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nidan10: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú, лл£¬ÓÖ¶àÁ˽âÁËһЩSEIĤµÄ֪ʶ¡£ 2013-08-01 11:27:54
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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