Looking at the options it doesn't look like you can disable the saving of the "AutoRecovery" option and still have it automatically save the document. It's accessible via the following menu.
Tools -> Options -> Load/Save -> General -> Save AutoRecovery Information every ... Minutes
NOTE: This will disable the saving of the "AutoRecovery" info, but you cannot have that disabled without also disabling the "auto saving" feature. You could set the timeout to something really large which would minimize its impact.
It should also be noted that even with this disabled, when you run
libreoffice it will still attempt to recover even with the above option disabled. To truly stop
libreoffice from attempting to make use of a "AutoRecovery" file, you'll need to make use of this switch,
-norestore, when you launch Writer, Calc, Impress, etc. like so:
$ libreoffice -norestore --impress