High-areal-capacity all-solid-state lithium batteries enabled by rational design of fast ion transport channels in vertically-aligned composite polymer electrodes. (July 2019)

• Record Type: Journal Article
• Authors: Yang, Xiaofei; Sun, Qian; Zhao, Changtai; Gao, Xuejie; Adair, Keegan R.; Liu, Yulong; Luo, Jing; Lin, Xiaoting; Liang, Jianneng; Huang, Huan; Zhang, Li; Yang, Rong; Lu, Shigang; Li, Ruying; Sun, Xueliang
• Is Part Of: Nano energy. Volume 61(2019)
• Page Start: 567
• Page End: 575
• Publication Date: 2019-07
• Subjects: Solid-state electrolyte -- Hybrid electrolyte -- Lithium batteries -- Vertically-aligned structure -- Li dendrite; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2019.05.002
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: All-solid-state lithium batteries (ASSLBs) assembled with solid polymer electrolytes (SPEs) have been regarded as promising next-generation rechargeable batteries with improved safety and high energy densities. However, the Li dendrites and poor Li + transport greatly inhibit their practical applications when coupled with relatively high loading cathodes. Herein, we combine a glass fiber (GF)-reinforced composite polymer electrolyte based on poly(ethylene oxide) (labeled as PEO@GF) to suppress Li dendrite growth with a freeze-casted vertically-aligned (VL) electrode to facilitate Li + transport in the high loading cathode. Benefiting from the enhanced mechanical strength and uniformed Li deposition enabled by the implanted GF, the Li–Li symmetric cells exhibit significantly improved cycling stability up to 2000 h (0.2 mA cm −2, 0.2 mAh cm -2 ) and 1000 h (0.42 mA cm −2, 0.4 mAh cm −2 ), which are over one order of magnitude longer than those of the pure PEO electrolyte. Furthermore, VL-LiFePO4 (LFP) cathode divides the thick electrode into numerous vertically-aligned "thin electrodes", which significantly decreases the Li + transport distance and enables the Li | PEO@GF | VL-LFP cell with a high LFP loading of 10.5 mg cm -2 to deliver a high areal capacity of 1.52 mAh cm −2 . The rational structure design of both electrolyte and electrode offers an opportunity for developing high-performance ASSLBs with high active material loadings. Graphical abstract: Image 1 Highlights: The Li–Li symmetric cells with PEO@GF electrolyte exhibit excellent cycling stability up to 2000 h (0.2 mA cm −2, 0.2 mAh cm −2 ). The VL-LFP electrode divides the thick electrode with numerous "thin electrodes, which improves Li + transport capability. 10.5 mg cm −2 LFP loaded Li | PEO@GF | VL-LFP battery delivers a high areal capacity of 1.52 mAh cm −2 .