无稀土化物固体电解质具有高离子导电性,用于全固态电池.
Hong Liu1, Haoyu Yin2, Guangshuo Liao1
1State Key Laboratory of New Ceramic Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
一种新的,没有稀土的固体电解质 (SE) 为全固态电池 (ASSLB) 提供了高离子导电性和低成本. 这一突破解决了当前SE材料的性能-成本权衡问题.
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
- 固态化学 固态化学
背景情况:
- 全固态电池 (ASSLB) 的商业化需要具有高离子导电率 (>1 mS cm−1) 和低成本 (<$ 20 kg−1) 的固体电解质 (SE).
- 现有的SE存在性能-成本困境:高导电性往往涉及昂贵的前体,而低成本的选择缺乏足够的导电性.
- 这种限制阻碍了ASSLB的广泛采用和成本效益.
研究的目的:
- 开发一种新的,无稀土化物固体电解质 (SE),可以克服性能-成本的权衡.
- 为了实现ASSLB应用的同时高离子导电性和低制造成本.
- 调查离子迁移机制,并证明ASSLB设备中开发的SE的实际实用性.
主要方法:
- 合成了一种没有稀土的化物SE,Li2.03Zr0.98P0.02Cl5.95S0.05 (LZC-1PS),使用双位置换策略.
- 通过电化学测量研究了离子导电性,达到1.02mS cm-1.1的室温导电性.
- 使用LZC-1PS与Li6PS5Cl涂层Li-In阳极和NCM811或LCO阴极制造的实验室规模的ASSLB来评估性能.
主要成果:
- LZC-1PS具有超低的成本 (15.21 kg-1美元) 和高室温离子导电性 (1.02 mS cm-1).
- 双位置换 (S2−为Cl−,P5+为Zr4+) 有效地降低了离子扩散障碍,并削弱了Li+-离子相互作用.
- 使用LZC-1PS的ASSLB显示出极好的循环稳定性,在1C时在1200个循环 (LCO) 后保持75.2%的容量,在1000个循环 (NCM811) 后保持76.6%的容量.
结论:
- 开发的LZC-1PS固体电解质成功地解决了ASSLB材料中关键的性能-成本挑战.
- 这种没有稀土的材料为高性能全固态电池的经济高效商业化提供了有前途的途径.
- 这些发现为下一代储能解决方案铺平了道路,提高了安全性和寿命.
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