Abstract
In this work, the electrochemical behavior of LaMnO3 perovskite material and nanoporous carbon material in an aqueous solution of lithium sulfate are studied. The regularities of the expediency of the joint functioning of these materials as electrodes for a hybrid electrochemical capacitor are determined. It was found that the value of the specific capacity of the investigated electrochemical system of LaMnO3 / electrolyte / AC is 52 F/g during the discharge of the system to 1 V and the value of specific energy is 112.1 J /g at a discharge current of 1 mA.
Highlights
Electrochemical capacitors (EC) are one of the most promising electrical energy storage devices
ECs fill the gap between batteries and conventional capacitors, demonstrating a relatively high specific energy and power, as well as the ability to operate at a significant number of charge/discharge cycles [1]
According to data experimental X-ray diffraction pattern it was determined that the peak diffraction (2θ = 23, 32, 40, 46, 52, 58, 68) for the obtained material is well indexed with the cubic phase of LaMnO3
Summary
Electrochemical capacitors (EC) are one of the most promising electrical energy storage devices. ECs fill the gap between batteries and conventional capacitors, demonstrating a relatively high specific energy and power, as well as the ability to operate at a significant number of charge/discharge cycles [1]. These limitations are the main impetus for the implementation of non-standard solutions to problems related to the values of battery parameters, in particular the relatively small number of charge / discharge cycles and insufficiently high specific power and specific energy. HEC is characterized by two mechanisms of charge accumulation: the Faraday process and the double electric layer (DEL). The second mechanism is characterized by the formation of a double electric layer at the interface between the electrode material and the electrolyte [4]. Increasing the capacity and stability of the charge-discharge cycle are the main reasons for finding new electrode materials for both EC and HEC [5]
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