The kaolinite-polyacrylamide inte rcalation compound was prepared fir st by the displacement reaction of th e kaolinite-formamide intercalatio n precursor with 30%acrylamide ethanol solution,and then the polymeriz ati...The kaolinite-polyacrylamide inte rcalation compound was prepared fir st by the displacement reaction of th e kaolinite-formamide intercalatio n precursor with 30%acrylamide ethanol solution,and then the polymeriz ation under 140℃for 15h with the catalysis of dibenzoyl peroxide.The XRD analy ses showed that the basal spacings of kaolinite-acrylamide intercalation compound and kaolinite-polyacry lamide compound were 1.135nm and 1.144nm respectively.The kaolinite-polya crylamide compound was able to resis t to 30-min washing with water,but th e kaolinite-acrylamide compound was unstable during washing.FT-IR proved that the hydrogen bonds were forme d between kaolinite Si-O group and polyacrylamide NH group and between kaolinite inner surface hydroxyl and polyacrylamide C =O group,and that p arts of NH group keyed into the kaolin ite ditrigonal hole.TG and DTG analysis proved that kaolinite-polyacrylamide was stable under 350℃.A net weight loss of 16.63%between 370℃～500℃is due to the removal of interca lated polyacrylamide from the interlamellar space of kaolinite.These results clearly indicate that acrylamide has been intercalated into the layers of kaolinite and was polymerized in-situ.Based on the TG data,the formula of the kaolinite-polyacrylami de intercalation compound,Al 2 Si 2 O 5 (OH) 4 CH 2 CHCONH 2 0.736 ,can be calculated.展开更多
The structure evolution of fluorinated graphite （CFx） upon the Li/Na intercalation has been studied by first- principles calculations. The Li/Na adsorption on single CF layer and intercalated into bulk CF have been ...The structure evolution of fluorinated graphite （CFx） upon the Li/Na intercalation has been studied by first- principles calculations. The Li/Na adsorption on single CF layer and intercalated into bulk CF have been calculated. The better cycling performance of Na intercalation into the CF cathode, comparing to that of Li intercalation, is attributed to the different strength and characteristics of the Li-F and Na-F interactions. The interactions between Li and F are stronger and more localized than those between Na and E The strong and localized Coulomb attraction between Li and F atoms breaks the C-F bonds and pulls the F atoms away, and graphene sheets are formed upon Li intercalation.展开更多
The communication reports an exploratory experimental study on the effects of nitrogen annealing on lithium ion intercalation in nickel-doped lithium trivana- date cathodic electrodes for lithium ion batteries. It sho...The communication reports an exploratory experimental study on the effects of nitrogen annealing on lithium ion intercalation in nickel-doped lithium trivana- date cathodic electrodes for lithium ion batteries. It shows good rate performance with discharge capacities of 348.6, 252.6, 191.9 and 96.7 mAh g-1 at 0.2, 0.5, 1 and 5 C, respectively. Nitrogen annealing resulted in the formation of parasitic secondary-phase LiVzO5 and appreciably increased tetravalent vanadium ions compensated with oxygen vacancies, which would enhance the electronic conductivity and lithium ion diffusivity and promote the interface interaction and deintercalation process, and thus lead to the enhanced lithium ion intercalation properties. The possible impacts of the parasitic secondary-phase LiV205 on the lithium ion intercalation performance have also been discussed.展开更多
With montmorillonite (MMT) organically modified as organophilic-MMT (OMMT) and water-soluble phenol formaldehyde resin (PF) as intermediate, the nanocomposites of Chinese fir (Cunninghamialanceolata) wood and MMT, i.e...With montmorillonite (MMT) organically modified as organophilic-MMT (OMMT) and water-soluble phenol formaldehyde resin (PF) as intermediate, the nanocomposites of Chinese fir (Cunninghamialanceolata) wood and MMT, i.e. WMNC, were prepared via nano intercalation compounding, some propertiesof WMNC were analyzed. Results show that, compared with Chinese fir wood and its PF-impreg, WMNChas lower humidity and water absorption, better dimension stability, higher longitudinal compressive strength,abrasive resistance, fire-resistance, and water-leaching resistance with a very low mass ratio about 3% ofMMT. The nano intercalation compounding of wood and exfoliated MMT nanolamellae is very promising.More studies should be carried out to fully reveal the nanosize effects and the special properties of WMNC.展开更多
文摘The kaolinite-polyacrylamide inte rcalation compound was prepared fir st by the displacement reaction of th e kaolinite-formamide intercalatio n precursor with 30%acrylamide ethanol solution,and then the polymeriz ation under 140℃for 15h with the catalysis of dibenzoyl peroxide.The XRD analy ses showed that the basal spacings of kaolinite-acrylamide intercalation compound and kaolinite-polyacry lamide compound were 1.135nm and 1.144nm respectively.The kaolinite-polya crylamide compound was able to resis t to 30-min washing with water,but th e kaolinite-acrylamide compound was unstable during washing.FT-IR proved that the hydrogen bonds were forme d between kaolinite Si-O group and polyacrylamide NH group and between kaolinite inner surface hydroxyl and polyacrylamide C =O group,and that p arts of NH group keyed into the kaolin ite ditrigonal hole.TG and DTG analysis proved that kaolinite-polyacrylamide was stable under 350℃.A net weight loss of 16.63%between 370℃～500℃is due to the removal of interca lated polyacrylamide from the interlamellar space of kaolinite.These results clearly indicate that acrylamide has been intercalated into the layers of kaolinite and was polymerized in-situ.Based on the TG data,the formula of the kaolinite-polyacrylami de intercalation compound,Al 2 Si 2 O 5 (OH) 4 CH 2 CHCONH 2 0.736 ,can be calculated.
基金support of National High Technology Research and Development Program of China ("863" Program) (2015AA034201)the National Natural Science Foundation of China (11234013 and 11264014)+1 种基金Natural Science Foundation of Jiangxi Province (20133ACB21010, 20142BAB212002,20132BAB212005)Foundation of Jiangxi Education Committee (GJJ14254 and KJLD14024)
文摘The structure evolution of fluorinated graphite （CFx） upon the Li/Na intercalation has been studied by first- principles calculations. The Li/Na adsorption on single CF layer and intercalated into bulk CF have been calculated. The better cycling performance of Na intercalation into the CF cathode, comparing to that of Li intercalation, is attributed to the different strength and characteristics of the Li-F and Na-F interactions. The interactions between Li and F are stronger and more localized than those between Na and E The strong and localized Coulomb attraction between Li and F atoms breaks the C-F bonds and pulls the F atoms away, and graphene sheets are formed upon Li intercalation.
基金supported by the‘‘Thousands Talents’’Program for a pioneer researcher and his innovative teamChina+5 种基金supported by the National Natural Science Foundation of China(51374029)the National Science Foundation(NSFDMR-1505902)Program for New Century Excellent Talents in University(NCET-13-0668)Fundamental Research Funds for the Central Universities(FRF-TP-14-008C1)China Postdoctoral Science Foundation(2015M570988)
文摘The communication reports an exploratory experimental study on the effects of nitrogen annealing on lithium ion intercalation in nickel-doped lithium trivana- date cathodic electrodes for lithium ion batteries. It shows good rate performance with discharge capacities of 348.6, 252.6, 191.9 and 96.7 mAh g-1 at 0.2, 0.5, 1 and 5 C, respectively. Nitrogen annealing resulted in the formation of parasitic secondary-phase LiVzO5 and appreciably increased tetravalent vanadium ions compensated with oxygen vacancies, which would enhance the electronic conductivity and lithium ion diffusivity and promote the interface interaction and deintercalation process, and thus lead to the enhanced lithium ion intercalation properties. The possible impacts of the parasitic secondary-phase LiV205 on the lithium ion intercalation performance have also been discussed.
基金Funded by Chinese Natural Science Fund Committee (No. 30070606).
文摘With montmorillonite (MMT) organically modified as organophilic-MMT (OMMT) and water-soluble phenol formaldehyde resin (PF) as intermediate, the nanocomposites of Chinese fir (Cunninghamialanceolata) wood and MMT, i.e. WMNC, were prepared via nano intercalation compounding, some propertiesof WMNC were analyzed. Results show that, compared with Chinese fir wood and its PF-impreg, WMNChas lower humidity and water absorption, better dimension stability, higher longitudinal compressive strength,abrasive resistance, fire-resistance, and water-leaching resistance with a very low mass ratio about 3% ofMMT. The nano intercalation compounding of wood and exfoliated MMT nanolamellae is very promising.More studies should be carried out to fully reveal the nanosize effects and the special properties of WMNC.
