在层氧化物中,通过Cu/Mg联合剂实现适应性晶格呼吸,以获得稳定的阴离子氧化氧化还原化学
Ziqin Zhang1, Wenji Yin1, Jiming Peng2
1Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University Guilin 541004 Guangxi PR China whq74@gxnu.edu.cn sjhu@gxnu.edu.cn.
与铜和一起配合多层氧化物阴极,使高能离子电池具有稳定的氧离子氧氧化还原. 这种适应性格子呼吸机制减轻了结构扭曲,提高了电池的性能.
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:
- 进步的离子电池需要更高的能量密度通过分层的氧化物阴极.
- 传统的阴离子氧化还原是有限的;氧离子氧化还原提供了更高的容量,但面临着像Jahn-Teller扭曲这样的稳定性挑战.
研究的目的:
- 为了研究合作的Cu/Mg联合兴奋剂,以稳定氧离子氧氧化还原在多层氧化物阴极.
- 了解缓解结构降解和提高电化学性能的机制.
主要方法:
- 合成P3-Na0.67Mn0.9Mg0.05Cu0.05O2分层的氧化物. 这种氧化物的合成.
- 在现场光谱法可视化在氧化还原过程中的动态晶格变化.
- 电化学测试以评估容量保留和循环稳定性.
主要成果:
- 合作的Cu/Mg联合注会诱导一个自适应的晶格呼吸机制.
- 这种机制抑制了Jahn-Teller扭曲,并保持了分层结构的完整性.
- 在P3-Na0.67Mn0.9Mg0.05Cu0.05O2阴极实现了258.1mAhg-1的可逆容量,在80个周期以5.0C的温度后保持75.3%.
结论:
- 适应性网状呼吸是离子电池中稳定的阳离子氧化还原化学的可行策略.
- Cu/Mg联合剂有效地提高了分层氧化物阴极的能量密度和循环寿命.
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