A stable high-voltage lithium-ion battery realized by an in-built water scavenger,Energy & Environmental Science

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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 (LiNi_0.5Mn_1.5O₄, LiNi_0.8Co_0.1Mn_0.1O₂, etc.), we demonstrated superior cycling stability (72% capacity retention after 400 cycles for LiNi_0.8Co_0.1Mn_0.1O₂, 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 _0.8钴_0.1锰_0.1 ø ₂，等400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_0.8钴_0.1锰_0.1 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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