(1. 內(nèi)蒙古師范大學(xué) 物理與電子信息學(xué)院 功能材料物理與化學(xué)自治區(qū)重點(diǎn)實(shí)驗(yàn)室，呼和浩特 010022；
2. 北京大學(xué) 化學(xué)與分子工程學(xué)院，北京 100871)
摘 要: 采用X射線(xiàn)衍射(XRD)和掃描電鏡(SEM)研究不同球磨時(shí)間下多壁碳納米管(CNTs)的微觀結(jié)構(gòu)。XRD分析表明：隨著球磨時(shí)間的延長(zhǎng)，CNTs的衍射峰明顯變?nèi)酰橛胁糠盅苌浞逑АEM結(jié)果發(fā)現(xiàn)：球磨使細(xì)長(zhǎng)的CNTs斷裂，長(zhǎng)度明顯變短；隨球磨時(shí)間的進(jìn)一步延長(zhǎng)，CNTs空心管狀結(jié)構(gòu)破損。采用電化學(xué)方法測(cè)試添加未球磨和球磨不同時(shí)間CNTs導(dǎo)電劑的AB5型儲(chǔ)氫合金電極的電化學(xué)性能。結(jié)果表明：隨球磨時(shí)間的延長(zhǎng)，合金電極的最大放電容量、放電性能及循環(huán)穩(wěn)定性均呈現(xiàn)出先提高后減弱的變化規(guī)律。當(dāng)CNTs的球磨時(shí)間為2 h時(shí)，合金電極的最大放電容量和放電性能達(dá)最佳；當(dāng)CNTs的球磨時(shí)間為2.5 h時(shí)，合金電極的循環(huán)穩(wěn)定性最佳。
關(guān)鍵字: 碳納米管；球磨；儲(chǔ)氫合金電極；電化學(xué)性能
（1. Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, School of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022, China;
2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China）
Abstract:The microstructures of carbon nanotubes (CNTs) after milling for different time were characterized by XRD and SEM. XRD analysis results indicate that the intensity of the diffraction peaks of the milled carbon nanotubes signi？cantly decreases with increasing milling time. In addition, as the milling time increasing, all diffraction peaks gradually weaken and some peaks disappear. SEM observations show that ball milling is a good method to cut long CNTs into short ones. The tubular structure of CNTs is destroyed after milling for a long time. The electrochemical properties of AB5-type alloy electrodes added unmilled and milled CNTs were investigated. The results indicate that the maximum discharge capacities, discharge properties and cycle stabilities of the alloy electrodes improve firstly, and then degenerate with increasing of ball-milling time. The alloy electrode added CNTs milling for 2 h exhibits the best discharge capacity and discharge property. The alloy electrode added CNTs milling for 2.5 h shows the best cycle stability.
Key words: carbon nanotube; ball milling; hydrogen storage alloy electrode; electrochemical property
