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X-ray computed tomography comparison of individual and parallel assembled commercial lithium iron phosphate batteries at end of life after high rate cycling

机译:高速循环后寿命终止时单个和并联组装的商用磷酸铁锂电池的X射线计算机断层扫描比较

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摘要

X-ray computed tomography (X-ray CT) across multiple length scales is utilized for the first time to investigate the physical abuse of high C-rate pulsed discharge on cells wired individually and in parallel.. Manufactured lithium iron phosphate cells boasting high rate capability were pulse power tested in both wiring conditions with high discharge currents of 10C for a high number of cycles (up to 1200) until end of life ( 80% of initial discharge capacity retained). The parallel assembly reached end of life more rapidly for reasons unknown prior to CT investigations. The investigation revealed evidence of overdischarge in the most degraded cell from the parallel assembly, compared to more traditional failure in the individual cell. The parallel-wired cell exhibited dissolution of copper from the anode current collector and subsequent deposition throughout the separator near the cathode of the cell. This overdischarge-induced copper deposition, notably impossible to confirm with other state of health (SOH) monitoring methods, is diagnosed using CT by rendering the interior current collector without harm or alteration to the active materials. Correlation of CT observations to the electrochemical pulse data from the parallel-wired cells reveals the risk of parallel wiring during high C-rate pulse discharge.
机译:首次使用跨多个长度尺度的X射线计算机断层扫描(X射线CT)来研究单独和并联连接的电池上高C速率脉冲放电的物理滥用。制造的高速率磷酸锂铁电池在两种布线条件下,均以10C的高放电电流进行了多次循环(最高1200次)放电试验,直到使用寿命结束(保留初始放电容量的80%以下)为止。由于CT检查之前未知的原因,并行装配更快地达到了使用寿命。调查显示,与单个电池中更传统的故障相比,并联装配中退化最严重的电池中存在过放电现象。并联电池显示出铜从阳极集电器中溶解,随后沉积在整个电池阴极附近的整个隔板中。这种过放电引起的铜沉积,特别是不可能通过其他健康状态(SOH)监测方法来确认,可以通过使用CT诊断内部集电器而不损害或改变活性材料来诊断。 CT观察结果与来自并联电池的电化学脉冲数据的相关性揭示了在高C速率脉冲放电期间并联布线的风险。

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