Bi₂Mn₄O₁₀: a new mullite-type anode material for lithium-ion batteries

Abstract

The low specific capacity of graphite limits the further increase of the energy density of lithium-ion batteries and their widespread applications. Exploring new anode materials is the key issue. Herein, a new mullite-type compound Bi2Mn4O10 is designed and synthesized. The Bi2Mn4O10/C composite delivers a high reversible specific capacity of 846 mA h g-1 (more than twice that of graphite), and exhibits a high capacity retention of 100% after 300 cycles at 600 mA g-1, which is reported for the first time. The high specific capacity originates from the combination of the conversion reaction and alloying-dealloying reaction, which has been confirmed by the ex situ XRD, IR, SEM and TEM studies. In addition, the unique nanocomposite generated during the charge-discharge process provides excellent cycling stability. This work proves that Bi2Mn4O10/C is a potential anode material for advanced lithium-ion batteries.

Micro/nanostructured Bi2Mn4O10 with hierarchical spindle morphology as a highly efficient anode material for lithium‐ion batteries

“…In this structure, Mn 4+ ion is coordinated by six oxygen atoms forming an octahedron, Mn 3+ ion is linked by five oxygen atoms forming a tetragonal pyramid, whereas Bi atom is coordinated to six oxygen atoms to form distorted octahedral. 8 The temporal morphological evolution of the obtained resultants was observed by SEM images. As shown in Figure 2A, the sample before hydrothermal reaction was composed of nanoparticles.…”

“…Combined with the ex-XRD and XPS data for the BMO-24 electrode after 400 cycles (Figures S2 and S3), the whole reactions can be suggested as 6,8,14 Bi 2 Mn 4 O 10 + 20Li + + 20e − → 2Bi + 4Mn + 10Li 2 O (1)…”

“…F I G U R E 7 BMO-24: (A) the first four cyclic voltammetry (CV) curves at 0.1 mV s −1 in 0.01-3.0 V and (B) the selected discharge-charge curves at 0.2 C, the as-prepared BMO: (C) cycle performances at 0.2 C and (D) rate capabilities at different current weak peak at 0.61 V can be attributed to the reduction of Mn 3+/4+ and Bi 3+ to Mn and Bi, respectively, 6 whereas the peak at 0.25 V can be assigned to the formation of solid electrolyte interface (SEI) film with the electrolyte decomposition, the alloying reaction between Bi and Li. 8,14 In the initial anodic scan, the abroad oxidation peak at 1.2 V can be related to the oxidation of metal Mn and Bi, as well as the de-alloying process. 6 As expected, the profiles in the later scan show an obvious difference compared to that of the initial cycle, implying the irreversible phase transformation in the first lithium insertion/extraction process, which is a general phenomenon for metal oxide electrodes.…”

“…7 Microparticles BMO prepared by Song et al delivered about 240 mA h g −1 after 100 cycles at 300 mA g −1 . 8 However, the general existed volume change for alloying and conversion reaction during charge-discharge process results into serious electrode pulverization, quick capacity fading, the unsatisfied cyclability, and poor rate capability, which prevent its industrialized application. 9 Although reducing particle sizes has been demonstrated to improve the rate of Li + insertion/extraction and the electron transport, alleviating change variation, as well as increasing the active sites compared to their bulk counterparts, it also brings some disadvantages such as habitual electrochemical aggregation, more side reactions, and lower energy density.…”

Structure, thermoelectric and electrical properties of bismuth-manganese oxide prepared by mechanochemical method

“…The combinational properties of multiferroic materials are considered as a main key for the importance of their widely found applications such as energy transducers [1] and battery electrodes [2]. Recently, Bi2O3-MnO2 nanocomposites have been examined as electrode for supercapacitors [3].…”