Conducting polymer is an eccentric polymer having flexibility, high electric conductivity, and easiness to synthesis. Through these advantages, conducting polymer has widely range of use: supercapacitors, batteries, electrochromic devices, solar cells, sensors, and biomedical applications.
Lith...
Conducting polymer is an eccentric polymer having flexibility, high electric conductivity, and easiness to synthesis. Through these advantages, conducting polymer has widely range of use: supercapacitors, batteries, electrochromic devices, solar cells, sensors, and biomedical applications.
Lithium-ion batteries (LIBs) are considered as a good candidate for energy applications because of their response time, high cycle efficiencies, and so on. To make high capacity batteries, developing anode material is an inevitable work. Above all, silicon-based anode materials are rising stars for their high capacity, abundance in earth crust, and eco-friendly. However, severe critical issues like volume expansion remain.
In this paper, we studied on 2D Si flake@PPy synthesized by vapor phase polymerization and 2D Si flake@SO3 doped PANI to refine the problem of Si anode. In the case of 2D Si flake@PPy, initial coulombic efficiency (ICE) was 85%, because, overoxidation occurs during synthesis. On the other hand, in the case of SO3 doped polyaniline (PANI), it shows 98.4%, 13.4% higher than PPy coated Si. 2D Si flake @ PPy and 2D Si flake @ SO3 doped PANI were synthesized to improve the disadvantages of Si anode. 2D Si flake @ PPy adopted vapor phase polymerization to simplify the coating method, but, it was hard to gain uniformly coated sample, and overoxidation reaction occurs through the reac tion. Spring from overoxidation reaction, it increased Li+intercalation but deintercalation didn’t keep up with the amount of intercalated Li+.
Overoxidation led the drop of the initial coulombic efficiency. On the other hand, 2D Si flake @ SO3 doped PANI displayed uniformly coated Si anode and prevented overoxidation through dissolving and reconstructionin NMP solution. Moreover, 2D Si flake @ SO3 doped PANI exhibited high initial coulombic efficiency, good cycling performance, and suppressed expansion.
Conducting polymer is an eccentric polymer having flexibility, high electric conductivity, and easiness to synthesis. Through these advantages, conducting polymer has widely range of use: supercapacitors, batteries, electrochromic devices, solar cells, sensors, and biomedical applications.
Lithium-ion batteries (LIBs) are considered as a good candidate for energy applications because of their response time, high cycle efficiencies, and so on. To make high capacity batteries, developing anode material is an inevitable work. Above all, silicon-based anode materials are rising stars for their high capacity, abundance in earth crust, and eco-friendly. However, severe critical issues like volume expansion remain.
In this paper, we studied on 2D Si flake@PPy synthesized by vapor phase polymerization and 2D Si flake@SO3 doped PANI to refine the problem of Si anode. In the case of 2D Si flake@PPy, initial coulombic efficiency (ICE) was 85%, because, overoxidation occurs during synthesis. On the other hand, in the case of SO3 doped polyaniline (PANI), it shows 98.4%, 13.4% higher than PPy coated Si. 2D Si flake @ PPy and 2D Si flake @ SO3 doped PANI were synthesized to improve the disadvantages of Si anode. 2D Si flake @ PPy adopted vapor phase polymerization to simplify the coating method, but, it was hard to gain uniformly coated sample, and overoxidation reaction occurs through the reac tion. Spring from overoxidation reaction, it increased Li+intercalation but deintercalation didn’t keep up with the amount of intercalated Li+.
Overoxidation led the drop of the initial coulombic efficiency. On the other hand, 2D Si flake @ SO3 doped PANI displayed uniformly coated Si anode and prevented overoxidation through dissolving and reconstructionin NMP solution. Moreover, 2D Si flake @ SO3 doped PANI exhibited high initial coulombic efficiency, good cycling performance, and suppressed expansion.
주제어
#Lithium-ion batteries anode materials silicon anode silicon core-shell structures conducting polymers
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