Secondary battery, battery pack, vehicle, and stationary power supply
摘要
說明書
For each of the separators SP1 to SP5 and SP7 to SP11, it was confirmed by the microscopic ATR method whether or not a polymeric material was contained on a main surface of a cellulose nonwoven fabric having no solid electrolyte layer. The results are shown in Table 1.
(Water-Shielding Test)
For each of the separators SP1 to SP11, a water-shielding test was conducted by a method similar to the method described above. The reference value was 0 μS/cm. The result is shown in Table 1.
(Bending Test and Water-Shielding Test)
For each of the separators SP1 to SP11, a bending test was conducted by a method similar to the method described above. Next, for each test piece after the bending test, the water-shielding test was conducted by a method similar to the method described above. The result is shown in Table 1.
(Charge-and-Discharge Efficiency Measurement)
The charge-and-discharge efficiency was measured for each of the secondary batteries obtained in the examples and the comparative examples. More specifically, under a 25° C. environment, each secondary battery was charged by a constant current of 5 A until the battery voltage reached 2.8 V. Next, the state was maintained for 30 min. Next, the secondary battery was discharged by a constant current of 5 A until the battery voltage reached 2.1 V. Next, the state was maintained for 30 min. The series of operations was defined as one charge-and-discharge cycle and repeated 50 times. Next, the discharge capacity and charge capacity of the secondary battery after the 50 cycles were measured, and the charge-and-discharge efficiency (discharge capacity/charge capacity) was calculated. The result is shown in Table 2.
