Constructing NiCo2Se4/NiCoS4 heterostructures for high-performance rechargeable aluminum battery cathodes

An aluminum battery based on the NiCo 2 Se 4 /NiCoS 4 cathode delivers a capacity of 112 mA h g −1 after 195 cycles. The charge–discharge principle of the NiCo 2 Se 4 /NiCoS 4 cathode is the Al 3+ intercalation and valence state transition of the Ni, Co, and S elements.