宁夏11选5

17年专注锂电池定制

三元锂电池寿命及优缺点

来源:钜大LARGE    2018-03-12    点击量:13627

什么是三元锂电池?


在自然界中,锂元素是最轻的,原子质量最小的金属,它的原子量为6.94g/mol,ρ=0.53g/cm3。锂化学性质活泼,极易失去电子被氧化为Li+,因此标准电极电位最负,为-3.045V,电化学当量最小,为0.26g/Ah,锂元素的这些特点决定了它是一种具有很高比能量的材料。三元锂电池是指采用镍钴锰三种过渡金属氧化物为正极材料的锂二次电池。它充分综合了钴酸锂良好的循环性能、镍酸锂的高比容量和锰酸锂的高安全性及低成本等特点,利用分子水平混合、掺杂、包覆和表面修饰等方法合成镍钴锰等多元素协同的复合嵌锂氧化物。是目前被广泛研究和应用的一种锂离子可充电电池。


三元锂电池寿命


宁夏11选5SUOWEILIDIANCHISHOUMINGSHIZHIDIANCHIZAISHIYONGGUOYIDUANSHIJIANHOU,RONGLIANGSHUAIJIANWEIBIAOCHENGRONGLIANG(SHIWEN25℃,BIAOZHUNDAQIYA,QIEYI0.2CFANGDIANDEDIANCHIRONGLIANG)DE70%,JIKERENWEISHOUMINGZHONGZHI。XINGYENEIYIBANYILIDIANCHIMANCHONGMANFANGDEXUNHUANCISHULAIJISUANXUNHUANSHOUMING。ZAISHIYONGDEGUOCHENGZHONG,LIDIANCHINEIBUHUIFASHENGBUKENIDEDIANHUAXUEFANYINGDAOZHIRONGLIANGXIAJIANG,BIRUDIANJIEYEDEFENJIE,HUOXINGCAILIAODESHIHUO,ZHENGFUJIJIEGOUDETANTADAOZHILILIZIQIANRUHETUOQIANDESHULIANGJIANSHAODENGDENG。SHIYANBIAOMING,GENGGAOBEILVDEFANGDIANHUIDAOZHIRONGLIANGGENGKUAIDESHUAIJIAN,RUGUOFANGDIANDIANLIUJIAODI,DIANCHIDIANYAHUIJIEJINPINGHENGDIANYA,NENGSHIFANGCHUGENGDUODENENGLIANG。


宁夏11选5SANYUANLIDIANCHIDELILUNSHOUMINGYUEWEI800CIXUNHUAN,ZAISHANGYEHUADEKECHONGDIANLIDIANCHIZHONGSHUYUZHONGDENG。LINSUANTIELIYUEWEI2000CI,ERTAISUANLIJUSHUOKEYIDADAO1WANCIXUNHUAN。MUQIANZHULIUDEDIANCHICHANGJIAZAIQISHENGCHANDESANYUANDIANXINGUIGESHUZHONGCHENGNUODAYU500CI(BIAOZHUNTIAOJIANXIACHONGFANGDIAN),DANSHIDIANXINZAIPEIZUZUOCHENGDIANCHIBAOHOU,YOUYUYIZHIXINGWENTI,ZHUYAOSHIDIANYAHENEIZUBUKENENGWANQUANYIYANG,QIXUNHUANSHOUMINGDAYUEWEI400CI。CHANGJIATUIJIANSOCSHIYONGCHUANGKOUWEI10%~90%,BUJIANYIJINXINGSHENDUCHONGFANGDIAN,BURANHUIDUIDIANCHIDEZHENGFUJIJIEGOUZAOCHENGBUKENIDESUNSHANG,RUOSHIYIQIANCHONGQIANFANGLAIJISUANDEHUA,XUNHUANSHOUMINGZHISHAOYOU1000CI。LINGWAI,LIDIANCHIRUOSHIJINGCHANGZAIGAOBEILVHEGAOWENHUANJINGXIAFANGDIAN,DIANCHISHOUMINGHUIDAFUXIAJIANGDAOBUZU200CI。


三元锂电池优缺点


SANYUANLIDIANCHIZAIRONGLIANGYUANQUANXINGFANGMIANBIJIAOJUNHENG,SHIYIKUANZONGHEXINGNENGYOUYIDEDIANCHI。SANZHONGJINSHUYUANSUDEZHUYAOZUOYONGHEYOUQUEDIANRUXIA:


Co3+:JIANSHAOYANGLIZIHUNHEZHANWEI,WENDINGCAILIAODECENGZHUANGJIEGOU,JIANGDIZUKANGZHI,TIGAODIANDAOLV,TIGAOXUNHUANHEBEILVXINGNENG。


宁夏11选5Ni2+:KETIGAOCAILIAODERONGLIANG(TIGAOCAILIAODETIJINENGLIANGMIDU),ERYOUYULiHENiXIANGSIDEBANJING,GUODUODENiYEHUIYINWEIYULiFASHENGWEICUOXIANXIANGDAOZHILINIEHUNPAI,LICENGZHONGNIELIZINONGDUYUEDA,LIZAICENGZHUANGJIEGOUZHONGDETUOQIANYUENAN,DAOZHIDIANHUAXUEXINGNENGBIANCHA。


Mn4+:BUJINKEYIJIANGDICAILIAOCHENGBEN,ERQIEHAIKEYITIGAOCAILIAODEANQUANXINGHEWENDINGXING。DANGUOGAODEMnHANLIANGHUIRONGYICHUXIANJIANJINGSHIXIANGERPOHUAICENGZHUANGJIEGOU,SHIRONGLIANGJIANGDI,XUNHUANSHUAIJIAN。


宁夏11选5NENGLIANGMIDUGAOSHISANYUANLIDIANCHIDEZUIDAYOUSHI,ERDIANYAPINGTAISHIDIANCHINENGLIANGMIDUDEZHONGYAOZHIBIAO,JUEDINGZHEDIANCHIDEJIBENXIAONENGHECHENGBEN,DIANYAPINGTAIYUEGAO,BIRONGLIANGYUEDA,SUOYITONGYANGTIJI、ZHONGLIANG,SHENZHITONGYANGANSHIDEDIANCHI,DIANYAPINGTAIBIJIAOGAODESANYUANCAILIAOLIDIANCHIXUHANGSHIJIANGENGZHANG。DANTISANYUANLIDIANCHIFANGDIANDIANYAPINGTAIGAODA3.7V,LINSUANTIELIWEI3.2V,ERTAISUANLIJINWEI2.3V,YINCICONGNENGLIANGMIDUJIAODULAISHUO,SANYUANLIDIANCHIBILINSUANTIELI,MENGSUANLIHUOZHETAISUANLIJUYOUJUEDUIYOUSHI。


安全性较差和循环寿命较短是三元锂电池的主要短板,尤其是安全性能,是一直限制其大规模配组,和大规模集成应用的一个主要因素。大量实测表明,容量较大的三元电池很难通过针刺和过充等安全性测试,这也是大容量电池中一般都要多引入锰元素,甚至混合锰酸锂一起使用的原因。500次的循环寿命在锂电池中属于中等偏下,因此三元锂电池目前最主要的应用领域是3C数码等消费类电子产品。