MoS2纳米片功能化PAN锂金属电池隔膜的制备及锂枝晶抑制作用
Fabrication of MoS2 Nanosheets Functionalized PAN Lithium Metal Battery Separator and Its Inhibition of Lithium Dendrite
董帮达 1翟云云 2刘海清 3黄振鹏 3李祖光 1李蕾3
作者信息
- 1. 浙江工业大学化学工程学院,杭州 310014
- 2. 嘉兴学院分析测试中心,嘉兴 314001
- 3. 嘉兴学院生物与化学工程学院,嘉兴市分子识别材料与传感技术重点实验室,嘉兴 314001
- 折叠
摘要
引导锂离子流的均匀分布可以有效抑制锂枝晶的形成-生长,推动锂金属电池的产业化应用.本文采用化学插层法制备出单层或少层、结构完整的MoS2纳米片,将二维MoS2纳米片喷涂到静电纺聚丙烯腈(PAN)纤维膜上,制得MoS2@PAN复合隔膜.MoS2涂层的引入不仅提高了离子电导率(1.02 mS/cm)、Li+迁移数(0.59)和电解液亲和性,而且降低了复合隔膜的孔径,使其孔径分布均一.这些特性协同作用,调控了通过MoS2@PAN复合隔膜的Li+流分布,促进了Li+在锂金属表面的均匀沉积,抑制了锂枝晶的形成-生长.因此,MoS2@PAN复合隔膜组装的Li/Li电池在1 mA/cm2电流密度下以14 mV的超低过电位可稳定循环长达500 h,循环后的锂金属表面没有明显的枝晶生长.此外,MoS2@PAN复合隔膜组装的LiFePO4/Li电池在2C倍率下循环550次后保持92%的初始容量,表现出更稳定的循环性能.通过隔膜调节Li+通量实现了锂的均匀沉积,为抑制锂枝晶的形成-生长提供了一种可行的策略.
Abstract
Guiding the uniform distribution of Li+ flux can effectively inhibit the formation and growth of lithium dendrites,promoting the industrial application of lithium metal batteries.In this study,MoS2 nanosheets with single or few layers,completed structure were prepared by chemical intercalation method,then two-dimensional MoS2 nanosheets were sprayed onto electrospun polyacrylonitrile(PAN)fiborus membrane to obtain MoS2@PAN composite separator.The introduction of MoS2 coating not only improved ion conductivity(1.02 mS/cm),Li+ transfer number(0.59),and electrolyte affinity,but also reduced the pore size of the composite membrane,resulting in a uniform pore size distribution.Synergistic effect of these characteristics regulated the Li+ flow through MoS2@PAN separator and promoted the uniform Li deposition on the surface of lithium metal,inhibiting the formation and growth of lithium dendrites.Therefore,the Li/Li symmetric cell with MoS2@PAN separator achieved a stable cycle with a low overpotential of 14 mV for 500 h at 1 mA/cm2,and there was no obvious lithium dendrite growth on the Li anode surface after cycling.Moreover,the LiFePO4/Li battery assembled with MoS2@PAN separator maintained an initial capacity of 92%after 550 cycles at 2C,demonstrating more stable cycling performance.This study redistributes the Li+ flux through a separator to achieve uniform Li deposition,providing a feasible strategy for suppressing the formation and growth of lithium dendrites.
关键词
二维材料/MoS2纳米片/锂金属电池隔膜/调节Li+通量/抑制锂枝晶形成-生长Key words
Two-dimensional material/MoS2 nanosheet/Lithium metal battery separator/Regulating Li+ flux/Suppressing the formation and growth of lithium dendrites引用本文复制引用
基金项目
浙江省自然科学基金(LGF21E030003)
浙江省自然科学基金(LTGC23B050004)
国家自然科学基金(51503079)
嘉兴市科技计划(2021AD10012)
出版年
2024
国家科技期刊平台
NSTL
万方数据