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[求助]
軟包鋰離子電池:高電壓下高溫夾具baking-對鋰電池材料的影響?
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目前做軟包電池會進行高溫下夾具baking,具體就是用大的壓力對電池進行高溫定型。壓強大約在1.1-1.3MPa,溫度是85℃,4-6h左右。電壓在4.1V-4.3V。 在壓后,電池的容量會降低1.5%。正極為純鈷酸鋰-4.35V材料,負極為人造石墨。電解液為LiF6,溶劑EMC-DEC-EC 添加劑FEC VEC PS. 隔膜是單層PE。 對于baking后的容量降低,現(xiàn)在的推測是在高溫下SEI膜分解,部分鋰組成新的SEI膜,可用鋰減少,電池容量降低。 不知道各位對于在baking時正負極材料的變化還有什么見解? |
金蟲 (著名寫手)
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Lithium-ion batteries science and technologies 里有這樣一段描述,應該和你推測的原因相符 As the performance of Li + -ion batteries at elevated temperatures (50–70°C) is relevant to their safe utilizations, studies on SEI film properties at elevated tempera- tures have been pursued recently. It was found that metastable species like ROCO 2 Li within the SEI layer will decompose into more stable products such as LiC 2 O 3 and LiF at elevated temperatures. This leaves more pores in SEI layer and exposes the graphite-lithium surface to electrolytes, causing more irreversible capacities during continuous cycling. Actually, some companies have used the “aging” process to construct stable SEI film on electrodes for Li + -ion batteries, which is based on the above phenomenon. After fabrication, the Li + -ion batteries were charged and stored at elevated temperature for certain times before sale in markets. Thus the SEI film is composed mainly of stable species like LiC 2 O 3 and LiF and prove to be robust and effective for passivating the carbon electrodes. |
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