You have been redirected to your local version of the requested page
Request quote

Lithium iron phosphate (also known as LiFePO4 or lfp) batteries last for over 2000 charges and are safer because of their lower risk of overheating. LiFePO4 batteries have a slightly lower energy density compared to lithium-ion batteries. However, high discharge rates of lfp batteries make them ideal for electric vehicles, renewable energy storage, and backup power systems. Lithium iron(II) phosphate is used as a cathode material in lithium iron phosphate batteries. Characterization of lfp and monitoring the oxidation state of iron in lfp batteries is relevant to battery performance in terms of durability, capacity, and safety. Additionally, analyzing chemical composition can be useful for battery research and can aid eco-friendly recycling practices. This is essential for driving battery technology forward and promoting clean energy solutions.

Polarographic speciation of Fe(II) and Fe(III) can be used to evaluate the purity of LiFePO4 and its usability as a cathode material in lithium iron phosphate batteries. It can further be used to study the concentrations of Fe(II) and Fe(III) in the cathode material after several charging and discharging cycles to evaluate the aging behavior.

Pure LiFePO4

884 Professional VA manual for MME.
Figure 1. 884 Professional VA manual for MME.

The lfp sample is weighed, mixed with degassed diluted sulfuric acid, heated at 85 °C for 15 minutes, and then cooled. Afterward, the digested sample solution is added to the measuring vessel that contains 20 mL degassed electrolyte. Quantification is done using two standard additions with separate Fe(II) and Fe(III) solutions.

Table 1. Parameters
Parameter Setting
Mode DME
Start potential 0.0 V
End potential -1.5 V
Sweep rate 30 mV/s
Peak potential Fe(II) -0.25 V
Peak potential Fe(III) -0.8 V
  • Multi-Mode Electrode pro
Determination of Fe(II) and Fe(III) in digested lithium iron phosphate with the Multi-Mode Electrode pro.
Figure 2. Determination of Fe(II) and Fe(III) in digested lithium iron phosphate with the Multi-Mode Electrode pro.

The viva software delivers unmatched versatility and flexibility by automating data conversion and displaying data in different formats to save time and reduce the risk of errors. Table 2 shows how viva effortlessly translates concentrations from g/L to mg/g of tested material, enhancing understanding of the results for inexperienced users.

Table 2. Result
Sample Fe(II) (g/L) Fe(III) (g/L)
Digested LiFePO4 2.8 0.09

 

Sample Fe(II) (mg/g) Fe(III) (mg/g)
LiFePO4 350 11
Contact

Metrohm USA

9250 Camden Field Pkwy
33578 Riverview, FL

Contact

Internal reference: AW VA CH4-0543-112015