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Outline
Regarding the problem of thermal runaway in automotive lithium-ion batteries, in this paper the experiments were performed based on 1 Ah soft pack batteries, Adiabatic Accelerating Rate Calorimetry (ARC) and lateral heating experiments. The thermal runaway behavior and changing process of silicon-based negative batteries with different SiOx mass fractions (0%, 5%, 10%, 15%) was researched. It is studied that the influence of silicon content on the characteristic temperature of thermal runaway and the battery voltage, as well as the changing characteristics of flame jetting during thermal runaway. The quantitative relation between silicon content-SEI stability-thermal runaway was established. The results show that the thermal stability index (temperature threshold) T1 of the SEI film gradually decreases with the increase of SiOx, and the triggering temperature T2 of thermal runaway increases, and the highest temperature T3 gets to 30.3% (when the SiOx content is 15%). At the same time, comparing with lithium-ion batteries made of graphite materials, the unit heat release increases by 42.3%. In the lateral heating experiment, the highest temperature of battery thermal runaway gets to 1 003.5 ℃ (when the SiOx content is 15%), and the flame jetting is more intense and the duration is shorter (10 s).
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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