Electrochemical Performance of Modified LiMn₂O₄Used as Cathode Material for an Aqueous Rechargeable Lithium Battery

Abstract

To improve the electrochemical performance of cathode material in aqueous LiNO 3 solution, modified spinel LiMn 2 O 4 materials prepared with different amounts of sucrose additive are synthesized using a two-step sintering method. The phase structure and morphologies of as-prepared samples are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Electrochemical performances of modified LiMn 2 O 4 used as the cathode material of the aqueous rechargeable lithium battery (ARLB) are investigated by galvanostatic charge/discharge testing. The effects of the carbon, which decomposed from the additive sucrose, on the electrochemical performances of the modified spinel LiMn 2 O 4 cathode for the ARLBs are discussed. In comparison to pristine LiMn 2 O 4 , the optimum quantity of sucrose addition improves the electrochemical performance of spinel LiMn 2 O 4 material in an aqueous LiNO 3 solution, especially for the addition of 20 wt % sucrose, and its initial discharge specific capacity is 118.3 mAh g À1 ; moreover, it still has 102.8 mAh g À1 after 40 cycles.

Long-Range and Short-Range Transport Dynamics of Li Ions in LiMn2O4

“…The pattern of LMO agrees well with the file PDF #01-089-0118. The reflections including 111, 311, 222, 400, 511, and 440 are the typical diffraction of cubic spinel LMO with the Fd 3 m space group. − In order to determine the structural parameters of LMO, Rietveld refinement was carried out using the spinel LiMn 2 O 4 structure model, where Li ions occupy the tetrahedral (8 a ) sites and the transition-metal (Mn) ions fully occupy the octahedral (16 d ) site. Based on this refinement result, the structural parameters ( a = b = c ) of the cubic spinel are determined to be 8.2518 Å.…”

Porous A‐SnO2/rGO Nanocomposite via Annealing Treatment with Stable High‐Capacity as Anode of Lithium‐Ion Battery

“…With the increasing prominence of environmental and energy issues, human beings need to develop new energy and energy storage devices with environment benignity, safety and efficiency . As a new type of high energy density, no memory effect and green energy storage devices, lithium‐ion batteries (LIBs) have been widely used in portable electronic devices, electric vehicles and so forth .…”

NaTi₂(PO₄)₃/Carbon and NaTi₂(PO₄)₃/Graphite Composites as Anode Materials for Aqueous Rechargeable Na-ion Batteries

“…[6][7][8] Numerous studies have explored suitable electrode materials and electrolytes for constructing energy storage devices. [9][10][11][12][13][14] A neutral pH aqueous electrolyte rechargeable Na-ion battery, compared with lithium-ion battery, is a promising choice and may overcome existing limitations for large-scale applications. These limitations include flammable organic electrolytes, expensive resources, thermal safety and poor cyclability.…”