Is Talaaq valid out of anger?

I am very afraid of uttering a divorce to my wife after hearing so many stories of men saying it in anger. Alhamdulillah I have never done this but to be safe can I tell my wife that if I ever want to divorce her (Allah forbid) it can only be done in writing on a certain day of a month at a certain time. If anything is ever said out of anger then it will not hold?
Jazakallah for your efforts.

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