Adverse Effects of Trace Non-polar Binder on Ion Transport in Free-standing Sulfide Solid Electrolyte Separators
Adverse Effects of Trace Non-polar Binder on Ion Transport in Free-standing Sulfide Solid Electrolyte Separators
复制标题
痕量非极性粘合剂对独立式硫化物固体电解质分离器中离子传输的不利影响
DOI：
10.1149/1945-7111/aced24
复制
发表时间：
2023
影响因子：
3.9
通讯作者：
Nanda, Jagjit
中科院分区：
文献类型：
--
作者：
Mills, Anna;Yang, Guang;Tsai, Wan-Yu;Chen, X. Chelsea;Sacci, Robert L.;Armstrong, Beth L.;Hallinan, Daniel T.;Nanda, Jagjit
硫化物固体电解质（SE）具有很高的室温离子电导率。然而，使全固态电池能够提供高能量和功率密度的独立式、片状薄硫化物SE膜电解质的制造仍然具有挑战性。本文中，我们表明，硫银矿（Li 6 PS 5 Cl）SE可以浆料流延形成低（≤ 5重量%）的聚（异丁烯）（PIB）粘合剂负载的自支撑膜。两个因素促成了以原始粉末粒料SSE对应物为基准的薄膜SE的较低的面积比电阻（ASR）：i）1-2个数量级的减小的厚度和ii）在等静压工艺之后在室温下相当的离子电导率。然而，增加聚合物粘合剂负载不可避免地在薄膜SE中引入空隙，损害阳极/电解质界面离子传输。我们的研究结果强调，电解质/电极界面的稳定性，以及选择的浆料成分，包括硫化物SE，粘合剂，和溶剂，薄膜硫化物电解质的发展中起着至关重要的作用。
Sulfide solid-state electrolyte (SE) possesses high room-temperature ionic conductivity. However, fabrication of the free-standing, sheet-type thin sulfide SE film electrolyte to enable all-solid-state batteries to deliver high energy and power density remains challenging. Herein we show that argyrodite sulfide (Li 6 PS 5 Cl) SE can be slurry cast to form free-standing films with low (≤ 5 wt%) loadings of poly (isobutylene)(PIB) binder. Two factors contribute to a lower areal specific resistance (ASR) of the thin film SEs benchmarked to the pristine powder pellet SSE counterparts: i) 1–2 orders reduced thickness and ii) reasonably comparable ionic conductivity at room temperature after the isostatic pressing process. Nevertheless, an increasing polymer binder loading inevitably introduced voids in the thin film SEs, compromising anode/electrolyte interfacial ion transport. Our findings highlight that electrolyte/electrode interfacial stability, as well as the selection of slurry components, including sulfide SE, binder, and solvent, play essential roles in thin film sulfide electrolyte development.