Clarification of the dispersion mechanism of three typical chemical dispersants in lithium-ion battery (LIB) slurry

This paper mainly clarified the dispersion mechanism of three typical chemical dispersants which are polyethylene glycol octylphenyl ether(Triton X-100,T-100),polyethylene pyrrolidone(PVP)and carboxymethyl cellulose(CMC)within lithium-ion battery(LIB)slurry.Initially,the optimum amounts of T-100,PVP and CMC are selected from 0%,0.5%,1.5%and 2.5%by evaluating the impedance of LIB slurry in the case of adding each typical chemical dispersant with EIS method.Moreover,the impedance spectrum of three different slurry samples which are PVDF-NMP solution,LiCoO_(2) slurry and Carbon Black(CB)slurry with the optimum amount of each dispersant are also investigated.After using SEM and C element distribution images of LIB slurry to verify the correctness of the dispersion mechanism of each dispersant,it is concluded that the dispersion CMC with its optimum amount 1.5%is the best one to promote the formation of conductive paths and CB-coated LiCoO_(2) network structure within LIB slurry,which has the considerably potential to improve the performance of LIB.

Effect of subsea dispersant application on deepwater oil spill in the South China Sea

There are considerable amounts of off shore oil/gas fields in the South China Sea(SCS),and for potential oil spill events in this area,dispersants may provide a reliable large-scale response when the preferable option of recapturing the oil cannot be achieved.In this paper,effect of chemical dispersants on underwater oil transport is investigated with an underwater oil spill model.Since the model is an adaption of an existing one,we first calibrate it by comparing the model result with echo-sounder data that were observed during the“DeepSpill”experiment with crude oil/LNG(liquefied natural gas)discharge.Then,with the hydrodynamic data provided by an operational forecasting system and the drilling data obtained from off shore platforms in the SCS,we apply the model to a hypothetical spill case,and examine the difference in oil distribution in water column caused by subsea dispersant application.The model results can provide valuable reference for contingency plan makers to make an efficient emergency response to potential underwater oil spill accidents in the SCS.

Chemical signals coordinate the dispersal of a plant-parasitic nematode with the metamorphosis of its vector beetle

With the support by the National Natural Science Foundation of China and the Chinese Academy of Sciences,Prof.Sun Jianghua(孙江华),Zou Zhen and Zhao Lilin et al.at the State Key Laboratory of Integrated Management of Pest Insects and Rodents,Institute of Zoology,Chinese Academy of Sciences,uncovered that ascarosides coordinate the dispersal of a plant-parasitic nematode with the metamorphosis