Electrolytic solvent effects on the gassing behavior in LCO parallel to LTO batteries
Electrolytic solvent effects on the gassing behavior in LCO parallel to LTO batteries
复制标题
电解溶剂对与 LTO 电池并联的 LCO 中析气行为的影响
DOI：
10.1016/j.electacta.2018.04.113
复制
发表时间：
2018
影响因子：
6.6
通讯作者：
Miller Theodore
中科院分区：
文献类型：
--
作者：
Zhang Lan;Zhang Suojiang;Zhou Qian;Snyder Kent;Miller Theodore
Li 4 Ti 5 O 12（LTO）具有上级倍率性能和超长的循环寿命，在电动汽车和固定式储能领域具有广阔的应用前景。然而，其广泛的汽车应用受到高温（55 °C或更高）暴露期间电解质分解和析气问题的阻碍。这种气体生成的确切机制仍然没有被广泛理解，并且尚未报道针对该问题的具体的普遍接受的解决方案。在这项研究中，LiCoO 2/Li 4 Ti 5 O 12全电池由三种不同的电解质组成，并在不同的电位范围（1.5-2.8 V，1.5-2.9 V和1.5-3.0 V）在室温或60 °C下充电/放电。我们发现，电解质组分，特别是相对于环状碳酸酯的含量，表现出显着的产气行为的影响，给电子基团有助于气体抑制。同时，测试温度和截止电压（UCOV）也影响析气行为。例如，当在60 °C或更低温度下用合适的电解质和低于2.9V的UCOV测试电池时，观察到非常有限的析气现象，而当UCOV增加到3.0V或更高时产生气体。
Li4Ti5O12(LTO) is a promising anode material in both electrified vehicle and stationary energy storage applications for its superior rate capability and ultra-long cycle life. However, its widespread automotive utilization is hindered by electrolyte decomposition and gassing issues during high temperature (55 °C or higher) exposure. The exact mechanism of this gas generation is still not widely understood, and a specific commonly accepted solution for this issue has not yet been reported. In this study, LiCoO2/Li4Ti5O12full cells are fabricated with three different electrolyte compositions and charged/discharged over different potential ranges (1.5–2.8 V, 1.5–2.9 V and 1.5–3.0 V) in room temperature or 60 °C. We find that the electrolyte component, in particular with respect to the cyclic carbonate content, exhibits significant influence on the gassing behavior; electron donating groups are helpful in gas suppression. Meanwhile, test temperature and up cut off voltage (UCOV) also influence the gassing behavior. For example, very limited gassing phenomenon is observed when the battery is tested at 60 °C or lower temperature with suitable electrolyte and UCOV below 2.9 V, while gas is produced when the UCOV is increased to 3.0 V or higher.