| AlPO4涂层在提高高电压LiNi0.5Mn1.5O4正极材料循环稳定性和倍率性能中的关键作用 | |
| Critical roles of AlPO4 coating in enhancing cycling stability and rate capability of high voltage LiNi0.5Mn1.5O4 cathode materials | |
| 摘要: 采用高温固相法制备了LiNi0.5Mn1.5O4(LNMO)，然后采用湿化学法在多面体LNMO表面涂覆AlPO4(AP)，制备得到LNMO-AP复合材料。实验结果表明，AlPO4与LNMO的质量比为1%时制备的LNMO-1% AP|Li电池表现出较好的电化学性能，其在1C条件下循环450次后，放电比容量为108.78 mAh·g-1，而未涂覆AP的LNMO|Li电池的放电比容量仅为86.04 mAh·g-1。特别是在5C和10C的高倍率条件下，前者的电化学性能远远优于后者。这归因于AP涂层使与电解液接触的LNMO表面更加稳定，有效地促进了Li+的传输并降低了电极的极化电压。 | |
| 关键词: LiNi0.5Mn1.5O4 高压锂离子电池 高温固相法 磷酸铝 表面改性 | |
| 基金项目: 国家自然科学基金(No.52372185，52062004)、贵州省先进电化学储能器件与关键材料技术创新人才团队建设(黔科合平台人才-CXTD[2023]016)、贵州省高层次创新人才(黔科合平台人才-GCC[2022]013-1)、贵州省高等学校先进电化学储能器件及关键材料创新团队(黔教技[2023]054号)资助。 | |
| Abstract: LiNi0.5Mn1.5O4 (LNMO) was prepared by a high-temperature solid phase method, and then AlPO4 (AP) was coated on the polyhedral LNMO surface by the wet chemical method. The experimental results showed that the LNMO-1%AP|Li cell prepared with a 1% mass ratio of AlPO4 and LNMO had better electrochemical performance; after 450 cycles at 1C, its discharge specific capacity maintained 108.78 mAh·g-1, while that of the LNMO|Li cell was only 86.04 mAh·g-1. Especially at the high rates of 5C and 10C, the electrochemical properties of the former were far superior to the latter. This was attributed to the fact that the AP coating made the surface of LNMO in con- tact with the electrolyte more stable, effectively promoted the Li+ transport, and reduced the polarization voltage of the electrode. | |
| Keywords: LiNi0.5Mn1.5O4 high voltage lithium-ion batteries high-temperature solid-phase method aluminum phosphate | |
| 投稿时间：2024-11-07 修订日期：2025-03-16 | |
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