文章信息/Info

Title:

Research Advances of Inorganic Solid Electrolyte Li7La3Zr2O12

作者:

查文平; 李君陽; 陽敦杰; 沈強; 陳斐

武漢理工大學材料復合新技術國家重點實驗室

Author(s):

ZHA Wenping;  LI Junyang;  YANG Dunjie;  SHEN Qiang;  CHEN Fei

State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology

關鍵詞:

Li7La3Zr2O12; 石榴石結構; 無機固態電解質; 摻雜改性; 鋰離子電池

Keywords:

Li7La3Zr2O12;  Garnet-type;  Inorganic solid electrolyte;  Doping modification;  Lithium ion batteries

DOI:

10.7502/j.issn.1674-3962.2017.10.03

文獻標志碼:

A

摘要:

目前，采用固體電解質代替傳統電解液發展新型全固態鋰離子電池，已成為解決電池安全問題、提高電池儲能密度的一項重要的技術方法。固體電解質材料作為全固態鋰電池的核心，它的性能很大程度上決定了電池的各項性能指標。迄今被研究過的無機固體電解質材料有很多，包括NASICON型、LISICON型、鈣鈦礦型和石榴石型等晶態固體電解質和氧化物和硫化物等玻璃態固體電解質。其中石榴石型結構的Li7La3Zr2O12材料具有優異的綜合電化學性能，使其更具實際應用潛力和研究價值。實驗與理論計算表明該材料具有較高的鋰離子電導率（10-4～10-3S·cm-1），能與負極金屬鋰及大部分正極材料穩定接觸，電化學窗口高達6V。本文根據近年來國內外在該類材料上的研究現狀，主要從Li7La3Zr2O12的晶體結構特征、制備方法及摻雜改性等方面進行詳細介紹，最后闡述Li7La3Zr2O12固態電解質材料在全固態鋰電池中的發展前景及面臨的挑戰。

Abstract:

At present, replacing traditional electrolytes with solid electrolytes to develop new all-solid-state lithium ion batteries has become an important technical method to solve the battery safety problems and improve the battery energy density. As the core material of all-solid-state lithium ion batteries, the performance of the solid electrolyte largely determines the performance of the battery. So far, many inorganic solid electrolyte materials have been studied, including crystalline solid electrolyte such as NASICON-type, LISICON-type, perovskite-type and garnet-type and other glassy solid electrolyte such as oxide and sulfide. Among them, the garnet-type Li7La3Zr2O12 has excellent comprehensively electrochemical performance, which promises it a more practical application potential and more research value. Experiments and theoretical calculations show that this material has a high lithium ion conductivity (10-4 ~ 10-3S·cm-1), and can contact with the negative metal lithium and most of the cathode material in a more stable state, and its electrochemical window is as wide as 6V. In this paper, we will introduce the crystal structure, preparation method and doping modification of Li7La3Zr2O12 in detail basing on the research status at home and abroad in recent years, and then expound the development prospects and challenges of Li7La3Zr2O12 as a solid electrolyte applying in all-solid-state lithium ion batteries.