Particle Size and Particle-Size Distribution Effects on Li⁺ Extraction/Insertion Kinetics for Li-Rich Mn-Based Oxides

Abstract

A series of Li-rich Mn-based layered material Li1.2Ni0.13Co0.13Mn0.54O2 (LMR) with different particle sizes and particle-size distributions (PSDs) have been successfully synthesized via a combustion method using different manganese sources. The particle size of the N-LMR material prepared using Mn­(NO3)2·4H2O as the manganese source is the smallest, and its PSD range is the narrowest among all of the samples. The unique particle size and PSD have a great influence on the electrochemical kinetics of Li-ion extraction/insertion reactions, leading to enhanced electrochemical performance when used as a cathode material for both the half and full Li-ion cells, especially the specific charge capacity at high current rates. The value of the charge specific capacity will determine the state of charge at the initial discharge stage and then influence the discharge process of these Li-rich Mn-based oxides. The N-LMR electrode delivers an initial discharge capacity of 309.2 mA h g–1 at 0.1C, and the specific capacity can reach up to 208.1 mA h g–1 at 1C. After 140 cycles, the electrode can still maintain 95.6% of its initial specific capacity at 1C. Moreover, the material displays a superior high-temperature lithium storage property at 55 °C and the full cells using N-LMR as the cathode material also show a much better electrochemical performance.

Significant Enhancement of the Capacity and Cycling Stability of Lithium-Rich Manganese-Based Layered Cathode Materials via Molybdenum Surface Modification

“…For the sample LMR, all of the dominant diffraction peaks and apparent splitting peaks of 006/102 and 018/110 of both materials can be indexed to the R-3m space group of the hexagonal α-NaFeO 2 -type layered structure, without an obvious impurity phase [ 35 , 36 ]. The weak superstructure reflections of both materials between 20° and 25° indicate the existence of the Li 2 MnO 3 phase, which is the typical feature of lithium-rich cathode materials, arising from the superlattice ordering of Li and Mn in the transition metal layers of the Li 2 MnO 3 phase [ 37 , 38 , 39 , 40 ].…”

Impact of Structural Flexibility of Amine Moieties as Bridges for Redox‐Active Sites on Secondary Battery Performance

“…For instance, Fang et al. synthesized a series of Li‐rich Mn‐based layered materials (Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 ) with different particle sizes and size distributions and demonstrated that the Li‐ion extraction/insertion kinetics were faster for smaller particles [8a] . Liu et al.…”

Anode Modification of Aqueous Rechargeable Zinc‐Ion Batteries for Preventing Dendrite Growth: A Review

“…[ 4 ] Lithium‐ion batteries (LiBs) were the first commercialized battery in 1991. Undeniably, LiBs have the lowest redox potential (−3.04 V vs the standard hydrogen electrode) and a splendid theoretical capacity (3860 mAh g −1 ), [ 5 ] which have a rapid development and various cathodes, such as Li‐rich cathode material, [ 6 ] LiCoO 2 , [ 7 ] LiFePO 4 , [ 8 ] and LiMn 2 O 4 . [ 9 ] Nevertheless, some issues have occurred in commercialized LiBs because of organic electrolytes.…”