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U of Western Ontario team proposes Se as promising candidate for all-solid-state Li batteries

Researchers at the University of Western Ontario are proposing selenium (Se) as a promising cathode material for all-solid-state Li batteries, paired with a lithium-tin (L-Sn) alloy as an anode and Li3PS4 as the electrolyte.

In a paper in the RSC journal Energy & Environmental Science, the team reports that in addition to the high electronic conductivity (1×10-3 S cm-1) of Se, a high Li+ conductivity of 1.4×10-5 S cm-1 across the Se-Li3PS4 interface can be achieved. The all-solid-state Li-Se cell shows a high reversible capacity of 652 mAh g-1 (96% of theoretical capacity) and exhibits favorable capacity retention upon cycling.

Li-se
(a) Schematic diagram of an all-solid-state Li-Se battery. (b) Typical discharge/charge profiles of Se and S cathodes in all-solid-state batteries at 50 mA g-1 at room temperature. Li et al. Click to enlarge.

Since the 2000s, all-solid-state Li-S batteries have been studied as a promising alternative battery system due to the high theoretical energy densities (2567 Wh/kg compared to 387 Wh/kg for LIBs). However, these systems are still confronted with major challenges in terms of rechargeability, cycling stability, Coulombic efficiency and rate performance, which are far from commercialization. The fatal weaknesses of all-solid-state Li-S batteries are poor Li+ and electron transports between the electrode and the electrolyte.

Unlike batteries with liquid electrolytes that can easily wet the electrodes and ensure smooth Li+ transport, the Li+ transport in solid-state batteries is highly limited at the electrode-electrolyte interface. Although many of sulfide-based solid-state electrolytes exhibit high Li+ conductivities (10-4 to 10-2 S cm-1 at room temperature), the Li+ transport through the interface can be lagged by several orders of magnitude. … Meanwhile, the poor electronic conductivity of S cathodes is hindering the solid-state electrochemical reactions (lithiation/delithiation). In addition to engineering the S cathodes for all-solid-state batteries, developing new cathode materials with high ionic and electronic conductivities is another important approach to realize all-solid-state lithium batteries.

Compared to S, Se has much higher electronic conductivity (1×10-3 vs. 0.5×10-27 S m-1 at room temperature). Herein, an all-solid-state Li-Se battery is developed for the first time.

—Li et al.

The reversible charge capacity of the Li-Se cell (643 mAh g-1) was substantially higher than that of a Li-S cell (527 mAh g-1). Moreover, the team found, the Li-Se cell exhibited a significantly smaller polarization than the Li-S cell, indicating a higher energy efficiency and a more feasible electrochemical process of Se than S.

Based on their results, the team suggests that compositing Se and S for an advanced hybrid cathode could be a new strategy for enabling high-performance all-solid-state Li batteries. Fine tuning the balance between the ionic and electronic conductive Se and the high capacity S is currently under investigation.

The work was supported by Natural Sciences and Engineering Research Council of Canada (NSERC), Canada Research Chair Program (CRC), China Automotive Battery Research Institute, Canada Foundation for Innovation (CFI), and University of Western Ontario.

Resources

  • Xiaona Li, Jianwen Liang, Xia Li, Changhong Wang, Jing Luo, Ruying Li and Xueliang Sun (2018) “High-performance All-Solid-State Li-Se Batteries Induced by Sulfide Electrolyte” Energy & Environmental Science doi: 10.1039/C8EE01621F

Comments

SJC

"..favorable capacity retention upon cycling."
That is not a scientific expression.

Engineer-Poet
That is not a scientific expression.

"... excellent capacity retention upon cycling."

"nearly perfect capacity retention upon cycling...."

"Samples having better capacity retention upon cycling...."

Stop. Being. That. Guy.

SJC

You don't make sense, stop taking your meds?

avada

What's the point in having tin in the anode? Why not just use plain lithium?

Engineer-Poet

Probably something to do with stability.  A search for "lithium tin anode" turned up several things:

http://www.ipme.ru/e-journals/RAMS/no_12711/kamali.pdf
https://newatlas.com/cheap-alloy-storage-lithium/52031/

SJC

There is no data there, there are no numbers quantifying it.
You are an ego maniac, but you think that is a complement.

SJC

By the way, everyone should know you got banned from Cleantechnica for being a jerk.

avada

@Engineer-Poet
Thanks.

(How do you follow comments? I didn't find any feature to get new comment notifications)

Engineer-Poet

SJC, Wallace (?) banned me from Cleantechnica on my FIRST COMMENT, because he knew that I'd debunk his propaganda and he isn't being paid to have his audience distracted from the message being pushed by his masters.  Yes, I have a reputation for challenging renewablista nonsense.  He knew about me long before I posted a word there.

Wallace even blocked my trackbacks to his posts.  That's how much he's afraid of the truth; if people started following links to well-cited refutations, his blog would quickly become the laughingstock it deserves to be.  You?  You're just clueless.

I see comments disappearing here too.  Sad.

HarveyD

E-P is as agressive as you can get. The type to fight his cat and dog. (and neighbours and other posters).

Engineer-Poet

My attack cat mostly attacks hands, laps (always to be bribed with attention to get her to shut up), catnip and cheese.  Her purr and furballs are weaponized.  She's laser-guided too; point a laser at something and she attacks it.

Jeffgreen54

I have a history with Engineer Poet also. It was in the conversation of nuclear power. Doesn't know me, but attacked my person as though he is completely right. Claimed I am ignorant about nuclear powers. I have argued against nuclear power for yyears and am very knowledgeable in my arguments. Discussion is needed, but aggression is not. Add to the discussion by giving us something good to take away from here. Underlying anger adds nothing to our day in which we all gain from this interaction.

SJC

EP has a sick "mind", Typepad has been notified.

Engineer-Poet

Womp womp.

electric-car-insider.com

Personal attacks serve no purpose in this comments section except to discredit the person making the attack.

HarveyD

Rightly said e-c-i.c but human nature often prevails!

The current CHIEF TWITTER and many questionable paid B-NEWS broadcasters do not help!

Engineer-Poet
I have a history with Engineer Poet also. It was in the conversation of nuclear power. Doesn't know me, but attacked my person as though he is completely right.

ORLY?  A Startpage search didn't turn up anything relevant on this site containing both your username and "nuclear".  So, "Jeffgreen54"... who were you then?

Claimed I am ignorant about nuclear powers. I have argued against nuclear power for yyears and am very knowledgeable in my arguments.

Said "knowledge" almost certainly consisting of propaganda from the likes of Helen Caldicott and UCS.  Deliberately ignoring the stellar record of nuclear power across the world, and being unable to compare the 40-odd fatalities which can be linked to Chernobyl (and zero to TMI or Fukushima) to the 15 deaths per TWh that the BEST (meaning US/European) coal-fired plants produce, is par for the course for people as "knowledgeable" as you.

Discussion is needed, but aggression is not.

Liars must be dealt with aggressively.  They are corrosive.  STOP LYING.

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