K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

Abstract

, HK (2012), K0.25Mn2O4 nanofiber microclusters as high power cathode materials for rechargeable lithium batteries, RSC Advances, 2(4), pp. 1643-1649. K0.25Mn2O4 nanofiber microclusters as high power cathode materials for rechargeable lithium batteries Abstract K 0.25 Mn 2 O 4 microclusters assembled from single-crystalline nanofibers were synthesized via a hydrothermal process at different temperatures. The possibility of using these materials as cathode material for lithium ion batteries was studied for the first time. The charge/discharge results showed that the K 0.25 Mn 2 O 4 nanofiber microclusters synthesized at 120 degrees C exhibit excellent lithium storage properties, with a high reversible capability (360 mA h g -1 at current density of 100 mA g -1 ) and stable lithium-ion insertion/de-insertion reversibility. The charge/discharge mechanism in lithium ion batteries was studied and proposed for the first time. During the charge process, K + was extracted from the electrode, which made active vacated sites suitable for lithium ion intercalation and was beneficial for increasing capacity. microclusters assembled from single-crystalline nanofibers were synthesized via a hydrothermal process at different temperatures. The possibility of using these materials as cathode material for lithium ion batteries was studied for the first time. The charge/discharge results showed that the K 0.25 Mn 2 O 4 nanofiber microclusters synthesized at 120°C exhibit excellent lithium storage properties, with a high reversible capability (360 mA h g -1 at current density of 100 mA g -1 ) and stable lithium-ion insertion/de-insertion reversibility. The charge/discharge mechanism in lithium ion batteries was studied and proposed for the first time. During the charge 10 process, K + was extracted from the electrode, which made active vacated sites suitable for lithium ion intercalation and was beneficial for increasing capacity.

Facile Synthesis of Hierarchical Networks Composed of Highly Interconnected V2O5 Nanosheets Assembled on Carbon Nanotubes and Their Superior Lithium Storage Properties

“…In good accordance with the above SEM results, TEM image of CNT@V 2 O 5 (Figure 2d) shows that CNTs were surrounded by V 2 O 5 nanosheets. As can be seen from Figure 2d and f, the nanosheets are about 10−20 22 The as-prepared precursor of V 2 O 5 -mf consists of microflowers with diameter of 1 μm, as shown in Figure S2c (Supporting Information). The inset of Figure S2c (Supporting Information) shows a more highly magnified image of single flower, which is composed of uniform nanosheets.…”

Additive-free synthesis of 3D porous V2O5 hierarchical microspheres with enhanced lithium storage properties

“…2 To meet the demands for use in EVs and HEVs, substantial efforts have been dedicated to finding new 20 competitive electrode materials and new structures. [1][2][3][4] Among the potential cathode materials, V 2 O 5 has been intensively studied in recent years for application in LIBs, due to its high energy density, ease of synthesis, and low cost.…”

Superior Lithium Storage Performance using Sequentially Stacked MnO2/Reduced Graphene Oxide Composite Electrodes

“…As shown in Figure S3 in the Supporting Information, more specific electron spectroscopy analyses clearly show the presence of K + with a K + /Mn 4 + atomic ratio of around 0.20, which is similar to other hydrothermally grown MnO 2 samples. [30,31] The mobile K + ion positioned in (2 2) tunnels that form by edge-sharing MnO 6 octahedra exhibits an additional effect on the electrochemical and magnetic properties of the host MnO 2 ; [31][32][33] this should be considered in our case. To identify the incorporation of K + in MnO 2 , aberration-corrected scanning transmission electron microscopy (STEM) was utilized and it could be inferred that the growth direction of the formed nanowire was [121] with the habitual surface of {111}, as shown in Figure 6 a and b.…”