Spinel MgAl₂O₄ modification on LiCoO₂ cathode materials with the combined advantages of MgO and Al₂O₃ modifications for high-voltage lithium-ion batteries

Abstract

In order to improve the electrochemical performance of LiCoO2 cathode in a high-voltage range of 3.0–4.5 V, spinel MgAl2O4 has been modified on the surface of LiCoO2 particle by a facile high-temperature solid state reaction.

Electrode Protection and Electrolyte Optimization via Surface Modification Strategy for High‐Performance Lithium Batteries

“…This significant performance enhancement is attributed to the P-O tetrahedron, which reduces the activity of lattice oxygen, and decreases the harmful phase transition and inter cracks, thus ensuring the layered-structure stability. Similar results can be obtained in the modified LCO cathode with many other Li + -embedded coating materials (MgAl 2 O 4 , [68] LiAlSiO 4 , [39] Li 2 CO 3 , [69] CoAl 2 O 4 , [70] BaTiO 3 [27] et al). For instance, Xie et al [41] adopted ALD method to deposit a LiAlO 2 layer on LCO surface.…”

Ionic Conducting Properties and Fuel Cell Performance Developed by Band Structures

“…The LMCO–SDC composite material exhibits the core peaks for Co (2p 3/2 at 779.56 and 2p 1/2 at 794.86 eV) slightly shifted to a higher binding energy than LCO–SDC composite material, indicating the possible partial oxidation of Co 3+ to Co 4+ . The presence of Co 3+ and Co 4+ could facilitate ORR and oxygen evolution reaction. , The Mg 1s BE peak detected at 1303.4 eV is assigned to Mg 2+ , and it confirms the existence of Mg 2+ in the LMCO–SDC composite material shown in Figure c. The peaks in the spectrum of Ce 3d were observed in different ionic states such as Ce 3+ (BEs are 3d 5/2 at 878 and 3d 3/2 at 896 eV) and Ce 4+ (BEs are 3d 5/2 at 898.3 and 3d 3/2 at 916.6 eV) shown in Figure d.…”

Constructing compatible interface between Li7La3Zr2O12 solid electrolyte and LiCoO2 cathode for stable cycling performances at 4.5 V

“…[10][11][12][13][14][15][16][17] However, their commercial application are still hindered by the rapid voltage/capacity deterioration, as well as the structural and thermodynamic instabilities upon cycling. [15][16][17] For example, layered LiCoO2 (LCO), the first commercialized cathode material in 1991, 18,19 the boom in its fundamental research and new applications continues and still presents competitive edge among high-capacity cathode materials, 12,[20][21][22][23][24][25] being one preferred cathode material for portable electronics due to its high redox potential (~ 3.9 V vs. Li/Li + ), large theoretical specific capacity (274 mAh g -1 ), high electronic conductivity (~ 10 -4 S cm -1 ), theoretical density (~ 5.06 g cm -3 ) and compressed electrode density, as well as easy preparation. [26][27][28][29] Nevertheless, it can only steadily operate at a relative lower potential range of 3.0 ~ 4.2 V in order to maintain good structural and electrochemical stabilities, 20,30 delivering a moderate discharge capacity of only ~ 140 mAh g -1 .…”

“…27,29,31 Specifically, the interfacial side reactions between Li1-xCoO2 (0.5<x<1) cathode and electrolyte components lead to severe voltage/capacity decay, accompanied with oxygen loss, surface structure degeneration (from layered structure to the spinel structure), electrolyte decomposition, and the increase of interfacial impedance, etc. 20,27,[31][32][33] To address the aforementioned concerns of LCO, various modification strategies such as surface coating, bulk doping and the utilization of electrolyte additives have been extensively investigated. 34,35 Metal oxides (MgO, [36][37][38] Al2O3, 39,40 ZrO2, 41,42 MgAl2O4 20 ), metal phosphates (AlPO4, 43,44 Mg3(PO4)2) and fluorides (AlF3, 45,46 LaF3, 47 MgF2 48,49 ) have been extensively…”

“…20,27,[31][32][33] To address the aforementioned concerns of LCO, various modification strategies such as surface coating, bulk doping and the utilization of electrolyte additives have been extensively investigated. 34,35 Metal oxides (MgO, [36][37][38] Al2O3, 39,40 ZrO2, 41,42 MgAl2O4 20 ), metal phosphates (AlPO4, 43,44 Mg3(PO4)2) and fluorides (AlF3, 45,46 LaF3, 47 MgF2 48,49 ) have been extensively…”