This report unravels the dependence of the microstructure and electrochemical performances of Li-rich layered transition metal oxide (LLMO) on the molecular structure of polymer templates for the formation of oxalate precursor. A representative LLMO, Li_1.2Mn_0.54Ni_0.13Co_0.13, is synthesized by co-precipitation method, and three samples, LLMO-PVP, LLMO-PEG and LLMO-PVA, are obtained with polymer templates, polyvinyl pyrrolidone (PVP), polyethyleneglycol (PEG) and polyvinyl alcohol (PVA), respectively. The physical and chemical properties of the resulting products are analyzed with SEM, TEM, XRD, BET, ICP, and XPS, and their electrochemical performances as cathode of Li-ion battery are evaluated with EIS, GITT and charge/discharge tests. It is found that LLMO-PVP exhibits the best performances, followed by LLMO-PEG, while LLMO-PVA behaves poorest. This difference is ascribed to the various microstructures of the resulting products, which are determined by the molecular structure of polymer templates.

该报告揭示了富锂层状过渡金属氧化物（LLMO）的微观结构和电化学性能对形成草酸酯前体的聚合物模板分子结构的依赖性。代表性的LLMO Li _1.2 Mn _0.54 Ni _0.13 Co _0.13通过共沉淀法合成，得到三个样品，分别为LLMO-PVP，LLMO-PEG和LLMO-PVA，分别使用聚合物模板，聚乙烯吡咯烷酮（PVP），聚乙二醇（PEG）和聚乙烯醇（PVA）。用SEM，TEM，XRD，BET，ICP和XPS分析所得产物的物理和化学性质，并通过EIS，GITT和充电/放电测试评估其作为锂离子电池正极的电化学性能。发现LLMO-PVP表现最佳，其次是LLMO-PEG，而LLMO-PVA表现最差。该差异归因于所得产物的各种微观结构，其由聚合物模板的分子结构决定。