2022-07-19
为了获得(de)高输出电压的锂离子电池,用(yong)作电池正(zheng)极(ji)的材料(liao)应满足以下条件(jian):
1、锂的电(dian)极电(dian)位高(gao)(gao),正极材料不随电(dian)位变化,离子(zi)(zi)电(dian)导率和(he)电(dian)子(zi)(zi)电(dian)导率高(gao)(gao),有利于降低电(dian)池的内阻;
2、与有机电解质和粘结剂的良好接(jie)触,热(re)稳定性好,延长电池的使(shi)用寿命(ming)和提高电池的安全性能(neng);
3、资源丰富,价格低廉,在空气中稳定(ding),无毒等。
正(zheng)极材(cai)料是锂离(li)子电池(chi)发展的(de)(de)关(guan)键。目(mu)前锂离(li)子电池(chi)正(zheng)极材(cai)料常见的(de)(de)有钻(zuan)酸锂,但由于钻(zuan)酸锂Co在(zai)(zai)自然(ran)保护区(qu)中资源少(shao),价(jia)格昂贵且有毒性,在(zai)(zai)充电过程中容(rong)易造成(cheng)燃烧、爆(bao)炸等事故。因此(ci),对于大功率、大容(rong)量(liang)的(de)(de)发展,需要大量(liang)单体电池(chi)串(chuan)联(lian)和(he)并联(lian)的(de)(de)动力电池(chi),锂钻(zuan)的(de)(de)使用存在(zai)(zai)着巨大的(de)(de)安全隐患。
磷(lin)酸铁锂(li)原料来(lai)源广泛,价格便宜(yi),无(wu)毒环(huan)保,理(li)论比容量高(gao),与其(qi)他锂(li)离(li)(li)子(zi)电池(chi)相比,它的工(gong)作电压相对(dui)适中,这不仅考虑(lv)了(le)LiCoO2、LiNiO2和(he)LiMn2O4材(cai)料的优(you)点,还具有(you)热稳定性好(hao)、安全性能(neng)高(gao)、循环(huan)性能(neng)好(hao)等(deng)优(you)点,被认(ren)为(wei)标志着“锂(li)离(li)(li)子(zi)电池(chi)新(xin)时代的到来(lai)”,成为(wei)锂(li)离(li)(li)子(zi)动力电池(chi)正极材(cai)料的首选材(cai)料。
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