Carbon films prepared from pyrolyzation of spin-casted polyacrylonitrile （PAN） thin films display high electrical conductivity （〉600 S/cm, at 1000 ℃ carbonization）, low sheet resistance （about 100 Y2/square at ...Carbon films prepared from pyrolyzation of spin-casted polyacrylonitrile （PAN） thin films display high electrical conductivity （〉600 S/cm, at 1000 ℃ carbonization）, low sheet resistance （about 100 Y2/square at the PAN film thickness of 70 nm） and partial transmittance. These pyrolyzed PAN （PPAN） films were patterned as bottom electrodes by photolithography, and utilized as drain and source electrodes to fabricate organic field-effect transistor （OFET） devices with a p-type semiconductor （P3HT） and an n-type semiconductor （DPP-containing quinoidal small molecule） through a spin-coating procedure. The results showed that the devices with the PAN electrodes exhibited almost the same excellent performance without any further modification compared to those devices with traditional Au electrodes. Since these PPAN films had the advantages of low-cost, high performance, easier for large-area fabrication, thermal and chemical stability, it should be a promising electrode material for organic electrodes.展开更多
The practical application of high-energy lithium–sulfur battery is plagued with two deadly obstacles.One is the“shuttle effect”originated from the sulfur cathode,and the other is the low Coulombic efficiency and se...The practical application of high-energy lithium–sulfur battery is plagued with two deadly obstacles.One is the“shuttle effect”originated from the sulfur cathode,and the other is the low Coulombic efficiency and security issues arising from the lithium metal anode.In addressing these issues,we propose a novel silicon-sulfurized poly(acrylonitrile)full battery.In this lithium metal-free system,the Li source is pre-loaded in the cathode,using a nitrogen evolution reaction(NER)to implant Li+into the silicon/carbon anode.Sulfurized poly(acrylonitrile)based on a solid–solid conversion mechanism can fundamentally circumvent the“shuttle effect”.Meanwhile,the silicon/carbon anode can achieve more efficient utiliza-tion and higher security when compared with the Li metal anode.The full cell used in this technology can deliver a capacity of 1169.3 mAh g^(-1),and it can be stabilized over 100 cycles,implying its excellent elec-trochemical stability.Furthermore,the practical pouch cell with a high sulfur loading of 4.2 mg cm^(-2)can achieve a high specific energy of 513.2 Wh kg-1.The mechanism of the NER in cathode has also been investigated and analyzed by in situ methods.Notably,this battery design completely conforms to the current battery production technology because of the degassing of gasbag,resulting in a low manufactur-ing cost.This work will open the avenue to develop a lithium metal-free battery using the NER.展开更多
基金supported by the Chinese Ministryof Science and Technology (2013CB632506, 2011CB932304)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB12000000)the National Natural Science Foundation of China(21290191, 21333011)
文摘Carbon films prepared from pyrolyzation of spin-casted polyacrylonitrile （PAN） thin films display high electrical conductivity （〉600 S/cm, at 1000 ℃ carbonization）, low sheet resistance （about 100 Y2/square at the PAN film thickness of 70 nm） and partial transmittance. These pyrolyzed PAN （PPAN） films were patterned as bottom electrodes by photolithography, and utilized as drain and source electrodes to fabricate organic field-effect transistor （OFET） devices with a p-type semiconductor （P3HT） and an n-type semiconductor （DPP-containing quinoidal small molecule） through a spin-coating procedure. The results showed that the devices with the PAN electrodes exhibited almost the same excellent performance without any further modification compared to those devices with traditional Au electrodes. Since these PPAN films had the advantages of low-cost, high performance, easier for large-area fabrication, thermal and chemical stability, it should be a promising electrode material for organic electrodes.
基金the National Natural Science Foundation of China(21922508,21673116,21633003,and U1801251)Natural Science Foundation of Jiangsu Province of China(BK20190009)and Key R&D Project funded by Department of Science and Technology of Jiangsu Province(BE2020003)。
文摘The practical application of high-energy lithium–sulfur battery is plagued with two deadly obstacles.One is the“shuttle effect”originated from the sulfur cathode,and the other is the low Coulombic efficiency and security issues arising from the lithium metal anode.In addressing these issues,we propose a novel silicon-sulfurized poly(acrylonitrile)full battery.In this lithium metal-free system,the Li source is pre-loaded in the cathode,using a nitrogen evolution reaction(NER)to implant Li+into the silicon/carbon anode.Sulfurized poly(acrylonitrile)based on a solid–solid conversion mechanism can fundamentally circumvent the“shuttle effect”.Meanwhile,the silicon/carbon anode can achieve more efficient utiliza-tion and higher security when compared with the Li metal anode.The full cell used in this technology can deliver a capacity of 1169.3 mAh g^(-1),and it can be stabilized over 100 cycles,implying its excellent elec-trochemical stability.Furthermore,the practical pouch cell with a high sulfur loading of 4.2 mg cm^(-2)can achieve a high specific energy of 513.2 Wh kg-1.The mechanism of the NER in cathode has also been investigated and analyzed by in situ methods.Notably,this battery design completely conforms to the current battery production technology because of the degassing of gasbag,resulting in a low manufactur-ing cost.This work will open the avenue to develop a lithium metal-free battery using the NER.
