Institute for Energy Electrochemistry and Urban Mines Metallurgy, School of Metallurgy, Northeastern University;School of Foreign Languages, Northeastern University;Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education (Nankai University);
[Objective]As the core component of battery module, cathode material is the key point of to high energydensity of battery. Among them, the high nickel ternary material has become the first choice for cathode materialsbecause of its low cost and high capacity. However, due to the presence of nickel elements, lithium-nickel mixing occurs and the battery cycle stability is extremely poor. Herein, the preparation and calcium doping modification of terpolymer Li[Ni)(0.8)Co0.1Mn0.1]O_2(NCM811) were studied. [Methods]The precursor of ternary material NCM811 was prepared by coprecipitation method. The optimum synthesis conditions were obtained by analyzing the effects of different standing time on the morphology, structure and electrochemical properties of the particles. Calcium is used as doping element and modify ternary material to improve their capacity and circulation performance. [Results]The study showed that the multiplicity of 10 h of resting showed better performance, but the first discharge capacity is higher at 1 h. The specific discharge capacity and capacity retention rate after 100 cycles for 1 h and 10 h are very close to each other. When the calcium doping is 3%, the opposite effect will appear, leading to the intensification of cationic mixing, and the deterioration of circulation and magnification properties. The result is calcium doped at 2% for the optimal doping amount. The NCM material with a doping capacity of 2% has a discharge specific capacity of 178.25 mA·h/g at 0.1 C, a Coulomb efficiency of 81.55%, a discharge specific capacity of 154.64 mA·h/g and a capacity retention rate of 86.37% after 100 cycles at 1 C. Material synthesised with a resting time of 10 h has better multiplicative properties. [Conclusion]Appropriate amount of calcium doping can reduce the degree of cation mixing and discharging, which significantly improves the discharge specific capacity and capacity retention of ternary materials, and improves the cycling and multiplication performance of ternary materials.and the battery cycle stability is extremely poor.Herein,the preparation and calcium doping modification of terpolymer Li[Ni0.8Co0.1Mn0.1]O_2(NCM811) were studied.[Methods]The precursor of ternary material NCM811 was prepared by coprecipitation method.The optimum synthesis conditions were obtained by analyzing the effects of different standing time on the morphology,structure and electrochemical properties of the particles.Calcium is used as doping element and modify ternary material to improve their capacity and circulation performance.[Results]The study showed that the multiplicity of 10 h of resting showed better performance,but the first discharge capacity is higher at 1 h.The specific discharge capacity and capacity retention rate after 100 cycles for 1 h and 10 h are very close to each other.When the calcium doping is 3%,the opposite effect will appear,leading to the intensification of cationic mixing,and the deterioration of circulation and magnification properties.The result is calcium doped at 2% for the optimal doping amount.The NCM material with a doping capacity of 2% has a discharge specific capacity of 178.25 mA·h/g at 0.1 C,a Coulomb efficiency of 81.55%,a discharge specific capacity of 154.64 mA·h/g and a capacity retention rate of 86.37%after 100 cycles at 1 C.Material synthesised with a resting time of 10 h has better multiplicative properties.[Conclusion]Appropriate amount of calcium doping can reduce the degree of cation mixing and discharging,which significantly improves the discharge specific capacity and capacity retention of ternary materials,and improves the cycling and multiplication performance of ternary materials.
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Basic Information:
DOI：10.19944/j.eptep.1674-8069.2025.02.003
China Classification Code:TQ131.11;TM912
Citation Information:
[1]安鹏燕,王舒冉,董默涵等.锂离子电池正极材料Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_2的可控合成与Ca掺杂改性[J].电力科技与环保,2025,41(02):194-205.DOI:10.19944/j.eptep.1674-8069.2025.02.003.
Fund Information:
国家自然科学基金青年基金项目(52204308); 辽宁省自然科学基金面上项目(2023-MSBA-101); 中国博士后科学基金面上项目(ZX20220158); 东北大学博士后基金一等资助项目;东北大学高校基本科研业务费项目大学生创新创业训练项目