Free-standing Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)/MWCNT(LLO/MWCNT)framework electrodes have been successfully fabricated for high energy density lithium-ion batteries.By constructing a 3D conductive network,the L...Free-standing Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)/MWCNT(LLO/MWCNT)framework electrodes have been successfully fabricated for high energy density lithium-ion batteries.By constructing a 3D conductive network,the LLO/MWCNT cells exhibit superior electrochemical performances.Specifically,LLO/MWCNT cells achieve a high initial discharge capacity of 318.2 mA h g^(-1)at 0.1 C(1 C=250 mA g^(-1))with a coulombic efficiency of 91.1%.After 200 cycles at 1 C,LLo/MWCNT cells can still deliver 209.2 mA h g^(-1),corresponding to a capacity retention of 95.9%.Furthermore,LLO/MWCNT electrodes can still deliver a high discharge capacity of 121.6 mA h g^(-1)after 500 cycles at 10 C.Compared with conventional electrodes,the free-standing LLO/MWCNT electrodes can yield up to 47%reduction in the total weight and the active materials of LLO/MWCNT electrodes have been raised 2 times.By combining the high capacity Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)cathodes and the superiority of the free-standing structure,the energy density of lithium-ion batteries can be highly enhanced and this design holds great potential to be used with future electronic devices.展开更多
This article systematically reviews the significant progress China has made in the field of air pollution health risk assessment since 2013,including the establishment of the national monitoring network,the improvemen...This article systematically reviews the significant progress China has made in the field of air pollution health risk assessment since 2013,including the establishment of the national monitoring network,the improvement of relevant laws and formulation of technical guidelines.The paper focuses on an in-depth discussion of the current core challenges:the disconnection between health risk and decisionmaking,the lack of a multi-sectoral coordination mechanism,the imperfection of the technical system(particularly for mixed exposures and emerging pollutants),and the novel risks posed by global climate change.Based on this analysis,we prospectively propose fundamental pathways to advance the field:1)constructing a robust management mechanism and coordination framework;2)promoting the integration of the full environmental health risk assessment process into the decision-making pipeline(an“assessmentmanagement interaction”paradigm);and 3)strengthening interdisciplinary collaboration and leveraging innovative technologies to refine the technical assessment system.展开更多
基金National Nature Science Foundation of China(grant no.21601148)Natural Science Foundation of Fujian Province(grant no.2017J05090)。
文摘Free-standing Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)/MWCNT(LLO/MWCNT)framework electrodes have been successfully fabricated for high energy density lithium-ion batteries.By constructing a 3D conductive network,the LLO/MWCNT cells exhibit superior electrochemical performances.Specifically,LLO/MWCNT cells achieve a high initial discharge capacity of 318.2 mA h g^(-1)at 0.1 C(1 C=250 mA g^(-1))with a coulombic efficiency of 91.1%.After 200 cycles at 1 C,LLo/MWCNT cells can still deliver 209.2 mA h g^(-1),corresponding to a capacity retention of 95.9%.Furthermore,LLO/MWCNT electrodes can still deliver a high discharge capacity of 121.6 mA h g^(-1)after 500 cycles at 10 C.Compared with conventional electrodes,the free-standing LLO/MWCNT electrodes can yield up to 47%reduction in the total weight and the active materials of LLO/MWCNT electrodes have been raised 2 times.By combining the high capacity Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)cathodes and the superiority of the free-standing structure,the energy density of lithium-ion batteries can be highly enhanced and this design holds great potential to be used with future electronic devices.
基金Supported by the commissioned project of the Department of Health and Immunization Planning under the National Disease Control and Prevention Administration(No.BX2024100800015).
文摘This article systematically reviews the significant progress China has made in the field of air pollution health risk assessment since 2013,including the establishment of the national monitoring network,the improvement of relevant laws and formulation of technical guidelines.The paper focuses on an in-depth discussion of the current core challenges:the disconnection between health risk and decisionmaking,the lack of a multi-sectoral coordination mechanism,the imperfection of the technical system(particularly for mixed exposures and emerging pollutants),and the novel risks posed by global climate change.Based on this analysis,we prospectively propose fundamental pathways to advance the field:1)constructing a robust management mechanism and coordination framework;2)promoting the integration of the full environmental health risk assessment process into the decision-making pipeline(an“assessmentmanagement interaction”paradigm);and 3)strengthening interdisciplinary collaboration and leveraging innovative technologies to refine the technical assessment system.
