A Regular Biporous Model of the Cathode Active Layer Structure of a Lithium-Oxygen Battery. Calculation of Overall Chara
- PDF / 752,844 Bytes
- 9 Pages / 612 x 792 pts (letter) Page_size
- 91 Downloads / 158 Views
ICOCHEMICAL PROCESSES AT THE INTERFACES
A Regular Biporous Model of the Cathode Active Layer Structure of a Lithium-Oxygen Battery. Calculation of Overall Characteristics of the Cathode Active Layer Yu. G. Chirkova, *, V. I. Rostokinb, **, V. N. Andreeva, ***, V. A. Bogdanovskayaa, ****, and O. V. Korchagina, ***** aFrumkin
Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071 Russia b National Research Nuclear University Moscow Energy Physics Institute, Moscow, 115409 Russia *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] ****e-mail: [email protected] *****e-mail: [email protected] Received March 13, 2019; revised September 27, 2019; accepted October 3, 2019
Abstract—The active layer of a lithium-oxygen battery (LOB) cathode must have a complex structure consisting of two types of pores (macropores and mesopores). For successful operation of the cathode active layer during the LOB discharge, attempts are being made to create two types of pore clusters: a macropore cluster that provides the transport of oxygen to a zone, where the final product, lithium peroxide, is formed, and a mesopore cluster that guarantees the delivery of lithium ions. The structure of the cathode active layer composed of two types of clusters is optimized in model calculations. However, it from the experimental data, even after the actual implementation of these theoretical recommendations, that the LOB dimensional characteristics during the discharge (in particular, current density I, mA/cm2, and cathodic capacitance C, C/cm2) remain low. In the present work, a new type of cathode active layer structure was suggested: a regular biporous model. In this model, the channels for the supply with oxygen and lithium ions are separated from each other. This fact allows one to simultaneously and independently improve the operation of each of the two channels. The calculations showed a clear advantage of the active layers with this new structure. In particular, the current density i and cathode capacitance С raised to tens of mA/cm2 and about of a thousand of C/cm2. Keywords: lithium-oxygen battery, discharge process, cathode active layer, regular biporous model, computer simulation, constant of oxygen flow k DOI: 10.1134/S2070205120030119
a complex reaction occurring in the process of oxygen reduction [5, 6]:
STATEMENT OF THE PROBLEM Lithium-oxygen batteries (LOBs) may become one of the most promising technologies for generating and storing electricity due to their ultrahigh energy density. The interest in LOBs intensified after publication [1], in which aqueous electrolyte was proposed as a substitute for a nonaqueous electrolyte. It is projected that the specific LOB energy will be approximately an order of magnitude higher than the characteristics of the widely used lithium-ion batteries [2]. A characteristic feature of the discharge process of a LOB cathode with nonaqueous electrolyte is a pore blockage in a positive electrode by a substance that
Data Loading...
