This article reviews the progress made in CO2 separation and capture research and engineering. Various technologies, such as absorption, adsorption, and membrane separation, are thoroughly discussed. New concepts such...This article reviews the progress made in CO2 separation and capture research and engineering. Various technologies, such as absorption, adsorption, and membrane separation, are thoroughly discussed. New concepts such as chemical-looping combustion and hydrate-based separation are also introduced briefly. Future directions are suggested. Sequestration methods, such as forestation, ocean fertilization and mineral carbonation techniques are also covered. Underground injection and direct ocean dump are not covered.展开更多
Nickel-rich layered oxides are attractive cathode for lithium-ion batteries(LIBs)because of the high energy density and low cost.The critical problem is capacity fading caused by the highly reactive metastable phases ...Nickel-rich layered oxides are attractive cathode for lithium-ion batteries(LIBs)because of the high energy density and low cost.The critical problem is capacity fading caused by the highly reactive metastable phases under voltages of higher than 4.15 V.Herein,we find that facile Ar/H2 plasma treating could produce oxygen vacancies that will readily transform into homogeneous spinel layer(~6 nm)on the LiNi_(0.8)CO_(0.1)Mn_(0.1)O_(2)(NCM811)surface after a few cycles of lithiation/delithiation procedure.Owing to the structural matching between spinel and layered structure,the diffusion of Li ions could remain fast upon cycling.Besides,the spinel layer is electrochemically inert,which guarantees surface stabilization and inhibits the detrimental phase transition from H2 to H3 at high voltages.Under the protection of the homogeneous spinel layer,the NCM_(811) electrode shows superior capacity retention of 91.2% after 200 cycles at the current density of 100 mA·g^(−1).This work proposes a novel strategy of surface reconstruction to stabilize nickel-rich layered oxide materials for LIBs.展开更多
文摘This article reviews the progress made in CO2 separation and capture research and engineering. Various technologies, such as absorption, adsorption, and membrane separation, are thoroughly discussed. New concepts such as chemical-looping combustion and hydrate-based separation are also introduced briefly. Future directions are suggested. Sequestration methods, such as forestation, ocean fertilization and mineral carbonation techniques are also covered. Underground injection and direct ocean dump are not covered.
基金This work was financially supported by the Basic Research Project of the Science and Technology Innovation Commission of Shenzhen(No.JCYJ20200109141640095)Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials(No.ZDSYS20200421111401738)+2 种基金the Leading Talents of Guangdong Province Program(No.2016LJ06C536)the Guangdong-Hong Kong-Macao Joint Laboratory(No.2019B121205001)the National Natural Science Foundation of China(No.21875097).
文摘Nickel-rich layered oxides are attractive cathode for lithium-ion batteries(LIBs)because of the high energy density and low cost.The critical problem is capacity fading caused by the highly reactive metastable phases under voltages of higher than 4.15 V.Herein,we find that facile Ar/H2 plasma treating could produce oxygen vacancies that will readily transform into homogeneous spinel layer(~6 nm)on the LiNi_(0.8)CO_(0.1)Mn_(0.1)O_(2)(NCM811)surface after a few cycles of lithiation/delithiation procedure.Owing to the structural matching between spinel and layered structure,the diffusion of Li ions could remain fast upon cycling.Besides,the spinel layer is electrochemically inert,which guarantees surface stabilization and inhibits the detrimental phase transition from H2 to H3 at high voltages.Under the protection of the homogeneous spinel layer,the NCM_(811) electrode shows superior capacity retention of 91.2% after 200 cycles at the current density of 100 mA·g^(−1).This work proposes a novel strategy of surface reconstruction to stabilize nickel-rich layered oxide materials for LIBs.
