Battery-Electric Vehicles (BEVs) still only make up 2% of all car sales in Japan.YUICHI YAMAZAKI / GettyTesla CEO Elon Musk wants the company to improve its sales in Japan.Despite being a pioneering automaker, the country has been slow to embrace EVs.Japan bet early on hybrids and appears reluctant to move on.Back in 2010, Elon Musk predicted that Japan would become Tesla's largest market outside of the US.But more than a decade later, the EV maker isn't doing as well in the country as Musk had hoped.