Li/garnet/LiFePO_(4) solid-state battery was fabricated.The cathode contains LiFePO_(4),Ketjen black,poly(vinylidene fluoride):LiTFSI polymer as active material,electric conductor and Li-ion conducting binder,respecti...Li/garnet/LiFePO_(4) solid-state battery was fabricated.The cathode contains LiFePO_(4),Ketjen black,poly(vinylidene fluoride):LiTFSI polymer as active material,electric conductor and Li-ion conducting binder,respectively.Polyvinylpyrrolidone was added into the cathode to improve cathode/electrolyte interfacial performance.When combined with polyvinylpyrrolidone additive,poly(vinylidene fluoride):polyvinylpyrrol idone:LiTFSI blend forms,and the cathode/electrolyte interfacial resistance reduces from 10.7 kΩto 3.2 kΩ.The Li/garnet/LiFePO_(4) solid-state battery shows 80%capacity retention after 100 cycles at 30℃and 0.05 C.This study offers a general strategy to improve cathode/electrolyte interfacial performance and may enable the practical application of solid-state Li-metal batteries.展开更多
Carbon materials are the preferred anode materials for Li-ion batteries.Here,we propose an easy and sustainable strategy to prepare honeycomb-shaped porous carbon(HPC)electrode materials through a process involving si...Carbon materials are the preferred anode materials for Li-ion batteries.Here,we propose an easy and sustainable strategy to prepare honeycomb-shaped porous carbon(HPC)electrode materials through a process involving simple calcination and subsequent water washing by using polyvinyl-pyrrolidone(PVP)as carbon source and NaCl as pore-forming agent.A controllable cavity size and distribution of the carbon materials can be readily obtained solely by adjusting the NaCl amount.Results showed that the optimized HPC sample had a relatively uniform cavity distribution and a highly porous structure.Moreover,the special honeycomb-shaped structure was conducive to the electronic conductivity of the electrode materials,provided a short path for Li-ion transport and a wide interface with the electrolyte,and buffered the volume change of active materials.The special honeycomb-shaped structure was also maintained well after long cycles,which improved electrode stability.When used as anode materials for Li-ion batteries(LIBs),the sample demonstrated excellent cycling stability and rate performance,with a high specific capacity of 230 mA hg^-1 and a reversible capacity of 197 mA hg^-1,after 1200 cycles at 2 C.Overall,we introduced a simple strategy for the potential mass production of porous carbon materials for LIBs.展开更多
基金Funded by the National Natural Science Foundation of China(Nos.51772314,51532002,51771222 and 51702346)the Natural Science Foundation of Shanghai City(17ZR1434600)。
文摘Li/garnet/LiFePO_(4) solid-state battery was fabricated.The cathode contains LiFePO_(4),Ketjen black,poly(vinylidene fluoride):LiTFSI polymer as active material,electric conductor and Li-ion conducting binder,respectively.Polyvinylpyrrolidone was added into the cathode to improve cathode/electrolyte interfacial performance.When combined with polyvinylpyrrolidone additive,poly(vinylidene fluoride):polyvinylpyrrol idone:LiTFSI blend forms,and the cathode/electrolyte interfacial resistance reduces from 10.7 kΩto 3.2 kΩ.The Li/garnet/LiFePO_(4) solid-state battery shows 80%capacity retention after 100 cycles at 30℃and 0.05 C.This study offers a general strategy to improve cathode/electrolyte interfacial performance and may enable the practical application of solid-state Li-metal batteries.
基金the National Natural Science Foundation of China(Grant Nos.51662029 and 21363015)the Graduate Innovation Fund Projects of Jiangxi Province(Grant No.YC2018-S013)。
文摘Carbon materials are the preferred anode materials for Li-ion batteries.Here,we propose an easy and sustainable strategy to prepare honeycomb-shaped porous carbon(HPC)electrode materials through a process involving simple calcination and subsequent water washing by using polyvinyl-pyrrolidone(PVP)as carbon source and NaCl as pore-forming agent.A controllable cavity size and distribution of the carbon materials can be readily obtained solely by adjusting the NaCl amount.Results showed that the optimized HPC sample had a relatively uniform cavity distribution and a highly porous structure.Moreover,the special honeycomb-shaped structure was conducive to the electronic conductivity of the electrode materials,provided a short path for Li-ion transport and a wide interface with the electrolyte,and buffered the volume change of active materials.The special honeycomb-shaped structure was also maintained well after long cycles,which improved electrode stability.When used as anode materials for Li-ion batteries(LIBs),the sample demonstrated excellent cycling stability and rate performance,with a high specific capacity of 230 mA hg^-1 and a reversible capacity of 197 mA hg^-1,after 1200 cycles at 2 C.Overall,we introduced a simple strategy for the potential mass production of porous carbon materials for LIBs.
