There are some very strong arguments why hydrogen (used in a fuel cell EV) does not make sense as a short, medium or long-term solution. The most fundamental argument is that hydrogen is an energy carrier, not a fuel, since it requires energy inputs to “refine” into pure hydrogen from water or natural gas (it cannot be mined, like oil, coal or gas). Since the energy to create hydrogen for use in a fuel cell can be more efficiently transmitted and stored in a battery for use in a EV drivetrain, it will never make sense to pursue hydrogen since the energy is always better used in a battery electric vehicle (so the argument goes).
The problem with this argument is that it is a technical argument and it ignores the consumer psychology side of the equation. I’m not saying the argument is wrong, I’m just saying to really understand the persistent attractiveness of hydrogen, you can’t underestimate the consumer appeal of the overall system relative to a battery electric vehicle. At a minimum, proponents of EVs must understand this because it offers very important lessons and conclusions for where EVs must evolve to gain broad adoption.
Why, battery proponents must ask, does the public and consumer appeal of hydrogen persist so stubbornly?
Simple: The idea of being able to refill the tank in a matter of a few minutes is a very strong consumer benefit—one that is deeply embedded from decades of pouring extremely energy dense gasoline into our gas tanks. In our hectic lives today, even the four or five minutes it takes me to fill my tank at the gas station at the corner seems like an eternity.
I believe that this issue is acknowledged by the battery EV community but the importance and impact is vastly underestimated. Recharge time is the single most important barrier to customer adoption of EVs in the long run, not range.
One reason is that as long as recharging a battery pack (in practical, readily available locations) takes hours and not minutes, it is a major shift in consumer psychology for a driver to accept the fact that when the battery is depleted they are essentially down for the count. Even getting the charge time down to one hour or 30 minutes will not be quick enough to be practical and acceptable for broad consumer usage. Enthusiasts will plan lunch stops around the one hour charge during a road trip, but it won’t be practical for daily use.
Another reason is that range becomes less important as quick charge becomes more readily available.
Imagine a future scenario where the energy density improves to enable 500 miles on a single charge and the infrastructure for quick charging exists. The availability of practical quick charging will mean that no one will need to carry the weight and incur the cost of the additional batteries for the full 500 mile range. Put another way, if the infrastructure for quick charging exists, improvements in energy density will result in cars with fewer batteries (resulting in less weight and less cost) to achieve the same distance between refills.
So my conclusion is that EV companies, battery companies and utilities must innovate in the area of quick charge and infrastructure development if EVs are to gain broader adoption. It will be more important than innovating on increasing the maximum range of EVs.
(Note: The tradeoff that is implicit in my argument is that battery chemistries that tend to have better rapid charge capability and cycle life also tend to have lower energy density. High energy cells tend to have shorter cycle life and less ability to handle a quick charge. This is true today and has been true for a while, but perhaps we will have a breakthrough in the future that is the best of both worlds.)
Daryl Siry is the former chief marketing officer for Tesla Motors. He now consults on marketing and the automotive industry. You can read more here: http://darrylsiry.blogspot.com.
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