Hydrothermal synthesis of core-shell Mn3O4@C microspheres as superior anode materials for high-performance lithium-ion storage

Rational design of 3D net-like carbon based Mn3O4 anode materials with enhanced lithium storage performance

“…The characteristics of the charge-discharge curves are in good accordance with the conversion reaction of manganese oxide used as anode materials for LIBs which have been reported before. [44][45][46][47] In the first discharge curve, one broad voltage plateau at 1.7-0.3 V is related to the formation of the SEI layer and the initial reduction of Mn 3 O 4 . 48 A well-defined discharge plateau at 0.3 V corresponds to the reduction of MnO to metallic Mn.…”

New insights into the outstanding performances of nickel‐doped manganese oxide nanoparticles embedded in a 3D carbon nanopipes framework as anode for lithium and sodium‐ion batteries

“…Similarly, the C‐O‐C bonding indicates binding between the O atom and the C atom in CMK‐5. The deconvolution of high‐resolution C 1s spectra showed three peaks around 283.1, 284.5, and 287.5 eV, that could be attributed to sp 2 carbon (C‐C) from CMK‐5, carbon with hydroxyl or carboxylic groups (C‐O) and carbonyl groups (C=O), respectively 46,52 …”

“…The Mn 2p spectrum displayed two peaks centered at 641.6 and 653.5 eV for Mn 2p 3/2 and Mn 2p 1/2 , sequentially, with spin-orbit energy separation of 11.9 eV, which further suggested that most of the NPs in CMK-5 were Mn 3 O 4 . 21,46 The deconvoluted profile of the Mn 2p 3/2 region showed two peaks around 641 and 642.5 eV, corresponding to +2 and +3 oxidation states of Mn, while for Mn 2p 1/2 region, the peaks appeared around 652.5 and 653.8, respectively, for all the Mn 3 O 4 (x)@CMK-5 nanocomposites. 47 In the case of Ni-doped Mn 3 O 4 (1)@CMK-5, the peaks for the Mn 2p 3/2 and Mn 2p 1/2 regions slightly shifted to 641.9 and 653.6 eV, sequentially, with spinorbit splitting energy of 11.7 eV (Figure 5).…”

“…The present capacity of Ni(5)-Mn 3 O 4 (1)@CMK-5 electrode is higher or analogous to former Mn 3 O 4 -based anodes stated in the articles. [15][16][17][19][20][21][22][23][24][25][26][27][32][33][34][35]46,52,53,56,57 The atomic scale changes to Mn 3 O 4 NPs with Ni doping, proper encapsulation of Mn 3 O 4 NPs within the CMK-5 matrix, and capacity contribution from bimodal CMK-5 help to achieve the stated capacity for Ni(5)-Mn 3 O 4 (1)@CMK-5 anode. The comparison of capacities of the current electrode systems with the published literature on Mn 3 O 4 -based electrodes is illustrated in Table S2 (SI).…”

“…-O) and carbonyl groups (C=O), respectively. 46,52 Raman spectra were analyzed to ascertain the phase and structure of the nanocomposites. The Raman spectra of CMK-5, Mn 3 O 4 (x)@CMK-5, and Ni(y)-Mn 3 O 4 (1) @CMK-5 are shown in Figure S6 (SI).…”