钠离子和锂离子电池老化及产热特性对比OA

Understanding the characteristics of sodium-ion batteries is crucial for thermal management and safety control of the battery.Different types of sodium-ion batteries and Li-ion batteries are selected as research subjects to systematically compare the two battery systems in terms of capacity retention,cycling degradation and heat generation characteristics under various operating conditions.Under low-temperature conditions,sodium-ion batteries exhibit higher capacity ratio to that at 25 ℃.At 0 ℃,all three sodium-ion batteries retain approximately 95％,while at-15 ℃,the two batteries with relatively lower capacities maintain about 88％.The ratios are higher than those of Li-ion batteries under the same conditions.During cycling,sodium-ion batteries exhibit more rapid capacity fade and greater increase in internal resistance,while Li-ion batteries exhibit a slow overall variation.Surface temperature tests show that battery heating increases notably with the increase of temperature and rate.At 30 ℃ and 2.00 C,the 1.3 Ah sodium-ion battery rises by 9.2 ℃,compared to 5.4 ℃ at 30 ℃ and 1.00 C.Compared to Li-ion batteries,sodium-ion batteries exhibit larger temperature rise fluctuations,which tends to increase with capacity.