高能量密度锂电池开发策略

李文俊, 徐航宇, 杨琪, 李久铭, 张振宇, 王胜彬, 彭佳悦, 张斌, 陈相雷, 张臻, 杨萌, 赵言, 耿瑶瑶, 黄文师, 丁泽鹏, 张雷, 田启友, 俞会根, 李泓

Development of strategies for high-energy-density lithium batteries

Wenjun LI, Hangyu XU, Qi YANG, Jiuming LI, Zhenyu ZHANG, Shengbin WANG, Jiayue PENG, Bin ZHANG, Xianglei CHEN, Zhen ZHANG, Meng YANG, Yan ZHAO, Yaoyao GENG, Wenshi HUANG, Zepeng DING, Lei ZHANG, Qiyou TIAN, Huigen YU, Hong LI

图28 PP/GO/Nafion三元隔膜的示意图：PP层作为独立的支撑。具有超低负载量0.0032 mg/cm2 GO薄片不仅可以覆盖PP膜的大孔，而且可以作为物理屏障选择性地抑制多硫化物阴离子，涂覆在GO层上0.05 mg/cm2 的Nafion层含有的-SO3 - 基团允许正电荷种类（Li+ ）离子跳跃但不允许Sn2- 负离子跳跃。在锂电池的循环过程中，这种三层隔膜提高了Li-S电池的库仑效率和容量保持率[99]

Fig.28 Schematic of a ternary PP/GO/Nafion separator: The PP layer serves as free-standing continuous support. GO sheets not only cover the macropores on the PP separator with an ultralow loading of 0.0032 mg/cm2, but also serve as physical barriers to selectively suppress the polysulfide anions. A Nafion layer of 0.050 mg/cm2 is coated on GO to afford–SO3 - groups that allow ion hopping of positive charge species (Li+) but reject hopping of negative ions of Sn2-. Such ternary-layered separator improves the Coulombic efficiency and capacity retention during cycling of an Li-S battery [99]