why doesn't current flows from positive to negative terminal inside an battery, inatead follows the path of circuit?

Current always flow from positive terminal of the battery to the negative terminal. 

Kindly refer to the link given below to know about the same.​

https://www.meritnation.com/ask-answer/question/in-an-electric-circuit-if-the-flow-of-electrons-is-from-neg/electricity/5811292