First of all, the safety performance still needs to be improved, a lithium battery stabbed that is 100% catastrophic consequences, explosion! And burn!! In particular, the larger the capacity, the more powerful the explosion; In fact, the development of high security lithium battery is not impossible, but the first is your measures really greatly improve safety? Can you handle many situations and still be safe? This power is not less than a time bomb, in the cost, although lithium battery life, durable, but the cost is not low, especially with a variety of security measures after the estimated price is unacceptable Secondly, the cost driven consciousness of capitalists, namely lithium electricity is more expensive than lead electricity, although it is more environmentally friendly and efficient, people will not be willing to spend more money to buy a car for "environmental protection".