Use of Zirconium Dual-Modification on the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode for Improved Electrochemical Performances of Lithium-Ion Batteries

Abstract

A ZrO2-coated and Zr-doped LiNi0.8Co0.1Mn0.1O2 cathode is successfully fabricated, and its electrochemical performances are evaluated. The 0.5 wt % ZrO2-coated and Zr-doped LiNi0.8Co0.1Mn0.1O2 cathode exhibits excellent electrochemical performances compared to the pristine LiNi0.8Co0.1Mn0.1O2. The 0.5 wt % ZrO2-coated and Zr-doped LiNi0.8Co0.1Mn0.1O2 cathode shows a high discharge capacity of 220.9 mA h g–1. Moreover, it maintains a capacity retention of 76.1% after 60 cycles. Most importantly, it has extraordinary retention capacities of 76.7 and 59.1% at 4.0 and 6.0 C, respectively. This is because ZrO2 coating and Zr doping contribute to rapid Li+ conductivity and good structural stability. Thus, the LiNi0.8Co0.1Mn0.1O2 cathode with a suitable amount of ZrO2 coating and Zr doping is considered a good candidate for state-of-the-art Li-ion batteries.

Diffusion of Zirconium (IV) Ions from Coated Thick Zirconium Oxide Shell to the Bulk Structure of Ni‐Rich NMC811 Cathode Leading to High‐Performance 18650 Cylindrical Li‐Ion Batteries

“…[ 21 ] Very recently, Jo et al., coated ZrO 2 on NMC811 by using a resonant acoustic mixing and sintering at 750 °C having a synergetic effect. [ 34 ] However, all techniques above have some drawbacks. They are not yet green and scalable.…”

Facile Surface Modification of MgMn2O4 Positive-Electrode Material for Improving Cycle Performance of Magnesium Rechargeable Batteries

“…For example, Mg 1+ x M 2– x O 4 ( M = transition metal) with a spinel structure, − Mg M O 2 with a rocksalt structure, ZnMnO 3 with a deficient spinel structure, , and magnesiated layered materials − have been investigated, considering the fact that spinel and layered rocksalt structures provide ion diffusion paths in LIB electrode materials. Among these oxides, spinel-type MgMn 2 O 4 with a high theoretical capacity (270 mA h g –1 for Mg insertion) is promising because it is composed only of abundant elements (Mg, Mn, and O) and can be synthesized by a simple inverse coprecipitation method with subsequent heat treatment. , Indeed, MgMn 2 O 4 can deliver high discharge capacities over 200 mA h g –1 , but its cycle performance in anhydrous electrolytes is supposed to be insufficient for practical use. ,, As is well known, in the case of LIBs and other rechargeable batteries, surface modification and partial substitution of the electrode powders are the good strategies to overcome this drawback. − Currently, however, there are few reports on the surface modification of MRB electrode materials. − …”

“…In this work, we focused on MgMn 2 O 4 as a positive-electrode material and performed surface modification on the powder to improve the cycle performance of the MRBs. ZrO 2 modification of the positive-electrode materials in LIBs has been known to enhance electrochemical properties, such as the cycle performance; − therefore, it was selected as the modification material for MgMn 2 O 4 in this study. The surface properties of pristine and surface-modified MgMn 2 O 4 were characterized by X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX).…”

One Stone Three Birds: Na–Zr Co-Doping and Li6Zr2O7 Coating Enhance the Structural Stability and Electrochemical Performance of the LiNi0.8Co0.1Mn0.1O2 Cathode Material

“…34−37 Since Zr−O (760 kJ mol −1 ) has the higher bond energy than that of Ni−O (391.6 kJ mol −1 ), Co−O (368 kJ mol −1 ), and Mn−O (402 kJ mol −1 ), Zr 4+ can destroy the stability of Ni 2+ in tetrahedral sites through its powerful electrostatic effect, thus changing the migration path of Ni 2+ , increasing the Ni 2+ migration barrier, and reducing the Li/Ni mixing. 37 Forming from the surface of Li and Zr(OH) 4 , Li 6 Zr 2 O 7 acts as a lithium-ion conductor to accelerate the diffusion of Li + and plays a role in indicating protection. 14,38,39 In this work, Na−Zr dual doping and Li 6 Zr 2 O 7 coating (three birds) are introduced to multimodify NCM via a onestep high-temperature solid-state way (one stone).…”