Modification of LiCoO2 through rough coating with lithium lanthanum zirconium tantalum oxide for high-voltage performance in lithium ion batteries

Boosting the Electrochemical Performance of Li1.2Ni0.13Co0.13Mn0.54O2 by Rough Coating with the Superionic Conductor Li7La3Zr2O12

“…The rate performance in Figure d reveals more superior discharge capacities for the 0.75-LL cathode at current densities of 1C, 2C, and 5C, which can reach 200, 150, and 75 mAh g –1 , respectively, in contrast to those of the pristine cathode (125, 30, and 10 mAh g –1 ). These results suggest that LLZO coating can improve the rate performance of LMR cathodes at high current densities (1C-5C) due to the enhancement of Li + diffusion and suppression of side reactions at LMR-LLZO interfaces. ,, It can be further confirmed by the results of EIS. Moreover, higher LLZO content, in other words, thicker LLZO layer, results in higher discharge capacities at high rate, indicative of the beneficial effect of relatively thick LLZO modification at large current densities.…”

“…Upon the surface modification with LLZO layers, the coated cathodes exhibit slightly reduced specific capacities as compared to the pristine one during the initial charge and discharge processes (Figure b). This could be ascribed to the lack of electrochemical activity of the LLZO. ,,, The slight reduction in the discharge/charge capacities of LLZO-coated cathodes (Figure c) is somehow compensated by the improved capacity retention in the following cycles.…”

“…However, this process generally requires specific equipment and exploration of complex parameters, including suitable precursors, deposition temperature, chamber pressure, and atmosphere, which may not favor the large-scale production. Recently, rough wet surface coating has emerged as another effective way for surface modification due to its low cost, feasibility of conformal coating, as well as broad applicability for industrial production …”

“…Recently, rough wet surface coating has emerged as another effective way for surface modification due to its low cost, feasibility of conformal coating, as well as broad applicability for industrial production. 29 Considering the promising effects of LLZO coating on improving the Li-ion diffusion and stability of electrode/ electrolyte interface, in this work, we aim to coat a uniform LLZO layer on Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 cathode via a facile method of rough wet surface coating. The influence of LLZO addition with diversified contents was explored to achieve the optimum concentration and the best electrochemical performance in coated cathodes.…”

High-Content Lithium Aluminum Titanium Phosphate-Based Composite Solid Electrolyte with Poly(ionic liquid) Binder

“…However, current commercial Li-ion batteries are mainly assembled with organic liquid electrolytes, which are leaky, flammable, and volatile, leading to severe security risks [ 4 , 5 , 6 ]. To address the above issues, active ceramic-based solid electrolytes have been designed and fabricated for increasing the security of Li-ion batteries [ 7 ], such as garnet-type lithium lanthanum zirconium oxide [ 8 ], LISICON-type lithium-ion conductor [ 9 ], NASICON-type lithium aluminum titanium phosphate [ 10 ], and perovskite-type lithium lanthanum titanium oxide [ 11 ]. Although these active ceramics have excellent bulk ionic conductivity, the grain, grain boundaries, and their interfaces also exist in the electrolyte films, which dramatically decrease the total conductivity [ 12 , 13 , 14 ].…”