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OPPORTUNITIES AND CHALLENGES WITH
LITHIUM-ION BATTERIES

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Current state of lithium-ion batteries and issues

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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)

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Energy density of existing Lithium-ion battery

  • 240 Wh/kg

  • 670 Wh/L

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Scientists worldwide have been trying to improve the energy density using silicon as anode, but cannot solve the problems of:

  1. Large particle volume expansion (300%) during lithiation

  2. Particle pulverization

  3. Structural collapse of electrode

  4. Poor cycle performance

 

OUR SOLUTION

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.

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Insides of a Lithium-ion Battery

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Working of a Lithium-ion Battery

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 Lithium-ion Battery Production  

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The graphite is expected to be replaced by Si+ in percentages from 5% up to 100%.

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The production process in replacing graphite with Si+ is the same. Our product can therefore be applied immediately in the commercial market.

 
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PERFORMANCE OF Si+ IN LITHIUM-ION BATTERIES

Cathode

Anode

Volumetric energy density

(Wh/L)

Gravimetric energy density
(Wh/kg)

LCO

Graphite

497.8

194.78

LCO¹

Si+

762.8 (+53%)

254.5 (+30%)

NCA²

Graphite

676.5

254.5

NCA³

Si+

897.7 (+33%)

321.9 (+27%)

1: Performance certified by Intertek Testing Services (ITS)

2: Performance of Panasonic NCR18650B battery, the world-leading battery.

3: Calculated battery improvements using Si+

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 Si+ in powder form 

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 Si+ anode 

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 Si+ 18650 battery