Insight into pseudocapacitive-diffusion mixed kinetics and conversion-alloying hybrid mechanisms of low-cost Zn-Mn perovskite fluorides anodes for powerful Li-ion/dual-ion storage

Publication date: Available online 21 January 2020Source: Chemical Engineering JournalAuthor(s): Danfeng Ying, Qilei Xu, Rui Ding, Yongfa Huang, Tong Yan, Yuxi Huang, Caini Tan, Xiujuan Sun, Ping Gao, Enhui LiuAbstractLithium (Li)-ion batteries (LIBs), Li-ion capacitors (LICs) and Li-based dual-ion batteries (Li-DIBs) are three types of promising energy storage devices. However, the performance of these devices is largely limited by the sluggish kinetics and inferior stability of conventional volume insertion and alloying anodes. In this work, we have reported novel cost-competitive zinc-manganese perovskite fluorides (K-Zn-Mn-F, denoted as KZMF) anodes with superior kinetics and stability for advanced LICs, LIBs, Li-DIBs and their hybrids (LIC/LIBs and Li-DIB/LIBs). Combining both experimental and first-principles density functional theory (DFT) methods, the KZMF(1-3) (Zn/Mn=1-3) candidate with the formula of K1.1Zn0.17Mn0.83F3.03 exhibits the superior performance than the other KZMF samples owing to the optimal synergistic effect of Zn and Mn electroactive species. Ex situ characterizations and electrochemical techniques revealed typical conversion-alloying hybrid mechanisms and pseudocapacitive-diffusion mixed control kinetics of the KZMF(1-3) anode for Li-ion storage. The designed LIBs, LICs, Li-DIBs, LIC/LIBs and Li-DIB/LIBs with the KZMF(1-3) as anode and activated carbon (AC), LiFePO4 (LFP), graphite (918), AC+LFP (1:1) and 918+LFP (1:1) as cathodes respectively show r...

Source: Chemical Engineering Journal - January 21, 2020 Category: Chemistry Source Type: research