无钴富镍正极材料的火焰辅助喷雾热解合成与性能研究

Preparation and Performance of Cobalt-Free Nickel-Rich Cathode Materials Through Flame-Assisted Spray Pyrolysis

锂离子电池富镍三元正极材料因其成本低、容量高的优势受到广泛关注,受限于钴的高毒性、低储量,富镍正极材料无钴化成为锂离子电池未来的发展趋势。传统液相法制备无钴富镍材料存在步骤繁琐、耗时长、副产物多等问题。火焰辅助喷雾热解(FASP)方法可一步合成正极材料,具有设备简单、耗时短、环境友好等优点。采用FASP方法制备LiNi_(0.8)Mn_(0.2)O_(2)(NM82)无钴富镍正极材料,探究合成条件对NM82结构、形貌和电化学性能的影响。结果表明,FASP可一步合成NM82正极材料,且其在载气流速1.5L/min、锂过量10%、退火温度800℃条件下的锂镍混排水平最低,放电比容量最高,在0.1C倍率下达到180.2mA∙h/g。

Nickel-rich ternary cathode materials for lithium-ion batteries have received extensive attention due to their advantages of low cost and high capacity.Limited by the high toxicity and low reserves of cobalt,cobalt-free nickel-rich cathode materials are becoming the future development trend of lithium-ion batteries.The traditional liquid phase method for the preparation of cobalt-free nickel-rich materials has problems such as cumbersome steps,time-consuming,and many by-products.Flame-assisted spray pyrolysis(FASP)method can synthesize cathode materials in one step,which has the advantages of simple equipment,short time and environmental friendliness.In this study,LiNi_(0.8)Mn_(0.2)O_(2)(NM82)cobalt-free nickel-rich cathode material was prepared by the FASP method,and the effects of synthesis conditions on the structure,morphology and electrochemical properties of NM82 were investigated.The results show that FASP can synthesize NM82 cathode material in one step.Under the conditions of carrier gas flow rate of 1.5 L/min,lithium excess of 10%and annealing temperature of 800°C,NM82 has the lowest lithium-nickel mixing level and the highest discharge specific capacity,reaching 180.2 mA∙h/g at 0.1 C rate.