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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
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.cej.2020.124154
Danfeng Ying , Qilei Xu , Rui Ding , Yongfa Huang , Tong Yan , Yuxi Huang , Caini Tan , Xiujuan Sun , Ping Gao , Enhui Liu

Lithium (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 remarkable performance. This work addresses the new insight of cost-competitive Zn-Mn perovskite fluorides anodes with pseudocapacitive-diffusion mixed control kinetics and conversion-alloying hybrid mechanisms for powerful Li-ion/dual-ion storage and will have a significant impact on developing advanced energy storage devices.



中文翻译:

低成本Zn-Mn钙钛矿型氟化物阳极的伪电容扩散混合动力学和转化合金混合机理的见解,可实现强大的锂离子/双离子存储

锂(Li)离子电池(LIB),锂离子电容器(LICs)和基于锂的双离子电池(Li-DIB)是三种有前途的储能设备。然而,这些装置的性能在很大程度上受到常规体积插入和合金化阳极的缓慢动力学和较差的稳定性的限制。在这项工作中,我们已经报道了具有成本竞争力的新型锌锰钙钛矿氟化物(K-Zn-Mn-F,表示为KZMF)阳极,对于先进的LIC,LIB,Li-DIB及其混合物(LIC / LIB和Li-DIB / LIB)。结合实验原理和第一性原理密度泛函理论(DFT)方法,候选KZMF(1-3)(Zn / Mn = 1-3)的公式为K 1.1 Zn 0.17 Mn 0.83 F 3.03由于Zn和Mn电活性物质具有最佳的协同作用,因此具有优于其他KZMF样品的性能。异位表征和电化学技术揭示了典型的转化合金混合机理和拟电容扩散控制锂离子存储的KZMF(1-3)阳极的动力学。设计的LIB,LIC,Li-DIB,LIC / LIB和Li-DIB / LIB,其中KZMF(1-3)为阳极,活性炭(AC),LiFePO 4(LFP),石墨(918),AC + LFP(1:1)和918 + LFP(1:1)分别显示出出色的性能。这项工作提出了具有成本竞争力的锌锰钙钛矿型氟化物阳极的新见解,其具有拟电容扩散混合控制动力学和转化合金混合机制,可实现强大的锂离子/双离子存储,并将对发展先进的能量存储产生重大影响设备。

更新日期:2020-01-22
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