A New Concept of an Air-Electrode Catalyst for Li2O2 Decomposition Using MnO2 Nanosheets on Rechargeable Li-O2 Batteries

Saito, Morihiro; Kosaka, Shinpei; Fujinami, Taichi; Tachikawa, Yusuke; Shiroishi, Hidenobu; Streich, Daniel; Berg, Erik J.; Novák, Petr; Seki, Shiro

doi:10.1016/j.electacta.2017.08.183

Cited by 10 publications

(6 citation statements)

References 52 publications

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“…While there have been limited studies on Li 2 O 2 as the cathode prelithiation material for lithium-ion batteries, Li 2 O 2 chemistry has been extensively studied in the field of rechargeable Li-air batteries. [7][8][9][10][11] The thermodynamic potential for Li 2 O 2 decomposition is at 2.96 V vs Li/Li + . 9 However, the decomposition reaction usually occurs at > ∼4.7 V vs Li/Li + in the absence of catalysts, indicating a large activation energy associated with the decomposition reaction.…”

mentioning

confidence: 99%

Decomposition of Li₂O₂ as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

Zhang

Jeong

Reinsma

et al. 2021

J. Electrochem. Soc.

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Compared to the graphite anode, Si and SiOx-containing anodes usually have a larger initial capacity loss (ICL) due to more parasitic reactions. The higher ICL of the anode can cause significant Li inventory loss in a full cell, leading to a compromised energy density. As one way to mitigate such Li inventory loss, Li2O2 can be used as the cathode prelithiation additive to provide additional lithium. However, an additional catalyst is usually needed to lower its decomposition potential. In this work, we investigate the use of Li2O2 as the cathode prelithiation additive without the addition of a catalyst. Li2O2 decomposition is first demonstrated in coin half-cells with a calculated capacity of 1180 mAh/g obtained from Li2O2 decomposition. We then further demonstrate successful Li2O2 decomposition in single-layer pouch (SLP) full cells and evaluate the initial electrochemical performance. Despite its moisture sensitivity, Li2O2 showed reasonable compatibility with dry-room handling. After dry-room handling, Li2O2 decomposition was observed with an onset potential of 4.29 V vs. SiOx anode in SLP cells. With Li2O2 addition, the utilization of the Li inventory from cathode active material was improved by 12.9%, and discharge DCR has reduced by 7% while the cells still deliver similar cell capacities.

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confidence: 99%

Decomposition of Li₂O₂ as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

Zhang

Jeong

Reinsma

et al. 2021

J. Electrochem. Soc.

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“…The Swagelok-type LAB test cell comprised the obtained air-electrode, Li metal foil (thickness: 0.5 mm, Honjo Metal Co., Ltd.) as the NE, a separator (Celgard1 2400), and 0.20 M LiN(SO 2 CF 3 ) 2 /diglyme (LiTFSI/G2) (H 2 O content: <30 ppm) as the electrolyte and was prepared in an argon-filled glove box (Miwa, MDB-1BK-NT1) with a dew point below ¹70°C. 38 The electrolyte was prepared by mixing LiTFSI (Kishida, 99.9%) and G2 (Tokyo Chemical Industry Co., Ltd.). For the discharge/charge cycle test, an applied current of 0.20 mA cm ¹2 and a maximum discharge/charge capacity of 0.50 mAh cm ¹2 were applied to the LAB cell across the cut-off voltage range of 2.0 to 4.5 V. To prevent the G2-based electrolyte solution from drying out, the LAB test cell was operated in a passive mode and supplied with pure O 2 gas.…”

Section: Lab Cell Performance and Air-electrode Evaluationmentioning

confidence: 99%

“…Therefore, continuing investigations into solid catalysts remain important to improve LAB systems. Recently, various solid catalyst morphologies have been proposed to include oxide nanotubes, 36 mesoporous nanowires, 37 and nanosheets, 38 and these composites with nano-carbon materials (carbon nanotubes, graphene, etc.). 39 The rationale is to increase the surface area, and concomitantly the number of catalytic sites to enhance the electron path.…”

Section: Introductionmentioning

confidence: 99%

Lanthanum Manganite-based Air Electrode Catalysts and Their Application to Lithium-air Batteries: Effects of Carbon Support Oxidation

et al. 2018

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Acid-treated Ketjen Black (a-KB) carbon supports were prepared to investigate how oxidation of the carbon surface influences La 0.6 Sr 0.4 MnO 3 (LSM) nanoparticle distribution, and conjugation to the carbon support. 30 wt.% LSMloaded a-KB (LSM/a-KB) materials were prepared as air-electrode catalysts for rechargeable lithium-air batteries (LABs). a-KB exhibited a significant degree of O-containing (C-O, COO) surface functional groups, which resulted in the formation of smaller LSM nanoparticles and enhanced homogeneity over the carbon support when compared with the pristine KB support. Consequently, C-O-Mn bonds were formed, which increased the Mn oxidation state, and concomitantly enhanced conjugation resulting in improved catalytic activity. Additionally, the overpotential was reduced during charging (Li 2 O 2 decomposition). Furthermore, LSM/a-KB enhanced the cyclability of the LAB test cell. Scanning electron microscopy observations revealed that LSM/a-KB efficiently decomposed the Li 2 O 2 deposition layer, even after the 15th charge cycle when compared with LSM/KB. The LSM/a-KB air-electrode exhibited a more homogeneous and smaller-sized (and/or amorphous) Li 2 O 2 deposition after discharging. Therefore, the oxidation of the carbon surface, resulting in enhanced LSM nanoparticle distribution on, and conjugation to, the a-KB surface, influences the homogeneity of the Li 2 O 2 deposition onto the support during the discharge process leading to its facile decomposition during the following charge process.

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“…However, the poor electric conductivity of MnO 2 is known to affect its performances . Recently, an effective way for boosting the electric conductivity of MnO 2 using carbonaceous materials, such as Ketjen Black, porous carbon, carbon nanotubes (CNTs)/carbon nanofibers, multiwalled CNTs, graphene oxide, and graphene, has been demonstrated . The carbon materials can improve the electronic conductivity as well as the surface area of the resultant composites and make MnO 2 catalysts to evenly distribute on the surface of carbon to expose more active sites.…”

Section: Introductionmentioning

confidence: 99%

An Amorphous MnO₂/Lithiated NiO Nanosheet Array as an Efficient Bifunctional Electrocatalyst for Iron Molten Air Batteries

et al. 2019

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Iron molten air battery is considered one of the promising batteries in next‐generation energy storage due to high theoretical specific energy density, cost efficiency, and environment‐friendly merits. Herein, an amorphous MnO2/lithiated NiO nanosheet array is grown directly on a highly conductive nickel foam substrate to use as a bifunctional electrocatalyst in iron molten air batteries. The advantages of the nanosheet array structure are having more highly exposed active sites for electrochemical reactions, as well as a conductive stable 3D framework for allowing barrier‐free diffusion and transport of ions and oxygen gas. As a result, the amorphous MnO2/lithiated NiO nanosheet array exhibits a promising catalytic activity for oxygen evolution reaction and oxygen reduction reaction with a voltage gap of only 0.29 V. The as‐assembled iron molten air battery shows an impressive rechargeability with the highest coulombic efficiency of nearly 100% through 200 cycles with an average discharge potential of ≈1.14 V at 500 °C. Moreover, the cell has a high rate response up to 6.7 C with a discharge voltage of above 0.9 V. The study achieves critical advances for iron molten air batteries without the use of precious metals in contrast with previous results using the Pd‐based catalyst.

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A New Concept of an Air-Electrode Catalyst for Li2O2 Decomposition Using MnO2 Nanosheets on Rechargeable Li-O2 Batteries

Cited by 10 publications

References 52 publications

Decomposition of Li₂O₂ as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

Decomposition of Li₂O₂ as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

Lanthanum Manganite-based Air Electrode Catalysts and Their Application to Lithium-air Batteries: Effects of Carbon Support Oxidation

An Amorphous MnO₂/Lithiated NiO Nanosheet Array as an Efficient Bifunctional Electrocatalyst for Iron Molten Air Batteries

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A New Concept of an Air-Electrode Catalyst for Li2O2 Decomposition Using MnO2 Nanosheets on Rechargeable Li-O2 Batteries

Cited by 10 publications

References 52 publications

Decomposition of Li2O2 as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

Decomposition of Li2O2 as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

Lanthanum Manganite-based Air Electrode Catalysts and Their Application to Lithium-air Batteries: Effects of Carbon Support Oxidation

An Amorphous MnO2/Lithiated NiO Nanosheet Array as an Efficient Bifunctional Electrocatalyst for Iron Molten Air Batteries

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Decomposition of Li₂O₂ as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

Decomposition of Li₂O₂ as the Cathode Prelithiation Additive for Lithium-Ion Batteries without an Additional Catalyst and the Initial Performance Investigation

An Amorphous MnO₂/Lithiated NiO Nanosheet Array as an Efficient Bifunctional Electrocatalyst for Iron Molten Air Batteries