Physical models of ion diffusion at different interfaces are reviewed. The use of impedance spectroscopy （IS）, nuclear magnetic resonance （NMR）, and secondary ion mass spectrometry （SIMS） techniques are also dis...Physical models of ion diffusion at different interfaces are reviewed. The use of impedance spectroscopy （IS）, nuclear magnetic resonance （NMR）, and secondary ion mass spectrometry （SIMS） techniques are also discussed. The diffusion of ions is fundamental to the operation of lithium-ion batteries, taking place not only within the grains but also across different interfaces. Interfacial ion transport usually contributes to the majority of the resistance in lithium-ion batteries. A greater understanding of the interfacial diffusion of ions is crucial to improving battery performance.展开更多
Three new transition metal tricyanomethanide complexes [Co（dpdo）（tcm）2] （1）, [Cu（dpdo）（tcm）2] （2） and Cu（dpdo）2（tcm）2 （3） were synthesized and structurally characterized. In compound 1 each Co（II） ...Three new transition metal tricyanomethanide complexes [Co（dpdo）（tcm）2] （1）, [Cu（dpdo）（tcm）2] （2） and Cu（dpdo）2（tcm）2 （3） were synthesized and structurally characterized. In compound 1 each Co（II） ion is coordinated to four disorder tcm anions and one dpdo molecule to give a distorted octahedral geometry. In compound 2 each Cu（II） ion is surrounded by four tcm anions and one dpdo ligand to form a square bipyramidal geometry. Both compounds 1 and 2 display a μ1,5-tcm bridged infinite chain structure. Interestingly, in compound 3 coordination geometry around the central ion is square-planar, each Cu（II） ion is coordinated by two dpdo molecules to form a cationic part, the cationic parts is linked with the free tcm anionic parts via electrostatic attraction, leading to the formation of a mononuclear structure. Magnetic susceptibility measurement in the range 2--300 K indicates that there are antiferromagnetic couplings between adjacent metal ions in 1 （0=--2.33 K, C=2.13 cm3-mol 1oK） and 2 （J= --0.30, g = 2.20） respectively.展开更多
基金supported by the Beijing S&T Project,China(Grant No.Z13111000340000)the National Natural Science Foundation of China(Grant Nos.51325206and 11234013)the National Basic Research Program of China(Grant No.2012CB932900)
文摘Physical models of ion diffusion at different interfaces are reviewed. The use of impedance spectroscopy （IS）, nuclear magnetic resonance （NMR）, and secondary ion mass spectrometry （SIMS） techniques are also discussed. The diffusion of ions is fundamental to the operation of lithium-ion batteries, taking place not only within the grains but also across different interfaces. Interfacial ion transport usually contributes to the majority of the resistance in lithium-ion batteries. A greater understanding of the interfacial diffusion of ions is crucial to improving battery performance.
基金Project supported by the National Natural Science Foundation of China （No. 20571086）.
文摘Three new transition metal tricyanomethanide complexes [Co（dpdo）（tcm）2] （1）, [Cu（dpdo）（tcm）2] （2） and Cu（dpdo）2（tcm）2 （3） were synthesized and structurally characterized. In compound 1 each Co（II） ion is coordinated to four disorder tcm anions and one dpdo molecule to give a distorted octahedral geometry. In compound 2 each Cu（II） ion is surrounded by four tcm anions and one dpdo ligand to form a square bipyramidal geometry. Both compounds 1 and 2 display a μ1,5-tcm bridged infinite chain structure. Interestingly, in compound 3 coordination geometry around the central ion is square-planar, each Cu（II） ion is coordinated by two dpdo molecules to form a cationic part, the cationic parts is linked with the free tcm anionic parts via electrostatic attraction, leading to the formation of a mononuclear structure. Magnetic susceptibility measurement in the range 2--300 K indicates that there are antiferromagnetic couplings between adjacent metal ions in 1 （0=--2.33 K, C=2.13 cm3-mol 1oK） and 2 （J= --0.30, g = 2.20） respectively.
