Lithium Iron Phosphate
IBUvolt® LFP400
Batteriematerial für Lithium-Eisenphosphat-Kathoden
IBUvolt® LFP400 (LiFePO4) is a cathode material for lithium iron phosphate batteries with the highest standards of purity and quality, prepared for industrial use. We have been producing the IBUvolt® LFP400 cathode material since January 2014. Due to the original development for use in an NMC mixture (nickel manganese cobalt), the particle shape and size is very interesting for use in innovative coating processes. Compared to small-particle LFP (LFP402 link), IBUvolt® LFP400 as a powder has good flowability and is less dust-forming.
Easy to process in dry coating and in aqueous solution
High cycle stability for a long service life
Advantageous behavior at low temperatures
As a coarser LFP cathode material, IBUvolt® LFP400 has an average particle size (d50) of approx. 11 µm. Electrodes coated with the material achieve very good specific power (W/g), good volumetric energy density (Wh/L) and excellent cycle life. IBUvolt® LFP400 has been successfully tested for use in stationary storage systems and has proven itself in both aqueous and dry coating processes. In cooperation with customers and industrial partners, our application technology department (link) is constantly investigating new areas of application for this cathode material in which the electrochemical properties offer the greatest advantage.
IBUvolt® LFP400 maintains its capacity over thousands of charging cycles – a comparatively long service life, which reduces the specific costs per charge cycle or kilometer by up to 50 % for a comparable acquisition cost due to a significantly longer operating time! IBUvolt® LFP400 has been successfully tested over 10,000 charge/discharge cycles at a discharge rate of 2C in cylindrical cell format with a nominal capacity of up to 50 Ah.
With an average particle size of 11 µm, IBUvolt® LFP400 is interesting for applications where conventional cathode materials reach their limits, for example for use at low temperatures. At ambient temperatures far below the freezing point, batteries deliver less current than at room temperature because the diffusion processes are significantly slower and the mobility of the lithium ions is reduced. However, the porous structure of IBUvolt® LFP400 enables faster transport of the ions within the pores, so that even at -20 °C sufficient current with an average voltage of 2.8 V is available. We have confirmed these results for IBUvolt® LFP400 through tests in cylindrical cells with 4690 format at low temperatures.
The 4690 battery cell, also known as the 46xx cell, is a cylindrical lithium-ion battery whose dimensions are due to its name. It has a diameter of 46 mm and a height of 90 mm. These cells belong to a new generation of batteries that have been introduced to the e-mobility industry. They are larger than previous models, which enables a higher energy density and more efficient production. Together with our partners, we have developed cell prototypes in this format.
| Cell & Cathode Information | |
|---|---|
Cathode | Lithium Iron Phosphate (LFP400) |
Anode | Synthetic Graphite |
| CAM content | 92% |
| CAM loading | 3 mAh/cm2 |
| Density | 1.7 g/cm3 |
| Electrode thickness | 269 μm |
| Electrical Cell Caracteristics | ||
|---|---|---|
Nominal capacity at 0.2 C, 25 °C | Ah | 13.6 |
Nominal operating voltage | V | 3.2 |
| Charging voltage | V | 3.5 |
Recommended cut-off discharge voltage | V | 2.5 |
| Energy | Wh | 43.5 |
AC impedance (1k Hz) | mΩ | < 1.95 |
| DC resistance (2 s pulse at 4 C 50% SOC) | mΩ | < 4.6 |
| Specific energy | Wh/kg | 127 |
| Energy density | Wh/l | 291 |
| Specific power (5C, 50% SOC) | W/kg | 609 |
| Power density (5C, 50% SOC) | W/l | 1380 |
| Discharge Current | |
|---|---|
Recommended at 25 °C | 13.6 A (1 C) |
Maximum continous at 25 °C | 68 A (5 C) |
Recommended at -20 °C | 2.8 A (0.2 C) |
Maximum continous at -20 °C | 13.6 A (1 C) |
