摘要
以Li Ni0.5Co0.2Mn0.3O2和Li Mn0.7Fe0.3PO4混合材料为正极活性物质、人造石墨为负极活性物质,制备锂离子电池。两种正极材料均为球形,粒径分布相近,D50分别为7.93μm和7.21μm。差示扫描量热测试结果表明：混合正极的热分解温度较高（263℃）且放热量小。分别以Li Ni0.5Co0.2Mn0.3O2、Li Mn0.7Fe0.3PO4和两者质量比为78∶22的混合材料制备电池,以1 C在3.0-4.2 V充放电,循环300次的容量保持率分别为92.8%、97.0%和97.6%。混合正极电池2 C倍率放电容量保持率为94.0%,在针刺和过充等测试过程中不起火、不爆炸。
Li-ion battery was prepared by using LiNi0. 5 Co0.2 Mn0.3 O2 and LiMn0.7 Fe0.3 PO4 blended material as cathode active material, artificial graphite as anode active material. Two kinds of cathode materials were spherical structure and had the same particle size distribution, D50 was 7.93 μm and 7.21 μm, respectively. Differential scanning calorimetry measurement results showed that the decomposed temperature was much higher（263℃）and the releasing heat of the blended cathode was low. When cycled 300 times with 1 C in 3.0 - 4. 2 V, the capacity retention of batteries prepared by LiNi0. 5 Co0.2 Mn0.3 O2, LiMn0.7 Fe0.3 PO4 and blended material （ mass ratio was 78： 22） respectively was 92. 8% , 97.0% and 97. 6% , respectively. The 2 C rate discharge capacity retention of blended cathode battery was 94. 0% , it was no fire and no explosion through the test of needle-punch and overcharge.
出处
《电池》
CAS
CSCD
北大核心
2014年第6期331-334,共4页
Battery Bimonthly
基金
国家高技术研究发展(863)计划(2012AA110204)
关键词
混合正极
锂离子电池
性能
blended cathode
Li-ion battery
performance
