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首页> 外文期刊>International Journal of Electrochemical Science >Thermo-Electrochemical Study on the Heat Effects of LiFePO4 Lithium-ion Battery During Charge-Discharge Process
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Thermo-Electrochemical Study on the Heat Effects of LiFePO4 Lithium-ion Battery During Charge-Discharge Process

机译：LiFePO 4 锂离子电池充放电过程中热效应的热电化学研究

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摘要

The heat effects of lithium-ion battery cathode could substantially affect the safety and attenuatelifetime of lithium-ion battery. In order to disclose the thermo-electrochemical behaviors of LiFePO4battery during charge-discharge process at various rates at 30 electrochemical-calorimetricmeasurements were employed in this study. The results showed that LiFePO4 battery had a smallerpolarization and a better reversibility at low rate (0.1C, 0.2C, 0.5C). With the increasing of the ratestructure of cathode material LiFePO4 was partially destroyed and impurities, like Li3PO4 and FeP2,appeared at rate 1.0C and 2.0C. Formation of these impurities resulted in electrochemical performancedeterioration of battery. The charge-discharge process of LiFePO4 battery accompanied exothermicprocess and endothermic process at low rate (0.1C, 0.2C). When the rate increased to 1.0C, onlyexothermic phenomena existed. With the rate increasing heat production rate and the enthalpy changeduring charge-discharge process of LiFePO4 battery increased. These suggest that appropriate rate forbattery should be choose in order to avoid safety problem, which initiated by internal heataccumulation of battery.
机译：锂离子电池正极的热效应会严重影响锂离子电池的安全性并缩短其使用寿命。为了揭示LiFePO4电池在30电化学量热法下以各种速率充放电过程中的热电化学行为。结果表明，LiFePO4电池在低倍率（0.1C，0.2C，0.5C）下具有较小的极化和较好的可逆性。随着正极材料速率结构的增加，LiFePO4被部分破坏，杂质如Li3PO4和FeP2以1.0C和2.0C的速率出现。这些杂质的形成导致电池的电化学性能劣化。 LiFePO4电池的充放电过程伴随着放热过程和吸热过程，速率较低（0.1C，0.2C）。当速率增加到1.0C时，仅存在放热现象。随着速率的增加，LiFePO4电池的产热率和焓变充放电过程增加。这些建议应选择合适的电池速率以避免电池内部热量积聚引发的安全问题。

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