Comparison of the effects of FePO4 and FePO4·2H2O as precursors on the electrochemical performances of LiFePO4/C

Zhou, Dan; Qiu, Xuechao; Liang, Feng; Cao, Shan; Yao, Yaochun; Huang, Xiaopeng; Ma, Wenhui; Yang, Bin; Dai, Yongnian

doi:10.1016/j.ceramint.2017.07.023

Cited by 32 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accordingly, the calcination could markedly enhance the crystallinity of prepared FePO 4 , which demonstrated a positive relation with the calcination temperature in the XRD patterns in Figure a. In FTIR profiles displayed in Figure b, the antisymmetric stretching mode in the 1000–1200 cm –1 and 400–560 cm –1 regions in all samples referred to PO 4 . − However, the strong bands at around 3410 and 1633 cm –1 observed in pre-500FP respectively referring to the bending vibration and stretching vibration absorption generated by water implied that its structure might be unstable for water could be reabsorbed after the heat treatment, resulting in an adverse influence on the in situ synthesis of LiFePO 4 . Bands involving water could be hardly observed in the samples precalcinated at 600 and 700 °C, indicating the strong stability and purity of FePO 4 .…”

Section: Resultsmentioning

confidence: 89%

“…Zhong and Zhou 37 confirmed that LiFePO 4 /C synthesized by trigonal anhydrous FePO 4 had improved electrochemical performance on account of the single-phase structure and small particle size. Zhou et al 38 found that the rate performance of LiFePO 4 /C obtained from anhydrous FePO 4 was better than that of hydrous FePO 4 for a more uniform carbon coating achieved relying on the smaller particle size. Hence, precalcinating a hydrous precursor to dehydrate is beneficial to enhancing the electrochemical performance of LiFePO 4 , but the calcine temperature regulation also has a great effect on the crystallinity, morphology, and other characteristics of FePO 4 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO₄/C Cathode Material

Zhang

Lin

2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Determining the impact of precursor properties is essential for the performance regulation of LiFePO4 cathode material prepared by carbothermic reduction. In this study, FePO4 with different crystallinities, as precursors, was obtained at various precalcinating temperatures and reduced to form LiFePO4/C to quantitatively investigate crystallinity’s influence. The characterization and molecular dynamics (MD) simulation results showed that the crystallinity of FePO4 increased markedly with a higher dehydration temperature, while excessive sintering would occur at 700 °C, resulting in a severe particle aggregation. The electrochemical analysis manifested that FePO4 crystallinity would not affect the cyclic stability of cathode materials, but a moderate dehydration temperature of the precursor could equip LiFePO4/C with the best performance via an excellent balance between crystallinity and charge transfer. The excessive sintering and low crystallinity both brought about obvious reduction to the discharge capacity of LiFePO4/C such that the discharge capacity at a 0.1 C rate would decrease from the optimum of 151.8 mAh·g–1 to less than 121.0 mAh·g–1 and 141.0 mAh·g–1 for the precursors calcinated at 500 and 700 °C, respectively. Our work provides a clear understanding of the non-negligible role of FePO4 crystallinity and a valid direction for the control of the electrochemical performances of LiFePO4.

show abstract

Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO₄/C Cathode Material

Zhang

Lin

2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The market volume of LiFePO 4 batteries was forecast to increase after BYD Company launched the "blade battery", based on the cell-to-pack technology, in 2020, further increasing the demand for such batteries [2, 5,6]. The LiFePO 4 precursor is one of the most important factors determining the performance of LiFePO 4 batteries [7]. FePO 4 is widely used as a LiFePO 4 precursor owing to its low cost, higher oxidative stability, and superior low-temperature performance compared to other precursors such as iron(II) oxalate, iron(II) acetate, and Fe(OOCCH 3 ) 2 [8,9].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Utilization of Fe(Ⅲ) Isolated from Laterite Hydrochloric Acid Lixivium via Ultrasonic-Assisted Precipitation to Synthesize LiFePO4/C for Batteries

Xu,

Tan,

Zhu

et al. 2024

Materials

View full text Add to dashboard Cite

Ultrasonic-assisted precipitation was employed to sustainably isolate Fe in the hydrochloric acid lixivium of low-grade laterite for the synthesis of battery-grade iron phosphate. The recovery efficiency of Ni and Co exceeded 99%, while the removal efficiency of the Fe impurity reached a maximum of 95%. Precipitation parameters for the selective isolation of Fe (MgO precipitant, pH 1, 70–80 °C) were optimized and used in ultrasonic precipitation experiments. The use of ultrasonic waves in the precipitation process enhanced micromixing by reducing the size of primary grains and mitigating particle agglomeration, thereby significantly improving the purity of the isolated compound and providing high-quality iron phosphate (FePO4·2H2O). The LiFePO4/C composite prepared from as-precipitated FePO4 exhibited excellent electrochemical performance, with a discharge capacity of 149.7 mAh/g at 0.1 C and 136.3 mAh/g at 0.5 C after 100 cycles, retaining almost 100% cycling efficiency. This novel and facile method for iron removal from laterite acid lixivium not only efficiently removes excess iron impurities leached due to the poor selectivity of hydrochloric acid, but also enables the high-value utilization of these iron impurities. It enhances economic benefits while simultaneously alleviating environmental pressure.

show abstract

Iron phosphate nanoparticles as an effective catalyst for propargylamine synthesis

Drici

Berrichi

Bachir

et al. 2023

Reac Kinet Mech Cat

View full text Add to dashboard Cite

Comparison of the effects of FePO4 and FePO4·2H2O as precursors on the electrochemical performances of LiFePO4/C

Cited by 32 publications

References 31 publications

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO₄/C Cathode Material

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO₄/C Cathode Material

Sustainable Utilization of Fe(Ⅲ) Isolated from Laterite Hydrochloric Acid Lixivium via Ultrasonic-Assisted Precipitation to Synthesize LiFePO4/C for Batteries

Iron phosphate nanoparticles as an effective catalyst for propargylamine synthesis

Contact Info

Product

Resources

About

Comparison of the effects of FePO4 and FePO4·2H2O as precursors on the electrochemical performances of LiFePO4/C

Cited by 32 publications

References 31 publications

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO4/C Cathode Material

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO4/C Cathode Material

Sustainable Utilization of Fe(Ⅲ) Isolated from Laterite Hydrochloric Acid Lixivium via Ultrasonic-Assisted Precipitation to Synthesize LiFePO4/C for Batteries

Iron phosphate nanoparticles as an effective catalyst for propargylamine synthesis

Contact Info

Product

Resources

About

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO₄/C Cathode Material

Influence Mechanism of Precursor Crystallinity on Electrochemical Performance of LiFePO₄/C Cathode Material