that with the single-phase reaction for the same geometries and the sameC-ratein accord with the analytical analysis. The constraints to the ends of a wire play an important role in determining the critical buckling time for both cases, and a “stronger” constraint will increase the critical buckling time. Numerical analysis is used to determine the critical length, above which the buckling occurs prior to the onset of phase separation, and reveal the dependence of the critical length on theC-rateand the constraint condition. The effect of the wire length on the critical buckling state of charge (SOC) is independent of the lithiation mechanism, which is consistent with the analytical solution from the theory of linear elasticity. The larger the aspect ratio, the closer is the interphase position at the onset of the buckling to the outer surface of the wire.
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核壳纳米线扩散诱发屈曲的剪切滞后模型
DOI：
10.1088/0022-3727/49/28/285602
发表时间：
2016
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
Li Yong;Zhang Kai;Zheng Bailin;Yang Fuqian
通讯作者：
Yang Fuqian
影响因子：
4.1
作者：
Ann-Christin Walk;Magalie Huttin;M. Kamlah
通讯作者：
Ann-Christin Walk;Magalie Huttin;M. Kamlah
影响因子：
3.7
作者：
T. Maxisch;Gerband Ceder
通讯作者：
T. Maxisch;Gerband Ceder
影响因子：
9.2
作者：
Fuqian Yang
通讯作者：
Fuqian Yang
影响因子：
38.3
作者：
Chan, Candace K.;Peng, Hailin;Cui, Yi
通讯作者：
Cui, Yi