A high-performance quasi-solid polymer electrolyte for sodium metal batteries(SMBs)based on in-situ polymerized poly(1,3-dioxolane)(DOL)with 20%volume ratio of fluoroethylene carbonate(FEC),termed"PDFE-20",i...A high-performance quasi-solid polymer electrolyte for sodium metal batteries(SMBs)based on in-situ polymerized poly(1,3-dioxolane)(DOL)with 20%volume ratio of fluoroethylene carbonate(FEC),termed"PDFE-20",is proposed in this work.It is demonstrated PDFE-20 possesses a room-temperature ionic conductivity of 3.31×10^(-3) S cm^(-1),an ionic diffusion activation energy of 0.10 eV,and an oxidation potential of 4.4 V.SMBs based on PDFE-20 and Na_(3)V_(2)(PO_(4))_(3)(NVP)cathodes were evaluated with an active material mass loading of 6.8 mg cm^(-2).The cell displayed an initial discharge specific capacity of 104 mA h g^(-1),and97.1%capacity retention after 100 cycles at 0.5 C.In-situ polymerization conformally coats the anode/-cathode interfaces,avoiding geometrical gaps and high charge transfer resistance with ex-situ polymerization of the same chemistry.FEC acts as a plasticizer during polymerization to suppress crystallization and significantly improves ionic transport.During battery cycling FEC promotes mechanical congruence of electrolyte-electrode interfaces while forming a stable NaF-rich solid electrolyte interphase(SEI)at the anode.Density functional theory(DFT)calculations were also performed to further understand the role FEC in the poly(DOL)-FEC electrolytes.This work broadens the application of in-situ prepared poly(DOL)electrolytes to sodium storage and demonstrates the crucial role of FEC in improving the electrochemical performance.展开更多
随着中小企业(Small and Midium-sized Business,SMB)接入交换机市场规模的扩大,行业标准接入交换机已难以满足客户对低价格、高质量、高易用性的要求。本文根据运用场景制定质量策略,通过电路重构、设计精简、去除过设计和功能重定义...随着中小企业(Small and Midium-sized Business,SMB)接入交换机市场规模的扩大,行业标准接入交换机已难以满足客户对低价格、高质量、高易用性的要求。本文根据运用场景制定质量策略,通过电路重构、设计精简、去除过设计和功能重定义等方法降低成本,通过产品使用旅程挖掘易用性痛点,完成了对SMB接入交换机的质量提高、成本降低和易用性改善的目标,在高质量、高易用的前提下实现了低价格。展开更多
基金financially supported by the National Natural Science Foundation of China(Grant Nos.52072105 and 21676067)the Key R&D Program of Anhui Province(202104a05020044)+3 种基金the Anhui Provincial Natural Science Foundation(2108085J23)the Major Science and Technology Projects in Anhui Province(202003a05020014,2021e03020001)the Fundamental Research Funds for the Central Universities(PA2021KCPY0028,JZ2022HGTB0251)supported by the National Science Foundation,Division of Materials Research,Award Number 1938833。
文摘A high-performance quasi-solid polymer electrolyte for sodium metal batteries(SMBs)based on in-situ polymerized poly(1,3-dioxolane)(DOL)with 20%volume ratio of fluoroethylene carbonate(FEC),termed"PDFE-20",is proposed in this work.It is demonstrated PDFE-20 possesses a room-temperature ionic conductivity of 3.31×10^(-3) S cm^(-1),an ionic diffusion activation energy of 0.10 eV,and an oxidation potential of 4.4 V.SMBs based on PDFE-20 and Na_(3)V_(2)(PO_(4))_(3)(NVP)cathodes were evaluated with an active material mass loading of 6.8 mg cm^(-2).The cell displayed an initial discharge specific capacity of 104 mA h g^(-1),and97.1%capacity retention after 100 cycles at 0.5 C.In-situ polymerization conformally coats the anode/-cathode interfaces,avoiding geometrical gaps and high charge transfer resistance with ex-situ polymerization of the same chemistry.FEC acts as a plasticizer during polymerization to suppress crystallization and significantly improves ionic transport.During battery cycling FEC promotes mechanical congruence of electrolyte-electrode interfaces while forming a stable NaF-rich solid electrolyte interphase(SEI)at the anode.Density functional theory(DFT)calculations were also performed to further understand the role FEC in the poly(DOL)-FEC electrolytes.This work broadens the application of in-situ prepared poly(DOL)electrolytes to sodium storage and demonstrates the crucial role of FEC in improving the electrochemical performance.
文摘随着中小企业(Small and Midium-sized Business,SMB)接入交换机市场规模的扩大,行业标准接入交换机已难以满足客户对低价格、高质量、高易用性的要求。本文根据运用场景制定质量策略,通过电路重构、设计精简、去除过设计和功能重定义等方法降低成本,通过产品使用旅程挖掘易用性痛点,完成了对SMB接入交换机的质量提高、成本降低和易用性改善的目标,在高质量、高易用的前提下实现了低价格。
