Liu Jun, Liu Qiming, Zhu Huali, Lin Feng, Ji Yan, Li Bingjing, Duan Junfei, Li Lingjun, Chen Zhaoyong
College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China.
College of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China.
Materials (Basel). 2019 Dec 20;13(1):40. doi: 10.3390/ma13010040.
Li-rich layered oxide cathode materials have become one of the most promising cathode materials for high specific energy lithium-ion batteries owning to its high theoretical specific capacity, low cost, high operating voltage and environmental friendliness. Yet they suffer from severe capacity and voltage attenuation during prolong cycling, which blocks their commercial application. To clarify these causes, we synthesize LiMnNiCoO (LiMnNiCoO) with high-nickel-content cathode material by a solid-sate complexation method, and it manifests a lot slower capacity and voltage attenuation during prolong cycling compared to LiMnNiCoO (LiMnNiCoO) and LiMnNiCoO (LiMnNiCoO) cathode materials. The capacity retention at 1 C after 100 cycles reaches to 87.5% and the voltage attenuation after 100 cycles is only 0.460 V. Combining X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscopy (TEM), it indicates that increasing the nickel content not only stabilizes the structure but also alleviates the attenuation of capacity and voltage. Therefore, it provides a new idea for designing of Li-rich layered oxide cathode materials that suppress voltage and capacity attenuation.
富锂层状氧化物正极材料因其高理论比容量、低成本、高工作电压和环境友好性，已成为高比能锂离子电池最具前景的正极材料之一。然而，在长时间循环过程中，它们会出现严重的容量和电压衰减，这阻碍了它们的商业应用。为了阐明这些原因，我们通过固相络合法合成了高镍含量的正极材料LiMnNiCoO（LiMnNiCoO），与LiMnNiCoO（LiMnNiCoO）和LiMnNiCoO（LiMnNiCoO）正极材料相比，它在长时间循环过程中表现出慢得多的容量和电压衰减。100次循环后，1 C下的容量保持率达到87.5%，100次循环后的电压衰减仅为0.460 V。结合X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）表明，增加镍含量不仅能稳定结构，还能减轻容量和电压的衰减。因此，它为设计抑制电压和容量衰减的富锂层状氧化物正极材料提供了新思路。
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