Novel approach to preparation of LiMn2O4 core/LiNixMn2−xO4 shell composite

Improved elevated temperature performance of commercial LiMn2O4 coated with LiNi0.5Mn1.5O4

“…According to the above results of structural characterization, LMO@LNMO showed a Ni concentration-gradient structure, which was different from the reported LiMn 2 O 4 core/LiNi x Mn 2-x O 4 shell composite [11], spherical core-shell Li 1.1 Mn 1.9 O 4 @LiNi 0.5 Mn 1.5 O 4 [20], and LiMn 2 O 4 /LiNi 0.5 Mn 1.5 O 4 composite with an obvious dense coating layer [21] but was similar to the reported spherical Ni concentration-gradient LiMn 1.87 Ni 0.13 O 4 [22]. The Ni concentration-gradient structure can overcome the disadvantage of the gap between the coating layer and the host material, which is good for the cyclic performance.…”

“…To overcome these drawbacks, doping alien ion, such as Li + , Cu 2+ , Co 2+ , Ni 2+ , Cr 3+ or Al 3+ etc. [5,[9][10][11][12][13], and surface modification by using stable compounds, such as SiO 2 , ZrO 2 , Al 2 O 3 , AlPO 4 , etc. [14][15][16][17][18] on LiMn 2 O 4 were used to improve the cyclic performance.…”

Spinel LiMn2−x Si x O4 (x < 1) through Si4+ substitution as a potential cathode material for lithium-ion batteries

“…, respectively [28,29]. Coexistence of mixed Mn 3+ and Mn 4+ after the The results demonstrate that Mn 4+ has not been completely replaced by Si 4+ as expected, which agrees well with the XRD data presented in Fig.…”

Recent progress of surface coating on cathode materials for high-performance lithium-ion batteries

“…Although this kind of distortion is small, it is big enough to destroy the structure to form a low symmetric and high-disordered tetragonal structure. A layer of LiNi x Mn 2-x O 4 [68] or Al 2 O 3 [42] coating on the LiMn 2 O 4 resulted in the lattice contraction and increased the strength of the Mn-O bond, which improves the stability of the spinel structure and reduces the Jahn-Teller distortion on the surface of LiMn 2 O 4 during the charging and discharging process. With the suppressing the JTE, the capacity fading could be greatly controlled.…”