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kxch123

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2Â¥: Originally posted by kangxu at 2015-07-09 04:12:46
The situation is simple on anode: 10% is responsible for the irreversible reaction that consumes Li+, 90% is responsible for Li+ intercalation. Among the 10% irreversible, tiny amount is caused by Li ...

Thank you very much!

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3Â¥2015-07-09 17:48:20
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kangxu

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kxch123: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2015-07-09 17:48:43
kxch123: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2015-07-09 17:48:44
The situation is simple on anode: 10% is responsible for the irreversible reaction that consumes Li+, 90% is responsible for Li+ intercalation. Among the 10% irreversible, tiny amount is caused by Li+ stuck in graphite (such as defects or surface functionality reaction with Li etc), most were caused by reduction of solvents to form Li-salts, which is main ingredient of SEI.
On cathode it's more comlicated and depends on cathode material. In layer TM oxides the first cycle will experience some structural transformation (such as NCA NMC or LMR), and this process will produce excess amount of Li+ that cannot go back to cathode. Sometimes this irreversible cancels out the irreversible produced at anode side. The oxidation of eelctrolytes also happen, which does not directly consume Li+, but some of the products are solible and diffuse to anode to reduce. The net result of whether Li+ is consumed or produced deoends on many factors.
2Â¥2015-07-09 04:12:46
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