Suppressing of Irreversible Capacity in Lithium-ion Batteries

článek v časopise ve Scopus, Jsc

angličtina

In this research are considered methods, which can lead to enhance capacity of Lithium-ion batteries. The majority of Li-ion batteries which are used in this time has negative electrode make from graphite. On interface between electrolyte and graphite electrode originates the SEI layer (Solid-Electrolyte Interphase), this layer is the cause of irreversible capacity of graphite. This layer is indispensable for appropriate battery function but for creating this layer is consumed almost one-third potential capacity of Li-ion cell. Is already good known that an irreversible capacity of graphite reduces total potential capacity of battery approximately from 15 % to 45 %. Our goal is to reduce capacity losses and thus increase overall capacity o lithium-ion battery. Was designed a concept in which n-butyllithium (C4H9Li) reagent behaves as the source of lithium atoms and graphite acts like acceptor of lithium atoms. Our conception presents n-butyllithium like reduction reagent which is able to reduce graphite material by Li atoms. Lithium atoms are intercalated between graphite sheets (as at charging process), resulting of this process is new lithiated electrode material which can be used for prepare of negative electrode for Li-ion cells.

Lithium, graphite, irreversible capacity, lithiation

LIBICH, J.; VONDRÁK, J.; SEDLAŘÍKOVÁ, M.; MÁCA, J.; FRK, M.

2014

11. 3. 2014

Portugaliae Electrochimica Acta

Portugal

1647-1571

Portugaliae Electrochimica Acta

31

6

Portugalská republika

297

306

10