The development of high-energy-density Li-ion batteries is hindered by the irreversible capacity loss during the initial charge-discharge process.Therefore,pre-lithiation technology has emerged in the past few decades...The development of high-energy-density Li-ion batteries is hindered by the irreversible capacity loss during the initial charge-discharge process.Therefore,pre-lithiation technology has emerged in the past few decades as a powerful method to supplement the undesired lithium loss,thereby maximizing the energy utilization of LIBs and extending their cycle life.Lithium oxalate(Li_(2)C_(2)O_(4)),with a high lithium content and excellent air stability,has been considered one of the most promising materials for lithium compensation.However,the sluggish electrochemical decomposition kinetics of the material severely hinders its further commercial application.Here,we introduce a recrystallization strategy combined with atomic Ni catalysts to modulate the mass transport and decomposition reaction kinetics.The decomposition potential of Li_(2)C_(2)O_(4)is significantly decreased from~4.90V to~4.30V with a high compatibility with the current battery systems.In compared to the bare NCM//Li cell,the Ni/N-rGO and Li_(2)C_(2)O_(4)composite(Ni-LCO)modified cell releases an extra capacity of~11.7%.Moreover,this ratio can be magnified in the NCM//SiOx full cell,resulting in a 30.4%higher reversible capacity.Overall,this work brings the catalytic paradigm into the pre-lithiation technology,which opens another window for the development of high-energy-density battery systems.展开更多
Compound [Co 3(BTC)(HBTC)(H 2BTC)(C 2H 4O 2) 3]·3(DMF)·6(H 3O) was synthesized under mild conditions and its crystal structure was determined by using single crystal X-ray diffraction. The crystal structure ...Compound [Co 3(BTC)(HBTC)(H 2BTC)(C 2H 4O 2) 3]·3(DMF)·6(H 3O) was synthesized under mild conditions and its crystal structure was determined by using single crystal X-ray diffraction. The crystal structure was solved by direct method and refined by full-matrix least-square method. The crystal is monoclinic and belongs to space group Cc with a=2.645 3(5) nm, b= 1.670 4(3) nm, c=1\^821 6(4) nm, β=128.16(3) °, V=6.329(2) nm 3, Z=2 , D c=20.200 Mg/m 3, M r= 1 314.744, μ=10.274 mm -1, F(000) =38 226, GOF=0.99, R=0.094 1, ωR=0.257 3.展开更多
Grafting dodecyl in EDTA,A ligand-N,N′-di ( dodecyl ) disodium ethylenediamine di-acetic acid was synthesized and its complex C 30 H 58 O 4N 2Cu ( Ⅱ ) was obtained in chloroformme∶thanol=1∶1( V/V ).The products we...Grafting dodecyl in EDTA,A ligand-N,N′-di ( dodecyl ) disodium ethylenediamine di-acetic acid was synthesized and its complex C 30 H 58 O 4N 2Cu ( Ⅱ ) was obtained in chloroformme∶thanol=1∶1( V/V ).The products were characterized by IR?EA? 1HNMR and UV spectra.展开更多
基金supported by National Natural Science Foundation of China(Grant No.52002094)Guangdong Basic and Applied Basic Research Foundation(Grant No.2019A1515110756)+2 种基金Shenzhen Science and Technology Program(Grant No.JCYJ20210324121411031,JSGG202108021253804014,RCBS20210706092218040)the Shenzhen Steady Support Plan(GXWD20221030205923001,GXWD20201230155427003-20200824103000001)School Research Startup Expenses of Harbin Institute of Technology(Shenzhen)(Grant No.DD29100027,DD45001022).
文摘The development of high-energy-density Li-ion batteries is hindered by the irreversible capacity loss during the initial charge-discharge process.Therefore,pre-lithiation technology has emerged in the past few decades as a powerful method to supplement the undesired lithium loss,thereby maximizing the energy utilization of LIBs and extending their cycle life.Lithium oxalate(Li_(2)C_(2)O_(4)),with a high lithium content and excellent air stability,has been considered one of the most promising materials for lithium compensation.However,the sluggish electrochemical decomposition kinetics of the material severely hinders its further commercial application.Here,we introduce a recrystallization strategy combined with atomic Ni catalysts to modulate the mass transport and decomposition reaction kinetics.The decomposition potential of Li_(2)C_(2)O_(4)is significantly decreased from~4.90V to~4.30V with a high compatibility with the current battery systems.In compared to the bare NCM//Li cell,the Ni/N-rGO and Li_(2)C_(2)O_(4)composite(Ni-LCO)modified cell releases an extra capacity of~11.7%.Moreover,this ratio can be magnified in the NCM//SiOx full cell,resulting in a 30.4%higher reversible capacity.Overall,this work brings the catalytic paradigm into the pre-lithiation technology,which opens another window for the development of high-energy-density battery systems.
文摘Compound [Co 3(BTC)(HBTC)(H 2BTC)(C 2H 4O 2) 3]·3(DMF)·6(H 3O) was synthesized under mild conditions and its crystal structure was determined by using single crystal X-ray diffraction. The crystal structure was solved by direct method and refined by full-matrix least-square method. The crystal is monoclinic and belongs to space group Cc with a=2.645 3(5) nm, b= 1.670 4(3) nm, c=1\^821 6(4) nm, β=128.16(3) °, V=6.329(2) nm 3, Z=2 , D c=20.200 Mg/m 3, M r= 1 314.744, μ=10.274 mm -1, F(000) =38 226, GOF=0.99, R=0.094 1, ωR=0.257 3.
文摘Grafting dodecyl in EDTA,A ligand-N,N′-di ( dodecyl ) disodium ethylenediamine di-acetic acid was synthesized and its complex C 30 H 58 O 4N 2Cu ( Ⅱ ) was obtained in chloroformme∶thanol=1∶1( V/V ).The products were characterized by IR?EA? 1HNMR and UV spectra.
