高镍三元正极材料锂离子电池的热失控分析

Analysis of high nickel ternary cathode materials on thermal runaway of Li-ion battery

研究使用3种高镍三元正极材料[Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)(NCM811)、Li(Ni_(0.5)Co_(0.2)Mn 0.3)O_(2)(NCM523)和Li(Ni_(0.8)Co_(0.1)5 Al_(0.5))O_(2)(NCA)]的锂离子电池在100%荷电状态(SOC)状态下的热失控特征参数。进行3组重复性实验,对比自产热起始温度θ_(1)、热失控触发温度θ_(2)、热失控最高温度θ_(3)及相同温度点的升温速率。NCM811和NCM523电池的平均θ_(1)比NCA电池(82.15℃)分别高18.78℃和12.19℃,NCM523和NCA电池的平均θ_(2)比NCM811电池(148.75℃)分别高11.42℃和3.08℃,NCM811和NCA电池的平均θ_(3)比NCM523电池(560.18℃)分别高84.80℃和74.82℃,NCM811和NCA电池的最大升温速率平均值比NCM523电池(387.27℃/min)分别高176.13℃/min和143.85℃/min。NCM523电池的热安全性最高,NCM811电池和NCA电池的热安全性相近。

The thermal runaway characteristic parameters of Li-ion battery with three kinds of high nickel ternary cathode materials[Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)(NCM811),Li(Ni_(0.5)Co_(0.2)Mn 0.3)O_(2)(NCM523)and Li(Ni_(0.8)Co_(0.1)5 Al_(0.5))O_(2)(NCA)]in 100%state of charge(SOC)were studied.Three sets of repetitive tests were carried out.The start temperature of exothermic reactions(θ1),onset temperature of thermal runaway(θ_(2)),maximum exothermic temperature(θ_(3))and temperature rise rate at the same temperature point were compared.The averageθ_(1) of NCM811 and NCM523 battery were 18.78℃and 12.19℃higher than NCA battery(82.15℃),respectively.The averageθ_(2) of NCM523 and NCA battery were 11.42℃and 3.08℃higher than NCM811 battery(148.75℃),respectively.The averageθ_(3) of NCM811 and NCA battery were_(8)4.80℃and 74.82℃higher than NCM523 battery(560.18℃),respectively.The average maximum temperature rise rate of NCM811 and NCA battery were 176.13℃/min and 143.85℃/min higher than NCM523 battery(387.27℃/min),respectively.The thermal safety of NCM523 battery was the highest,the thermal safety of NCM811 battery and NCA battery were similar.