2022-06-23
锂离子电池的电解(jie)质对电池性(xing)能影响很大,电解(jie)质的化学稳定要求很高(gao),特别(bie)是(shi)在较(jiao)(jiao)高(gao)的电势和温(wen)度环(huan)境下,不容易分解(jie),具有较(jiao)(jiao)高(gao)的离子电导率,正极和负极材料必(bi)须是(shi)惰性(xing)的,不能浸出。
由于锂离子电(dian)(dian)池的高(gao)充放(fang)电(dian)(dian)电(dian)(dian)位和锂嵌在负极材料(liao)中的高(gao)化学活性(xing),要(yao)求电(dian)(dian)解液(ye)为(wei)(wei)有(you)(you)机化合物,并(bing)且不(bu)能有(you)(you)水。但因为(wei)(wei)有(you)(you)机离子的导(dao)电(dian)(dian)性(xing)差,因此需要(yao)在有(you)(you)机溶剂中添加可溶性(xing)导(dao)电(dian)(dian)盐(yan),以(yi)提高(gao)离子的导(dao)电(dian)(dian)性(xing)。
目前,锂离子(zi)电(dian)(dian)池主要(yao)采用液态(tai)电(dian)(dian)解质(zhi),其(qi)溶剂(ji)(ji)(ji)为无水(shui)有机物(wu),市场上大多数采用混合溶剂(ji)(ji)(ji)。常见的(de)有机液体电(dian)(dian)解质(zhi)一(yi)般为1molL锂/混合碳酸盐(yan)溶剂(ji)(ji)(ji)体系。适(shi)用于锂离子(zi)电(dian)(dian)池的(de)电(dian)(dian)解液作为电(dian)(dian)荷传递和(he)质(zhi)量(liang)传递过程的(de)介质(zhi),一(yi)般应(ying)满足以下要(yao)求(qiu):
1、温度(du)范围宽,高电导(dao)率,好在(1~2)× 10-3s /cm以上,锂(li)离(li)子(zi)迁移次数(shu)要高;
2、液温(wen)范(fan)围宽(kuan),至少(shao)在(zai)-20~80℃范(fan)围内是液温(wen);
3、化学稳定(ding)性好,与电极活性物质、液集、隔(ge)膜(mo)等不发生反(fan)应;
4、与电极材料相容性好,能形成稳(wen)定有效(xiao)的钝化膜;
5、良好的(de)电(dian)化学(xue)稳定性,高的(de)分解电(dian)压,降低(di)电(dian)池(chi)(chi)自放(fang)电(dian)和(he)工作时电(dian)池(chi)(chi)内部压力增加。
以上(shang)(shang)要(yao)求是锂离(li)(li)子(zi)(zi)电(dian)(dian)池(chi)低内阻(zu)、长寿命、高安全性(xing)的(de)(de)重(zhong)要(yao)保(bao)证。锂盐、有(you)机溶(rong)剂和电(dian)(dian)解质溶(rong)液的(de)(de)选择(ze)决定了电(dian)(dian)池(chi)的(de)(de)循环效(xiao)率(lv)、工(gong)作电(dian)(dian)压(ya)、工(gong)作温度和储存寿命,是锂离(li)(li)子(zi)(zi)电(dian)(dian)池(chi)发展的(de)(de)关(guan)键技术之一(yi)。从(cong)某种意(yi)义上(shang)(shang)说,液体电(dian)(dian)解质对锂离(li)(li)子(zi)(zi)电(dian)(dian)池(chi)的(de)(de)性(xing)能起着决定性(xing)的(de)(de)作用。
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近广东(dong)地区暴雨(yu)不断,导(dao)致很多地势低(di)洼地区积水(shui)(shui)严重(zhong),无数的(de)车(che)(che)辆需要(yao)涉(she)水(shui)(shui)行进,更(geng)甚至(zhi)被泡到了(le)水(shui)(shui)里。而(er)这时,问(wen)题(ti)出现了(le):即便是燃油车(che)(che)型这么成熟的(de)车(che)(che)型,在涉(she)水(shui)(shui)行驶时也有可能趴(pa)下(xia),那我(wo)的(de)新(xin)能源车(che)(che)呢?它是否足够安全,如果我(wo)没开车(che)(che),电池(chi)泡在水(shui)(shui)里会不会报废(fei)?更(geng)甚至(zhi)
电(dian)容(rong)(rong)式(shi)锂离子电(dian)池是将锂电(dian)池、超级(ji)电(dian)容(rong)(rong)和(he)(he)石墨(mo)烯结合而(er)发明的(de)(de)一种(zhong)新型电(dian)池,具有很(hen)大(da)的(de)(de)市场潜力锂电(dian)池和(he)(he)超级(ji)电(dian)容(rong)(rong)是目(mu)前(qian)应(ying)用广泛的(de)(de)两(liang)种(zhong)储(chu)能器(qi)件。它(ta)们的(de)(de)原理、特点(dian)和(he)(he)应(ying)用范围各不相同,各有优点(dian)。石墨(mo)烯自问世以来,由于(yu)其极强(qiang)的(de)(de)导电(dian)性,一直被认为(wei)是一种(zhong)革命性的(de)(de)储(chu)能材
1. 锂(li)电(dian)(dian)池(chi)是一种非常重要(yao)的电(dian)(dian)池(chi)技术(shu),被(bei)广泛(fan)应(ying)用(yong)于移动设备、电(dian)(dian)动汽车、储能(neng)系统等领域。锂(li)电(dian)(dian)池(chi)具有高能(neng)密度、轻(qing)量(liang)化和长寿命等优点,因此受(shou)到了广泛(fan)的欢迎。2. 锂(li)电(dian)(dian)池(chi)的寿命受(shou)到充电(dian)(dian)和放电(dian)(dian)次(ci)数、温(wen)(wen)度、深(shen)度充放电(dian)(dian)等多种因素的影响。为(wei)了保护锂(li)电(dian)(dian)池(chi),我们(men)需要(yao)合理(li)使用(yong)锂(li)电(dian)(dian)池(chi),避(bi)免过(guo)度充放电(dian)(dian)和高温(wen)(wen)环(huan)境。如果我们(men)能(neng)够正(zheng)确使用(yong)锂(li)电(dian)(dian)池(chi),它可...
聚合物锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi)是在锂(li)(li)(li)离子电(dian)(dian)(dian)池(chi)(chi)(chi)基础(chu)上(shang)发展起来一(yi)个(ge)分支,那(nei)么锂(li)(li)(li)离子电(dian)(dian)(dian)池(chi)(chi)(chi)的分类有哪些呢?1、根(gen)(gen)据(ju)外型分类:方形(xing)锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi)、柱形(xing)锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi);2、根(gen)(gen)据(ju)外包(bao)材料分类:铝壳(qiao)锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi)、钢壳(qiao)锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi)、软包(bao)电(dian)(dian)(dian)池(chi)(chi)(chi);3、根(gen)(gen)据(ju)正负极材料分类:钴酸(suan)锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi)、锰酸(suan)锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi)、磷酸(suan)铁锂(li)(li)(li)电(dian)(dian)(dian)池(chi)(chi)(chi)等;4、根(gen)(gen)据(ju)
目前铝(lv)(lv)壳电(dian)(dian)池(chi)(chi)是液体锂离(li)子电(dian)(dian)池(chi)(chi)的主流,几乎应用(yong)于与(yu)锂离(li)子电(dian)(dian)池(chi)(chi)相关的所(suo)有领域(yu),并(bing)向着高(gao)硬度、轻(qing)量化的技术发(fa)展(zhan),这将为(wei)市场提供更优越的电(dian)(dian)池(chi)(chi)产品。铝(lv)(lv)壳电(dian)(dian)池(chi)(chi)的工艺方(fang)法:对现有技术的不足(zu),提供了一(yi)种自动铝(lv)(lv)壳电(dian)(dian)池(chi)(chi)加工设备。锂离(li)子电(dian)(dian)池(chi)(chi)大多数(shu)都采用(yong)铝(lv)(lv)作为(wei)其的外(wai)壳,有利(li)
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