Borderline Metal Centers on Nonporous Metal‐Organic Framework Nanowire Boost Fast Li‐Ion Interfacial Transport of Composite Polymer Electrolyte
Borderline Metal Centers on Nonporous Metal‐Organic Framework Nanowire Boost Fast Li‐Ion Interfacial Transport of Composite Polymer Electrolyte
复制标题
无孔金属上的边界金属中心有机框架纳米线促进复合聚合物电解质的快速锂离子界面传输
DOI：
10.1002/smll.202204163
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发表时间：
2022
期刊：
影响因子：
13.3
通讯作者：
Jisheng Zhou
中科院分区：
文献类型：
--
作者：
Jianqi Xu;Guixin Ma;Ning Wang;Simin Zhao;Jisheng Zhou
Metal-organic frameworks (MOFs) fillers are emerging for composite polymer electrolytes (CPEs). Enhancing Lewis acid-base interaction (LABI) among MOFs, polymer and Li-salt is expected to promote Li+ -transport. However, it is unclear how to customize a strong LABI interface. The large surface-area of classical MOFs also interferes with clarifying the LABI influence on Li+ -transport. Herein, Bi3+ as metal centers to design colloidal-dispersed nonporous MOFs (Bi/HMT-MOFs) nanowire with a surface-area of only 17.13 m2 g-1 to prepare polyethylene oxide (PEO)-based CPEs (BMCPE) is chosen. The nonporous feature can exclude the surface-area effect on Li+ -transport. More interestingly, Bi3+ is a typical borderline acid, which can interact with both hard-basic PEO and soft-basic Li-salt anion. Accordingly, Bi/HMT-MOFs are uniformly dispersed in the BMCPE to form a strong LABI interface with PEO and Li-salt, promoting Li-salt dissociation and providing rapid Li+ -transport channels. Despite the ultralow surface-area of Bi/HMT-MOFs, BMCPE exhibits significantly enhanced ion-conductivity and Li+ transference number, which completely rival traditional MOFs-filled CPEs. BMCPE also enables symmetric and full cells with excellent high-rate performance and long-term cycling stability. In contrast, when Bi3+ sites are obscured, electrochemical performances are obviously decreased. Therefore, employing borderline metal centers will be an effective strategy to construct a LABI interface for high-performance MOFs-filled CPEs.
