Review on Defects and Modification Methods of LiFePO₄ Cathode Material for Lithium-Ion Batteries

Abstract

In recent years, domestic and international researchers have been committed to the research of lithium-ion batteries. As the key to further improving the performance of the battery, the quality of the cathode material directly affects the performance indicators of the lithium battery; thus, the cathode material occupies the core position in the lithium-ion battery. LiFePO4 is a relatively excellent material for lithium-ion batteries, which has many advantages of low cost, high capacity, and environmental friendliness. However, as a result of the low conductivity of lithium iron phosphate and the slow diffusion rate of lithium ion, the development of lithium iron phosphate in the power battery industry is restricted. As a power battery applied in real life, there is still a lot of research space in energy density, consistency, and low-temperature performance. After years of efforts, researchers continue to explore the charging and discharging principle of lithium iron phosphate, to optimize the synthesis route, and to try coating, doping modification, and other methods to improve the performance of the material. This paper analyzes and summarizes the defects of lithium iron phosphate cathode materials and modification methods and provides an outlook on the future research direction of lithium iron phosphate.

Exploiting the Steric Effect and Low Dielectric Constant of 1,2-Dimethoxypropane for 4.3 V Lithium Metal Batteries

“…Figure a demonstrates the full cell performance of the DMP electrolyte in a Li|LiFePO 4 (LFP) coin-cell with 40 μm thick Li foil. It is worth noting that LFP has recently been in the spotlight as a competitive cathode material by virtue of its excellent cyclability, thermal stability, low cost, and environmental friendliness. , After 385 charge/discharge cycles at C/2, 97.7% of its initial capacity was retained with the 2 M LiFSI-in-DMP electrolyte, whereas the cell with 2 M LiFSI-in-DME ceased to operate after 230 cycles. Furthermore, full cells with 40 μm thick Li foil and high voltage NCM811 cathodes (∼4.3 V vs Li/Li + ) clearly delivered superior cycling performance with 2 M LiFSI-in-DMP compared to its DME counterpart (Figures b,c and S11).…”

Revealing the Ultrahigh Rate Performance of the La and Ce Co-doping LiFePO4 Composite

“…Therefore, the kinetics of ion transport are further influenced . In a comparison of electrochemical properties modified with Li site and O site doping, Fe site substitution with metal elements is more effective owing to the diverse selection of metal elements and easy substitution. , Besides, the active materials present low cell internal resistance and enhanced Li-ion diffusion rate and capacity retention after being modified at the Fe site than other positions. Thus, various single dopants (Mg, Mn, Sm, Zn, etc.)…”

A Review on Electrode Materials of Fast‐Charging Lithium‐Ion Batteries

“…[47] Although many advantages of nanoscale structural design strategy, there are some shortcomings of nanoscale active materials. First, nanoscale active materials are easily to form agglomerations which are difficult to uniform mix with binder, 6.3 × 10 À 5 57 100 mAh g À 1 at 10 C 159 mAh g À 1 at a 0.5 C after 50 cycles PAQS-6 wt % FGS [31] 2.9 × 10 À 5 64-75 150 mAh g À 1 at 10 C / LiCoO 2 [32] / / / 144.8 mAh g À 1 at 0.2 C after 40 cycles LiCoO 2 -200 [33] / / 90 mAh g À 1 at 10 C 106 mAh g À 1 at 0.5 C after 500 cycles LiCoO 2 -CNTs [34] 3.8 × 10 2 91 137.4 mAh g À 1 at 2 C 150 mAh g À 1 at 0.1 C after 50 cycles LiFePO 4 [35] 3.7 × 10 À 9 29 49 mAh g À 1 at 1 C / Pristine LiFePO 4 [36] 10 À 9 -10 À 10 � 6 22 mAh g À 1 at C/30 / Li 1-x M x FePO 4 [36] > 10 À 2 � 41 82 mAh g À 1 at 10.8 C /…”