UiO-66 type metal-organic framework as a multifunctional additive to enhance the interfacial stabili

• 作 者: Ruixue Xue Na Liu Liying Bao Lai Chen Yuefeng Su Yun Lu Jinyang Dong Shi Chen Feng Wu
• 机 构: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Eng
• 出 处: 能源化学
• 发表日期: 2020年11期
• 关键词: Ni-rich layered cathode Metal-organic framework additive Electrolyte corrosion T

To effectively alleviate the surface structure degradation caused by electrolyte corrosion and transition metal (TM) dissolution for Ni-rich (Ni content ＞ 0.6) cathode materials,porous Zirconium based metalorganic frameworks (Zr-MOFs,UiO-66) material is utilized herein as a positive electrode additive.UiO-66 owns tunable attachment sites and strong binding affinity,making itself an efficient defluorination agent to suppress the undesirable reactions caused by fluorine species.Besides,it can also relieve TMs dissolution and block the migration of TMs toward anode side since it's a multifarious metal ions adsorbent,realizing both cathode and anode interface protection.Benefiting from these advantages,the UiO-66 assistant Ni-rich cathode achieves superior cycling stability.Particularly in full cell,the positive effects of this multifunctional additive are more pronounced than in the half-cell,that is after 400 cycles at 2 C,the capacity retention has doubled with the addition of UiO-66.More broadly,this unique application of functional additive provides new insight into the degradation mechanism of layered cathode materials and offers a new avenue to develop high-energy density batteries.