边锋游戏

4.6V高电压钴酸锂锂离子电池正极材料研究获进展
发布时间:2019-06-27 09:55:00
关键词:动力电池锂电池

4.6V高电压钴酸锂锂离子电池正极材料研究获进展


钴酸锂(LiCoO2)是最早商业化的锂离子电池正极材料。由于其具有很高的材料密度和电极压实密度,使用钴酸锂正极的锂离子电池具有最高的体积能量密度,因此钴酸锂是消费电子市场应用最广泛的正极材料。随着消费电子产品,特别是5G手机等对锂离子电池续航时间和体积大小的要求不断提高,迫切需要进一步提升电池体积能量密度。提高钴酸锂电池的充电电压可以提高电池的体积能量密度,其充电截止电压已经从1991年最早商业化时的4.20V逐渐提升至4.45V(vs Li+/Li),体积能量密度已经超过700Wh/L。


MUQIAN,KAIFAXIAYIDAIGENGGAODIANYADEGUSUANLICAILIAOYIJINGCHENGWEIKEYANJIEJIQIYEGONGTONGGUANZHUDEREDIAN。SUIZHECHONGDIANDIANYADETIGAO,GUSUANLICAILIAOHUIZHUJIANCHUXIANBUKENIJIEGOUXIANGBIAN、BIAOJIEMIANWENDINGXINGXIAJIANG、ANQUANXINGNENGXIAJIANGDENGWENTI,XIANZHILEQISHIJIYINGYONG。TONGCHANGYANJIURENYUANTONGGUOCAIYONGDUOZHONGYUANSUHENLIANGCHANZADESHOUDUANDUIGUSUANLICAILIAOJINXINGGAIXING,YITISHENGQIZAIGAODIANYACHONGFANGDIANGUOCHENGZHONGDEWENDINGXING。LIJIEBUTONGCHANZAYUANSUDEZUOYONGJIZHIDUIYUSHEJIXINGNENGGENGJIADEGUSUANLICAILIAOZHIGUANZHONGYAO,RANERSHIYANSHANGQUEDINGGEHENLIANGCHANZAYUANSUDEZUOYONGJIZHICUNZAITIAOZHAN。


边锋游戏ZHONGGUOKEXUEYUANWULIYANJIUSUO/BEIJINGNINGJUTAIWULIGUOJIAYANJIUZHONGXINQINGJIENENGYUANSHIYANSHIE01ZUBOSHIZHANGJIENAN、LIQINGHAO,ZAIYANJIUYUANLIHONGHEYUXIQIANDEZHIDAOXIA,CAIYONGTi、Mg、AlSANZHONGYUANSUHENLIANGCHANZA(CHANZABILI <0.1 wt%),SHIDEGUSUANLICAILIAOZAI4.6 VGAODIANYACHONGFANGDIANGUOCHENGZHONGDEXUNHUANWENDINGXINGHEBEILVTEXINGDEDAOLEJIDADETISHENG(TU1)。GAITUANDUIJINYIBUYUMEIGUOBULUKEHAIWENGUOJIASHIYANSHI、SITANFUGUOJIAJIASUQISHIYANSHI、MEIGUOLAOLUNSIBOKELIGUOJIASHIYANSHI、JIANGXISHIFANDAXUEHEHUNANDAXUEDENGXIANGGUANYANJIUJIGOUHEZUO,LIYONGTONGBUFUSHEXSHEXIANNAMISANWEICHENGXIANG、GONGZHENFEIDANXINGXSHEXIANSANSHEDENGXIANJINSHIYANJISHUXITONGDIYANJIULETi、Mg、AlHENLIANGCHANZADUIGUSUANLICAILIAOXINGNENGTISHENGDEZUOYONGJIZHI,JIESHILEBUTONGCHANZAYUANSUDUICAILIAOXINGNENGGAISHANDEDUTEZUOYONG。GAIYANJIUJIEGUOJINRIFABIAOZAI《ZIRAN-NENGYUAN》SHANG(Nature Energy,2019,DOI: 10.1038/s41560-019-0409-z),WENZHANGTIWEITrace doping of multiple elements enables stable battery cycling of LiCoO2 at 4.6 V。


边锋游戏YANJIUTUANDUISHOUXIANLIYONGGAOFENBIANTOUSHEDIANJINGJIEHEEDS\EELSBIAOZHENG,TANSUOLEBUTONGCHANZAYUANSUZAICAILIAOKELIBIAOMIANJITIXIANGNEIDEFENBUGUILV,JIEGUOBIAOMING,ZAIXIANGTONGDECAILIAOHECHENGTIAOJIANXIA,MgHEAlYUANSUGENGRONGYICHANZAJINRUCAILIAODEJINGTIJIEGOUZHONG,ERTiYUANSUZEQINGXIANGYUZAIGUSUANLIKELIBIAOMIANFUJI。SHIYANSHIYUANWEIXSHEXIANYANSHEJIEGUOXIANSHI,CHANZAJINRUGUSUANLIJINGGEDEMg、AlKEYIYIZHI4.5 VGAODIANYACHONGFANGDIANSHICHUXIANDEJIEGOUXIANGBIAN,GAIJIEGOUXIANGBIANBEIPUBIANRENWEISHIDAOZHIGUSUANLICAILIAOZAIGAODIANYACHONGFANGDIANXIAXINGNENGSHUAIJIANDEZHUYAOYUANYINZHIYI。


随后,通过同步辐射X射线三维成像技术发现Ti在钴酸锂颗粒中呈现不均匀分布,Ti元素不仅富集于钴酸锂颗粒表面,还会在颗粒内部的晶界处富集,能够为钴酸锂颗粒内部一次颗粒之间提供良好的界面接触,从而提升材料的倍率性能(图2)。进一步利用共振非弹性X射线散射(RIXS)技术发现富集在表面的Ti元素可以有效地抑制高电压下材料表面氧离子的氧化活性,从而减缓高电压下材料与有机电解液边锋游戏的副反应,稳定材料的表面(图3)。最后,通过第一性原理计算,研究团队从理论上进一步确认了Ti元素的掺杂规律及改性原理,认为Ti元素倾向于在材料表面掺杂,能够对其周边的氧原子在脱锂态下的电荷分布进行调节,有效降低其氧化活性。


边锋游戏GAIGONGZUOJIESHILETi、Mg、AlGONGCHANZADUIGUSUANLICAILIAOXINGNENGTISHENGDEZUOYONGJIZHI,CHANMINGLECONGJINGTIJIEGOU、DIANZIJIEGOUHECAILIAOYAWEIMICHIDUWEIGUANJIEGOUDENGBUTONGWEIDUCAILIAOZONGHESHEJIDUIYUTISHENGCAILIAOXINGNENGDEZHONGYAOXING,WEISHEJIGAODIANYA、GAORONGLIANGZHENGJICAILIAOTIGONGLELILUNYIJU。TONGSHIYEZHANXIANLEDUOCHIDU、GAOJINGDUDEFENXIBIAOZHENGFANGFADUIYUJIESHICAILIAONEIZAIWULIHUAXUEGUOCHENGDEZHONGYAOXING。GAIGONGZUODEDAODEJIELUNDUIYUQITADIANCHITIXIDIANJICAILIAOSHEJITONGYANGJUYOUJIEJIANYIYI。XIANGGUANGONGZUODEDAOKEJIBUZHONGDIANYANFAJIHUA(2016YFB0100100)、JIJINWEICHUANGXINQUNTIJIJIN(51421002)HEJIJINWEIYOUXIUQINGNIANJIJIN(51822211)DEZHICHI。


4.6V高电压钴酸锂锂离子电池正极材料研究获进展

TU1. Ti、Mg、AlGONGCHANZALiCoO2(TMA-LCO)YUWEICHANZALiCoO2(Bare-LCO)DEBANDIANCHIHEQUANDIANCHIXINGNENGDUIBI


边锋游戏TU2. TONGBUFUSHEXSHEXIANSANWEICHENGXIANGJISHUJIESHITi、AlHECoYUANSUZAILiCoO2KELIZHONGDEKONGJIANFENBU


TU3. GONGZHENFEIDANXINGXSHEXIANSANSHE(RIXS)JIEGUOBIAOMINGTi、Mg、AlCHANZALiCoO2CAILIAOCHONGDIANZHIGAODIANYAZHUANGTAISHIYANGLIZIDEYANGHUAHUOXINGBEIYIZHI,SHIDECAILIAOJUYOUGENGWENDINGDEBIAOMIAN


稿件来源: 中国科学院网站
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