Recent Progress in Capacity Enhancement of LiFePO4 Cathode for Li-Ion Batteries

Abstract

LiFePO4 (lithium iron phosphate (LFP)) is a promising cathode material due to its environmental friendliness, high cycling performance, and safety characteristics. On the basis of these advantages, many efforts have been devoted to increasing specific capacity and high-rate capacity to satisfy the requirement for next-generation batteries with higher energy density. However, the improvement of LFP capacity is mainly affected by dynamic factors such as low Li-ion diffusion coefficient and poor electrical conductivity. The electrical conductivity and the diffusion of lithium ions can be enhanced by using novel strategies such as surface modification, particle size reduction, and lattice substitution (doping), all of which lead to improved electrochemical performance. In addition, cathode prelithiation additives have been proved to be quite effective in improving initial capacity for full cell application. The aim of this review paper is to summarize the strategies of capacity enhancement, to discuss the effect of the cathode prelithiation additives on specific capacity, and to analyze how the features of LFP (including its structure and phase transformation reaction) influence electrochemical properties. Based on this literature data analysis, we gain an insight into capacity-enhancement strategies and provide perspectives for the further capacity development of LFP cathode material.

Crosslinked Chitosan Binder for Sustainable Aqueous Batteries

“…For this reason, electrodes with the lowest amount of EDC (0.5 and 0.1 equivalents) were tested in LP30. Compared to the aqueous electrode, after the first cycles, the capacity values stabilized at 125 mAh/g, which is not far from those of commercial electrodes (150 mAh/g) [35]. An increase in specific capacity values over cycling, visible in Figure 9b, occurred due to a gradual wetting of the electrodes.…”

Carbon-Coatings Improve Performance of Li-Ion Battery

“…NCA (LiNi x Co y Al 1-x-y O 2 ) is a promising alternative for next generation LIB with high energy density. The advantages of high reversible specific capacity, high cyclic stability, low cost and structure stability because dopant (aluminum) make it successfully applied in electric vehicles including Tesla Mode 3 [ 94 ]. LiNi 0.80 Co 0.15 Al 0.05 O 2 (NCA8115), one of the most common NCA cathode material, could achieve a specific capacity of 265 mAh g −1 with high specific energy of about 200 mAh g −1 , and it was reported the practical capacity could reach about 199 mAh g −1 , which was higher than that of LiCoO 2 at an average voltage of 3.7 V [ 95 ].…”

Rate Capability of LiFePO4 Cathodes and the Shape Engineering of Their Anisotropic Crystallites

“…Various analytical methods are used to describe Q(t): Peukert's rules [1], Lebenov's [2], hyperbolic functions [3], taking into account the structural and electrochemical parameters [4][5][6][7][8][9][10]. These are important specialized tools for improving the electrode, the component and the battery technology in general [11][12][13].…”