Li/FeS_2电池高电压现象及其原因剖析

Investigation on high voltage of Li/FeS_2 battery

锂/二硫化亚铁电池开路电压(OCV)和放电初期电压高于IEC标准规定的1.83 V,将其放电50%容量以内,其OCV仍回升到标准值以上。室温储存之后的电池放电至1.80 V所得容量比新制备的电池放电至1.80 V所得容量要高。化学组成及XRD分析表明,物质纯度和配方对高电压现象有一定的影响,但是第一个2 e反应的固态溶液扩散机理,可能是维持50%放电容量以内一直具有高电压现象的重要原因。

The open circuit voltage（OCV） and the initial discharge voltage of Lithium/iron disulfide battery were both higher than the IEC standard 1.83 V. The OCV would still recover above the standard value when the discharge capacity was less than 50%. When discharged to 1.8 V, the capacity of batteries stored at room temperature was higher than that of freshly prepared ones. Chemical composition and XRD analysis show that purity of material and formulas has some influence on the high-voltage phenomenon. However, solid solution diffusion mechanism at the first 2 e reaction stage might be an important reason for the batteries always with high voltage phenomenon when the discharge capacity was less than 50%.