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一种新的阴极相间形成方法,通过优先吸附一种酸盐基电解质添加剂

Danfeng Zhang¹, Jiabin Ma¹, Chen Zhang¹

¹Institute of Materials Research (IMR), Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

National science review

|August 12, 2024

概括

一种新的电解质添加剂,三二二三五) (TPFPB),增强了高能电池的稳定性. 这种材料提高了阴极和阳极的性能,使得超长的周期寿命和高能量密度.

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:

高能量密度电池需要高容量阴极和金属阳极之间的稳定接口.
电极的结构降解限制了先进电池化学的实际应用.
开发有效的电解质添加剂对于克服这些稳定性挑战至关重要.

研究的目的:

合成和评估三二三五) (TPFPB) 作为一个电解质添加剂.
为了提高金属阳极和丰富的多层氧化物阴极的稳定性.
为了提高离子电池的整体性能和循环寿命.

主要方法:

合成TPFPB作为一个电解质添加剂.
电化学测试含有和不含TPFPB的金属和丰富的多层氧化物全电池.
分析阴极电解质接口 (CEI) 膜的形成和稳定性.
在各种条件下 (高电压,高质量负载,广泛的温度范围) 评估电池性能.

主要成果:

TPFPB在阴极上形成了一个稳定的 (B和F) 丰富的CEI膜,抑制了副作用.
TPFPB提高了LiNO3的溶解度30倍,改善了Li金属阳极的稳定性.
带有TPFPB的电池具有超长周期寿命 (1500周期) 和高稳定性.
在4.8V,30毫克厘米-2的质量负荷和-30至60°C的温度下实现了特殊的性能.
一个3.1Ah袋式电池在0.1°C时实现了420Wh的kg-1能量密度.

结论:

TPFPB是一种高效的电解质添加剂,用于稳定金属或有丰富的多层氧化物电池.
添加剂显著提高了电极接口的稳定性,从而提高了循环性能.
TPFPB使下一代高能量密度电池具有更好的安全性和耐用性.

关键词:

富含的多层氧化物阴极.电解质添加剂的电解质添加剂高能量密度的袋式电池.界面稳定性界面稳定性偏好的吸附方式

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