ELECTROCHEMICAL CHARACTERISTICS OF POLYMERIZED C60 FILM AS ARTIFICIAL SOLID-ELECTROLYTE INTERFACE ON THE SURFACE OF ELECTRODE FOR LITHIUM ION BATTERIES
- ELECTROCHEMICAL CHARACTERISTICS OF POLYMERIZED C60 FILM AS ARTIFICIAL SOLID-ELECTROLYTE INTERFACE ON THE SURFACE OF ELECTRODE FOR LITHIUM ION BATTERIES
- 이중기; 김정섭; Arenst Andres Arie
- Issue Date
- 2011 MRS Fall meeting
- Batteries are energy storage devices that convert chemical energy in a fixed volume to direct-current electrical energy. The anode and cathode materials of lithium ion secondary batteries serve as hosts for lithium and the lithium intercalation sites in the anode and cathode have different chemical potentials. Basically, the discharge reactions of lithium batteries involve the generation of lithium ions and their migration across the electrolyte and insertion into the crystal lattice of the host electrode materials. In the case of a charge reaction, the ions move in the opposite direction to that of the discharge reaction. Therefore, in order to optimize the design of the electrode materials in the battery system, we should consider the electrode materials from the point of view of the circulation of the ions. This transport process is a key factor in the operation of non aqueous batteries.
Hence, the importance of the Solid-Electrolyte Interface (SEI) is well recognized because the migration of ions through the interface is the rate determining step. The solvated lithium ions in the electrolyte lose their salvation shell while penetrating the SEI and are incorporated into the host structure in a solvent free form. Such reactions are desirable, but in some cases lithium intercalates together with the solvated shell, causing the exfoliation of the electrode. This phenomenon leads to the mechanical breakdown of the electrode due to the stress in the SEI caused by the local preferential dissolution of the electrode material. The SEI determines the safety, power capability, morphology of lithium deposits, shelf life and cycle life of the battery. The formation of the SEI involves diverse routes such as the precipitation of insoluble Li2Co3, salt ions and polymerized solvent.
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