Conversion-type fluoride cathode can provide considerable energy density for Li batteries,however its scalable and facile synthesis strategies are still lacking.Here,a novel Fe-based deep eutectic solvent composed of ...Conversion-type fluoride cathode can provide considerable energy density for Li batteries,however its scalable and facile synthesis strategies are still lacking.Here,a novel Fe-based deep eutectic solvent composed of nitrite and methylsulfonylmethane is proposed as both the reaction medium and precursor to synthesize O-doped FeF3porous bricks.This method is cheaper,safe,mildly operable,environmentally friendly and recyclable for non-fluorinated metal cations.The homogenization of charge and mass transport in cathode network effectively mitigates the volume extrusion and electrode coarsening even for the micro-sized monolithic particles.The Co-solvation modulated fluoride cathode delivers high reversible capacity in a wide temperature range(486 and 235 mA h g^(-1)at 25℃ and-20℃ respectively),excellent rate performance(312 mA h g^(-1)at 1000 mA g^(-1)),corresponding to an energy density as high as672.1 W h kg^(-1)under a power density of 2154.3 W kg^(-1).The successful operation of fluoride pouchcell with a capacity exceeding 450 mA h g^(-1)(even under thin Li foil and lean electrolyte conditions) indicates its potentiality of commercial application.展开更多
Using the deep eutectic solvent formed of oxalic acid and choline chloride, a new charge-assisted hydrogen-bonded host framework [Co（en）312[Zr2（C2O4）7]·2H2O （1） has been obtained. The title complex crystall...Using the deep eutectic solvent formed of oxalic acid and choline chloride, a new charge-assisted hydrogen-bonded host framework [Co（en）312[Zr2（C2O4）7]·2H2O （1） has been obtained. The title complex crystallizes in the monoclinic, space group P21/n （No. 14） with a = 7.7448（10）, b = 14.5683（19）, c = 19.375（3） A, fl = 92.124（2）°, V= 2184.5（5） A3, Z = 4, Dc = 1.996 gcm-3, F（000） = 1332, μ = 1.328 mm＂1, R = 0.0353 and wR = 0.0718 （1 〉 2α（I））. Single-crystal structure analysis reveals that the title complex possesses a 3D network assembled through a multitude of charge-assisted hydrogen bonds between the in situ generated anionic coordination complexes [Zr2（C204）7]6- and metal complexes Co（en）33＋.展开更多
基金supported by the National Natural Science Foundation of China(51772313,21975276 and 52102329)the Shanghai Science and Technology Committee(20520710800)support by the Program of Shanghai Academic Research Leader(21XD1424400)。
文摘Conversion-type fluoride cathode can provide considerable energy density for Li batteries,however its scalable and facile synthesis strategies are still lacking.Here,a novel Fe-based deep eutectic solvent composed of nitrite and methylsulfonylmethane is proposed as both the reaction medium and precursor to synthesize O-doped FeF3porous bricks.This method is cheaper,safe,mildly operable,environmentally friendly and recyclable for non-fluorinated metal cations.The homogenization of charge and mass transport in cathode network effectively mitigates the volume extrusion and electrode coarsening even for the micro-sized monolithic particles.The Co-solvation modulated fluoride cathode delivers high reversible capacity in a wide temperature range(486 and 235 mA h g^(-1)at 25℃ and-20℃ respectively),excellent rate performance(312 mA h g^(-1)at 1000 mA g^(-1)),corresponding to an energy density as high as672.1 W h kg^(-1)under a power density of 2154.3 W kg^(-1).The successful operation of fluoride pouchcell with a capacity exceeding 450 mA h g^(-1)(even under thin Li foil and lean electrolyte conditions) indicates its potentiality of commercial application.
基金supported by the National Natural Science Foundation of China(Nos.21301024,21103017)the Fundamental Research Funds for the Central Universities(N120305003)
文摘Using the deep eutectic solvent formed of oxalic acid and choline chloride, a new charge-assisted hydrogen-bonded host framework [Co（en）312[Zr2（C2O4）7]·2H2O （1） has been obtained. The title complex crystallizes in the monoclinic, space group P21/n （No. 14） with a = 7.7448（10）, b = 14.5683（19）, c = 19.375（3） A, fl = 92.124（2）°, V= 2184.5（5） A3, Z = 4, Dc = 1.996 gcm-3, F（000） = 1332, μ = 1.328 mm＂1, R = 0.0353 and wR = 0.0718 （1 〉 2α（I））. Single-crystal structure analysis reveals that the title complex possesses a 3D network assembled through a multitude of charge-assisted hydrogen bonds between the in situ generated anionic coordination complexes [Zr2（C204）7]6- and metal complexes Co（en）33＋.
