In-situ measurements of mechanical and volume change of LiCoO 2 lithium-ion batteries during repeated charge–discharge cycling by using digital image correlation
In-situ measurements of mechanical and volume change of LiCoO 2 lithium-ion batteries during repeated charge–discharge cycling by using digital image correlation
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利用数字图像相关技术原位测量 LiCoO2 锂离子电池在重复充放电循环过程中的机械和体积变化
DOI：
10.1016/j.measurement.2016.09.023
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发表时间：
2016-12
期刊：
影响因子：
5.6
通讯作者：
X.Chen
中科院分区：
文献类型：
--
作者：
J.Luo;C.Y.Dai;Z.Wang;K.Liu;W.G.Mao;D.N.Fang;X.Chen
采用数字图像相关技术，原位测量了55次电化学充放电循环过程中袋式商用锂离子电池的位移形态演变。在55次循环中，电池表面的最大主应变达到0.35%。LIB的整体体积变化分析表明，最大体积变化率在第52个完全充电端达到4.27%，最大剩余体积变化率在第54个放电端达到2.89%。用扫描电镜观察了电化学循环前后阴极和阳极的表面形貌。通过拉伸试验，LIB中铜箔的弹性模量从接收时的16.7GPa下降到55次循环后的10.6GPa。
In-situ morphological evolution of displacement in pouch-type commercial lithium-ion batteries during multiple fifty-five electrochemical charging-discharging cycles was measured via digital image correlation technique. The maximum principal strain on the battery surface reached 0.35% during 55 cycles. The whole volume change analysis of LIBs shows that the maximum volume change rate arrives at 4.27% at the fully 52nd charging end, and the maximum residual volume change rate is about 2.89% at the 54th discharging end. The surface morphologies of cathodes and anodes before and after electrochemical cycling were observed by scanning electron microscopy. The elastic modulus of the copper foil in LIBs decrease from as-received 16.7 GPa to 10.6 GPa after 55 cycles by using tensile tests.
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