Metal-Based Electrocatalysts for High-Performance Lithium-Sulfur Batteries: A Review
Abstract
:1. Introduction
2. Electrocatalysis of Intermediate LiPS
3. Metals-Sulfide Interactions in the Electrocatalysis of LiPS Redox Reaction
4. Metal Oxide-Sulfide Interactions in Electrocatalysis of LiPS Redox Reactions
5. Metal Sulfides-Sulfide Interactions in Electrocatalysis of LiPS Redox Reactions
6. Metal Carbide-Sulfide Interactions in Electrocatalysis of LiPS Redox Reactions
7. Summary and Outlook
- (i)
- As the intermediate LiPS forms with different chain lengths during the reactions and undergoes manifold (electro) chemical transformations, their binding strength varies from surface to surface. In such circumstances, the cathode surfaces no longer can offer a ubiquitous anchoring effect towards all the intermediate LiPS, and subsequently, some tend to undergo dissolution. Exploring the design principle for anchoring of LiPS on the cathode substrates that are capable of adsorbing all the intermediate LiPS while catalyzing the subsequent redox reactions is imperative to completely restrain the PS shuttle.
- (ii)
- The catalysts with high surface area and exceptional electronic conductivity need to be developed to promote Li+ transportation in the inner parts of cathodes to access the active materials while facilitating the redox conversion reaction. This could provide an opportunity to achieve high sulfur loading with low electrolyte/sulfur ratio to realize high energy density Li-S batteries. Besides, maximizing the sulfur loading without compromising on the electrocatalytic activity holds the key to realize the effective utilization of the electrocatalysts and, ultimately, high energy density Li-S batteries. Additionally, catalytic cathodes should have a rigid structure with enough porosity to enable uniform distribution of active materials and accommodate volume changes during charge/discharge.
- (iii)
- An in-depth understanding of the phenomenon occurring at the electrode/electrolyte interface with theoretical and sophisticated in situ measurements is vital to understand the interactions of LiPS with the catalytic cathodes in real-time. This could reveal essential information such as the nature of such interactions, LiPS reaction pathways on catalyst cathodes during the entire reactions, etc., which are essential to elucidate the accelerated reversible redox pathways of sulfur redox reactions.
Author Contributions
Funding
Conflicts of Interest
References
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Control Material and Electrocatalytic Electrode | Cathodic Exchange Current Density (mA cm−2) | Anodic Exchange Current Density (mA cm−2) | Cathodic Peak Position for Li2S8→Li2S4 (V vs. Li/Li+) | Cathodic Peak Position for Li2S4→Li2S/Li2S2 (V vs. Li/Li+) | Ref. |
---|---|---|---|---|---|
Carbon Ni | 0.049 0.071 | - - | 2.40 2.43 | 1.84 1.94 | [60] |
Graphene Pt on graphene | 1.18 3.18 | 0.17 0.25 | 2.42 2.45 | 1.93 1.96 | [61] |
CNF CNT + CNF Mo + CNT+ CNF | 24 × 10−3 35 × 10−3 75 × 10−3 | - | - | ~2.07 ~2.08 2.11 | [72] |
PG Fe2O3 on PG | 2.28 3.46 | 4.81 4.96 | 2.32 2.35 | 2.03 2.04 | [73] |
NC CeO2 on NC | - - | - - | ~2.22 2.27 | ~1.95 2.01 | [74] |
Carbon WS2 | 8.5 × 10−3 11.8 × 10−3 | - - | 2.21 2.24 | 1.67 1.78 | [62] |
Graphene CoS2/graphene | - | - | 2.09 2.25 | 1.81 2.00 | [59] |
Carbon cloth FeCo2S4 | - | - | 2.30 2.32 | 2.05 1.98 | [75] |
Carbon TiC | - | - | 2.38 2.45 | 1.91 1.95 | [76] |
CNF W2C-CNF | - | - | 2.35 2.41 | 2.04 2.08 | [77] |
NS-PC TiC-NS-PC | 31.28 × 10−3 42.35 × 10−3 | 9.29 × 10−3 12.65 × 10−3 | 2.27 2.34 | - | [78] |
Material | Li2S (eV) | Li2S4 (eV) | Li2S6 (eV) | Li2S8 (eV) | S8 (eV) | Ref. | |
---|---|---|---|---|---|---|---|
Non-metal | Graphene | 0.65 | 0.72 | 0.93 | 1.10 | 0.89 | [73] |
Metal | Gold nanoparticles | 1.81 | - | - | - | - | [69] |
Co-Fe-P | - | - | −3.92 (Co-S) −7.40 (FeP2) | - | - | [71] | |
Bismuth | −2.36 | −0.45 | −0.32 | −0.39 | - | [94] | |
Metal oxides | Fe2O3 | 4.85 | 4.09 | 4.11 | 3.78 | 2.04 | [73] |
Ceo2 | −1.96 | −2.90 | −5.48 | −5.63 | −2.42 | [74] | |
LiNi0.8Co0.1Mn0.1O2 | - | - | −2.25 | - | - | [95] | |
Metal Sulfides | CoS2 | - | 1.97 | - | - | - | [59] |
Fe7S8 | - | −4.25 | −4.33 | −5.00 | - | [96] | |
Ni3S2 | 4.89 | 2.29 | 2.15 | 1.92 | 1.09 | [97] | |
Co3S4 | - | 2.26 | 1.61 | 1.68 | - | [98] | |
1T-MoS2 | ~1.25 | ~1.15 | ~1.30 | ~1.45 | ~1.28 | [99] | |
MoS2 | 0.87 | 0.32 | 0.22 | 0.10 | 0.05 | [100] | |
FeCo2S4 | −6.61 | −4.50 | −3.94 | −5.21 | - | [75] | |
Metal Carbides | TiC | - | - | - | 3.68 | - | [76] |
TiC-N-S-C | −3.80 | −4.00 | −2.00 | −3.50 | - | [78] | |
W2C | - | - | −2.57 | - | - | [77] | |
B4C (100) facet | - | 12.51 | - | - | -- | [101] |
Electrocatalyst | Sulfur Loading (mg cm−2) | C-Rate | Discharge Capacity (mAh g−1) | Cycles | CE (%) | Ref. | |
---|---|---|---|---|---|---|---|
Metals | Co-Fe-P | 1 | 0.2 | 1118 | 100 | 100 | [71] |
1 | 1 | 863 | 500 | 100 | |||
3.7 | 0.2 | ~1100 | 100 | ~100 | |||
5.5 | 0.2 | ~890 | 100 | ~100 | |||
Mo nanoclusters | 1.91 | 1 | ~1100 | 500 | 99.6 | [72] | |
7.64 | 0.2 | ~800 | 100 | - | |||
Co in Nitrogen doped graphene | 2 | 1 | 866 | 500 | ~99.6 | [114] | |
6 | 0.2 | ~5.1 mAh cm−2 | 100 | - | |||
Fe-N-C | 2.5 | 0.5 | 1631 | 100 | 95 | [115] | |
5.2 | 3 | 483 | 500 | - | |||
Metal oxides | LiNi0.8Co0.1Mn0.1O2 | 0.7 | 0.1 | 1264.3 | 500 | 99.22 | [95] |
4.29 | 0.1 | ~700 | 120 | - | |||
Co9S8-CoO | 1 | 1 | 956 | 300 | ~100 | [116] | |
2.5 | 1 | 925 | 1000 | ~100 | |||
Metal sulfides | Fe1−xS | - | 0.5 | 1070 | 200 | ~100 | [96] |
- | 1 | 793 | 200 | - | |||
8.14 | 0.05 | 7.4 mAh cm−2 | 60 | - | |||
Ni3S2 | 4 | 1 mA cm−2 | 655 | 80 | ~95 | [97] | |
4 | 4 mA cm−2 | 441 | 150 | - | |||
MoS2 | 1 | 0.2 | 954 | 150 | 99.5 | [117] | |
1 | 2 | ~750 | 1000 | ~100 | |||
3.6 | 0.2 | 714 | 110 | - | |||
Metal carbides | Ti3C2 | 1.2–1.5 | 0.5 | 1180 | 200 | 99 | [118] |
1.2–1.5 | 1 | 530 | 500 | ~100 | |||
1 | 1 | 610 | 200 | ~100 | |||
2.5 | 1 | 475 | 200 | ~100 | |||
MoC1−x | 2 | 800 mA g−1 | 1000 | 500 | ~98 | [119] | |
2 | 1600 mA g−1 | 900 | 200 | - | |||
4 | 1.6 mA cm−2 | 2.6 mAh cm−2 | 100 | 88 | |||
6 | 1.6 mA cm−2 | 3.6 mAh cm−2 | 100 | 91 | |||
Mo2C | 1.5–1.8 | 0.5 | 1206 | 100 | ~100 | [120] | |
1.5–1.8 | 2 | 802 | 900 | ~100 | |||
2.5 | 1 | 835 | 100 | ~100 |
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Mahankali, K.; Nagarajan, S.; Thangavel, N.K.; Rajendran, S.; Yeddala, M.; Arava, L.M.R. Metal-Based Electrocatalysts for High-Performance Lithium-Sulfur Batteries: A Review. Catalysts 2020, 10, 1137. https://doi.org/10.3390/catal10101137
Mahankali K, Nagarajan S, Thangavel NK, Rajendran S, Yeddala M, Arava LMR. Metal-Based Electrocatalysts for High-Performance Lithium-Sulfur Batteries: A Review. Catalysts. 2020; 10(10):1137. https://doi.org/10.3390/catal10101137
Chicago/Turabian StyleMahankali, Kiran, Sudhan Nagarajan, Naresh Kumar Thangavel, Sathish Rajendran, Munaiah Yeddala, and Leela Mohana Reddy Arava. 2020. "Metal-Based Electrocatalysts for High-Performance Lithium-Sulfur Batteries: A Review" Catalysts 10, no. 10: 1137. https://doi.org/10.3390/catal10101137