Rung 1
Graphite
+15%
volumetric energy density · cell level
Costs more than the density gain returns — not yet economic.
One prelithiation process · graphite, composite & pure-silicon anodes
01HypSi™ · Prelithiated silicon anodes
More range. More runtime. Same cell line.
Up to +40–45% volumetric energy density on pure-silicon cells — prelithiated inline in 70 seconds, qualified on your cell, your duty cycle, your line.
+40–45%
volumetric energy density · pure silicon
80→95%
first-cycle efficiency · how it works
70 sec
15% dose · drop-in, no line redesign
HypSi™ process · 70 secInline · Roll-to-roll
t = 0 sStandard silicon anode enters module
t = 35 sElectrochemical Li transfer under pressure
t = 70 sBattery-ready HypSi™ anode · stable from cycle one
LCO
compatible
LFP
compatible
NMC
compatible
02The problem
Graphite is maxed out. Silicon fails at scale.
Silicon holds roughly 10× the anode capacity of graphite — but volume expansion, cracking and yield loss break it in production. Up to ~25% of lithium is lost in the first cycle. That capacity is gone forever.
~10×
silicon anode capacity vs. graphite
~25%
first-cycle lithium loss (ICL)
80%+
of global anode/graphite output is China-controlled
China controls 80%+ of global anode and graphite production. Europe needs an alternative — not another dependency.
03The solution · HypSi™
Prelithiation makes standard silicon work.
HypSi™ compensates first-cycle lithium loss and stabilizes the electrode from cycle one. It is the enabling step for standard-silicon anodes.
- Electrochemical, under pressure
Places the silicon anode in contact with lithium and drives lithiation fast under controlled pressure.
- Industrial speed
70 seconds for a 15% prelithiation dose on a pure silicon anode.
- Inline or offline
Non-hazardous and integrates into existing production lines — no new line.
- Chemistry-agnostic
Works with LCO, LFP and NMC.
- 1Step 01Slurry mixing
- 2Step 02Coating
- 3Step 03Drying
- 4Step 04Calendering
- 5Step 05HypSi processInline or standalone · 70 sec
- 6Step 06Slitting
- 7Step 07Cell assembly
Standard silicon anode in → HypSi™ process → battery-ready HypSi™ anode, stable from cycle one.
04How far you can go
One process. A ladder of energy density.
The same prelithiation step lifts every anode — but the gain, and the economics, climb with silicon content. Pure silicon is the destination.
Rung 2
Composite (Si / graphite)
+15%
volumetric energy density · cell level
At least break-even on cost today.
Rung 3
Pure silicon — HypSi™
+40–45%
volumetric energy density · cell level
Invest €12, save €15 per kWh — profitable.
Volumetric energy density · cell levelToday's graphite cell = 100
Graphite cell, today—
100
+ prelithiation · graphite or composite+15%
115
+ prelithiation · pure silicon (HypSi™)+40–45%
163
The economics
Prelithiation profitability depends on anode and cathode — here is the overview.
Anode \ Cathode
NMC
LFP
Pure silicon (HypSi™)
NMC:Very high
LFP:High
Composite
NMC:High
LFP:Break-even
Graphite
NMC:Break-even
LFP:Difficult
Profitability of prelithiation — qualitative assessment. Volumetric energy density, cell level.
05Proof
Proven, not promised.
Data, not adjectives. Every figure below is measured.
>500 cycles
demonstrated, stable capacity
LFP / pre-doped Si · A/C = 4 · >1000 cycles under test
336 Wh/kg
demonstrated full cell
NMC811 / pre-doped Si · NEDO 2024
>350 Wh/kg
roadmap target
Target — separate from the 336 Wh/kg demonstrated
1.7×
flight time, same cell weight
Drone prototype · LCO / pSi
<10% / ~2%
initial loss / degradation
vs. rapid failure for standard silicon
TRL 5–6
today
Next milestone TRL 6, then pilot line
Cycle stability — capacity retentionX: cycles · Y: capacity %
06Who it's for
We start where volumetric energy density is mission-critical.
- Cell manufacturers
Graphite / silicon blends — add prelithiation, no new line.
- Silicon-anode material producers
Increase the value of the product you already sell.
- Li-ion capacitor producers
Prelithiation is mandatory — a large, untapped market.
eVTOL
Range that closes the route
Drones
1 g = 1 min flight time
Robotics
A full shift between charges
Mobility
EV & motorsport edge
07Go to market
We go where the cells are made.
Our prelithiation step plugs into the battery supply chain two ways — installed on-site at the cell assembly line, or delivered to it as ready material. The process travels to the customer.
01 · On-site
At the assembly line
We install our prelithiation line inline with the cell maker's existing assembly line. Standard silicon anode in, HypSi™ out — no shipped intermediates, no new logistics.
02 · Delivered
Delivered to the line
Or we prelithiate centrally and ship ready material to cell makers — they run their existing lines unchanged. One source reaches many producers, fast.
Either model earns a recurring per-kWh licence — revenue wherever cells are made, without owning a lithium supply chain.
08Why we win
Japanese science. European industrialization. Global scale.
Foundational IP
Foundational technology exclusively licensed. Patents granted in JP, US and CN; EP pending; plus PCT applications.
Built for Europe
Japanese science, European industrialization, global scale — no China dependency, aligned with EU funding priorities.
Capital-efficient
Asset-light: we source standard silicon anodes and prelithiate them — no full-factory capex.
09Team
A Japanese inventor's breakthrough. A European commercial team.
75+ years combined experience. One mission: make it scale.
- →Dr. Satoh MasaharuCTOInventor · PhD Electrochemistry
- →Nobu TanakaCMOInternational marketeer
- →Markus SchiemannCEOBusiness developer
- →Klara VandenboschAdvisoryLeadership & organizational scale-up
—FAQ
Prelithiation, answered.
The questions we hear most from cell makers, OEMs and investors. See the full FAQ for the complete list.
- What is electrochemical prelithiation?
- Electrochemical prelithiation pre-loads lithium into a silicon anode before the battery is assembled, using controlled contact with a lithium source under pressure. 70.energy's HypSi™ process does this inline in about 70 seconds for a 15% dose, compensating the lithium a silicon anode would otherwise lose on its first cycle.
- How do you fix first-cycle lithium loss in silicon anodes?
- Silicon anodes lose up to ~25% of their lithium on the first charge while forming the solid-electrolyte interphase (SEI). HypSi™ prelithiation replaces that lithium up front, raising first-cycle efficiency from about 80% to 95% and keeping the cell stable from cycle one, so the battery ships at full capacity.
- Does HypSi™ require a new production line?
- No. HypSi™ is a drop-in prelithiation step that integrates into an existing cell-assembly line — no line redesign. 70.energy can install it on-site inline with the cell maker's line, or prelithiate centrally and deliver ready material that cell makers run on their existing lines unchanged.
- Which cathode chemistries is HypSi™ compatible with?
- HypSi™ is chemistry-agnostic and works with LCO, LFP and NMC cathodes. It supports graphite, silicon-graphite composite and pure-silicon anodes with the same process step.
- How much energy density does prelithiation add?
- On pure-silicon cells, HypSi™ delivers up to +40–45% volumetric energy density at cell level versus a graphite cell today — or roughly −10% weight for the same energy. On graphite or composite anodes the gain is about +15%.
- Is silicon-anode prelithiation economic versus graphite?
- On pure silicon, yes: the economics are profitable — roughly invest €12 to save €15 per kWh. On composite anodes prelithiation is at least break-even today; on plain graphite it currently costs more than the density gain returns. Profitability climbs with silicon content and depends on the anode/cathode pairing.
- What does 70.energy do?
- 70.energy is an integration partner for silicon-anode performance. Its HypSi™ electrochemical prelithiation process makes standard silicon anodes work at industrial scale, delivering +20% energy or −10% weight, qualified inline in 70 seconds on an existing cell line — with no China dependency in the anode supply chain.
10Talk to the team
Silicon defines the next generation of Li-ion batteries and capacitors. We make it industrial.
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