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首頁 > 資料下載 > 機械合金化條件對儲氫材料Mg63Ni30Y7微觀結構和電化學特性的影響

機械合金化條件對儲氫材料Mg63Ni30Y7微觀結構和電化學特性的影響

  發布時間:2017/12/26 點擊量:3599

在可充(chong)電(dian)(dian)電(dian)(dian)池應(ying)用(yong)(yong)領域,金(jin)(jin)屬間化(hua)(hua)(hua)(hua)(hua)合(he)物Mg2Ni(形成(cheng)Mg2NiH4氫(qing)化(hua)(hua)(hua)(hua)(hua)物)可作(zuo)為(wei)一種儲氫(qing)材(cai)料而(er)受到(dao)越來越大(da)的(de)(de)關注。理(li)論上(shang)講,H元素質量分數占到(dao)Mg2NiH4氫(qing)化(hua)(hua)(hua)(hua)(hua)物的(de)(de)3.6%,其(qi)電(dian)(dian)池放(fang)電(dian)(dian)能(neng)(neng)力(li)(li)應(ying)達到(dao)1000mAh/g,但實際上(shang)只有8mAh/g,這主(zhu)要(yao)是Mg2Ni晶粒表層(ceng)(ceng)快速形成(cheng)的(de)(de)氫(qing)化(hua)(hua)(hua)(hua)(hua)物層(ceng)(ceng)嚴重(zhong)阻礙了(le)氫(qing)原子擴散(san)。而(er)通過機(ji)(ji)(ji)(ji)械(xie)合(he)金(jin)(jin)化(hua)(hua)(hua)(hua)(hua)的(de)(de)方法制(zhi)(zhi)備(bei)非(fei)晶態和納米晶粉(fen)末(mo)可以極大(da)提高(gao)(gao)(gao)氫(qing)擴散(san)能(neng)(neng)力(li)(li),增強(qiang)其(qi)氫(qing)化(hua)(hua)(hua)(hua)(hua)—去氫(qing)化(hua)(hua)(hua)(hua)(hua)反應(ying)動(dong)力(li)(li)。文章以Mg2Ni和稀土金(jin)(jin)屬Y為(wei)實驗材(cai)料,在不(bu)同(tong)機(ji)(ji)(ji)(ji)械(xie)合(he)金(jin)(jin)化(hua)(hua)(hua)(hua)(hua)條(tiao)件(jian)下,包(bao)括不(bu)同(tong)的(de)(de)研(yan)(yan)(yan)磨(mo)機(ji)(ji)(ji)(ji)類型、研(yan)(yan)(yan)磨(mo)周(zhou)期(qi)(qi)、研(yan)(yan)(yan)磨(mo)溫度等,研(yan)(yan)(yan)究了(le)合(he)金(jin)(jin)化(hua)(hua)(hua)(hua)(hua)粉(fen)末(mo)的(de)(de)化(hua)(hua)(hua)(hua)(hua)學成(cheng)分、微觀結(jie)(jie)構和形態、熱穩定性(xing)以及電(dian)(dian)特性(xing)等。結(jie)(jie)果顯(xian)(xian)示(shi)(shi):采(cai)用(yong)(yong)SPEX 8000系列高(gao)(gao)(gao)能(neng)(neng)研(yan)(yan)(yan)磨(mo)機(ji)(ji)(ji)(ji)制(zhi)(zhi)備(bei)的(de)(de)合(he)金(jin)(jin)化(hua)(hua)(hua)(hua)(hua)粉(fen)末(mo)具備(bei)納米晶相(xiang)(xiang)—非(fei)晶相(xiang)(xiang)相(xiang)(xiang)間的(de)(de)微觀結(jie)(jie)構,陽極極化(hua)(hua)(hua)(hua)(hua)曲線顯(xian)(xian)示(shi)(shi)出更(geng)高(gao)(gao)(gao)電(dian)(dian)流密度13-18mA/g,充(chong)放(fang)電(dian)(dian)測試曲線顯(xian)(xian)示(shi)(shi)出具備(bei)更(geng)高(gao)(gao)(gao)的(de)(de)zui大(da)放(fang)電(dian)(dian)能(neng)(neng)力(li)(li)247mAh/g,所需(xu)研(yan)(yan)(yan)磨(mo)周(zhou)期(qi)(qi)更(geng)短(第(di)二個循(xun)環),且無需(xu)液氮冷(leng)凍(dong)輔助研(yan)(yan)(yan)磨(mo);而(er)Retsch PM 4000行星(xing)式研(yan)(yan)(yan)磨(mo)機(ji)(ji)(ji)(ji)制(zhi)(zhi)備(bei)的(de)(de)合(he)金(jin)(jin)化(hua)(hua)(hua)(hua)(hua)粉(fen)末(mo)主(zhu)要(yao)由非(fei)晶相(xiang)(xiang)組成(cheng),無納米晶生成(cheng),陽極極化(hua)(hua)(hua)(hua)(hua)曲線顯(xian)(xian)示(shi)(shi)其(qi)電(dian)(dian)流密度僅(jin)為(wei)3mA/g,需(xu)要(yao)更(geng)長的(de)(de)研(yan)(yan)(yan)磨(mo)周(zhou)期(qi)(qi)(第(di)五個循(xun)環)獲得zui大(da)的(de)(de)放(fang)電(dian)(dian)能(neng)(neng)力(li)(li)216mAh/g,且每個周(zhou)期(qi)(qi)間隔需(xu)要(yao)對(dui)研(yan)(yan)(yan)磨(mo)罐進行液氮冷(leng)卻處理(li)。

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