4.2 V O3层阴极在离子囊细胞中,由分子间强化以太电解质启用
Xinke Cui1, Shuicen Ding1, Yaoshen Niu2
1Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|February 12, 2025
概括
研究人员开发了一种新的分子间增强电解质 (IRE),以实现离子电池的高压循环. 这一创新显著提高了O3型层正极的稳定性和寿命,用于实际的储能应用.
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:
- 增加重力测量能量密度对于实际的离子电池应用至关重要.
- 高充电电压 (例如4.2V与Na/Na+) 对于O3型分层阴极是可取的,但由于稳定性问题而具有挑战性.
- 稳定高压阴极循环对于推进离子电池技术至关重要.
研究的目的:
- 开发一种新的电解质策略,用于稳定的O3型分层阴极的高压循环.
- 通过解决电解质限制,提高离子电池的性能和循环寿命.
- 为了研究一个分子间增强电解质 (IRE) 对于商业NaNi1/3Fe1/3Mn1/3O2 (NFM) 阴极的有效性.
主要方法:
- 使用受保护的以太分子设计和合成一种新的分子间增强电解质 (IRE).
- 在高切断电压下 (高达4.2VNa) 用IE对NFM阴极进行电化学测试.
- 使用IRE,制造和长期循环评价NFM灯管管道硬碳袋细胞.
主要成果:
- 带有 IRE 的 NFM 阴极在 4.2 V Na 时达到 158 mAh g-1 的高特异容量.
- 在4.2VNa的稳定循环是通过形成薄,有机丰富的阴极电解质接口来促进的.
- 一个安培小时级的NFM干部硬碳袋电池与IRE在4.2VNa的800个循环后显示了82.8%的容量保留.
结论:
- 开发的IRE在高电压下有效稳定O3型分层阴极,克服了以前的限制.
- 这种电解质策略显著提高了离子电池的长期循环稳定性.
- IRE对实用,高能量密度的离子电池应用有很大的前景.
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