东北大学冶金学院能源电化学与城市矿冶金研究所;东北大学外国语学院;先进能源材料化学教育部重点实验室(南开大学);
【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Li[Ni0.8Co0.1Mn0.1]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。
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基本信息:
DOI：10.19944/j.eptep.1674-8069.2025.02.003
中图分类号:TQ131.11;TM912
引用信息:
[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.
基金信息:
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