Journal
NANO LETTERS
Volume 21, Issue 12, Pages 5233-5239Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01344
Keywords
all-solid-state lithium batteries; sulfide solid electrolyte; thin membrane; ultrahigh conductivity
Categories
Funding
- National Key R&D Program of China [2018YFB0905400]
- National Natural Science Foundation of China [U1964205, 51872303, 51902321]
- Zhejiang Provincial Natural Science Foundation of China [LD18E020004]
- Ningbo S&T Innovation 2025 Major Special Programme [2018B10061, 2018B10087, 2019B10044]
- Youth Innovation Promotion Association CAS [2017342]
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By optimizing the sulfide solid electrolyte membrane and interface design, this study successfully improves the cyclic stability and energy density of all-solid-state lithium batteries.
All-solid-state lithium batteries (ASSLBs) employing Li-metal anode, sulfide solid electrolyte (SE) can deliver high energy density with high safety. The thick SE separator and its low ionic conductivity are two major challenges. Herein, a 30 mu m sulfide SE membrane with ultrahigh room temperature conductivity of 8.4 mS cm(-1) is realized by mechanized manufacturing technologies using highly conductive Li5.4PS4.4Cl1.6 SE powder. Moreover, a 400 nm magnetron sputtered Al2O3 interlayer is introduced into the SE/Li interface to improve the anodic stability, which suppresses the short circuit in Li/Li symmetric cells. Combining these merits, ASSLBs with LiNi0.5Co0.2Mn0.3O2 as the cathode exhibit a stable cyclic performance, delivering a discharge specific capacity of 135.3 mAh g(-1) (1.4 mAh cm(-2)) with a retention of 80.2% after 150 cycles and an average Coulombic efficiency over 99.5%. The high ionic conductivity SE membrane and interface design principle show promising feasible strategies for practical high performance ASSLBs.
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