Enhancement of the electrochemical properties of LiMn2O4 through Al3+ and F− co-substitution

Synthesis and electrochemical performance of modified LiMn2O4 by Zn2+ and PO43− co-substitution

“…5, the cyclic voltammogram of LiMn 2 O 4 indeed has two well-defined splitting anodic/cathodic peaks, indicating its pure and good spinel crystal structure, while those of LiZn 0.05 Mn 1.95 O 3.96 (PO 4 ) 0.025 are relatively blurry due to a small amount of Zn and co-substitution. The doping may increase the repulsive interaction between lithium positive-positive ions in the oxide lattice; the result is consistent with the reports of Bao et al [20]. Fig.…”

Improving the electrochemical performance of LiMn2O4/graphite batteries using LiF additive during fabrication

“…It follows that the additive LiF not only improves the initial capacity, but also can improve the cycling performance of the spinel manganese battery. This result was not achieved in previous reports [13][14][15][16][17][18]. This is a salient result for the practical use of the LiMn 2 O 4 battery, although the capacity retention ratio is only enhanced by about 2% after 100 cycles.…”

“…Recently, metal ions and F − co-substitution or F − substitution were studied to improve the electrochemical performance of LiMn 2 O 4 . The cycling performance was improved, but the initial capacity was a little lower [13][14][15][16][17][18], but they did not study the storage performance of the LiMn 2 O 4 battery. Thus it is necessary to enhance the initial capacity, capacity retaining ratio after cycling, and the capacity recovery ratio after storage through other methods.…”

Structural characterization and electrochemical performance of lithium trivanadate synthesized by microwave sol–gel method

“…Compared with conventional sintering method, microwave is so powerful and efficient that the expected materials can be obtained in shorter duration and at lower temperature [4], which could cut down the cost of the production. Recently, there are some references on microwave utilization to prepare cathode materials including LiCoO 2 [5], LiMn 2 O 4 [6][7][8], lithiated mixed Co-Mn-Ni oxides [9,10] and LiFePO 4 [11], etc. However, seldom literatures on preparing LiV 3 O 8 by microwave method could be found except the report of G. Yang et al [12], where LiV 3 O 8 was prepared by microwave solid-state synthesis and the best sample was prepared at 530 • C in 100 min having a discharge capacity of 210 mAh/g within 20 cycles at a current density of 0.2 mA/cm 2 .…”