Composite Li[Li0.11Mn0.57Ni0.32]O2: Two-step molten-salt synthesis, oxidation state stabilization, and uses as high-voltage cathode for lithium-ion batteries

The impact of upper cut-off voltages on the electrochemical behaviors of composite electrode 0.3Li2MnO3·0.7LiMn1/3Ni1/3Co1/3O2

“…Sample preparation: All samples presented in this study were synthesized by a novel molten salts method as described in our previous publication. 18,19 Sample characterization: Phase structures of the samples were determined by X-ray diffraction on a Rigaku DESKTOP X-ray diffractometer using a copper target. Morphologies of the samples were investigated by field emission scanning electron microscopy (SEM) on a JSM6700F apparatus working at 10 kV and transmission electron microscopy (TEM) on a JEM-2010 apparatus with an acceleration voltage of 200 kV.…”

Predominant growth orientation of Li1.2(Mn0.4Co0.4)O2cathode materials produced by the NaOH compound molten salt method and their enhanced electrochemical performance

“…The high temperature molten-salt synthesis method enables a solution-phase reaction environment and atomiclevel mixing of different reactants, which make it easier to obtain a homogenous structure in the nal product. 21,[31][32][33] In this study, we report a compound molten salt method for preparing highly crystallized nanomaterials Li 1.2 (Mn 0.4 Co 0.4 )O 2 with excellent electrochemical performance for advanced lithium-ion batteries. The material morphology was successfully controlled and the crystal growth orientation along [0001] was ideally tuned by introducing NaOH as a mineralizing agent to LiOH-Li 2 CO 3 molten salts.…”

Solution combustion synthesis and enhanced electrochemical performance Li1.2Ni0.2Mn0.6O2 nanoparticles by controlling NO3–/CH3COO– ratio of the precursors

“…All samples exhibit a sloping region and a long followed plateau during the initial charge process. The oxidation of Ni 2+ to Ni 4+ ions is responsible for the sloping region below 4.5 V, whereas simultaneous release of Li + ions and oxygen result in the long 4.5 V plateau, which has been proved by several groups [24][25][26][32][33][34][35]. The charge curves of LLO-4N1A, LLO-3N1A and LLO-N are Table 3 The specific volume of the four as prepared Li 1 similar except the curve of LLO-1N1A.…”

“…For instance, surface nitridation [16] or coating with oxides [11,[18][19][20][21][22], fluorides [23,24], phosphates [25,26] and carbon [27,28] are proved to be effective to improve the electrochemical performance of lithium-rich layered oxides. In addition, fabrication of cathode material with reduced particle size is also demonstrated to improve the high-rate capability of lithium-rich layered oxides [29][30][31][32][33][34][35]. However, the above lithiumrich layered oxides with a primary particle size of 100-300 nm are relatively large.…”