Nanophase LiCoO 2 was synthesized by solid state reaction with low heating temperature, i.e. the reactants Co(Ac) 2·4H 2O and LiOH·H 2O in the appropriate molar ratio(1∶1) were mixed and ground in agate mor...Nanophase LiCoO 2 was synthesized by solid state reaction with low heating temperature, i.e. the reactants Co(Ac) 2·4H 2O and LiOH·H 2O in the appropriate molar ratio(1∶1) were mixed and ground in agate mortar, then calcined. The samples obtained were characterized by XRD and IR methods. The phenomena during synthesizing are discussed by TG/TDA analysis, and the optimum temperature of heating was chosen. The BET and ICP results suggest that the sample has a large specific surface(54.29 m 2/g), a low quantity of impurity, thus it may be a good battery material. The nanophase LiCoO 2 samples produced have good cyclic performance and a higher working voltage plateau(3.9 V).展开更多
The Fe(OH) 3 precursor was prepared by solid-state reaction with Fe(NO 3 ) 3 ·9H 2 O,NaOH and dispersed poly-ethylene glycol at low heating temperature(25℃).Synthesis of iron oxide(γ-Fe 2 O 3 )nanoparticle was ...The Fe(OH) 3 precursor was prepared by solid-state reaction with Fe(NO 3 ) 3 ·9H 2 O,NaOH and dispersed poly-ethylene glycol at low heating temperature(25℃).Synthesis of iron oxide(γ-Fe 2 O 3 )nanoparticle was achieved by thermal decomposition of Fe(OH) 3 ·xH 2 O precursor.The nanoparticle was characterized by TG-DTA,X-ray diffra-ction,TEM etc.The results showed that the nanoparticle was composed ofγ-Fe 2 O 3 and was a better absorber for electromagnetic wave within the low frequency band.展开更多
The cold-melting mechanism and the cold-dissolving-melting mechanism w ere further studied by TG/DTA and in situ micro-photographs techniques with the mixture of dimethylglyoxime and Ni(Ac)2·4H2O, and the mixture...The cold-melting mechanism and the cold-dissolving-melting mechanism w ere further studied by TG/DTA and in situ micro-photographs techniques with the mixture of dimethylglyoxime and Ni(Ac)2·4H2O, and the mixture of dimethylglyoxi me and anhydrous Ni(Ac)2 as the modeled reactive examples. The endothermic peaks on the DTA curves at about 38 ℃ revealed the formation process of the cold-mel ting layer and cold-dissolving-melting layer on the surface of reactant particle s. Further, the cold-melting state and the cold-dissolving-melting state were ob served by the micrographs. These results provided the direct evidences for the t heories of cold-melting mechanism and the cold-dissolving-melting mechanism.展开更多
文摘Nanophase LiCoO 2 was synthesized by solid state reaction with low heating temperature, i.e. the reactants Co(Ac) 2·4H 2O and LiOH·H 2O in the appropriate molar ratio(1∶1) were mixed and ground in agate mortar, then calcined. The samples obtained were characterized by XRD and IR methods. The phenomena during synthesizing are discussed by TG/TDA analysis, and the optimum temperature of heating was chosen. The BET and ICP results suggest that the sample has a large specific surface(54.29 m 2/g), a low quantity of impurity, thus it may be a good battery material. The nanophase LiCoO 2 samples produced have good cyclic performance and a higher working voltage plateau(3.9 V).
文摘The Fe(OH) 3 precursor was prepared by solid-state reaction with Fe(NO 3 ) 3 ·9H 2 O,NaOH and dispersed poly-ethylene glycol at low heating temperature(25℃).Synthesis of iron oxide(γ-Fe 2 O 3 )nanoparticle was achieved by thermal decomposition of Fe(OH) 3 ·xH 2 O precursor.The nanoparticle was characterized by TG-DTA,X-ray diffra-ction,TEM etc.The results showed that the nanoparticle was composed ofγ-Fe 2 O 3 and was a better absorber for electromagnetic wave within the low frequency band.
文摘The cold-melting mechanism and the cold-dissolving-melting mechanism w ere further studied by TG/DTA and in situ micro-photographs techniques with the mixture of dimethylglyoxime and Ni(Ac)2·4H2O, and the mixture of dimethylglyoxi me and anhydrous Ni(Ac)2 as the modeled reactive examples. The endothermic peaks on the DTA curves at about 38 ℃ revealed the formation process of the cold-mel ting layer and cold-dissolving-melting layer on the surface of reactant particle s. Further, the cold-melting state and the cold-dissolving-melting state were ob served by the micrographs. These results provided the direct evidences for the t heories of cold-melting mechanism and the cold-dissolving-melting mechanism.
