The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength,ionic conductivity,and thickness.Here,we propose Al_(2)O_(3)-coated polyimide(AO/PI)porous film as ...The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength,ionic conductivity,and thickness.Here,we propose Al_(2)O_(3)-coated polyimide(AO/PI)porous film as a high-strength substrate to support fast-ion-conducting polymer-in-salt(PIS)solid-state electrolytes,aiming to suppress lithium dendrite growth and improve full-cell performance.The Al_(2)O_(3)coating layer not only refines the wettability of polyimide porous film to PIS,but also performs as a high modulus protective layer to suppress the growth of lithium dendrites.The resulting PI/AO@PIS exhibits a small thickness of only 35μm with an outstanding tensile strength of 11.3 MPa and Young's modulus of 537.6 MPa.In addition,the PI/AO@PIS delivers a high ionic conductivity of 0.1 m S/cm at 25°C.As a result,the PI/AO@PIS enables symmetric Li cells to achieve exceptional cyclability for over 1000 h at 0.1 m A/cm2without noticeable lithium dendrite formation.Moreover,the PI/AO@PIS-based LiFePO4||Li full cells demonstrate outstanding rate performance(125.7 m Ah/g at 5 C)and impressive cycling stability(96.1%capacity retention at 1 C after 200 cycles).This work highlights the efficacy of enhancing the mechanical properties of polymer matrices and extending cell performance through the incorporation of a dense inorganic interface layer.展开更多
采用Ag Cu Ti钎料实现了Al_2O_3陶瓷与Fe-Co-Ni合金的钎焊连接,并调查了不同钛含量的钎料对Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头机械性能和微观组织结构的影响。利用扫描电镜(SEM),X射线能量谱仪(EDS),X射线衍射仪(XRD)及电子万能试验机...采用Ag Cu Ti钎料实现了Al_2O_3陶瓷与Fe-Co-Ni合金的钎焊连接,并调查了不同钛含量的钎料对Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头机械性能和微观组织结构的影响。利用扫描电镜(SEM),X射线能量谱仪(EDS),X射线衍射仪(XRD)及电子万能试验机研究了钎焊接头的力学性能和微观组织结构。结果表明,钛含量的增加明显提高Ag-Cu-Ti钎料与Al_2O_3陶瓷的相互作用,在Al_2O_3/Ag-Cu-Ti界面生成一层由Ti-Al和Ti-O化合物组成的反应层。Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头的抗拉强度随钛含量的增加而增加,当钛含量提高到8%(质量分数)时,抗拉强度达到最大值78 MPa。通过微观组织结构分析发现,采用AgCu4Ti在890℃保温5 min的条件下可以获得较好的钎焊接头,典型接头的微观组织结构为Al_2O_3/TiAl+Ti_3O_5/NiTi+Cu_3Ti+Ag(s,s)/Ag(s,s)+Cu(s,s)+(Cu,Ni)/Fe-Ni-Co。采用Ag-Cu-8Ti获得的钎焊接头的界面反应层与Ag-Cu-4Ti差异不大,但反应层稍微增厚,并伴有TiO和Ti_3Al在Al_2O_3/Ag-Cu-Ti界面生成。展开更多
基金the financial support from the 261Project of MIIT and Natural Science Foundation of Jiangsu Province(No.BK20240179)。
文摘The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength,ionic conductivity,and thickness.Here,we propose Al_(2)O_(3)-coated polyimide(AO/PI)porous film as a high-strength substrate to support fast-ion-conducting polymer-in-salt(PIS)solid-state electrolytes,aiming to suppress lithium dendrite growth and improve full-cell performance.The Al_(2)O_(3)coating layer not only refines the wettability of polyimide porous film to PIS,but also performs as a high modulus protective layer to suppress the growth of lithium dendrites.The resulting PI/AO@PIS exhibits a small thickness of only 35μm with an outstanding tensile strength of 11.3 MPa and Young's modulus of 537.6 MPa.In addition,the PI/AO@PIS delivers a high ionic conductivity of 0.1 m S/cm at 25°C.As a result,the PI/AO@PIS enables symmetric Li cells to achieve exceptional cyclability for over 1000 h at 0.1 m A/cm2without noticeable lithium dendrite formation.Moreover,the PI/AO@PIS-based LiFePO4||Li full cells demonstrate outstanding rate performance(125.7 m Ah/g at 5 C)and impressive cycling stability(96.1%capacity retention at 1 C after 200 cycles).This work highlights the efficacy of enhancing the mechanical properties of polymer matrices and extending cell performance through the incorporation of a dense inorganic interface layer.
文摘采用Ag Cu Ti钎料实现了Al_2O_3陶瓷与Fe-Co-Ni合金的钎焊连接,并调查了不同钛含量的钎料对Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头机械性能和微观组织结构的影响。利用扫描电镜(SEM),X射线能量谱仪(EDS),X射线衍射仪(XRD)及电子万能试验机研究了钎焊接头的力学性能和微观组织结构。结果表明,钛含量的增加明显提高Ag-Cu-Ti钎料与Al_2O_3陶瓷的相互作用,在Al_2O_3/Ag-Cu-Ti界面生成一层由Ti-Al和Ti-O化合物组成的反应层。Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头的抗拉强度随钛含量的增加而增加,当钛含量提高到8%(质量分数)时,抗拉强度达到最大值78 MPa。通过微观组织结构分析发现,采用AgCu4Ti在890℃保温5 min的条件下可以获得较好的钎焊接头,典型接头的微观组织结构为Al_2O_3/TiAl+Ti_3O_5/NiTi+Cu_3Ti+Ag(s,s)/Ag(s,s)+Cu(s,s)+(Cu,Ni)/Fe-Ni-Co。采用Ag-Cu-8Ti获得的钎焊接头的界面反应层与Ag-Cu-4Ti差异不大,但反应层稍微增厚,并伴有TiO和Ti_3Al在Al_2O_3/Ag-Cu-Ti界面生成。
