Dead leaves to make 'leaf mould' is a different chemical process, as I understand it, from ordinary 'composting', which uses live, green material that bacteria breed in, generating heat.
I don't think 'leaf mould' generates any heat, and it takes MUCH longer for the material to break down.
Do you have a mechanical shredder? You could possibly mix shredded leaves with other vegetable waste, and also shredded twigs (almost like sawdust) mixed in, might heat up, if you have a large quantity of it.
Otherwise, I think putting dead leaves in plastic sacks, and waiting a VERY long time might be an option.
But go to the RHS or an allotment experts' web site for more information.