Facile Combustion Synthesis and Electrochemical Performance of the Cathode Material Li_1.231Mn_0.615Ni_0.154O₂

Abstract

The composite Li1.231Mn0.615Ni0.154O2 has been prepared by a facile combustion synthesis. X‐ray diffraction, thermogravimetric analysis, chemical analysis, X‐ray photoelectron spectroscopy and scanning electron microscope were used to characterize the resultant composite and its precursor. The results show that a well‐crystallized layered hexagonal structured composite Li1.231MnIV0.615NiII0.154O2 is obtained. The resultant composite serves as a cathode material for lithium ion batteries, and galvanostatic charge/discharge tests and cyclic voltammetry revealed that the composite exhibits excellent electrochemical performance. The as‐prepared electrode delivers an average specific energy density as high as 795 W h kg–1 in the range 4.8–2.0 V (vs. Li/Li+) at a constant current density of 20 mA g–1.

Cobalt-doped lithium-rich cathode with superior electrochemical performance for lithium-ion batteries

“…1a and b show a uffy porous morphology formed by small aggregated particles, which is the result of the decomposition of sucrose, nitrate, and acetate, accompanying the escaping gases such as CO 2 and H 2 O. 4 The EDS estimation of the selected region in the SEM image of Fig. 1b is depicted in Fig.…”

“…1 Since Numata et al 2 reported the solid solution of the LiCoO 2 -Li 2 MnO 3 system in 1997, the Li 2 MnO 3 -stabilized cathode has been widely investigated as an alternative to LiCoO 2 cathode in lithium-ion batteries for their high theoretical capacity (about 350 mA h g À1 ) at higher voltages, lower cost and improved thermal stability. [3][4][5] However, the poor electrochemical performances of this type of materials severely obstruct their application. Nowadays, several methods have been used by researchers to further improve the electrochemical properties of the cathode such as preparing materials by the template method, 6 special nanostructures, 7 modifying the material surface with oxides (e.g., ZnO) 8 or adding a conductive substances (e.g., carbon).…”

“…In the previous work, 4 the composite Li 1.231 Mn 0.615 Ni 0.154 O 2 was prepared by a facile combustion synthesis. On this basis, we herein report a series of Co-doped Li 1.231 Mn 0.615À0.75x Ni 0.154 -Co x O 2 (x ¼ 0, 0.02, 0.05, 0.07, 0.10, 0.12, 0.15, 0.20, 0.25) samples by this method.…”