废旧三元锂离子电池正极材料的微波吸收特性  

Microwave absorption characteristics of cathode materials of waste ternary lithium-ion batteries

作　　者：李宁[1,2] 刘秉国[1,2] 张利波[1,2] 刘鹏 郭胜惠[1,2] 董恩华 LI Ning;LIU Bing-guo;ZHANG Li-bo;LIU Peng;GUO Sheng-hui;DONG En-hua(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Provincial Key Laboratory of Intensification Metallurgy,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]昆明理工大学非常规冶金省部共建教育部重点实验室,昆明650093

出　　处：《工程科学学报》2022年第7期1222-1230,共9页Chinese Journal of Engineering

基　　金：可再生能源多能互补关键技术研究及产业化应用示范(2018IB020)。

摘　　要：废旧三元锂离子电池对环境和人类有很大危害性,但是其中的锂、镍、钴、锰等有价金属,具有较高的回收价值.本文以机械破碎后的三元锂电池为原料,研究了正极材料在室温下的表观密度的介电特性以及随温度变化的微波介电特性和吸收性能.结果表明,在室温下,正极材料在表观密度为1.484 g·cm^(–3)时具有最佳的介电性能.加热过程中,正极材料在25~700℃之间都有良好的微波吸收性能,400℃时介电常数ε_(r)达到最大值11.96 F·m^(–1),随着微波功率增大,正极粉末升到700℃的时间明显缩短,最大升温速率在320~450℃的范围内.介电性能变化趋势与微波加热特性变化趋势相吻合.In recent years,lithium-ion batteries using nickel-cobalt-manganese ternary materials as cathode materials have advantages of good electrical performance,high specific energy,green environmental protection,low cost,and high discharge stability.These have been widely used in new energy vehicles and portable electronics product areas.As a new generation of rechargeable batteries,lithium batteries have a certain service life,which is generally 3–5 years.Therefore,the rapid development of lithium-ion batteries has caused a blowout increase in the number of used lithium-ion batteries.Waste ternary lithium-ion batteries are very harmful to the environment and humans,but valuable metals such as lithium,nickel,cobalt,and manganese have a high recycling value.In terms of resource recycling and environmental protection,used lithium-ion batteries have a high recycling value.At present,the recycling of waste lithium-ion batteries is facing some problems.For example,the diversity of electrode materials makes their separation and purification difficult,and the high cost can also cause some problems such as secondary pollution.Therefore,it is necessary to find green and low-cost methods for the recycling of waste lithium-ion batteries.Microwave metallurgy has outstanding advantages in this respect.Therefore,this paper used the mechanically crushed ternary lithium battery as the raw material for studying the dielectric properties of the apparent density of the positive electrode material at room temperature and the microwave dielectric properties and absorption that change with temperature.Results show that at room temperature,the cathode material has the best dielectric performance at an apparent density of 1.484 g·cm^(–3).During the heating process,the cathode material has good microwave absorption performance at 25–700℃.At 400℃,the dielectric constant reaches the maximum value of 11.96 F·M^(–1).With the increase in the microwave power,the time for the positive electrode powder to rise to 700℃ is significantly

关 键 词：锂离子电池 三元 正极粉末 微波加热 介电常数 升温速率 

分 类 号：TM912[电气工程—电力电子与电力传动]