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Influence of electrolyte constitution on metal dissolution and surface free energy correlation

Influence of electrolyte constitution on metal dissolution and surface free energy correlation
Translated Title
금속 용출에 관한 전해액 구성에 대한 영향과 표면자유에너지와의 관계
Choi, Sung Mo
DGIST Authors
Choi, Sung Mo; Lee, Ho ChunKim, Jae Hyeon
Lee, Ho Chun
Kim, Jae Hyeon
Issue Date
Available Date
Degree Date
2015. 2
One of promising cathode for lithium ion battery is LiMn2O4 (LMO) due to its low cost and environmental inertness. However, LMO suffers from Mn dissolution followed by cell degradation. Mn-dissolution is heavily affected by electrode surface and electrolyte, so it is electrode/electrolyte interfacial phenomenon. However, more methodical research about the relationship between the electrolyte property and Mn-dissolution has not been carried out so far. This study examine the dependence of the Mn-dissolution on electrolyte constitution at various temperature and its kinetics. The Mn2+ ion concentration in the electrolyte at vari-ous temperature storage was analyzed by using atomic absorption spectroscopy (AAS). It was revealed that increasing EC content, storage duration and elevated temperature acceler-ates Mn-dissolution. It is diffusion controlled through the product layer. When increasing EC content, it diminish the activation energy of dissolution on electrode/electrolyte interface. ⓒ 2015 DGIST
Table Of Contents
Ⅰ. Surface free energy measurement to assess metal dissolution behavior of layered oxide LiNi0.6Co0.2Mn0.2O 2 -- 1.1 Introduction 1 -- 1.1.1 Overview 1 -- 1.1.2 Theory of surface free energy calculation 2 -- 1.1.3 Capillary rising method for porous materials 8 -- 1.1.4 Examples of surface free energy usages to analyze the Li ion batteries 10 -- 1.2 Experimental 11 -- 1.2.1 Adsorption method 11 -- 1.2.2 Preparation of NCM electrode 14 -- 1.2.3 Metal dissolution 15 -- 1.3 Results and discussion 16 -- 1.3.1 Metal dissolution and SFE of Al coated LiNi0.6Co0.2Mn0.2O2 16 -- 1.3.2 Analysis of the morphology of Al coated LiNi0.6Co0.2Mn0.2O2 19 -- 1.3.3 Connection between SFE and metal dissolution of Al coated LiNi0.6Co0.2Mn0.2O2 20 -- 1.4 Conclusions 24 -- Ⅱ. Influence of the electrolyte constitution on the dissolution kinetics of manganese from LiMn2O4 cathode for lithium ion battery -- 2.1 Introduction 25 -- 2.2 Experimental 27 -- 2.3 Results and discussion 29 -- 2.3.1 Effects of EC content, reaction temperature and storage time on Mn dissolution 29 -- 2.3.2 Kinetics of Mn dissolution 31 -- 2.3.3 Chemical reaction controlled 33 -- 2.3.4 Diffusion controlled through the product layer 36 -- 2.3.5 Activation energy determination 39 -- 2.3.6 Effect of solvation energy and HF 41 -- 2.4 Conclusions 44 -- Ⅲ. Analysis of surface free energy in battery electrolytes. -- 3.1 Introduction 45 -- 3.2 Experimental 46 -- 3.3 Results and discussion 48 -- 3.3.1 Characterization of reference materials 48 -- 3.3.2 The surface free energy calculation of propylene carbonate 51 -- 3.4 Conclusions 53
Energy Systems Engineering
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Department of Energy Science and EngineeringThesesMaster

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