because:
- Li-S batteries can hold several times more energy than Li Ion batteries today (2x-5x)
- Li-S batteries would weigh less
- Li-S batteries don’t require expensive and rare cobalt, and instead use cheap and abundant sulfur

The previous roadblock was that because of some technical chemistry mumbo jumbo about how much sulfur expands and contracts, the Li-S batteries only had a lifespan of something like 150 recharge cycles (compared to like 1500 for Li-ion). But these researchers found that adding sugar to the structure got the recharge cycles up to around 1000- getting very close to commercial viability.