Why Enevate Energy Cells?
Continuing a long history of battery innovation, Enevate delivers tomorrow’s battery capacity utilizing today’s standard Lithium-ion (Li-ion) ecosystem. Patented breakthrough HD-Energy Technology® delivers 4X the anode energy density than that of conventional Li-ion batteries.
Charge to 90% in 15 minutes and 50% in just over 5 minutes—8X faster than conventional batteries and more than 5X faster than the best “fast-charge” Li-ion batteries. All of this is possible without sacrificing energy density as is normally the case in conventional graphite batteries.
How Does a Lithium-ion Battery Work?
Lithium-ion (Li-ion) batteries offer powerful advantages over other rechargeable (secondary) battery technologies such as NiMH or NiCd:
- They’re lighter than other types of rechargeable batteries of the same size because they’re made of lightweight lithium and carbon.
- They can store much more energy than other rechargeable batteries because lithium is a reactive element.
- They hold their charge with Li-ion battery packs, losing less than 5% charge per month.
- They have no memory effect and can handle hundreds of charge/discharge cycles.
When the battery charges, lithium ions move through the electrolyte from the positive electrode to the negative electrode and react to the carbon. During discharge, the lithium ions move back to the metal oxide from the carbon.
Traditional Li-ion Batteries
Graphite has historically been the anode material of choice for Li-ion batteries. Silicon is an anode material that has been of great interest due to its high gravimetric energy density.
Graphite-dominant Li-ion cells using silicon as an additive are easier to implement, but additive amounts are typically less than 10% and the additives themselves are diluted silicon compounds, such as silicon oxide.
Other silicon-dominant (more than 50% silicon) approaches to date—such as those using silicon wafers and silicon nanowires—are typically difficult to manufacture and offer low material density at the battery cell level.
Enevate’s HD-Energy Technology, a self-standing, silicon-dominant composite anode with more than 70% silicon, charges up to 8X faster and delivers more than 4X the energy density of conventional graphite anode materials in an ultrathin form factor for today’s ultraslim devices.
Enevate’s conductive, silicon-dominant composite film anode is essentially 100% active material that can store lithium and has a high electrical conductivity. This anode enables Enevate to deliver ultrafast charging, high energy density, and long runtimes in its Li-ion batteries.
The new silicon-dominant monolithic composite anode combined with the overall battery cell architecture enables ultrafast charging, high volumetric and gravimetric energy density, structural integrity, and electrical conductivity.
Enevate’s HD-Energy material structure, SEM photo
Ultrathin HD-Energy anode cross section, SEM photo
Using an inexpensive silicon source, Enevate cost-effectively manufactures its own silicon-dominant active anode material film from raw materials for a self-standing, single-particle anode with significantly more than 70% silicon. And we are ISO9001:2008 certified for quality manufacturing practices.
More Technical Details
The HD-Energy Technology anode properties include:
- Silicon-dominant: contains more than 70% silicon
- Gravimetric energy density: ~2800 mAh/g with 1500 mAh/g utilized in cell designs with volumetric and energy densities of ~750 Wh/L, ~300 Wh/kg
- High initial Coulombic efficiency: 93% for anode, ~90% for full cells in high density of anode: 1-1.5 g/cc
- Compatible with existing high volume manufacturing processes (unlike nanowire or silicon wafer silicon-dominant approaches)
The cell construction process used for conventional stacked Li-ion pouch cells is the same process we use today but using a significantly thinner anode due to its 4X higher energy density. And as with conventional stacked Li-ion cells, Enevate cells are put into polymer pouches and then vacuum-sealed for distribution.