文章信息/Info

Title:

The Atomic-scale Characterization of Structure and Interface of Electrode Materials of Lithium-ion Batteries

作者:

仝毓昕; 張慶華; 谷林

中國科學院物理研究所

Author(s):

TONG Yuxin;  ZHANG Qinghua;  GU Lin

Institute of Physics, Chinese Academy of Sciences

關鍵詞:

鋰離子電池電極材料; 球差校正掃描透射電子顯微鏡; 表界面原子尺度結構; 電化學反應機理; 表面相變; 相界面

Keywords:

Lithium-ion batteries;  aberration-corrected scanning transmission electron microscopy;  atomic scale surface and interface structure;  electrochemical reaction mechanism; the phase transition of surface; interface.

DOI:

10.7502/j.issn.1674-3962.2017.10.04

文獻標志碼:

A

摘要:

鋰離子電池充放電過程中，鋰離子的傳輸要穿過多種表面和界面，表界面的性質對電池的功率密度、能量密度、充放電效率、使用壽命、循環性等特性具有重要的影響。表界面一般具有與體相不同的結構，在原子尺度上直接觀察不同電化學狀態下電極表界面的結構，有助于從更深層次認識電化學反應機理和性能演化規律，對于改善鋰離子電池性能具有重要的指導意義。本文闡述了球差校正透射電子顯微成像技術在研究電極材料表界面結構原子尺度研究中的應用，介紹了特殊的相界面、SEI、表面相變、表面摻雜等，探討了表界面原子尺度結構與性能的內在關聯，提出了改善電池性能的針對性建議，并對鋰離子電池未來的發展從提高能量密度、避免固液界面副反應和改善電池性能三個方面進行了展望。

Abstract:

Lithium-ion is transferred through a variety of surfaces and interfaces in Lithium-ion batteries during the process of charging and discharging. The properties of surface and interface of electrode have great influence on the power density, energy density, the efficiency of charging and discharging, service life, cycling stability. In general, the structure of surface and interface of material are different from that of bulk, direct observation upon atomic-scale structure of electrode in different electrochemical state contributes to studying electrochemical reaction mechanism and evolution of properties and is of instructive significance to improve the properties of Lithium-ion batteries. In this paper , we review the recent progress in investigations of surface and interface structure of electrode materials, introduce special interface, SEI, the phase transition of surface and doping of surface, discuss the inherent correlation between the atomic-scale structures of surface and interface of electrode materials and their performance, raise some advises to improve the performance of Lithium-ion batteries and look forward to the development of Lithium-ion batteries in the aspect of increasing of energy density ,averting side reaction of solid electrode and liquid electrolyte and properties improvement.