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  

Controlled preparation and calcium-doping modification of Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_(2)Cathode material for Lithium-Ion batteries

作　　者：安鹏燕 王舒冉 董默涵 傅世郑 张一龙 王家顺 张德柳 刘朝孟 AN Pengyan;WANG Shuran;DONG Mohan;FU Shizheng;ZHANG Yilong;WANG Jiashun;ZHANG Deliu;LIU Zhaomeng(Institute for Energy Electrochemistry and Urban Mines Metallurgy,School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning China;School of Foreign Languages,Northeastern University,Shenyang 110819,Liaoning China;Key Laboratory of Advanced Energy Materials Chemistry,Ministry of Education(Nankai University),Tianjin 300071,China)

机构地区：[1]东北大学冶金学院能源电化学与城市矿冶金研究所,辽宁沈阳110089 [2]东北大学外国语学院,辽宁沈阳110089 [3]先进能源材料化学教育部重点实验室(南开大学),天津300071

出　　处：《电力科技与环保》2025年第2期194-205,共12页Electric Power Technology and Environmental Protection

基　　金：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。

摘　　要：【目的】锂离子电池因其在循环寿命、能量密度及成本方面的优势,受到了广泛关注。正极材料是实现锂离子电池高能量存储的关键。其中,高镍三元材料因其成本低和容量高等优点成为正极材料的首选,但由于镍元素的存在,发生锂镍混排,电池循环稳定性极差。因此,对三元L[i Ni_(0.8)Co_(0.1)Mn_(0.1)]O_(2)(NCM811)材料的制备和钙掺杂改性进行研究。【方法】采用共沉淀法制备三元材料NCM811的前驱体,通过分析不同静置时间对颗粒形貌、结构以及电化学性能的影响,得到最佳合成条件,并以Ca(OH)_(2)作为钙源对NCM811三元材料进行掺杂改性。【结果】研究表明,静置10 h的倍率下表现出更好的性能,但静置时间为1 h的首次放电比容量较高;静置1 h和10 h在100次循环后的放电比容量和容量保持率十分接近;钙掺杂为3%时反而会出现相反的影响,导致阳离子混排加剧,循环和倍率性能变差,最终得出2%为钙掺杂的最佳掺杂量;最优掺杂量2%的NCM材料在0.1 C的首圈放电比容量为178.25 mA·h/g,库伦效率为81.55%,1 C倍率循环100圈后放电比容量为154.64 mA·h/g和容量保持率为86.37%;材料合成时静置时间10 h具有更好的倍率性能;【结论】适量的钙掺杂可以降低阳离子混排程度,大幅提高了三元材料的放电比容量和容量保持率,改善三元材料的循环和倍率性能。[Objective]As the core component of battery module,cathode material is the key point of to high energy density of battery.Among them,the high nickel ternary material has become the first choice for cathode materials because 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)Co_(0.1)Mn_(0.1)]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.

关 键 词：Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_(2) 锂离子电池 正极材料 电化学性能 钙掺杂 

分 类 号：TK02[动力工程及工程热物理] X773[环境科学与工程—环境工程]