Effects of stress dependent electrochemical reaction on voltage hysteresis of lithium ion batteries
Effects of stress dependent electrochemical reaction on voltage hysteresis of lithium ion batteries
复制标题
应力依赖性电化学反应对锂离子电池电压迟滞的影响
DOI：
10.1007/s10483-018-2373-8
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Junqian Zhang
中科院分区：
文献类型：
--
作者：
Haoliang Li;Yicheng Song;Bo Lu;Junqian Zhang
锂离子嵌入锂离子电池电极时会受到活性材料应力的影响，导致能量耗散和应力依赖性电压滞后。建立反应-扩散-应力耦合模型来研究恒电流和恒电位操作下的应力效应。仿真发现，应力滞后会导致电压滞后并导致能量耗散。此外，应力引起的电压滞后在低速率恒电流操作中很小，但在高速率情况下异常显着。在恒电位操作中，应力和应力引起的过电势在操作开始后很快增加到峰值，并在剩余时间内衰减。因此，建议采用组合的充放电操作，即首先进行恒电流操作，然后进行恒电位操作。这种组合操作不仅可以避免操作过程中的极端应力，从而防止电极失效，而且可以减少由于应力影响而产生的电压迟滞和能量耗散。
Intercalation of lithium ions into the electrodes of lithium ion batteries is affected by the stress of active materials, leading to energy dissipation and stress dependent voltage hysteresis. A reaction-diffusion-stress coupling model is established to investigate the stress effects under galvanostatic and potentiostatic operations. It is found from simulations that the stress hysteresis contributes to the voltage hysteresis and leads to the energy dissipation. In addition, the stress induced voltage hysteresis is small in low rate galvanostatic operations but extraordinarily significant in high rate cases. In potentiostatic operations, the stresses and stress induced overpotentials increase to a peak value very soon after the operation commences and decays all the left time. Therefore, a combined charge-discharge operation is suggested, i.e., first the galvanostatic one and then the potentiostatic one. This combined operation can not only avoid the extreme stress during operations so as to prevent electrodes from failure but also reduce the voltage hysteresis and energy dissipation due to stress effects.