Table 3 Summary of the green score criteria and process comparison.

From: Lithium-ion battery recycling—a review of the material supply and policy infrastructure

Process

Complexity

Waste generation

Power consumption

Green score

Pyrometallurgy

8

6

5

19

Hydrometallurgy

6

7

7

20

Direct recycling*

7

8

8

23

  1. *Based on reported laboratory-scale efforts.