摘要
以熔喷非织造布为基材，在表面浸溃4％、6％和8％质量分数的纳米SiO2颗粒，再涂覆粘结剂聚偏氟乙烯，得到锂离子电池用非织造复合隔膜。对非织造复合隔膜的微孔结构、孔径、孔隙率、吸液性能及电化学性能等进行测试。非织造复合隔膜的孔径大于聚烯烃隔膜，但孔隙率、耐热性能更好，制备的电池的电化学性能更好。SiO2质量分数为6％的非织造复合隔膜、聚烯烃隔膜组装的电池以0．2C在4．5～2．5V充放电，首次放电比容量分别为175．7mAh／g、138．0mAh／g，循环30次的放电容量保持率分别为99．1％、97．9％。
Melt-blown nonwovens were used as substrate portion,4% ,6% and 8% （mass ratio）nano-SiO2 was impregnated on the surface and poly（ vinylidene fluoride）was coated as adhesive, nonwoven composite separator for Li-ion battery was prepared. The micropore structure, pore-size, porosity, absorbent property and electrochemical performance of the nonwoven composite separator were analyzed. The pore-size of nonwoven composite separator was larger than polyolefin separator, but its porosity and heat resistance were better, the electrochemical performance of assembled cell was better. When charged-discharged in 4. 5 ~ 2. 5 V at 0. 2 C, the initial specific discharge capacity of ceils assembled with the nonwoven composite separator with the mass ratio of SiO2 was 6% and polyolefin separator was 175.7 mAlt/g, 138.0 mAh/g,respectively. The discharge capacity retention rate after 30 cycles was 99. 1% ,97.9% ,respectively.
出处
《电池》
CAS
CSCD
北大核心
2015年第2期78-81,共4页
Battery Bimonthly
