A Lithium‐Rich Compound Li7Mn(BO3)3 Containing Mn2+ in Tetrahedral Coordination: A Cathode Candidate for Lithium‐Ion Batteries

Filled to capacity: Li7Mn(BO3)3 is lithium-rich and fulfills the prerequisites for a high-capacity cathode for Li-ion batteries. It contains a framework of MnO4 tetrahedra (pink) and BO33− ions (B green, O red, Li black). By employing a nano-composite to enhance electronic conductivity, a first charge capacity of 280 mAh g−1, and a specific energy of 1135 W h kg−1 are obtained within 4.7–1.7 V at a rate of 10 mA g−1.