Abstract
In this paper, we have synthesized LiNi[Formula: see text]Mn[Formula: see text]O4 with P4332 space group by carbonate co-precipitation. TG/DSC, TG*, ICP-OES, a gas displacement pycnometer using He gas, XPS, and XRD refinement results show that oxygen vacancies exist in the LiNi[Formula: see text]Mn[Formula: see text]O[Formula: see text] with a P4332 space group. There is a mixture of Mn[Formula: see text] and Mn[Formula: see text] in the P4332 structured LiNi[Formula: see text]Mn[Formula: see text]O[Formula: see text]. Despite the large amount of Mn[Formula: see text] in the spinel structure, no 4.0[Formula: see text]V plateau appears in charge–discharge curves. This result indicates that the Mn[Formula: see text] in LiNi[Formula: see text]Mn[Formula: see text]O[Formula: see text] does not participate in electrochemical reactions during the charge–discharge process.
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