Study on the binary transition metal oxide Mn2V2O7 structures for high performance lithium-ion batteries

Ca2V2O7 as an Anode‐Active Material for Lithium‐Ion Batteries: Effect of Conductive Additive and Mass Loading on Electrochemical Performance

“…Following Ref [17,54,55] . the substantial decrease in capacity observed in the first cycles occurs due to the consumption of lithium ions as a result of the irreversible phase transition $${({M}_{x}{X}_{y}+{zLi}^{+}+z{e}^{-}\leftrightarrow xM+{Li}_{z}{X}_{y}}$$ ), which was previously detected in CoV 2 O 6 [17,54,55] and Mn 2 V 2 O 7 [17,21,56] . However, other authors claim that the capacity drop occurs due to SEI formation when the decomposition of the organic electrolyte is thermodynamically favorable at potentials below 1 V (versus Li/Li + ), [57] as observed in Co 2 V 2 O 7 , [18,33] Cu 2 V 2 O 7 [58] and Zn 2 (OH) 3 VO 3 [59] .…”

“…, which was previously detected in CoV 2 O 6 [17,54,55] and Mn 2 V 2 O 7 . [17,21,56] However, other authors claim that the capacity drop occurs due to SEI formation when the decomposition of the organic electrolyte is thermodynamically favorable at potentials below 1 V (versus Li/ Li + ), [57] as observed in Co 2 V 2 O 7 , [18,33] Cu 2 V 2 O 7 [58] and Zn 2 (OH) 3 VO 3 . [59] Nevertheless, the authors note that the SEI layer could not be seen by SEM imaging techniques which are confirmed in our study.…”

“…Thus, searching for novel anode materials with high electrochemical performance is an ongoing task. [12] Numerous vanadium oxides have already been studied as potential anodes for LIBs, such as MV 2 O 4 , [13,14] MV 2 O 6 , [15,16] MV 2 O 7 , [17][18][19][20][21] MV 2 O 8 , [22,23] for different reasons. One reason is that the vanadium element possesses several valence states and can form various structures, leading to rich Li + storage.…”

Ammonium-ion energy storage devices for real-life deployment: storage mechanism, electrode design and system integration

“…The design strategy of heterostructures can accelerate electron transport by internal electric fields at heterogeneous interfaces, bringing unique interfacial properties. 131–133 The Du group grew fluffy VO x nanosheets uniformly on VS 2 to form VS 2 /VO x heterostructures, which could be used as energy storage materials for Zn 2+ and NH 4 + with better performance than pure VS 2 . 80 XRD and XPS could confirm the formation of VS 2 /VO x heterostructures and TEM images could also confirm this phenomenon, as shown in Fig.…”

P-doping boosting electronic properties and ionic kinetics of MnV2O6 for high-performance lithium-ion batteries

“…25,26 Meanwhile, manganese vanadate also exhibits promising electrochemical behaviors, which originate from its layered structure, relatively low molecular weight, and the polyvalent properties of manganese. [27][28][29][30] Nevertheless, similar to other transition metal oxides, manganese vanadate suffers from some disadvantages such as poor conductivity for electron transfer and ion diffusion, and severe volume changes during the charging and discharging process, leading to crushing of the electrode material and thus a suboptimal rate performance and cycling stability. To address these issues, many strategies have been used to overcome these drawbacks, such as nanohybrids, 6,10,12,31 surface-coating, 5,11,32 interfacial engineering, 33 and element-doping.…”