Understanding the limits of rapid charging using instrumented commercial 18650 high-energy Li-ion cells
Understanding the limits of rapid charging using instrumented commercial 18650 high-energy Li-ion cells
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DOI：
10.1016/j.electacta.2018.01.076
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发表时间：
2018-02-10
影响因子：
6.6
通讯作者：
Bhagat, Rohit
中科院分区：
文献类型：
--
作者：
Amietszajew, Tazdin;McTurk, Euan;Bhagat, Rohit
商用高能锂离子电池的充电速率受到制造商规格的限制，导致充电时间过长。然而，这些电池通常能够更快地充电，如果确保热和电极特定的电压曲线不超过安全极限的话。不幸的是，迄今为止，在不改变这些电池的操作的情况下，还没有实现这些参数的精确和原位测量。在这里，我们提出了一种方法来评估商业18650的最大电流，使用新的仪器方法，使在operando测量。我们发现，可以安全应用于评估的高能量电池的最大充电电流比电池组声明的最大值高6.7倍。随后开发了快速充电协议，该协议在不影响电池安全限制的情况下将充电时间缩短了五倍以上。我们希望我们的工作是一个起点，通过部署不同的原位传感器系统，更复杂的理解商业锂离子电池。这种理解将使电池材料科学，电池技术的热工程和电气工程的进步。此外，这项工作有可能帮助设计高性能应用的储能系统，如赛车和电网平衡。(c)2018作者由爱思唯尔有限公司发布
The charging rates of commercial high-energy Li-ion cells are limited by the manufacturer's specifications leading to lengthy charging times. However, these cells are typically capable of much faster charging, if one ensures that the thermal and electrode-specific voltage profiles do not exceed safety limits. Unfortunately, precise and in-situ measurements of these parameters have not been achieved to date without altering the operation of these cells. Here we present a method to assess the maximum current for commercial 18650s, using novel instrumentation methods enabling in operando measurements. We found the maximum charging current that could be safely applied to the evaluated high-energy cells is 6.7 times higher than the manufacturer-stated maximum. Subsequently a rapid-charging protocol was developed that leads to over five-fold reduction in charging times without compromising the safety limits of the cells. We anticipate our work to be a starting point for a more sophisticated understanding of commercial Li-ion cells through deployment of diverse in-situ sensor systems. This understanding will enable advances in battery materials science, thermal engineering and electrical engineering of battery technology. Furthermore, this work has the potential to help the design of energy storage systems for high performance applications such as motor racing and grid balancing. (c) 2018 The Authors. Published by Elsevier Ltd.