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nidan10

金虫 (正式写手)

[求助] 软包锂离子电池:高电压下高温夹具baking-对锂电池材料的影响?

目前做软包电池会进行高温下夹具baking,具体就是用大的压力对电池进行高温定型。压强大约在1.1-1.3MPa,温度是85℃,4-6h左右。电压在4.1V-4.3V。
在压后,电池的容量会降低1.5%。正极为纯钴酸锂-4.35V材料,负极为人造石墨。电解液为LiF6,溶剂EMC-DEC-EC 添加剂FEC VEC PS. 隔膜是单层PE。
对于baking后的容量降低,现在的推测是在高温下SEI膜分解,部分锂组成新的SEI膜,可用锂减少,电池容量降低。
不知道各位对于在baking时正负极材料的变化还有什么见解?
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sofc

木虫 (正式写手)

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引用回帖:
4楼: Originally posted by 19880416 at 2013-07-31 15:52:43
Lithium-ion batteries science and technologies 里有这样一段描述,应该和你推测的原因相符

As the performance of Li +
-ion batteries at elevated temperatures (50–70°C) is
relevant to their safe u ...

兄弟,我正好想了解和学习这方面的内容。你能告诉我这篇文献的信息吗?我想下载来看。谢谢!
8楼2015-10-23 17:05:26
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zhenren1980

金虫 (著名写手)

【答案】应助回帖

感谢参与,应助指数 +1
为什么要高电压4.1-4.3V呢? 半电(3.8-3.9V)情况下,容量会不会损失小点呢
2楼2013-07-31 11:19:04
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nidan10

金虫 (正式写手)

引用回帖:
2楼: Originally posted by zhenren1980 at 2013-07-31 11:19:04
为什么要高电压4.1-4.3V呢? 半电(3.8-3.9V)情况下,容量会不会损失小点呢

高电压下可以更好的给电池定型,低电压下确实容损会少。
3楼2013-07-31 13:01:19
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19880416

银虫 (小有名气)

【答案】应助回帖

★ ★ ★ ★ ★
感谢参与,应助指数 +1
nidan10: 金币+5, ★★★很有帮助, 谢谢,又多了解了一些SEI膜的知识。 2013-08-01 11:27:54
Lithium-ion batteries science and technologies 里有这样一段描述,应该和你推测的原因相符

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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4楼2013-07-31 15:52:43
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