Multilayer-graphene-stabilized lithium deposition for anode-Free lithium-metal batteries. Issue 6 (23rd January 2019)

• Record Type: Journal Article
• Authors: Assegie, Addisu Alemayehu; Chung, Cheng-Chu; Tsai, Meng-Che; Su, Wei-Nien; Chen, Chun-Wei; Hwang, Bing-Joe
• Is Part Of: Nanoscale. Volume 11:Issue 6(2019)
• Page Start: 2710
• Page End: 2720
• Publication Date: 2019-01-23
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr06980h
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Ultra-thin multilayer graphene film domain grown on Cu by chemical vapor deposition enables dendrite free lithium deposition in an anode-free Li metal battery via distributing localized current. Abstract : The will to circumvent capacity fading, Li dendrite formation, and low coulombic efficiency in anode-free Li-metal batteries (AFLMBs) requires a radical change in the science underpinning new materials discovery, battery design, and understanding electrode interfaces. Herein, a Cu current collector formed with ultrathin multilayer graphene grown via chemical vapor deposition (CVD) was used as an artificial layer to stabilize the electrode interface and sandwich-deposited Li with Cu. A multilayer graphene film's superior strength, chemical stability, and flexibility make it an excellent choice to modify a Cu electrode. Fabricating an anode bigger than the cathode improved the alignment of the electrodes during assembly, minimizing interfacial stress. Here, 19 mm electrodes when paired with a commercial LiFePO4 cathode (mass loading: ∼12 mg cm −2 ) delivered the first-cycle discharge capacities of 147 and 151 mA h g −1 for bare and multilayer-graphene-protected electrodes, respectively, which could alleviate the big hurdle (initial capacity loss) in anode-free batteries. After 100 round-trip cycles, bare Cu and multilayer-graphene-protected electrodes retained ∼46 and ∼61% of their initial capacities, respectively, in an ether-based electrolyte at the rate of 0.1 C.