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第 7 期 徐 健，等: 氧化铝/丙烯酸酯乳液改性聚乙烯隔膜的制备及性能
覆 PE 隔膜电池的循环稳定性。前 120 次循环后 PE
隔膜与涂覆 PE 隔膜的放电比容量相似，200 次循环
后涂覆 PE 隔膜的放电比容量为 124.6 mA·h/g，容量
保持率为 90.2%，高于 PE 隔膜的 84.7%，说明在相
同条件下涂覆 PE 隔膜比 PE 隔膜具有更好的循环性
能。优异的循环稳定性是由于涂覆 PE 隔膜对电解
液有更好的浸润性和吸液能力。
图 6b 为 PE 隔膜及涂覆 PE 隔膜组装电池的倍
率性能，可以看出装配有 PE 隔膜和涂覆 PE 隔膜的
电池在 0.2 C 电流密 度下的放电 比容量均在
153.4 mAh·/g 左右，随着放电电流的增加，0.5、1、
2 C 下放电容量均急剧下降，涂覆 PE 隔膜的放电比
容量比 PE 隔膜略高。
图 6c 为 PE 隔膜及涂覆 PE 隔膜组装电池的交
流阻抗谱性能，PE 隔膜的本体电阻、界面阻抗分别
为 0.26、59.78 Ω，涂覆 PE 隔膜的本体电阻、界面
阻抗分别为 0.54、60.90 Ω，涂覆 PE 隔膜的涂覆层
具有多孔结构，延长了锂离子的传输距离，电池内
阻略有增加。
图 6d 为 PE 隔膜及涂覆 PE 隔膜组装电池的循
环伏安曲线，各循环 3 次。PE 隔膜及涂覆 PE 隔膜
组装电池均出现了一个明显的氧化峰和还原峰，分
别对应充放电过程中锂离子的脱出和嵌入，氧化、
还原峰的峰形对称，可逆性均较好。
3 结论
以 Al 2 O 3 为无机材料，丙烯酸酯乳液作为粘结
剂，水为分散介质，制备了一种水性陶瓷浆料，加
入质量分数 0.10%含氟表面活性剂可以改善浆料的
涂覆性能 ，表面张 力由 37.0 mN/m 降低 至
28.5 mN/m，与 PE 隔膜的接触角由 87.42°降低至
30.70°，涂覆一层厚度为 4 μm 陶瓷涂层的 PE 隔膜，
电解液接触角由 62.56°减小到 9.73°，吸液率由 85%
提高到 165%。150 ℃时，PE 隔膜的 MD 和 TD 的
热收缩率大于 65%，涂覆 PE 隔膜的热收缩率小于
3%，涂覆 PE 隔膜具有更好的热稳定性。200 次循
环后涂覆 PE 隔膜的容量保持率为 90.2%，高于 PE
隔膜的 84.7%。采用 Al 2 O 3 /丙烯酸酯乳液复合涂层
制备的涂覆 PE 隔膜，具有更高的吸液率、更好的
耐热稳定性以及循环、倍率性能。
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