Change Archive Post Limit & Pagination

How can I change the limit for the amount of posts that show up in the Archive Posts? I'm using the archive templates for my category pages, and I can't have more than ten posts show up. The only option is pagination, which I don't like. So can you help me either;

- increase post limit for archives from 10, or
- switch pagination to scrolling read more (scroll down automatically triggers pagination).

Thanks!