ELI5 version would be imagine you’re going to a cinema.
You are first to enter the showing room and all the seats are empty. You can easily find a seat to sit down.
When more and more people come and sit down there are less seats and it takes longer to find one and get to it.
For explainational purposes phones are similar that it takes longer for the ions to find a place in the battery when charging when it is close to full
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