阴极内海尔姆霍尔茨平面中的特定吸附氧化策略使4.6V实用的离子全电池成为可能
Shulan Mao1,2, Jiale Mao1,2, Zeyu Shen1,2
1State Key Laboratory of Chemical Engineering, Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Nano letters
|July 31, 2023
概括
新的添加剂通过控制阴极电解质间相 (CEI) 形成来稳定高压离子电池阴极. 这样可以防止降解,使氧化层阴极的寿命更长,能量密度更高.
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
- 电池技术 电池技术
背景情况:
- 高切断电压最大限度地提高了分层氧化物阴极 (LiTMO2) 的容量.
- 高电压/高温导致碳酸盐脱-氧化,导致弱阴极电解质介相 (CEI) 和结构崩.
- 开发稳定的CEI对于高压电池性能至关重要.
研究的目的:
- 研究CEI形成的特定吸附氧化 (Ad-O) 机制.
- 开发量身定制的添加剂,以控制阴极内部海尔姆霍尔茨平面 (C-IHP) 中的CEI生成.
- 提高高压分层氧化物阴极的稳定性和性能.
主要方法:
- 在C-IHP中利用分子调节,通过定制的添加剂与富含电子的组.
- 研究了添加剂在阴极活性位点上的吸附氧化机制.
- 分析了由此产生的等级CEI结构 (内部LiF,外部B-F/-CN有机).
主要成果:
- 量身定制的添加剂掩盖了正极活性点,减少了弱CEI的产生.
- 一层层次的CEI层形成,保护正极免受电解质腐蚀.
- LiNi0.8Co0.1Mn0.1O2/石墨袋式电池在4.6V和60°C时达到270Wh/kg.
- 细胞在450个周期内保持了性能.
结论:
- 特定的Ad-O机制有效地调节了高压阴极的CEI形成.
- 使用定制添加剂的协同策略提高了阴极稳定性和电化学性能.
- 为下一代离子电池实现了显著的能量密度和循环寿命.
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