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A stable high-voltage lithium-ion battery realized by an in-built water scavenger
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-02-24 , DOI: 10.1039/d0ee00060d
Zhi Chang 1, 2, 3, 4, 5 , Yu Qiao 1, 2, 3, 4 , Han Deng 1, 2, 3, 4, 5 , Huijun Yang 1, 2, 3, 4, 5 , Ping He 6, 7, 8, 9, 10 , Haoshen Zhou 1, 2, 3, 4, 5
Affiliation  

Induced by the hydrolysis of electrolytes, hydrofluoric acid (HF) can exacerbate the notorious transition metal dissolution, which seriously restricts the development of high-energy-density lithium batteries based on high-voltage cathodes. Irremovable water, not limited to trace water originally contained in electrolytes, can also be continuously produced upon battery fabrication and electrochemical cycling processes, which has been ignored for a long time. Herein, exempting cells from cumbersome and time-consuming industrial water-removal procedures, we simply introduced a metal–organic framework (MOF) into the inside of cells as an effective in-built water scavenger. As a result, pairing the in-built water scavengers with various high-voltage cathodes (LiNi0.5Mn1.5O4, LiNi0.8Co0.1Mn0.1O2, etc.), we demonstrated superior cycling stability (72% capacity retention after 400 cycles for LiNi0.8Co0.1Mn0.1O2, calculated from the 4th cycle after 3 cycles of activation) even under a harsh environment (200 ppm water containing electrolyte). Simply using a MOF as a water scavenger can simultaneously reduce the manufacturing costs of lithium-ion batteries while improving their lifespan and safety.

中文翻译:

通过内置除水剂实现稳定的高压锂离子电池

氢氟酸(HF)由电解质的水解诱导,加剧了臭名昭著的过渡金属的溶解,严重限制了基于高压阴极的高能量密度锂电池的开发。不可去除的水,不仅限于最初包含在电解质中的微量水,还可以在电池制造和电化学循环过程中连续产生,这已被长期忽略。在此,为免除繁琐费时的工业除水程序,我们仅将金属有机框架(MOF)引入了电池内部作为有效的内置除水剂。结果,将内置除水剂与各种高压阴极(LiNi 0.5 Mn 1.5 O 4,的LiNi 0.80.10.1 ø 2400个循环后的LiNi),我们证实优越的循环稳定性(72%的容量保持率0.80.10.1 ø 2,活化的3个周期后,从第4次循环计算),即使在恶劣的环境(含电解质的200 ppm水)。简单地将MOF用作除水剂可以同时降低锂离子电池的制造成本,同时提高其使用寿命和安全性。
更新日期:2020-02-24
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