Memory effect in a lithium-ion battery
Memory effect in a lithium-ion battery
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DOI：
10.1038/nmat3623
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发表时间：
2013-06-01
期刊：
影响因子：
41.2
通讯作者：
Novak, Petr
中科院分区：
文献类型：
--
作者：
Sasaki, Tsuyoshi;Ukyo, Yoshio;Novak, Petr
记忆效应对于镍镉和镍氢电池的用户来说是众所周知的。如果这些电池仅部分放电后反复充电，它们会因工作电压降低而逐渐失去可用容量。相比之下，锂离子电池被认为没有记忆效应。在这里，我们报告了 LiFePO4（锂离子电池正极材料之一）的记忆效应，仅在一次部分充电和放电循环后就已经出现。我们描述了 LiFePO4 的这种记忆效应，并解释了它与逐颗粒充电/放电模型的联系。这种效应对于大多数电池用途都很重要，因为它引起的轻微电压变化可能会导致估计电池充电状态时出现严重错误计算。
Memory effects are well known to users of nickel-cadmium and nickel-metal-hydride batteries. If these batteries are recharged repeatedly after being only partially discharged, they gradually lose usable capacity owing to a reduced working voltage. Lithium-ion batteries, in contrast, are considered to have no memory effect. Here we report a memory effect in LiFePO4-one of the materials used for the positive electrode in Li-ion batteries-that appears already after only one cycle of partial charge and discharge. We characterize this memory effect of LiFePO4 and explain its connection to the particle-by-particle charge/discharge model. This effect is important for most battery uses, as the slight voltage change it causes can lead to substantial miscalculations in estimating the state of charge of batteries.