工程科学学报.第43卷，第8期：1019-1023.2021年8月 Chinese Journal of Engineering,Vol.43,No.8:1019-1023,August 2021 https://doi.org/10.13374/j.issn2095-9389.2020.12.31.007;http://cje.ustb.edu.cn 前驱体烘干温度对富锂锰基正极材料形貌和电化学性 能的影响 杨震12)，厉英12)四，马培华) 1)东北大学治金学院，沈阳1108192)辽宁省治金传感器材料及技术重点实验室，沈阳110819 ☒通信作者，E-mail:liying@mal.neu.edu.cn 摘要以过渡金属硫酸盐、氢氧化钠、氨水为原料，通过连续共沉淀一高温固相法制备了富锂锰基正极材料 Li.17No.3Mn.sO2.对其进行了包括微观形貌、宏观形貌、晶体结构、电化学性能等方面的表征，研究了前驱体烘干温度对于 粒度较小前驱体的宏观形貌及锂化后正极材料的微观形貌和电化学性能的影响.结果表明，烘干温度较高的前驱体在烘干 后出现了明显了宏观烧结现象，锂化并涂布后出现了明显的颗粒；烘干温度较低的前驱体在烘干后并未出现宏观烧结现象， 锂化并涂布后未出现明显的颗粒.在电化学性能方面，前驱体烘干温度较高的正极材料在经历50个循环后，可逆比容量只剩 下85%，下降比较明显：前驱体烘干温度较低的正极材料在经历了50个循环后，可逆比容量未出现明显下降. 关键词富锂正极：前驱体：粒度：烘干：电化学性能 分类号TM912.9 Effect of precursor drying temperature on the morphology and electrochemical performance of lithium-rich manganese-based cathode materials YANG Zhen 2),LI Ying2 MA Pei-hua 1)School of Metallurgy,Northeastern University,Shenyang 110819,China 2)Liaoning Key Laboratory for Metallurgical Sensor Materials and Technology,Shenyang 110819,China Corresponding author,E-mail:liying @mail.neu.edu.cn ABSTRACT With the gradually increasing consumption of coal,oil,and natural gas and the increasing environmental pollution, recyclable secondary energy has become crucial to solving energy and environmental problems.Lithium-ion batteries have penetrated into all aspects of life.Its high energy density,high voltage platform,long life,and environment-friendly characteristics make it widely in-demand.Lithium-ion batteries are used in devices such as mobile phones,tablet computers,and electric vehicles,in which requirements of energy density,rate,and cycle performance are high.The high-capacity lithium-rich material can provide a reversible specific capacity higher than 250 mA-hgand an energy density of up to 600 W-h-kg,making it a positive electrode material.Being a scarce and strategic resource,the price of cobalt has considerably increased.The price fluctuation of cobalt directly affects the cost of the full battery.Drying conditions have a minor effect on most cathode materials and precursors and do not affect the size,morphology,and elemental distribution of their precursors.Thus,virtually no one has explored the effects of such drying conditions.Herein,we studied the drying conditions of cobalt-free lithium-rich cathode materials and explored the influence of drying condition on the morphology and electrochemical performance of cathode materials.Using sodium hydroxide,which is a transition metal sulfate,and ammonia as raw materials,a lithium-rich manganese-based cathode material (LiNio 33Mno sO2)was prepared via coprecipitation followed by sintering 收稿日期：2020-12-31 基金项目：国家自然科学基金资助项目(51834004,51774076.51474057.51904068)前驱体烘干温度对富锂锰基正极材料形貌和电化学性 能的影响 杨    震1,2)，厉    英1,2) 苣，马培华1) 1) 东北大学冶金学院，沈阳 110819    2) 辽宁省冶金传感器材料及技术重点实验室，沈阳 110819 苣通信作者，E-mail: liying@mail.neu.edu.cn 摘     要     以过渡金属硫酸盐 、氢氧化钠 、氨水为原料 ，通过连续共沉淀 – 高温固相法制备了富锂锰基正极材 料 Li1.17Ni0.33Mn0.5O2 . 对其进行了包括微观形貌、宏观形貌、晶体结构、电化学性能等方面的表征，研究了前驱体烘干温度对于 粒度较小前驱体的宏观形貌及锂化后正极材料的微观形貌和电化学性能的影响. 结果表明，烘干温度较高的前驱体在烘干 后出现了明显了宏观烧结现象，锂化并涂布后出现了明显的颗粒；烘干温度较低的前驱体在烘干后并未出现宏观烧结现象， 锂化并涂布后未出现明显的颗粒. 在电化学性能方面，前驱体烘干温度较高的正极材料在经历 50 个循环后，可逆比容量只剩 下 85%，下降比较明显；前驱体烘干温度较低的正极材料在经历了 50 个循环后，可逆比容量未出现明显下降. 关键词    富锂正极；前驱体；粒度；烘干；电化学性能 分类号    TM912.9 Effect  of  precursor  drying  temperature  on  the  morphology  and  electrochemical performance of lithium-rich manganese-based cathode materials YANG Zhen1,2) ，LI Ying1,2) 苣 ，MA Pei-hua1) 1) School of Metallurgy, Northeastern University, Shenyang 110819, China 2) Liaoning Key Laboratory for Metallurgical Sensor Materials and Technology, Shenyang 110819, China 苣 Corresponding author, E-mail: liying@mail.neu.edu.cn ABSTRACT    With  the  gradually  increasing  consumption  of  coal,  oil,  and  natural  gas  and  the  increasing  environmental  pollution, recyclable secondary energy has become crucial to solving energy and environmental problems. Lithium-ion batteries have penetrated into all aspects of life. Its high energy density, high voltage platform, long life, and environment-friendly characteristics make it widely in-demand.  Lithium-ion  batteries  are  used  in  devices  such  as  mobile  phones,  tablet  computers,  and  electric  vehicles,  in  which requirements of energy density, rate, and cycle performance are high. The high-capacity lithium-rich material can provide a reversible specific capacity higher than 250 mA·h·g–1 and an energy density of up to 600 W·h·kg–1, making it a positive electrode material. Being a scarce and strategic resource, the price of cobalt has considerably increased. The price fluctuation of cobalt directly affects the cost of the full battery. Drying conditions have a minor effect on most cathode materials and precursors and do not affect the size, morphology, and elemental distribution of their precursors. Thus, virtually no one has explored the effects of such drying conditions. Herein, we studied the drying conditions of cobalt-free lithium-rich cathode materials and explored the influence of drying condition on the morphology and electrochemical performance of cathode materials. Using sodium hydroxide, which is a transition metal sulfate, and ammonia as raw materials, a lithium-rich manganese-based cathode material (Li1.17Ni0.33Mn0.5O2 ) was prepared via coprecipitation followed by sintering 收稿日期: 2020−12−31 基金项目: 国家自然科学基金资助项目（51834004，51774076，51474057，51904068） 工程科学学报，第 43 卷，第 8 期：1019−1023，2021 年 8 月 Chinese Journal of Engineering, Vol. 43, No. 8: 1019−1023, August 2021 https://doi.org/10.13374/j.issn2095-9389.2020.12.31.007; http://cje.ustb.edu.cn