Excel recognizes XML and the format is something like this:-
<Workbook xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\" xmlns:x=\"urn:schemas-microsoft-com:office:excel\" xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\" xmlns:html=\"http://www.w3.org/TR/REC-html40\">
<DocumentProperties xmlns=\"urn:schemas-microsoft-com:office:office\">
You might want to create a sample of the output you want in Excel, save it as XML data. Open your regular text edit, and voila... you got the XML skeleton.
Now programmatically converting SQLite to Excel, that's another thing. You didn't mention what language you're conversant with.