Firstly,the current situation of China’s current marine science and technology talent ecological chain was analyzed,and then the problems in talent training were discussed.Finally,countermeasures to improve the talen...Firstly,the current situation of China’s current marine science and technology talent ecological chain was analyzed,and then the problems in talent training were discussed.Finally,countermeasures to improve the talent ecological chain were proposed.展开更多
The current situation of China’s marine logistics talents was studied firstly,and then problems in China’s marine logistics talent training were analyzed.Finally,some countermeasures for optimizing the training of m...The current situation of China’s marine logistics talents was studied firstly,and then problems in China’s marine logistics talent training were analyzed.Finally,some countermeasures for optimizing the training of marine logistics talents were proposed according to the problems.展开更多
The present situation of China s marine talent ecosphere was studied firstly,and then problems in China s marine talent ecosphere were analyzed.Finally,some countermeasures for the construction of China s marine talen...The present situation of China s marine talent ecosphere was studied firstly,and then problems in China s marine talent ecosphere were analyzed.Finally,some countermeasures for the construction of China s marine talent ecosphere were put forward.展开更多
Silicon,due to its high theoretical capacity and abundant resources,has emerged as a potential anode material for lithium-ion batteries(LIBs).However,it suffers from intrinsic capacity decay and rapid degradation,coup...Silicon,due to its high theoretical capacity and abundant resources,has emerged as a potential anode material for lithium-ion batteries(LIBs).However,it suffers from intrinsic capacity decay and rapid degradation,coupled with huge volume expansion that leads to unstable growth of solid electrolyte interface(SEI).Here,we present a straightforward method to construct yolk-shell(YS)-Si/SiO_(2)-Ti@C materials with YS structure by reducing titanium silicalite-1(TS-1)with magnesium and altering depositing carbon sequence.Besides,the intermediate space can effectively accommodate the expansion of internal silicon nanoparticles.TiO_(2) structural units anchored in the silica alleviate stress-strain in the Si nanoparticles to enhance the cycling stability.The obtained YS-Si/SiO_(2)-Ti@C composites anode exhibits exceptional reversible capacity and cycling stability compared to YS-Si/SiO_(2)@C(without TiO_(2))and commercial Si electrodes.Notably,the YS-Si/SiO_(2)-Ti@C composite anode achieves a high specific capacity(1290 mAh·g^(-1) after 200 cycles at 0.8 A·g^(-1))and a stable SEI film.Specially,the YS-Si/SiO_(2)-Ti@C electrode delivers impressive capacity of 1590,1521,1222,and 646 mAh·g^(-1) at 0.8,2,4,and 8 A·g^(-1),respectively.This study paves an avenue for addressing challenge of drastic volume change in silicon during lithiation/delithiation process to improve cycling stability of LIBs.展开更多
基金Supported by Foundation for Humanities and Social Sciences Research Planning of Ministry of Education of China in 2019(19YJA630058)。
文摘Firstly,the current situation of China’s current marine science and technology talent ecological chain was analyzed,and then the problems in talent training were discussed.Finally,countermeasures to improve the talent ecological chain were proposed.
基金Supported by Foundation for Humanities and Social Sciences Research Planning of Ministry of Education of China in 2019(19YJA630058)。
文摘The current situation of China’s marine logistics talents was studied firstly,and then problems in China’s marine logistics talent training were analyzed.Finally,some countermeasures for optimizing the training of marine logistics talents were proposed according to the problems.
基金Supported by Foundation for Humanities and Social Sciences Research Planning of Ministry of Education of China in 2019(19YJA630058).
文摘The present situation of China s marine talent ecosphere was studied firstly,and then problems in China s marine talent ecosphere were analyzed.Finally,some countermeasures for the construction of China s marine talent ecosphere were put forward.
基金supported by the National Natural Science Foundation of China(Nos.22371154,U23A20552,52472217,and 52272222)the 111 Project of China(No.D20017)+1 种基金Shandong Province Double-Hundred Talent Plan(No.WST2020003)State Key Laboratory of Heavy Oil Processing(No.SKLHOP202202006).
文摘Silicon,due to its high theoretical capacity and abundant resources,has emerged as a potential anode material for lithium-ion batteries(LIBs).However,it suffers from intrinsic capacity decay and rapid degradation,coupled with huge volume expansion that leads to unstable growth of solid electrolyte interface(SEI).Here,we present a straightforward method to construct yolk-shell(YS)-Si/SiO_(2)-Ti@C materials with YS structure by reducing titanium silicalite-1(TS-1)with magnesium and altering depositing carbon sequence.Besides,the intermediate space can effectively accommodate the expansion of internal silicon nanoparticles.TiO_(2) structural units anchored in the silica alleviate stress-strain in the Si nanoparticles to enhance the cycling stability.The obtained YS-Si/SiO_(2)-Ti@C composites anode exhibits exceptional reversible capacity and cycling stability compared to YS-Si/SiO_(2)@C(without TiO_(2))and commercial Si electrodes.Notably,the YS-Si/SiO_(2)-Ti@C composite anode achieves a high specific capacity(1290 mAh·g^(-1) after 200 cycles at 0.8 A·g^(-1))and a stable SEI film.Specially,the YS-Si/SiO_(2)-Ti@C electrode delivers impressive capacity of 1590,1521,1222,and 646 mAh·g^(-1) at 0.8,2,4,and 8 A·g^(-1),respectively.This study paves an avenue for addressing challenge of drastic volume change in silicon during lithiation/delithiation process to improve cycling stability of LIBs.
