Li-rich layered Li1.2Mn0.54Ni0.13Co0.13O2 derived from transition metal carbonate with a micro–nanostructure as a cathode material for high-performance Li-ion batteries
Li-rich layered Li1.2Mn0.54Ni0.13Co0.13O2 derived from transition metal carbonate with a micro–nanostructure as a cathode material for high-performance Li-ion batteries
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源自过渡金属碳酸盐的富锂层状Li1.2Mn0.54Ni0.13Co0.13O2，具有微纳米结构，可作为高性能锂离子电池的正极材料
DOI：
10.1039/c6ra21006f
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发表时间：
2016-10
期刊：
影响因子：
3.9
通讯作者：
Zhaorong Chang
中科院分区：
文献类型：
--
作者：
Fan Li;Xinbo Wang;Hongwei Tang;Zhaorong Chang
与商业化的正极材料相比，富锂层状氧化物具有更高的质量能量密度。然而，由于其较低的敲击/压制密度，其体积能量密度的优势不如其质量能量密度明显，这限制了其在一些体积受限领域的应用。结果表明，前驱体的形貌对最终产品的性能至关重要。本文采用溶剂热法和共沉淀法合成了具有微米级颗粒的过渡金属碳酸盐小球，以获得高密度富锂层状氧化物。溶剂热合成碳酸盐呈现出以纳米片状为亚单位的微纳层次结构，而共沉淀法合成的碳酸盐则呈现微米级准球状形貌。与共沉淀法合成的碳酸盐(CP-LMNCO)相比，由上述溶剂热合成碳酸盐(ST-LMNCO)制备的Li1.2Mn0.54Ni0.13Co0.13O2的体积密度提高了∼14%。在电化学性能方面，与CP-LMNCO相比，ST-LMNCO具有更高的放电比容量(首次放电296.6 mA h g−1)、更好的倍率性能(1C倍率下201.6 mA h g−1)和更好的容量保持能力(80次循环后容量保持率为86.2%)。作为起始原料的过渡金属碳酸盐的形貌对衍生的Li1.2Mn0.54Ni0.13Co0.13O2粒子的形貌有显著的影响。因此，溶剂热法合成的碳酸盐具有层次化的微纳米结构，是制备高性能Li1.2Mn0.54Ni0.13Co0.13O2的理想前驱体。
Compared to commercialized cathode materials, Li-rich layered oxide exhibits a superior mass energy density. However, owing to its low tap/press density, the advantage of its volume energy density is not as obvious as that of its mass energy density, which limits its applications in some volume-constrained fields. It has been shown that the morphology of the precursor is critical to the performances of the final product. Here, solvothermal and co-precipitation methods were adopted to synthesize transition metal carbonate balls with micro-size particles to obtain high-density Li-rich layered oxides. The solvothermal synthesized carbonate showed a micro–nano hierarchical structure composed of nanoplates as subunits, and the co-precipitated synthesized carbonate just presents a micrometer quasi-ball morphology. The Li1.2Mn0.54Ni0.13Co0.13O2 derived from the above solvothermal synthesized carbonate (ST-LMNCO) demonstrated an improved volume density of ∼14% compared to the one derived from the co-precipitated synthesized carbonate (CP-LMNCO). As for electrochemical performances, the ST-LMNCO exhibited a higher discharge specific capacitance (296.6 mA h g−1 for the first discharge), a better rate performance (201.6 mA h g−1 at 1C rate) and a better capacity retention capability (86.2% after 80 cycles) than the CP-LMNCO. The morphologies of the transition metal carbonates as starting materials significantly impacted the morphologies of the derived Li1.2Mn0.54Ni0.13Co0.13O2 particles. Therefore, the carbonate with a hierarchical micro–nanostructure obtained from the solvothermal method is a promising precursor for high performance Li1.2Mn0.54Ni0.13Co0.13O2.
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