French Foreign Minister Laurent Fabius echoed Ban's call, saying a fresh effort was needed to avoid a repeat of the 2009 Copenhagen conference, which ended in failure.
"The pace of the UNFCCC negotiations is far too slow," Ban told a UN meeting on climate. "It's like snails, moving (at a) snail's pace."
"The key political issues are still on the table," he said.
World governments will try to forge a new global accord to address climate change at a UN climate conference in Paris in December, with both developed and developing countries committing to cutting greenhouse gas emissions.
Ban said "credible climate financing is essential" for the Paris climate deal to be a success.
He urged rich countries to follow up on their pledge to mobilize USD 100 billion per year by 2020 to support developing countries as they work to curb emissions and adapt to new clean-energy requirements.
"An agreement must also acknowledge the need for long term, very significant financing beyond 2020," said Ban.
Fabius agreed that "rich countries must recognize that they must make an extra effort" to finance the battle against climate change.
China, Brazil, India and South Africa yesterday ended a meeting with a call to developed countries to deliver on their promises of billions of dollars for climate financing.
The meeting at the United Nations, where US actor-producer Robert Redford will speak, was aimed at building political momentum ahead of a string of meetings across the globe meant to prepare the Paris conference in December.
Ban called on countries to submit "as soon as possible" their national action plans for cutting emissions amid expectations that China, the world's number one emitter, is soon to unveil its long-awaited pledges.