Solid-state batteries are often described as the "next big thing" for EVs. Should you wait for them before buying an electric car?
What Are Solid-State Batteries?
Current Batteries (Lithium-Ion)
Today's EV batteries use liquid electrolyte:
Solid-State Batteries
Instead of liquid, they use solid electrolyte:
Promised Advantages
What Solid-State Could Offer
| Benefit | Improvement |
|---|---|
| Energy density | 2-3x more energy per kg |
| Charging speed | Potentially 10-15 minute full charge |
| Safety | No flammable liquid |
| Lifespan | Potentially longer cycle life |
| Weight | Lighter for same capacity |
| Range | 500-600+ miles possible |
In Practice
| Promise | Reality |
|---|---|
| 2x range | Possible but not guaranteed |
| 10-min charge | Requires new infrastructure too |
| Safer | Already rare fires, incremental benefit |
| Cheaper | Initially more expensive |
When Will They Be Available?
Manufacturer Timelines
| Company | Promised Date | Notes |
|---|---|---|
| Toyota | 2027-2028 | Most aggressive timeline |
| BMW | 2030 | Partnership with Solid Power |
| Mercedes | 2030+ | Development ongoing |
| VW | Late 2020s | QuantumScape partnership |
| Nissan | 2028 | Pilot production |
Historical Context
Solid-state has been "5 years away" for 15+ years:
Realistic Assessment
| Milestone | Likely Timeline |
|---|---|
| First production vehicles | 2027-2029 |
| Wide availability | 2030-2033 |
| Price parity with lithium-ion | 2033-2035+ |
| Dominant technology | 2035+ |
Should You Wait?
The Waiting Game Problem
If you wait for perfect technology, you'll wait forever:
| Year | "Wait for" |
|---|---|
| 2018 | Better range |
| 2020 | Cheaper EVs |
| 2022 | Better charging |
| 2024 | Solid-state |
| 2026 | ??? |
What You'd Miss
Waiting 5 years for solid-state means:
| Factor | Impact |
|---|---|
| Fuel savings | £5,000-10,000 lost |
| Running cost savings | £3,000-5,000 lost |
| Environmental benefit | 5 years of emissions |
| EV experience | Learning curve delayed |
Current Technology Is Already Excellent
| What Today's EVs Offer | Performance |
|---|---|
| Range | 250-400 miles |
| Fast charging | 10-80% in 18-30 mins |
| Battery life | 80%+ after 8-10 years |
| Safety | Lower fire risk than petrol |
Question: Do you need better than this for your daily use?
What's Improving Without Solid-State
Near-Term Improvements (2024-2028)
| Technology | Benefit | Timeline |
|---|---|---|
| LFP chemistry | Cheaper, longer-lasting | Now |
| Silicon anodes | 20-40% more range | 2025-2027 |
| 800V architecture | Faster charging | Now (some cars) |
| Cell-to-pack design | More efficient packaging | Now |
| Sodium-ion | Cheaper, lower range | 2025-2027 |
Charging Infrastructure
| Improvement | Timeline |
|---|---|
| More 350kW chargers | Now/ongoing |
| Better charger reliability | Improving |
| More locations | Rapidly expanding |
When Waiting Makes Sense
Wait If:
Don't Wait If:
The Financial Reality
Cost of Waiting
Scenario: Current petrol car vs buying EV now
| Factor | Keep Petrol 5 Years | Buy EV Now |
|---|---|---|
| Fuel cost | £8,000 | £1,500 |
| Maintenance | £2,500 | £500 |
| Road tax | £1,000 | £0 |
| Total | £11,500 | £2,000 |
Difference: £9,500 more expensive to wait.
Even If Solid-State Is Better
In 2030, you could sell your current EV and upgrade:
Expert Consensus
What Analysts Say
Most industry experts recommend:
What Manufacturers Do
Interesting indicator: EV manufacturers are investing billions in current lithium-ion production, not waiting for solid-state.
Summary
| Question | Answer |
|---|---|
| Will solid-state be better? | Probably yes, eventually |
| When will it be affordable? | 2030-2035+ |
| Should you wait? | Probably not |
| Is current tech good enough? | Yes, for most people |
| What's the cost of waiting? | £5,000-10,000 in running costs |
The Bottom Line
Solid-state batteries are promising but uncertain. They might arrive in 2028, or 2035, or encounter further delays. History shows battery "breakthroughs" often take longer than promised.
Meanwhile, today's EVs:
Our recommendation: If you need a car, buy an EV now. If solid-state arrives and is transformative, sell and upgrade. You'll have saved money in the meantime and won't have waited for something that might not materialise as promised.
The best time to go electric was 5 years ago. The second-best time is now.