在碳酸盐电解质中持续释放LiNO3,用于稳定的金属阳极
Siyu Li1, Yuhang Liu1, Ke Wang1
1Shaanxi Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an 710072, China. iamwai@nwpu.edu.cn.
概括
酸 (LiNO3) 添加剂通过形成保护层来提高电池的稳定性. 一个新的双层分离器可以实现持续释放,增长电池寿命并防止树的生长.
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:
- 酸 (LiNO3) 是一种有效的添加剂,可以在金属阳极上形成保护性固体电解质介相 (SEI).
- NO3在传统碳酸盐电解质中的溶解性差,限制了它在电池中的实际应用.
- 寄生反应和树状石的形成会降低电池的性能和寿命.
研究的目的:
- 开发一种在碳酸盐电解质中持续释放LiNO3的战略.
- 为了提高固体电解质介相 (SEI) 的耐用性和保护性质.
- 为了提高离子电池的循环稳定性和寿命.
主要方法:
- 设计和制造一种用于控制LiNO3释放的新型二层分离器.
- 使用修改后的分离器,对LiLiFePO4电池进行电化学表征.
- 分析固体电解质介相 (SEI) 的化学和形态.
主要成果:
- 双层分离器使LiNO3的可持续释放成为可能,改变了SEI的化学成分,并补充了耗尽的添加剂.
- 显著抑制了树状石的形成.
- 在LiLiFePO4电池中经过800个循环后实现了85%的容量保留,表明耐用性提高.
结论:
- 双层分离器战略有效地克服了LiNO3在碳酸盐电解质中的可溶性限制.
- 持续的LiNO3释放提高了SEI的稳定性和电池周期寿命.
- 这种方法为提高电池的性能和寿命提供了一个有希望的解决方案.
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