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ۼ : 17-07-03 09:40
[2017.06]ڹ Tattooing Dye as a Green Electrode Material for Lithium Batteries
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 ۾ :
ȸ : 325  

Tattooing Dye as a Green Electrode Material for Lithium Batteries


ڻ (ڻ ), ڹ


ڿ ִ ȫ(red-orange) lawsone (2-hydroxy-1,4-naphthoquinone) Ƭ Ȱϴ Ͽ. lawsone ϴ Ƭ 280 mAhg1 (̷ 뷮 99% ش) 644 Whkg-1 е, 0.5 C ǿ 1000 cycles ̻ , ׸ 5 C ӵ Ư ش. ̷ ٸ Ӹ ƴ϶ ȭ LiCoO2 (140 mAhg1, 520 Whkg-1) Ͽ ſ ε巯 ش. ̷ lawsone Ư 2 · ڹ迭(molecular packing) ϸ ̸ lawsone ȭȯ Ȱ pŻ ø شȭȴ. ̷ lawsone ڴ ٸ ռ ڵ鿡 ~ ̻ ̿ ̸ ݱʹ ٸ Ư Ȯ ִ. Ӹ ƴ϶ lawsone 쳪 κ ǰ Ӹ Ǻ õ Ǿ غ , ̷ ģȯ ߿ ο ִ.

We investigate lawsone (2-hydroxy-1,4-naphthoquinone), a naturally derived red-orange dye as a promising cathode material for next-generation lithium batteries. Lithium cells based on lawsone cathode displayed a high discharge capacity of 280 mAhg1 (99% theoretical capacity), a high energy density of 664 Whkg-1, and long life of 1000 cycles at 0.5 C along with good rate performance up to 5 C. These results represent significant improvements from previously reported organic cathode materials, and surpass those of conventional lithium batteries based on LiCoO2 cathodes (140 mAhg1 and 520 Whkg-1, respectively). Its success stems from the unique 2-dimensional planar packing of lawsone molecules, with maximized overlap of adjacent p orbitals for redox active sites. The result is the simultaneous enhancement of electrical and ionic conductivities that are an order of magnitude higher than those of other synthetic quinones. Given that lawsone is derived from the henna plant and has long been used as a dye for human hair and skin, this work may open a new chapter in the design of future green batteries.


 
 

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