中文摘要：

引言 锂离子电池由于能量密度高、质量轻、寿命长且无记忆效应，被广泛用于现代电子设备中。其中尖晶石型LiMn2O4作为新一代动力电池理想材料，已应用于电动自行车和混合电动汽车。作为“绿色能源”的锂离子电池寿命一般为3年左右，如果对这些数以吨计的失效锂电池处理不当，不仅会造成严重的资源浪费，还会造成生态破坏，

英文摘要：

Manganese oxide was obtained by selective chemical leaching of lithium ion out from the spent LiMn2O4 electrode materials and in-situ phase transformation. The prepared manganese oxide was characterized by X-ray power diffraction （XRD） and showed cubic k-MnO2. The λ-MnO2 powder was found to be an effective catalyst for the synthesis of iso-amyl acetate from acetic acid and iso-amyl alcohol. The reaction results showed that when the leaching sulfuric acid concentration was 0.5 mol·L^-1 and reaction time was 3 h, λ-MnO2 showed the best catalytic activity and excellent selectivity for esterification of isoamyl acetate （yield 94.62%）.