Improved electrochemical performances of LiNi0.5Co0.2Mn0.3O2 modified by Graphene/V2O5 co-coating

Li0.33La0.56TiO3, a novel coating to improve the electrochemical properties and safety of NCM523 cathode materials for Li-ion batteries

“…39,40 Generally, the XRD intensity ratio m = I (003)/ I (104) denotes the degree of cation mixing between Ni 2+ and Li + ; if the ratio is higher than 1.2, the cathode has a low degree of cation mixing. 11,41 It can be seen from Table 2 that all the coated cathodes exhibit a value of m greater than 1.2, implying a structure with limited cation mixing. A characteristic feature of the layered structure can be identified by the parameters c , a and c / a of the unit cell.…”

“…A c/a value greater than 4.899 generally indicates a complete layered structure. 7,11 Based on Table 2 results, the c/a values of the coated cathodes are all higher than 4.899, which further indicates that the LLTO-coated cathodes have an excellent layered structure. According to the analysis, it seems that the crystalline LLTO coating has no obvious advantage over the amorphous coating.…”

“…On the other hand, the LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode has a high discharge capacity but suffers from inferior cycling and thermal stability. 8–10 LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) is one of the promising NCM cathodes and has attracted much attention because of its high theoretical discharge capacity (278 mA h g −1 ), 11 safe operation, and low cost. 12–14…”

“…On the other hand, the LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode has a high discharge capacity but suffers from inferior cycling and thermal stability. [8][9][10] LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) is one of the promising NCM cathodes and has attracted much attention because of its high theoretical discharge capacity (278 mA h g À1 ), 11 safe operation, and low cost. [12][13][14] Unfortunately, dramatic degradation in capacity due to side reactions with electrolytes and also thermal instability due to oxygen release, especially at high operating voltages, have impeded wide use of NCM523 cathode materials.…”

Graphene/Ta2O5 co‐coating to improve the electrochemical performance of cathode material LiNi0.5Co0.2Mn0.3O2 for lithium‐ion batteries

“…In further improve the balance of ion and electronic conductivities for high performance coating layers, the cocoating layers modified cathode materials have been explored for this purpose. [40] For example, Ma et al [41] synthesized PPy-LiAlO 2 coated NCM composites by adopting a dualconductive coating strategy. The PPy-LiAlO 2 coated NCM cathode material, which displayed a superior reversible capacity of 128 mAh g À 1 at 2 A g À 1 and 92.8 % of the initial capacity was maintained over 100 cycles.…”