LiCoO_2/LiNi_(0.8)Co_(0.15)Al_(0.05)O_2混合正极材料过充电行为研究

Research on the overcharge characteristic of LiCoO_2/LiNi_(0.8)Co_(0.15)Al_(0.05)O_2 mixture

采用质量比为50∶50的钴酸锂和镍钴铝锂制成混合正极材料,并对其充放电曲线特征和耐过充电性能进行了研究。结果表明:与单一钴酸锂材料相比,混合材料中的镍钴铝锂在充放电过程中先主要被充电,而放电过程中,钴酸锂先主要被放电;当电池过充电4.8 V后,混合材料表现出较优异的耐过充性能。

The charge/discharge characteristics and overcharge performance of LiCoO2 were investigated by mixing with LiNi0.8Co0.15Al0.15O2 in the weight ratio 50：50. The results showed that,LiNi0.8Co0.15Al0.15O2 was first charged in mixture electrode and the reverse results obtained during the discharge process. The 4.8 V overcharge performance of LiCoO2 was significantly improved by mixing withLiNi0.8Co0.15Al0.15O2.