Use a cold solder joint, not actual solder. Here's a great, top end example:
https://www.partsconnexion.com/wbt-spade-connectors.html
but for core materials copper is really hard to beat. Gold plating over copper is also good, since both are soft, and the gold adds corrosion resistance. Here are much more affordable versions:
https://www.partsconnexion.com/audioquest-spade-connectors.html
https://www.partsconnexion.com/wbt-spade-connectors.html
but for core materials copper is really hard to beat. Gold plating over copper is also good, since both are soft, and the gold adds corrosion resistance. Here are much more affordable versions:
https://www.partsconnexion.com/audioquest-spade-connectors.html