2022-05-24
铝壳电(dian)池(chi)在(zai)生(sheng)产过(guo)程中可通(tong)过(guo)预化去除水(shui)、微(wei)量(liang)(liang)(liang)金属杂质(zhi)、微(wei)量(liang)(liang)(liang)元素(su)等杂质(zhi)；金属反应(ying)电(dian)位可能相对较(jiao)低，含量(liang)(liang)(liang)小，需要(yao)使用小电(dian)流和电(dian)压的判断；水(shui)份可以通(tong)过(guo)电(dian)化学分(fen)解(jie)将(jiang)其除掉。
铝壳电池通(tong)过(guo)做预化可以(yi)形成SEI膜(mo)，SEI膜(mo)的(de)(de)形成与电解(jie)质、负极以(yi)及(ji)预化的(de)(de)设置(zhi)密切相关。要想做好铝壳电池的(de)(de)预化，需要注意以(yi)下几方面：
1、预化(hua)电(dian)(dian)(dian)(dian)(dian)流设定(ding)(ding)：步需要一个很(hen)小(xiao)的(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)流来确定(ding)(ding)是否有金属(shu)杂质，我们可以(yi)做一个实验(yan)，在正极(ji)中加入金属(shu)粉末，用很(hen)小(xiao)的(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)流充很(hen)短的(de)(de)(de)时间，就会(hui)发现电(dian)(dian)(dian)(dian)(dian)压很(hen)难(nan)上(shang)升(sheng)；第二步主要是SEI膜的(de)(de)(de)初(chu)步形(xing)成。建议在小(xiao)电(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)情况(kuang)下，预化(hua)成30%左右(you)的(de)(de)(de)容(rong)量。建议在SEI稳定(ding)(ding)期间使用稍大的(de)(de)(de)电(dian)(dian)(dian)(dian)(dian)流预化(hua)到60%左右(you)的(de)(de)(de)容(rong)量。
2、预化电(dian)压设(she)(she)定：电(dian)压设(she)(she)置因系统而异。如果电(dian)压过高，产气导致界面不良(liang)，造(zao)成析锂。
3、预化(hua)温度设定：在(zai)较低(di)的温度下，形成的SEI膜致密且具有高阻(zu)抗。反之亦(yi)然。
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