OPPORTUNITIES AND CHALLENGES WITH
Current state of lithium-ion batteries and issues
Charging to store electrical energy
Lithium-ion migrates from cathode to anode
Graphite is currently conventional anode material
Graphite consists of around 24wt% of the whole battery due to low capacity (372 mAh g⁻¹)
Energy density of existing Lithium-ion battery
Scientists worldwide have been trying to improve the energy density using silicon as anode, but cannot solve the problems of:
Large particle volume expansion (300%) during lithiation
Structural collapse of electrode
Poor cycle performance
Our solution is to replace the current anode material of
Lithium-ion batteries (or ‘negative charge’) with Si+.
Due to the thinness of the Si+ material, more cathode material can be ‘rolled’ into the battery, thereby increasing the capacity from 250Wh/kg to ~350Wh/kg of the battery.
Insides of a Lithium-ion Battery
Working of a Lithium-ion Battery
Lithium-ion Battery Production
The graphite is expected to be replaced by Si+ in percentages from 5% up to 100%.
The production process in replacing graphite with Si+ is the same. Our product can therefore be applied immediately in the commercial market.
PERFORMANCE OF Si+ IN LITHIUM-ION BATTERIES
Volumetric energy density
Gravimetric energy density
1: Performance certified by Intertek Testing Services (ITS)
2: Performance of Panasonic NCR18650B battery, the world-leading battery.
3: Calculated battery improvements using Si+