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Lithium-ion batteries science and technologies ÀïÓÐÕâÑùÒ»¶ÎÃèÊö£¬Ó¦¸ÃºÍÄãÍÆ²âµÄÔÒòÏà·û As the performance of Li + -ion batteries at elevated temperatures (50¨C70¡ãC) 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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nidan10
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