低壓氬氣/氫氣/氧氣電漿處理錳酸鋰混合型超級電容

Abstract

本研究將氯化鋰與硝酸亞錳之混合稠狀前驅漿料以網版網印法均勻塗布於碳纖維布上，接著在高溫爐管中以400°C之溫度煅燒6小時，藉此將前驅漿料轉化為錳酸鋰晶體，完成錳酸鋰混合型超級電容。之後分別使用純氬氣、氬氣與5%氫氣之混氣、氬氣與5%氧氣之混氣的低壓電漿對錳酸鋰混合型超級電容進行表面處理，處理後的試片在1 M硫酸鋰之液態電解液中以三電極系統進行電化學量測，採用銀/氯化銀(Ag/AgCl)和鉑(Pt)分別作為水系參考電極與對電極，並透過循環伏安法(CV)、定電流充放電法(GCD)、電化學阻抗譜(EIS)對錳酸鋰混合型超級電容進行測試。實驗結果顯示低壓電漿處理確實能有效改善混合型超級電容之性能，特別是在氬氣與5%氧氣之混氣條件下，其面電容量上升約24 %，達到了23.12 µA h/cm2，此外其庫倫效率和容量保持率相對於未處理之試片也有顯著提升。

In this study, LiCl and Mn(NO3)2•4H2O are mixed together and applied onto a carbon cloth substrate using screen-printing method. The resulting sample is then heated at 400°C for 6 h in a tube furnace, resulting in the formation of LiMn2O4 Li-ion hybrid supercapacitors (Li-HSCs). The Li-HSCs are then subjected to low-pressure plasma (LPP) treatment using Ar, Ar+5%H2, or Ar+5%O2. The three-electrode setup is used, with the treated LiMn2O4 Li-HSCs serving as the working electrode, while Pt and Ag/AgCl electrodes are used as counter and reference electrodes, respectively. The LiMn2O4 Li-HSCs are characterized using cyclic voltammetry, galvanostatic charging/discharging, and electrochemical impedance spectroscopy. The results indicate that treatment with Ar+5%O2 plasma leads to a significant improvement in the areal capacity of the LiMn2O4 Li-HSCs, increasing it by approximately 24% to 23.12 μA h/cm2. This treatment also enhances the capacity retention rate and coulomb efficiency of the LiMn2O4 Li-HSCs.