NMP对LA132制备的正极片性能的影响

Effect of NMP on cathode prepared with water-based binder LA132

采用商品化的磷酸铁锂（LiFePO_4）、N-甲基吡咯烷酮（NMP）和水性粘结剂LA132作为原料,制备LiFePO_4正极片,从极片粘附力、柔韧性及电化学性能等方面,研究NMP对采用水系粘结剂LA132制备的正极片性能的影响。当w（NMP）≤3%时,正极片的粘附力从20 N/m增加到50 N/m,柔韧性从D10提高到D1;当w（NMP）≤1%时,电池以1.0 C的电流在2.5~4.2 V循环300次,容量衰减小于8%,且不影响极片活性物质的充放电比容量及充放电特性。

Commercial lithium iron phosphate（ LiFePO_4）,N-methyl-2-pyrrolidone（ NMP） and LA132 were used to produce cathode. The adhesion and flexibility and electrochemical performance were investigated. When w（ NMP） ≤ 3%,the adhesion increased from 20 N/m to 50 N/m,the flexibility increased from D10 to D1;when w（ NMP） ≤1%,the battery capacity attenuation was less than 8% after 300 cycles which didn＇t affect capacity of the anode materials（ voltage 2. 5 ~ 4. 2 V,current 1. 0 C）.