Abstract
A new Se-doped spinel material, LiAl0.18Se0.02Mn1.8O4 powder with a phase-pure polycrystalline was synthesized by a sol–gel method. The material in the 3 V region (2.4 ∼ 3.5 V) and both the 3 and 4 V region (2.4 ∼ 4.4 V) initially deliver a discharge capacity of 81 and 178 mA h g−1 which increase with cycling to reach 110 and 204 after 50 cycles, respectively. The material shows excellent cycleability in the 4 V region (3.0 ∼ 4.4 V) with almost no capacity loss. The structural integrity of the Se-doped spinel was characterized by charge–discharge cycling tests and X-;ray diffraction.
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