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- Title
Long-Term Stable Cycling of Dendrite-Free Lithium Metal Batteries Using ZIF-90@PP Composite Separator.
- Authors
LYU, Shuilan; Zhang, Xin; Huang, Sheng; Wang, Shuanjin; Xiao, Min; Han, Dongmei; Meng, Yuezhong
- Abstract
Lithium metal batteries (LMBs) are anticipated to meet the demand for high energy density, but the growth of lithium dendrites seriously hinders its practical application. Herein, we constructed a kind of composite separator (ZIF-90@PP) consisting of zeolite imidazole framework-90 (ZIF-90) and polypropylene (PP) to promote the uniform deposition of Li+ and inhibit the growth of lithium dendrites. The aldehyde groups interacting with TFSI− and the nitrogen-containing negative groups attracting Li+ of ZIF-90 can facilitate the dissociation of LiTFSI to release more Li+, thus alleviating the influence of space charge near the electrode surface and accelerating the transfer of Li+. Not only does the excellent electrolyte wettability of ZIF-90 enhance the electrolyte retention capacity of the separator, but the orderly nano-channels in ZIF-90 also restrict the free migration of anions and homogenize the distribution of Li+. Consequently, the functional separator achieves a long-term stable Li plating/stripping cycling for over 780 h at 2 mA cm−2. Moreover, an impressive average coulombic efficiency of 98.67% at 0.5 C after 300 cycles is realized by Li || LFP full cells based on ZIF-90@PP with a capacity retention rate of 71.22%. The high-rate and long cycling performance of the modified Li || LFP cells further demonstrates the advantages of the ZIF-90@PP composite separator.
- Subjects
LITHIUM cells; SPACE charge; DENDRITIC crystals; ENERGY density; LITHIUM; ALUMINUM-lithium alloys; CYCLING competitions; ENERGY consumption
- Publication
Nanomaterials (2079-4991), 2024, Vol 14, Issue 11, p975
- ISSN
2079-4991
- Publication type
Academic Journal
- DOI
10.3390/nano14110975