Cobalt dissolution in LiCoO2-based non-aqueous rechargeable batteries
Cobalt dissolution in LiCoO2-based non-aqueous rechargeable batteries
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DOI：
10.1016/0167-2738(95)00231-6
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发表时间：
1996-01-01
影响因子：
3.2
通讯作者：
Klein, LC
中科院分区：
文献类型：
--
作者：
Amatucci, GG;Tarascon, JM;Klein, LC
将使用各种不同制备的LiCoO2样品的可再充电锂电池循环至相对于Li的4.5V，并在电池循环超过25次后研究负电极的Co沉积物。定性分析揭示了样品的钴溶解的证据，显示随着循环次数的增加容量损失很大。建立了容量损失百分比和钴损失百分比之间的直接相关性。循环LiCoO2基电池的电压范围从4.1到4.5被发现导致在大于4.2 V的电压的容量衰减的增加，与传统的限制的可逆性的4.2 V的LiCoO2一致。对于大于4.2 V的电压，容量衰减与测得的钴溶解量成比例，这被发现与通过原位X射线衍射观察到的结构变化相关。
Rechargeable lithium batteries using a variety of differently prepared LiCoO2 samples were cycled to 4.5 V versus Li and the negative electrode was investigated for Co deposits after the cell was cycled over 25 times. Qualitative analysis revealed evidence of cobalt dissolution for samples showing high capacity loss with cycle number. A direct correlation between the percentage capacity loss and percentage cobalt loss was established. Cycling LiCoO2-based cells to voltages ranging from 4.1 to 4.5 was found to result in an increase in the capacity fade for voltages greater than 4.2 V, consistent with the traditional limit of reversibility of 4.2 V for LiCoO2. For voltages greater than 4.2 V, the capacity fading scaled with the measured amount of cobalt dissolution which was found to correlate with structural changes observed by in-situ X-ray diffraction.