Characteristics of Conducting Polymer-Coated Nanosized LiFePO4 Cathode in the Li+ Batteries

Autor:	In-Hyeong Yeo, Sun-il Mho, Hung-Cuong Dinh, Won Il Cho
Rok vydání:	2010
Předmět:	Battery (electricity) Conductive polymer Materials science chemistry.chemical_element Ionic bonding engineering.material Polypyrrole Cathode law.invention chemistry.chemical_compound Coating PEDOT:PSS chemistry Chemical engineering law engineering Lithium
Zdroj:	ECS Transactions. 28:167-175
ISSN:	1938-6737 1938-5862
Popis:	Both nano-sized and micron-sized LiFePO4 crystalline particles with rhombus structure were synthesized by a hydrothermal method for the cathode materials. Coating conductive polymers, such as polypyrrole (PPy) and poly-3,4-ethylenedioxythiophene (PEDOT), on the surfaces of LiFePO4 particles improved the battery capacities by increasing the ionic and electric conductivities of the cathode materials. The nano-sized LiFePO4 coated with PEDOT shows the largest specific capacity (167 mAhg-1 for initial to 158 mAhg-1 after 50 cycles), compared to the cases coated with PPy (165 mAhg-1 to 127 mAhg-1) and with carbon (152 mAhg-1 to 147 mAhg-1). Compared to the nano-sized particles, the micron-sized particles have much smaller surface-to-volume ratios, which resulted in increased diffusion distance requirements for lithium ions and, also, reduced accessibility of lithium ions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46f6a4ce5a378b93045b38175442eedd https://doi.org/10.1149/1.3490696 Zobrazit plný text záznamu