富含硫的添加剂诱导的介面使得4.6V LiNi0.5 Co0.2 Mn0.3 O2 合成石墨囊细胞具有高度稳定性
Ziqiang Fan1,2, Xunzhu Zhou1,3, Jingwei Qiu2
1Department Institute for Carbon Neutralization, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China.
Angewandte Chemie (International ed. in English)
|August 2, 2023
概括
引入甲基甲基二硫酸盐 (MMDS) 作为添加剂显著提高了高压离子电池 (LIB) 的稳定性. 这创造了一个强大的富含硫的介面,提高容量保留和电池寿命.
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:
- 高压离子电池 (LIB) 的能量密度很高,但由于电解质-电极界面的不稳定,其容量下降.
- 这些接口在高电压下的不兼容性和不稳定性限制了电池的性能和寿命.
研究的目的:
- 在高压LIB中制定构建稳定的电解质-电极介面相的策略.
- 为了提高4.6V LiNi0.5Co0.2Mn0.3O2 (NCM523) 基石墨囊电池的循环寿命和容量保留.
主要方法:
- 引入了一种含硫量超高的添加剂,甲基甲基二硫酸盐 (MMDS, 34.04% S).
- 通过MMDS优先分解形成一个坚固的,富含硫的界面层.
- 在4.6V的电化学测试中对NCM523红色白色石袋细胞进行电化学测试.
主要成果:
- 添加MMDS促进了超薄,坚固的富含硫的间相的形成.
- 添加剂有效地抑制了电解质消耗,气体产生,相位转换和过渡金属离子溶解.
- 4.6伏NCM523的水晶基石袋式电池在800个循环后实现了87.99%的容量保留.
结论:
- 富含硫添加剂诱导的介相是稳定高压LIBs的可行策略.
- MMDS有效地提高了NCM523的电池的电化学性能和周期稳定性.
- 这项研究提供了有关为下一代储能设备设计先进接口的见解.
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