Structural Effects and Charge-Discharge Characteristics of Mg-C/Mg-Li Alloy Thin Film Materials

Abstract

Magnesium-carbon powders and Magnesium-lithium powders were used as the anode materials for lithium ion batteries to investigate the structure and electrochemical behavior in room temperature. The composition of Mg-C powders contained 1 : 1 and 9 : 1. The powders and the thermal evaporated films of Mg-10Li were compared with Mg-C systems. In addition, Mg-10Li thermal evaporated film was used as the experimental materials to process the annealing treatment. The results show that Mg-C powders system had the interface effect of a Cu foil to reduce the electrochemical reaction. With increasing the carbon powder content, the charge-discharge characteristics of Mg-C powders was raised. Notably, the Mg-10Li specimen had better cycling properties than that of Mg-50C (1 : 1). After annealing at 200 C for 1 h, Mg-10Li alloy film not only increased the capacity, but also improved the charge-discharge cyclability.

Improvement of Charge‐Discharge Characteristics of the Mg‐Ni Powder Electrodes at 55°C

“…Adding poor-activity elements into a pure metal matrix reduces the volume expansion of an electrode. Studies on alloy electrode materials have focused on Sn- [2], Si- [3], and Mg-based alloys [4,5]. Of the electrodes based on these alloys, Mg-based ones are one of the potential material in Li-ion battery applications.…”

“…Many studies have indicated that Mg-based alloy electrode, such as Mg-Li, Mg-C, and Mg-Ni alloys, can enhance battery performance via various electrochemical mechanisms [4,[6][7][8]. Adding Li into Mg can enhance the efficiency of lithiation and delithiation [9] and Mg-C alloys can restrain the growth of the solid electrolyte interface (SEI) layer [4]. In the present study, Mg-Ni powder electrodes were fabricated to suppress the volume change of the electrode and increase oxidation resistance.…”