The Na_(4)MnCr(PO_(4))_(3)material is a representative NASICON-type polyanion compound,distinguished by its open three-dimensional framework,high operating voltage,and exceptionally high theoretical energy density.How...The Na_(4)MnCr(PO_(4))_(3)material is a representative NASICON-type polyanion compound,distinguished by its open three-dimensional framework,high operating voltage,and exceptionally high theoretical energy density.However,the failure mechanism associated with phase structure distortions in Na_(4)MnCr(PO_(4))_(3)during the electrochemical reaction process remains unclear.In this study,we introduce the concept of a"current-responsive transition state"(CRTS)for the first time to elucidate the unique oxidation peaks that arise between Mn^(2+)/Mn^(3+)and Mn^(3+)/Mn^(4+)at elevated potential states in Na_(4)MnCr(PO_(4))_(3)materials.The formation of Mn(PO_(3))_(3)during the electrochemical process is accompanied by an overresponse of CRTS and severe lattice distortion,which impedes the diffusion kinetics and leads to a significant reduction in the reversible platform capacity of Mn^(2+)/Mn^(3+).The introduction of a trace amount of V can effectively inhibit the formation of Mn(PO_(3))_(3),while optimizing the CRTS phenomenon,thereby enhancing the reversible platform capacity of Mn.Optimizing CRTS enables Na_(4)MnCr(PO_(4))_(3)to exhibit excellent rate performance(97.5 mAh g^(-1)at 1 C)and cycling stability(81.4%capacity retention after 500 cycles at 5 C).Furthermore,the NMCV_(50)P||HC full cell exhibits remarkable electrochemical performance,achieving a capacity of 73.5 mAh g^(-1)at 100 mA g^(-1)and demonstrating an impressive capacity retention of 94.7%after 200 cycles.This research offers valuable insights for the optimization of Mn-based polyanion materials.展开更多
This paper presents a comprehensive survey on the development of Intel SGX(software guard extensions)processors and its applications.With the advent of SGX in 2013 and its subsequent development,the corresponding rese...This paper presents a comprehensive survey on the development of Intel SGX(software guard extensions)processors and its applications.With the advent of SGX in 2013 and its subsequent development,the corresponding research works are also increasing rapidly.In order to get a more comprehensive literature review related to SGX,we have made a systematic analysis of the related papers in this area.We first search through five large-scale paper retrieval libraries by keywords(i.e.,ACM Digital Library,IEEE/IET Electronic Library,SpringerLink,Web of Science,and Elsevier Science Direct).We read and analyze a total of 128 SGX-related papers.The first round of extensive study is conducted to classify them.The second round of intensive study is carried out to complete a comprehensive analysis of the paper from various aspects.We start with the working environment of SGX and make a conclusive summary of trusted execution environment(TEE).We then focus on the applications of SGX.We also review and study multifarious attack methods to SGX framework and some recent security improvements made on SGX.Finally,we summarize the advantages and disadvantages of SGX with some future research opportunities.We hope this review could help the existing and future research works on SGX and its application for both developers and users.展开更多
基金National Natural Science Foundation of China(5247433152574355)Gusu Leading Talents of Innovation and Entrepreneurship(ZXL2023196)。
文摘The Na_(4)MnCr(PO_(4))_(3)material is a representative NASICON-type polyanion compound,distinguished by its open three-dimensional framework,high operating voltage,and exceptionally high theoretical energy density.However,the failure mechanism associated with phase structure distortions in Na_(4)MnCr(PO_(4))_(3)during the electrochemical reaction process remains unclear.In this study,we introduce the concept of a"current-responsive transition state"(CRTS)for the first time to elucidate the unique oxidation peaks that arise between Mn^(2+)/Mn^(3+)and Mn^(3+)/Mn^(4+)at elevated potential states in Na_(4)MnCr(PO_(4))_(3)materials.The formation of Mn(PO_(3))_(3)during the electrochemical process is accompanied by an overresponse of CRTS and severe lattice distortion,which impedes the diffusion kinetics and leads to a significant reduction in the reversible platform capacity of Mn^(2+)/Mn^(3+).The introduction of a trace amount of V can effectively inhibit the formation of Mn(PO_(3))_(3),while optimizing the CRTS phenomenon,thereby enhancing the reversible platform capacity of Mn.Optimizing CRTS enables Na_(4)MnCr(PO_(4))_(3)to exhibit excellent rate performance(97.5 mAh g^(-1)at 1 C)and cycling stability(81.4%capacity retention after 500 cycles at 5 C).Furthermore,the NMCV_(50)P||HC full cell exhibits remarkable electrochemical performance,achieving a capacity of 73.5 mAh g^(-1)at 100 mA g^(-1)and demonstrating an impressive capacity retention of 94.7%after 200 cycles.This research offers valuable insights for the optimization of Mn-based polyanion materials.
基金supported by Fund of Shaanxi Science and Technology Research and Development Plan Project(2015GY073)Shaanxi Key Research and Development Program(2019GY-057).
文摘This paper presents a comprehensive survey on the development of Intel SGX(software guard extensions)processors and its applications.With the advent of SGX in 2013 and its subsequent development,the corresponding research works are also increasing rapidly.In order to get a more comprehensive literature review related to SGX,we have made a systematic analysis of the related papers in this area.We first search through five large-scale paper retrieval libraries by keywords(i.e.,ACM Digital Library,IEEE/IET Electronic Library,SpringerLink,Web of Science,and Elsevier Science Direct).We read and analyze a total of 128 SGX-related papers.The first round of extensive study is conducted to classify them.The second round of intensive study is carried out to complete a comprehensive analysis of the paper from various aspects.We start with the working environment of SGX and make a conclusive summary of trusted execution environment(TEE).We then focus on the applications of SGX.We also review and study multifarious attack methods to SGX framework and some recent security improvements made on SGX.Finally,we summarize the advantages and disadvantages of SGX with some future research opportunities.We hope this review could help the existing and future research works on SGX and its application for both developers and users.
