文章信息/Info

Title:

Research Progress of Composite Solid Electrolytes for All-Solid-State Lithium Batteries

文章編號:

1674-3962(2021)08-0607-11

作者:

習磊; 張德超; 劉軍

（華南理工大學材料科學與工程學院 廣東省先進能源材料重點實驗室，廣東 廣州 510641）

Author(s):

XI Lei;  ZHANG Dechao;  LIU Jun

（Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China)

關鍵詞:

全固態鋰電池; 復合固態電解質; 無機填料; 兩相界面; 滲流結構

Keywords:

all-solid-state lithium batteries;  composite solid electrolytes;  inorganic fillers;  two phase interface;  percolation structure

分類號:

TM912

DOI:

10.7502/j.issn.1674-3962.202012023

文獻標志碼:

A

摘要:

基于固態電解質和鋰金屬負極的全固態鋰離子電池能量密度高、安全性好，能夠有效地抑制鋰枝晶生長并改善電池的本征安全性。固態電解質作為全固態電池的關鍵材料，成為近年來的研究熱點。目前，通過在聚合物基體中添加無機填料得到的復合固態電解質具有優異的力學性能和電化學性能，實現了對單一固態電解質體系的“取長補短”，被視為最具前景的電解質材料。在復合固態電解質中，無機填料與聚合物基體的兩相界面對鋰電池的離子電導率有重要貢獻，但兩相界面的增加受到無機填料滲流閾值的影響。因此，從填料的形貌、排列方式等方面優化滲流結構是進一步提高離子電導率的關鍵。基于以上問題，總結了各單一類型固態電解質以及復合固態電解質的特點及其導電機理，并基于不同維度的無機填料分析了復合固態電解質研究中的滲流結構設計思路、方法優劣及性能變化，并展望了復合固態電解質未來研究重點。

Abstract:

The all-solid-state lithium batteries using solid electrolytes and metallic lithium anode exhibit high energy-density and safety, and excellent ability to inhibit the growth of lithium dendrite and improve the intrinsic safety of batteries. Solid-state electrolytes as the key material have become one of the research hotspots for the past few years. The composite solid-state electrolytes obtained by dispersing inorganic fillers in the polymer matrix are the most promising electrdytes, because of their excellent mechanical and electrochemical properties. In the composite electrolytes, the interface between ceramic fillers and polymer matrixes exhibit a huge contribution to the ionic conductivity. However, the increase of the two-phase interface has a percolation threshold with the content increase of fillers. Therefore, it is important to optimize the percolation structure, dimension and arrangement of the fillers for the further improvement of the ionic conductivity. Herein, this paper summarizes the characteristics and Li-ion conductive mechanism of several solid electrolytes and composite solid electrolytes, analyzes different research ideas of percolation structure, methods and the performance of the composite solid electrolytes based on different dimensional inorganic fillers. At last, the bottleneck of designing percolation structures with inorganic fillers and the goal of future researches are prospected.