Heat oil in Dutch oven over medium-high heat. Add sweet potato and onion and cook, stirring often, until the onion is beginning to soften, about 4 min. Add garlic, chili powder, cumin, chipotle and salt and cook, stirring constantly, for 30 seconds. Add water and bring to a simmer.. Cover, reduce heat to maintain a gentle simmer and cook until the sweet potato is tender, 10 to 12 min.
Add beans, tomatoes, and lime juice; increase heat to high and return to a simmer,stirring often. Reduce heat and simmer until slightly reduced, about 5 min. Remove from heat and stir in cilantro.
