Prepare the slow cooker liner with nonstick cooking spray.
Place the wings into the slow cooker. Mix together ¼ cup water, lime juice, and ¼ teaspoon ground ginger. Pour over the chicken wings.
Cover and cook on high for 3 to 4 hours or until the wings are cooked through.
Meanwhile, prepare a large baking sheet with aluminum foil spritzed with nonstick cooking spray and preheat the broiler.
Prepare the wing sauce in a small saucepan over medium heat by mixing the remaining water, remaining ginger, peanut butter, soy sauce, garlic, and red pepper flakes. Cook just until smooth, about 2 minutes.
Toss the wings with half of the wing sauce and place on the baking sheet in a single layer.
Place under the broiler and bake until crispy, about 5 to 8 minutes. Toss again in the remaining sauce.