边锋游戏

提高锂电池正极极片的压实密度
发布时间:2019-05-16 10:18:00
关键词:动力电池 锂电池

TU1 JIPIANYAZHISHENGCHANXIANSHIYITU


一般来说,在材料允许的压实范围内,极片压实密度越大,电池的容量就能做的越高,所以压实密度也被看做材料能量密度的参考指标之一。但是一味的追求高压实,不但替身不了电池的比容量,还会严重降低电池比容量和循环性能。


压实密度越大,材料颗粒之间的挤压程度会越大,极片的孔隙度就会越小,极片的吸收电解液的性能就会越差,电解液越难以浸润,那么直接的后果就的材料的比容量发挥较低,电池的保液能力较差,电池循环过程中极化就大,衰减就会较大,内阻增加也尤为明显。因此合适的正极压实密度可以增大电池的放电容量,减小内阻,减小极化损失,延长电池的循环寿命,提高锂离子电池的利用率。在压实密度过大或过小时,不利于锂离子的嵌入嵌出。那么影响正极极片压实密度的压实密度有哪些呢?


影响压实密度的因素


影响正极极片压实密度的主要因素主要有以下四点:

①CAILIAOZHENMIDU

②CAILIAOXINGMAO

③CAILIAOLIDUFENBU

④JIPIANGONGYI。


CAILIAOZHENMIDU


边锋游戏MUQIANJIZHONGSHANGYECHANGJIADEZHENGJICAILIAODEZHENMIDUHEMUQIANSUONENGDADAODEYASHIMIDUJIANBIAO(BIAOZHONGSUOXUANSANYUANCAILIAOWEINCM111),KEYIKANCHU,JIZHONGCAILIAODEZHENMIDU:GUSUANLI>SANYUANCAILIAO>MENGSUANLI>LINSUANTIELI,ZHEIHEYASHIMIDUDEGUILVYIZHI。XUYAOZHICHUDESHI,BUTONGZUFENSANYUANCAILIAODEZHENMIDUSUIZUFENDEBIANHUAERBIANHUA。


JIZHONGSHANGYEZHENGJICAILIAODEZHENMIDUHEYASHIMIDUFANWEI


CAILIAOXINGMAO


SANYUANCAILIAOHEGUSUANLIDEZHENMIDUCHABIEBINGBUDA,CONGSHANGBIAOKEYIKANCHU,NCM111HEGUSUANLIDEZHENMIDUZHICHA0.3g·cm-3,YASHIMIDUQUEBIGUSUANLIDI0.5g·cm-3,SHENZHIGENGGAO,DAOZHIZHEIGEJIEGUODEYUANYINHENDUO,DANZUIZHUYAODEYUANYINSHIGUSUANLIHESANYUANCAILIAODEXINGMAOCHABIE。


边锋游戏MUQIANSHANGYEHUADEGUSUANLISHIYICIKELI,DANJINGHENDA,SANYUANCAILIAOZEWEIXIXIAODANJINGDEERCITUANJUTI,RUTUSUOSHI。CONGTUZHONGKEKANCHU,JIBAInmDEYICIKELITUANJUCHENGDESANYUANCAILIAOERCIQIU,BENSHENJIUYOUHENDUOKONGXI;ERZHIBEICHENGJIPIANHOU,QIUHEQIUZHIJIANYEHUIYOUDALIANGDEKONGXI。YISHANGYUANYINSHISANYUANCAILIAODEYASHIMIDUJINYIBUJIANGDI。


边锋游戏GUSUANLIHESANYUANCAILIAOSEMTU


CAILIAOLIDUFENBU


边锋游戏DENGJINGQIUZAIDUIJISHI,QIUTIHEQIUTIZHIJIANHUIYOUDALIANGDEKONGXI,RUOMEIYOUHESHIDEXIAOLIJINGQIULAITIANBUZHEIXIEKONGXI,DUIJIMIDUJIUHUIHENDI。SUOYIHESHIDELIDUFENBUNENGTIGAOCAILIAODEYASHIMIDU,ERBUHELIDELIDUFENBUZEZAOCHENGYASHIMIDUXIANZHUJIANGDI。


JIPIANGONGYI


JIPIANDEMIANMIDU,NIANJIEJIHEDAODIANJIDEYONGLIANGDOUHUIYINGXIANGYASHIMIDU。CHANGJIANDAODIANJIHENIANJIEJIDEZHENMIDUJIANRUBIAO。CONGBIAOZHONGKEYIKANCHU。


CHANGJIANDAODIANJIHENIANJIEJIDEZHENMIDU


CAILIAODEZHENMIDUDUIYASHIMIDUDEYINGXIANGSHIWUFAGAIBIANDE,DANCONGYASHIMIDUHEZHENMIDUDEDUIBIZHONGKEYIKANCHU,SANYUANCAILIAODEYASHIMIDUHAIYOUHENDADETISHENGKONGJIAN。


如何提高压实密度


边锋游戏MUQIANTIGAOYASHIMIDUDEFANGFAZHUYAOCONGCAILIAOXINGMAO、CAILIAOLIDUFENBU、JIPIANGONGYISANFANGMIANRUSHOU。LIRUJIANGSANYUANCAILIAODEXINGMAOZHIBEICHENGHEGUSUANLILEISIDEDADANJING;YOUHUASANYUANCAILIAOLIDUFENBU;JIPIANZHIZUOSHISHIYONGDAODIANXINGHAODEDAODIANJIYIJIANGDIDAODIANJIYONGLIANG,DIAOJIANGGUOCHENGGAOSUFENSAN,SHIDAODIANJIHENIANJIEJIJUNYUNFENSANDENGDENG。


边锋游戏XIAMIANSHICONGYOUHUASANYUANCAILIAOXINGMAOHELIDUFANGMIANLAITISHENGSANYUANCAILIAOYASHIMIDUDESHILI。


YOUHUAXINGMAO


CHANGJIANJIZHONGSANYUANCAILIAODEXINGMAOJIQIJIPIAN(GUNYAHOU)DESEMTURUTUSUOSHI。QIZHONG(a)、(c)、(e)WEISANZHONGBUTONGXINGMAODESANYUANCAILIAODESEMTU,FANGDABEISHUXIANGTONG。(b)、(d)、(f)FENBIEWEI(a)、(c)、(e)DEGUNYAHOUJIPIANDIBEISEMTU。


边锋游戏(a)SUOSHISHIZUICHANGJIANDESANYUANCAILIAOXINGMAO,JIXIAODANJINGDEERCITUANJUTI,QIGUNYAHOUDEJIPIANSEMTURU(b)SUOSHI,ERCIKELIZHIJIANYOUJIAODAKONGXI,QIEBUFENERCIKELIYIJINGBEIYASUI,BUFENMEIYOUJIECHUDAONIANJIEJIDEXIAODANJINGYIJINGTUOLUO;(c)DEXINGMAOWEIYICIDANJINGSANYUANCAILIAO,DANBI(a)DEDANJINGSHAODAYIXIE,CONGQIDUIYINGJIPIAN(d)KEYIKANCHU,DANJINGKELIZHIJIANYOUSHAOLIANGKONGXI,YINWEIBUCUNZAIERCIKELIPOSUIDEWENTI,SUOYIZHIYAONIANJIEJIFENSANJUNYUN,BIANBUCUNZAIDANJINGCONGJIPIANTUOLUODEWENTI;(e)SUIRANYESHIERCITUANJUTI,DANSHIDANJINGHENDA,DANJINGHEDANJINGZHIJIANJIECHUBINGBUSHIHENJINMI,CONGQIDUIYINGJIPIAN(f)KEYIKANCHU,KELIHEKELIZHIJIANDEKONGXIHENSHAO,RUGUOSHIYONGGAOSUHUNHEJILAIZHIBEIJIANGLIAO,XIAOGUOHUIGENGHAO。


边锋游戏TUZHONG(a)、(c)、(e)SANZHONGXINGMAODECAILIAODUIYINGDEYASHIMIDUJIEGUODUIYING(g)ZHONGDEa、c、e。CONGTUZHONGKEYIKANCHU,(a)XINGMAODECAILIAOYASHIMIDUZUIDI,DANHE(c)DEYASHIMIDUXIANGCHABUDUO,(e)DEYASHIMIDUBI(a)HE(c)DEGAOHENDUO,YIJINGDADAO3.9g·cm-3。


边锋游戏BUTONGXINGMAOSANYUANCAILIAOJIQIJIPIANSEMTU、YASHIMIDUDUIBI


YOUHUALIDUFENBU


边锋游戏D50JIEJINDECAILIAO,RUOD10、D90、Dmin、DmaxYOUCHABIE,YEHUIZAOCHENGYASHIMIDUBUTONG。LIDUFENBUTAIZHAIHUOLIDUFENBUTAIKUANDOUHUISHICAILIAOYASHIMIDUJIANGDI。DUIYULIDUFENBUDEYINGXIANG,YOUDEDIANCHICHANGJIAHUIDUIZHENGJICAILIAOSHENGCHANSHANGTICHUYAOQIU,ERYOUDEDIANCHICHANGJIAZETONGGUOHUNHEBUTONGLIDUFENBUDECHANPINLAIDADAOTIGAOYASHIMIDUDEMUDE,RUTUSUOSHI。


边锋游戏BUTONGLIDUFENBUDEZHENGJICAILIAOJIPIANSEMTU


过压


ZAOCHENGSANYUANCAILIAOJIPIANGUOYADEYUANYINYOULIANGZHONG,YIZHONGSHIDIANCHICHANGJIAWEILEZHUIQIUDIANCHIDEGAONENGLIANGMIDUDAOZHIJIPIANGUOYA,LI·RUJIANGYASHIMIDUZHIYOU3.6g·cm–3ZUOYOUDESANYUANCAILIAOYAZHI3.7g·cm–3SHENZHIGENGGAO;LINGYIZHONGSHICAILIAOCHANGJIAZHICHENGKONGZHIBUYANGE,SHIBUTONGPICISANYUANCAILIAODEYASHIMIDUBUYIZHI,DIANCHICHANGJIAWEIFENXICAILIAODEJUTIQINGKUANG,ANZHAOCHANGGUIGONGYICANSHUZHIBEIJIPIANSHIJIANGJIPIANGUOYA。


GUOYAHOUJIPIANDESEMTU


JIPIANGUOYAHUIZAOCHENGDIANCHIRONGLIANGJIANGDI,XUNHUANEHUA,NEIZUZENGJIADENGWENTI。SHOUXIAN,JIPIANGUOYAHUISHIQIUXINGSANYUANCAILIAODAMIANJIPOSUI,XINCHANSHENGDEBIAOMIANYOUHENDUOTUOLILEERCIQIUDEYICIXIAOKELI,TAMENYAOMEYINWEIMEIYOUJIECHUDAOPVDFERCONGJIPIANSHANGDIAOLUO,YAOMEYINWEIMEIYOUJIECHUDAODAODIANJIERSHIJIPIANDAODIANXINGNENGJUBUEHUA。XINBIAOMIANDECHANSHENGYESHIBIBIAOMIANZENGDA,YUDIANJIEYEDEJIECHUMIANZENGDA,FUFANYINGZENGJIA,CONGERZAOCHENGDIANCHIXINGNENGJIANGDI,RUDIANCHIQIZHANG、XUNHUANSHUAIJIANDENG。GUOYAHAIHUIZAOCHENGLVBOBIANXING,JIPIANCUIPIAN,RONGYIZHEDUAN,DIANCHINEIZUZENGJIA。


边锋游戏LINGWAI,GUOYADEJIPIANZHONG,CAILIAOKELIZHIJIANDEJIYACHENGDUGUODA,ZAOCHENGJIPIANKONGXILVDI,JIPIANXISHOUDIANJIEYEDELIANGYEHUIJIANGDI,DIANJIEYENANYISHENTOUDAOJIPIANNEIBU,ZHIJIEDEHOUGUOJIUSHICAILIAODEBIRONGLIANGFAHUIBIANCHA。BAOYENENGLICHADEDIANCHI,XUNHUANGUOCHENGZHONGJIHUAHENDA,SHUAIJIANHENKUAI,NEIZUZENGJIAMINGXIAN。


JIPIANSHIFOUGUOYAKEYITONGGUOGUANCHAJIPIANSHIFOUCUIPIAN、ZUODIANJINGCHAKANCAILIAOSHIFOUBEIPOSUI、GUSUANJIPIANKONGXILVDENGFANGFALAIPANDUAN。QIZHONGJIPIANKONGXILVSHIPANDUANJIPIANXIYELIANG、XIYESULVDEYIXIANGZHONGYAOZHIBIAO,DUIDIANCHIXINGNENGCHANSHENGZHIJIEYINGXIANG。


边锋游戏JIPIANKONGXILVSHIZHIJIPIANGUNYAHOUNEIBUKONGXIDETIJIZHANGUNYAHOUJIPIANZONGTIJIDEBAIFENLV。JIPIANKONGXILVGUODIHUIJIANGDIDIANJIEYELIANGDUIJIPIANJINRUNSULV,YINGXIANGDIANCHIXINGNENGFAHUI,GUOGAOHUIJIANGDIDIANCHINENGLIANGMIDU,LANGFEIYOUXIAOKONGJIAN。BUNENGWEILEZHUIQIUNENGLIANGMIDUERGUODUTIGAOYASHIMIDU。KONGXILVDECESHIKEYICAIYONGYAGONGFA、DANXIFU、XIYEFA、GUSUANFADENG,YAGONGFAWEICHANGYONGFANGFA。XIYEFAJUTICAOZUOBUZHOURUXIA:CAIQUSHILIANGJIPIAN,BINGJILIANGSUOSHUJIPIANDEZHILIANGm;JILIANGSUOSHUJIPIANDETIJIV;JIANGSUOSHUJIPIANFANGZHIDAORONGQIZHONG,SUOSHURONGQINEISHEZHIYOUDIANJIEYEHUOQITARONGJI(RONGJIMIDUWEIρ),JIANGSUOSHUJIPIANWANQUANJINPAO,BINGJINPAOYIDINGSHIJIAN;QUCHUSUOSHUJIPIAN,FANGZHIYULVZHISHANG,XISHIZHIHENGZHONG,JILIANGSUOSHUJIPIANDEZHILIANGm1;GENJUGONGSHIε=(m1–m)/ρV×100%,JISUANJIPIANDEKONGXILVε。GUSUANFAJIAOWEIJIANDAN,GENJUCAILIAODEZHENMIDUYUJIPIANYASHIMIDUDECHAZHIKEYIGUSUANJIPIANDEKONGXILV。JIPIANKONGXILVJISUANFANGCHENGSHIRUXIA:


边锋游戏JIPIANKONGXILV(%)=(HUNHEWUZHENMIDU–JIPIANYASHIMIDU)/HUNHEWUZHENMIDU×100%  


XIABIAOJICHULESANYUANCAILIAOHEGUSUANLIZAIBUTONGYASHIMIDUXIADEKONGXILV,SHUJUYOUSHANGSHIJISUANDECHU。XIABIAODEJISUANJICHUWEI:SANYUANJIPIANZHONGBAOHAN95%DESANYUANCAILIAO,3%DAODIANJI,2%NIANJIEJI(JUNWEIZHILIANGFENSHU),SANYUANCAILIAODEZHENMIDUWEI4.8g·cm–3,DAODIANJIDEMIDUWEI1.9g·cm–3ZUOYOU,NIANJIEJIDEMIDUWEI1.78g·cm–3,NEIMEHUNHEWUDEZHENMIDUYUEWEI4.65g·cm–3。GUSUANLIJIPIANZHONGBAOHAN95%DEGUSUANLI,3%DAODIANJI,2%NIANJIEJI,LiCoO2DEZHENMIDUWEI5.1g·cm–3,DAODIANJIDEMIDUWEI1.9g·cm–3ZUOYOU,NIANJIEJIDEMIDUWEI1.78g·cm–3,NEIMEHUNHEWUDEZHENMIDUYUEWEI4.94g·cm–3。


边锋游戏SANYUANCAILIAOHEGUSUANLIZAIBUTONGYASHIMIDUXIADEKONGXILVDIANXINGZHI 


稿件来源: 锂电前沿
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