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www.advancedsciencenews.com www.advmat.de Figure 2. The proof-of-concept of the AEA-ASSLBs: a) Electronic conductivities of our AEA materials in comparison with the available conductive carbon additives and traditional cathodes, obtained via the 4-electrode powder electronic conductivity test. b) Li-ion diffusion coefficients of our AEA materials obtained via the potentiostatic intermittent titration technique method in comparison with the available traditional cathodes and typical SSEs. c,d) The galvanostatic discharge–charge profiles of the Li0.1TiS2- and LiMo6S8-based AEA cathodes. e) Their corresponding cycling stabilities at 0.1C/70 °C. namely, layer-structured TiS2 and chevrel-phase Mo6S8, which not only have a very stable host structure but also high elec- tronic conductivity.[33] Mo6S8 and TiS2 have a high electronic conductivity, which is over 3–6 orders of magnitude higher than that of the typical cathode materials (NMC532 and carbon- coated LiFePO4), and comparable to the commercial conduc- tive carbon (Super P) (Figure 2a, see the detailed informa- tion in Table S4, Supporting Information). These superhigh electronically conducting TiS2 and Mo6S8 materials allow for eliminating the conductive carbon in the electrode. In addi- tion, Mo6S8 and TiS2 have a high Li-ion diffusion coefficient of 1.8–9.8 × 10−8 and 8 × 10−9 to 9 × 10−10 cm2 s−1 (see the detailed information in Figure S1, Supporting Information),[25,34,35] which is comparable to that of SSEs (Li10GeP2S12, 8.8–9 × 10−8 cm2 s−1, Li10SiP2S12, 7–7.2 × 10−8 cm2 s−1, Li6.25Al0.25La3Zr2O12, 1–1.1 × 10−8 cm2 s−1), and far higher than that of the conventional commercial cathodes (LiFePO4: 6.8 × 10−16 to 1.8 × 10−14 cm2 s−1, NMC: 2.8–8 × 10−11 cm2 s−1, LiCoO2: 10−11 to 10−12 cm2 s−1) (Figure 2b, see the detailed information in Table S5, Supporting Information).[36–45] As such, they can serve as solid-state electrolytes rather than filling electrolytes in the electrodes. Meanwhile, the intercalation compounds of Mo6S8 and TiS2 enable Li-ion storage in their host with the high stability of the host framework structure and the low fluc- tuation of ionic and electronic conductivity. Based on the above merits of the physicochemical properties, we decided to use full Adv. Mater. 2021, 33, 2008723 2008723 (3 of 9) © 2021 Wiley-VCH GmbHPDF Image | Dense All-Electrochem-Active Electrodes for All-Solid-State Lithium Batteries
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