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China team uses LiPON coating to protect Li metal anode in Li-S batteries

A team of researchers in China has devised a simple and mass-produceable method to modify a Li metal anode to avoid the formation of an unstable solid electrolyte interphase (SEI) and the subsequent growth of Li dendrites in high-energy-density Li-S batteries. A paper on their work is published in the journal Energy Storage Materials.

The team placed a LiPON (lithium phosphorus oxynitride) coating on the Li metal anode via nitrogen plasma-assisted deposition of electron-beam reaction evaporation.

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With exceptional chemical and electrochemical stability, lithium phosphorus oxynitride (LiPON) is very promising to form a stable interface between Li metal and organic electrolytes. Furthermore, as the high elastic modulus (77 GPa) and hardness (3.9 GPa), LiPON is mechanically strong enough to suppress and withstand the incursion of Li dendrites at the Li/LiPON interface.

… Here, we develop a facile method to directly deposit a dense, interfacially stable, mechanically robust, and highly ionic conductive LiPON coating layer (~250 nm) on the Li metal surface, via nitrogen plasma-assisted deposition of electron-beam reaction evaporation. Combined with the high deposition rates (> 66 nm min-1) and nonuse of large-scaled targets, the method is inexpensive and suitable for continual and large-scale roll-to-roll production.

—Wang et al.

The LiPON coating serves as a highly ionic conductive, chemically stable and mechanically robust protective layer, which suppresses the corrosion reaction with organic electrolytes and promotes uniform Li plating/stripping, thus enabling a stable and dendrite-free cycling of the symmetric Li metal cells for more than 900 cycles under a current density up to 3 mA cm-2.

Using the LiPON-coated Li as anode, the Li-S pouch cell (sulfur loading: 7 mg cm-2) was obtained with a specific energy density of ~300 Wh kg-1, a relatively stable Coulombic efficiency of ~91% and an extended lifespan of more than 120 cycles with respect to 1.0 Ah capacity retention.

This facile and effective approach opens a new route for stabilizing the Li metal anode and could lead to the practical application in the field of rechargeable Li metal batteries.

—Wang et al.

Resources

  • Weiwen Wang, Xinyang Yue, Jingke Meng, Jianying Wang, Xinxin Wang, Hao Chen, Dingren Shi, Jing Fu, Yongning Zhou, Jian Chen, Zhengwen Fu (2018) “Lithium phosphorus oxynitride as an efficient protective layer on lithium metal anodes for advanced lithium-sulfur batteries,” Energy Storage Materials doi: 10.1016/j.ensm.2018.08.010

Comments

Calgarygary

Coulombic effivency? Makes one wonder if the whole study is a "knock off".

In all seriousness though I don't fully understand the graph. I'm guessing that the lower set of points are generated at a higher charge/ discharge rate?

SJC

This does not prevent polysulfides, it can be used on NMC batteries.

Batteryguy

Bottom two are capacity data and top two are Coulombic eff. Black is their reference group with standard Li and Red is LiPON coated on Li.

Calgarygary

BG

That makes sense. Thanks

Lad

If they can get sulfur to work, there's mountains of it as byproducts of fossil fuel processing.

HarveyD

China seems to be going from copying to leading in many fields?

avada

After using Li metal anodes and sulfur cathodes, the energy density is a measly 300Wh/kg? On the market Li-ion cells are near this (if they haven reached it already) with better efficiency and provenly better cycle life.

SJC

Sion has 400Wh/kg with a metal anode and conventional cathode.

Lad

SJC: Sion, like many others, have yet to produce a battery for the market after promising to do so this year. Sounds all too familiar.

SJC

They are not going for the car market.
They will produce the cells in quantity next year.

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