【摘要】 采取两步改性法合成了锆硼共改性的 LiNi_0.8Co_0.1Mn_0.1O₂正极材料。实验表明，Zr 元素改性会对高镍三元材料造成Zr⁴⁺的掺杂，而B元素改性则大部分以B₂O₃的形式包覆在材料的表面。电化学测试结果可知，锆元素改性能够提升材料的放电比容量以及倍率性能。相比于单一的锆元素改性材料，锆硼共改性从材料一次粒子和二次粒子分别入手，Zr 元素掺杂提升了材料的机械强度，而 B 元素的包覆改性，为材料加了一层保护，避免了电解液与材料的直接接触，材料表现出更佳的结构稳定性。在循环250次后，依然具有83.8%的容量保持率，而未改性的NCM样品以及单纯锆元素改性的样品，分别只具有最初容量的74.7%和 77.8%。但是，由于 B 元素的化学惰性，锆硼共改性降低了材料的放电比容量和倍率性能。更多还原

【Abstract】 A two-step compound modification method was used to synthesize a zirconium-boron co-modified LiNi_0.8Co_0.1Mn_0.1O₂cathode material. The experimental results show that the modification of Zr element at high temperature will cause the doping of Zr⁴⁺in the Ni-rich layered materials, while the modification of B element is mostly coated on the surface of the Ni-rich layered materials in the form of B₂O₃. It can be seen from the electrochemical test results that the zirconium element modification can improve the discharge specific capacity and rate performance of the material. Compared with a single zirconium modified material, Zirconium-boron comodification starts with the primary particles and secondary particles of the material separately. Zr element doping improves the mechanical strength of the material and delays the generation of intergranular cracks. At the same time the coating modification of B element adds a layer of protection to the secondary ball material which avoid the direct contact between the electrolyte and the material. the zirconium-boron co-modified material exhibits better structural stability. After 250 cycles, it still has a capacity retention rate of 83.82%, while the unmodified NCM sample and the samples modified with pure zirconium have only 74.72% and 77.75% of the original capacity, respectively. However due to the chemical inertness of the B element, the discharge specific capacity of the zirconium-boron co-modified material has decreased, and the rate performance has been reduced to a certain extent compared with the high nickel ternary material modified by zirconium alone.更多还原