I have one of these in my car. It's fucking awesome. In the 30 minutes it takes me to get from work to home, I'll go from 25% to 70%

https://www.amazon.com/Charger-Incipio-Faster-Charge-Charger-Black/dp/B00NDEMAJO

Perhaps you need a 'fast' charger for your car? Yeah, it's money and that sucks, but in theory it should fix your problem.