不同体系结构NCM正极材料环境适应性研究

Study on environmental adaptability of NCM cathode material with different architecture

锂离子电池因优异性能得到了广泛运用,但不同结构正极材料存在各自的优缺点,出于优势互补进而制备的三元正极材料应运而生。三元正极材料中,镍钴锰酸锂(NCM)类相较于镍钴铝酸锂(NCA)类材料具有制备工艺简单的优势,有良好的应用前景。电池使用幅域辽阔,气候差异大,考察正极材料在宽温(-25~+55℃)范围内的环境适用性显得尤为重要。通过制备、表征得到了NCM622/NCM811不同体系、NCM811不同结构的正极材料,对材料高低温环境适应性、抗跌落适应性进行研究,探究材料体系结构对充放电容量等电化学性能的影响,为后期成品化应用提供依据。

Lithium-ion batteries have been widely used due to their excellent performance.However,different cathode materials with different structures have their own advantages and disadvantages.Therefore,ternary cathode materials prepared by complementary advantages emerged at the right moment.In ternary cathode materials,lithium nickel-cobalt manganate(NCM)class has the advantage of simple preparation process compared with lithium nickelcobalt Aluminate(NCA)class,and has a good application prospect.It is particularly important to investigate the environmental suitability of cathode materials in the wide temperature range(-25~+55℃)due to the wide range of battery use and large climate differences.Cathode materials with different NCM622/NCM811 systems and different NCM811 structures were obtained through preparation and characterization.The adaptability of the materials to high and low temperature environment and anti-drop adaptability were studied to explore the influence of material architecture on electrochemical properties such as charge and discharge capacity,providing a basis for the later finished product application.