Effect of Magnesium Doping on Voltage Decay of Nickel‐Rich Cathode Materials

Abstract

Structural degradation is the main challenge of Nickel-rich cathodes, leading to capacity and voltage fading, especially at high cut-off voltages. Herein, LiNi 0.94-x Co 0.06 Mg x O 2 (x = 0, 0.01, 0.02) samples have been prepared by high-temperature solidstate reaction method. The effects of Mg doping on its crystalline structure, and electrochemical performance have been studied by various characterizations analysis. We notice that Mg doping can not only tighten the structure/interface stability of the cathode, but also accelerates the Li + diffusion, thereby significantly achieving its high voltage/cycle stability. High-voltage (4.5 V) electrochemical results show that Mgdoped LiNi 0.94 Co 0.06 O 2 (1 % Mg) can achieve a high reversible capacity of 217.5 mAh g À 1 at 0.2 C, high cycle retention rate of 80.5 % after 100 cycles at 0.2 C, inhibits average voltage decay, suppress resistance rise and boosted rate performance. Our work provides a solid strategy for improving the structure and voltage decay of nickel-rich cathode materials for future highenergy lithium-ion batteries.

Judicious Design of Electrode Materials for Highly Efficient Lithium-Ion Batteries

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2D MXenes Nanosheets for Advanced Energy Conversion and Storage Devices: Recent Advances and Future Prospects

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“…Researchers have been motivated for developing energy storage technologies in response to these constraints that possess crucial characteristics such as exceptional cycling performance, high‐energy and power densities. Significant focus has been directed towards electrochemical energy storage (EES) mechanisms, including rechargeable batteries (RBs) and supercapacitors (SCs) due to their extensive application in portable electronic devices such as smartphones, tablets, multi‐media players, and medical equipment [1,2, 14, 31–37] . Figure 1 presents the Ragone plot, which provides a comparison between RBs and SCs in relation to their energy/power density.…”

Telluride‐Based Materials: A Promising Route for High Performance Supercapacitors

“…[31][32][33] Consequently, SCs are an appropriate alternative to batteries for applications that require rapid energy delivery and uptake, such as electric traction, aerospace, and portable electronics. [34][35][36][37][38][39] Carbons, metal oxides, selenides, nitrides, carbides, sulfides, and phosphides are some of the many materials investigated for their potential in electrochemical energy storage devices. [40][41][42][43][44][45][46][47] The properties of metal chalcogenides (MCs) make them ideal candidates for in-depth research as electrode material for SCs.…”

“…In contrast to batteries, SCs demonstrate superior power density, durability, charging rate, and eco‐friendliness [31–33] . Consequently, SCs are an appropriate alternative to batteries for applications that require rapid energy delivery and uptake, such as electric traction, aerospace, and portable electronics [34–39] …”