LFP super strong charging and discharging performance helps 0–100 Km/h acceleration enter 3-second level. Let’s unveil the secret of breaking through material limitations of LFP batteries.
Not inferior to ternary lithium, LFP has excellent charging and discharging performance.
With inherent advantages such as safety and long lifespan, Lithium Iron Phosphate (LFP) batteries surpassed ternary lithium batteries in market share in 2021 and continues to expand. But based on the advantages of charging and discharging speed and its discharging capacity under low temperature, ternary lithium batteries are still used by performance car models.
As the world’s first mass-produced ultra-fast charging LFP battery, the charging and discharging performance of the VREMT 800V battery is no less than that of ternary lithium batteries.
Charging rate reaches 4.5C and 15min of charging can extend the range by more than 500km. Stop by a highway service area for a quick meal, and then the battery can afford a long drive.
Fast charging at all temperatures is not afraid of harsh weather. Charging speed at -10℃ is at least 1/4 faster than similar products.
3-second pulse discharge rate up to 16C, instantly releasing huge kinetic energy. 0-100 Km/h acceleration easily enters the 3-second level, with no decrease in long-lasting acceleration and low power consumption (SOC≥20%) in the mid-and-rear stages, helping ZEEKR 007 become the fastest accelerating midsize sedan globally.
Two major breakthroughs in core technology – strong charging and discharging performance
How does the VREMT 800V battery break through material limitations? Let's start with the charging principle of LFP batteries.
Lithium ions move from the cathode to the electrolyte. After passing through the diaphragm, it re-enters the electrolyte and runs into the negative electrode graphite. At the same time, electrons flow from the positive electrode to the negative electrode through the external circuit, maintaining chemical balance.
If charging is seen as a transfer of energy, lithium ions act as the “truck drivers” responsible for transportation. To achieve efficient charging, we need to achieve the “four major improvements”:
More trucks to accelerate lithium-ion generation;
Higher speed of trucks to increase the speed of lithium-ion movement;
Shorter route so that the lithium-ion transfer path can be shortened;
Wider lane to enhance electronic overcurrent capacity.
VREMT has pioneered lithium-ion acceleration technology, adopting the nano-sized LFP particle design and enhancing reaction activity with composite conductive agents. The number of “departures” sharply increased within a unit of time, allowing more lithium ions participating in energy transportation.
Ultrafast dissociation electrolyte technology is adopted to reduce lithium-ion forward resistance. The “muddy path” is developed into a “highway”, allowing the “trucks” passing at high speed all the way.
Three-layer composite porous membrane is applied to increase the porosity within a unit area. Stopping for parking charge is upgraded to ETC, allowing rapid passage of lithium ions.
Low enthalpy transformation graphite negative electrode material, multi-gradient electrode design and surface low-impedance SEI film are used to reduce the impedance of lithium-ion insertion into the negative electrode, build efficient transmission channels and massive storage space and shorten the lithium-ion transfer path. The winding “mountain road” is turned into an overpass spanning the sky.
However, to maintain chemical balance, electrons need to move as fast as lithium ions. Battery cell structure with dual-rivet post current guide design increases the overcurrent capability by 100%. Like widening a road, the single lane turns into a double one, allowing more electronics running in a higher speed, forming a perfect closed loop.
Similarly, when the battery discharges, lithium ions and electrons both return along the original path. In that way, both types of particles move faster within a given unit of time and the battery discharging performance is also stronger.
In addition, high-voltage high-current fast charging will bring exponential heating to the battery core. Based on the dual-rivet post current guide design, VREMT introduced stacked electrodes with multiple lugs. This design not only enhances security, but also allows the heat to distribute more evenly within the battery core. When the temperature control is more efficient, low temperature charging is faster.
There are physical limitations to material characteristics. There is no limit to technological innovation. Providing the ultimate charging speed and safety, the high-power fast-charging era is coming.