Abstract Bulk and surface reconstructed Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode materials induced by spinel embedment and γ-MnO2 modification were synthesized by a one-step hydrothermal method. The results of XRD, XPS and SEM confirmed the introduction of γ-MnO2. The analysis of XPS, TEM images, dQ/dV curves and CV curves demonstrated that a spinel phase is embedded synchronously in the bulk of layered structure during the process of γ-MnO2 modification. The results of charge-discharge profiles and dQ/dV curves demonstrated the irreversible discharge capacity loss in the initial cycle is reduced with the introduction and collaboration of spinel and γ-MnO2. Namely, the initial coulombic efficiency is improved up to approximately 100%. Furthermore, the specific discharge capacity and rate performances are enhanced by a structure breakthrough for Li+ transport through blending with electrochemical active spinel-phase and γ-MnO2. In addition, the capacity retention of the material is enhanced from 64% up to 85% after 200 cycles. The main reasons are that the surface of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 is stabilized and the phase transformation from surface to bulk is mitigated under the protection of γ-MnO2 coating layer.

中文翻译：

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用于锂离子电池的块体和表面重构富锂锰基正极材料，消除不可逆容量损失

摘要 采用一步水热法合成了尖晶石嵌入和γ-MnO2改性诱导的体相和表面重构Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料。XRD、XPS 和SEM 的结果证实了γ-MnO2 的引入。XPS、TEM图像、dQ/dV曲线和CV曲线的分析表明，在γ-MnO2改性过程中，尖晶石相同步嵌入层状结构体中。充放电曲线和 dQ/dV 曲线的结果表明，随着尖晶石和 γ-MnO2 的引入和配合，初始循环中的不可逆放电容量损失减少。即，初始库仑效率提高到大约 100%。此外，通过与电化学活性尖晶石相和 γ-MnO2 混合，Li+ 传输的结构突破提高了比放电容量和倍率性能。此外，材料的容量保持率在 200 次循环后从 64% 提高到 85%。主要原因是在γ-MnO2涂层的保护下，Li[Li0.2Mn0.54Ni0.13Co0.13]O2表面稳定，从表面到体相的相变减缓。