同时调节Li+运输动力学和结构稳定性在Li-Rich Mn-Based全固态电极中,通过双级粒子工程
Shuang Peng1,2, Haonan Zheng1,2, Kaiqi Bu2
1School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, Guizhou, China.
ChemSusChem
|June 3, 2025
概括
优化Li-rich Mn-based oxides (LRMOs) 中的颗粒大小是全固态电池 (ASSLB) 的关键. 双级粒子工程平衡了Li+运输和界面稳定性,提高了电池的性能和寿命.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 富的基氧化物 (LRMO) 为全固态电池 (ASSLB) 提供了高的理论容量.
- 缓慢的Li+运输和界面不稳定性限制了ASSLB中LRMO的实际应用.
研究的目的:
- 调查LRMO中初级和二级颗粒大小对Li+运输动力学和界面稳定性的关键作用.
- 确定最佳的粒子大小参数,以提高ASSLB中的LRMO性能.
主要方法:
- 在LRMO阴极材料中,初级和二级颗粒大小的系统变化.
- 电化学性能测试,包括容量,速率能力和循环稳定性.
- 对+运输路径和界面现象的分析.
主要成果:
- 大量的二次粒子 (≈10微米) 阻碍了Li+运输,并导致裂.
- 过小的二次粒子 (≈1μm) 会导致接口接触不良和氧气释放,导致相位转换.
- 最佳的二次颗粒大小 (≈5μm) 和增加的初级颗粒大小 (≈0.46μm) 平衡了运输效率和界面完整性.
- 在0.05°C时达到200.2 mAh g-1和在0.3°C时500个循环后保持67.4%.
结论:
- 对LRMO的双尺度粒子工程对于克服ASSLBs的局限性至关重要.
- 优化的颗粒大小提高了Li+动力学和界面稳定性,从而提高了电化学性能.
- 这项研究为设计下一代固态电池的先进阴极材料提供了一条途径.
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