Novel Carbon Materials in the Cathode Formulation for High Rate Rechargeable Hybrid Aqueous Batteries

Zhu, Xiao; Hoang, Tuan K.A.; Chen, Pu

doi:10.3390/en10111844

Cited by 9 publications

(6 citation statements)

References 100 publications

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“…The galvanostatic charge/discharge curves of the cLMO–scMO cathodes in an ReHAB is shown in Figure 2 a, where the anode is zinc metal that exhibits low redox potential, good reversibility and high overpotential for hydrogen evolution in acidic solutions . Under an average operating voltage of 1.75 V, reversible capacities of 200 and 218 mAh g −1 at 1 C in the initial two cycles were obtained, corresponding to energy densities of 350 and 381 Wh g −1 , respectively, much higher than the previously reported values in aqueous lithium‐ion batteries .…”

Section: Resultsmentioning

confidence: 85%

Unveiling Conversion Reaction on Intercalation‐Based Transition Metal Oxides for High Power, High Energy Aqueous Lithium Battery

Zhi

Han

et al. 2018

Advanced Energy Materials

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required for the operation of dangerous flammable electrolytes inevitably incur substantial cost, which introduces more difficulties in fabrication of large scale energy storage systems. [5] To tackle these safety and sustainability concerns at their roots, aqueous lithium-ion batteries (ALiBs) were first proposed in 1994, and has since drawn significant attention. [6][7][8] However, due to limited practical capacity of cathode materials based on Li + intercalation mechanism (between 110 and 140 mAh g −1 ) [9,10] and the narrow electrochemical stability window (avoiding hydrogen and oxygen evolution, generally not exceeding 1.2 V), [11,12] the package-level energy density, even in its ceiling value is normally less than 50 Wh kg −1 , which cannot meet the requirements of commercial electrical vehicles, such as Nissan Leaf and Tesla Model S. [13,14] It has been also reported that based on Li + adsorption mechanism on both sides of MnO 2 monolayer, a high theoretical capacity up to 616 mAh g −1 can be obtained. [15] However, this value is only on the basis of first-principles calculations, and more experimental evidence is needed. As a result, breakthroughs in performance of ALiBs are required, which may only come from the development of novel concepts in energy storage mechanism, probably different from intercalation chemistry.Recently, conversion reactions in transition metal oxide structures (e.g., MnO x , CoO x , and CuO x ) with Li + have been reported to show a large, rechargeable capacity in lithium-ion cells of organic electrolytes. [16][17][18] The specific capacity of these materials can be as high as 1000 mAh g −1 (about seven times that of common Li + intercalation materials), [19] which can potentially boost the energy density of lithium-ion batteries. However, in contrast to that of organic electrolyte systems where cathode and anode materials often operate under high conversion potentials, [20] the operating potential window in aqueous electrolyte batteries is far below the thermodynamic voltage limit of cathode and anode materials. [19] Therefore, a conversion reaction between transition metal oxides and alkaline metals (or ions) in ALiBs has been believed impossible. [21,22] In this study, against the conventional belief, we report that a reversible conversion reaction can happen between Li + and semicrystalline MnO 2 (scMO) prepared from a conventional Aqueous lithium batteries are reaching their energy and power limits partly due to limited capacity from intercalation chemistry. Alternatively, conversion reactions bring added capacity that can significantly increase the capacity ceiling of the cell. However, such reactions can only be realized in organic electrolytes, and similar redox chemistry in aqueous lithium batteries is not reported yet. In this work, it is discovered that a large work function difference (up to 1.78 eV) between crystalline LiMn 2 O 4 (cLMO) and semicrystalline MnO 2 (scMO) makes energy bands of MnO 2 bend downward toward their interface, resulting in the accumulation of f...

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Section: Resultsmentioning

confidence: 85%

Unveiling Conversion Reaction on Intercalation‐Based Transition Metal Oxides for High Power, High Energy Aqueous Lithium Battery

Zhi

Han

et al. 2018

Advanced Energy Materials

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“…This enhances the electrode stability. Therefore, PG may become a promising additive among carbon materials , and exhibit promising application in hybrid aqueous Zn/LiMn 2 O 4 batteries and other nonaqueous batteries.…”

Section: Resultsmentioning

confidence: 99%

Tuning Microstructures of Graphene to Improve Power Capability of Rechargeable Hybrid Aqueous Batteries

Zhu

Hoang

Tan

et al. 2018

ACS Appl. Mater. Interfaces

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Low conductivity and structural degradation of LiMn2O4 lead to poor power capability and severe capacity fading of hybrid aqueous Zn/LiMn2O4 battery. Here, we propose an effective strategy by tuning the microstructures of graphene to optimize its electrical and interfacial properties and electrode dynamics of LiMn2O4/graphene cathodes, which successfully prompt significant improvements in electrical conductivity and structural stability, thus essentially leading to a promising electrochemical performance. More importantly, it reveals different electrochemical properties prompted by different conductivity, which mainly depends on the microstructures of graphene. This dependence is due to the influence of electronic channels and conductive paths on the conductivity of LiMn2O4/graphene electrodes. A well-designed mesoporous graphene composed of about two graphene-layers exhibits an excellent high-rate performance; even after 300 cycles, a highly reversible capacity of 75 mAh g–1 is retained at 4C rate. The results of this study suggest that the structural tuning of electronic channels of graphene can be used as an effective means to improve the performance of LiMn2O4 cathodes in hybrid aqueous batteries.

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“…LiMn 2 O 4 /graphene composite electrodes were proposed as suitable cathode materials for Li-ion batteries [168,169,179,[185][186][187][188][189][190]. The unique and amazing graphene properties, such as high electrical conductivity, thermal and mechanical stability and high surface area, provided an efficient method for improving lithium manganese oxide's electrochemical properties [14,167,168,189,191]. Brief characteristics about the electrochemical behavior of lithium manganese oxide/graphene composite materials are presented in Table 8, while a more advanced description about graphene influence on LIB's cathode materials has been described elsewhere [192].…”

Section: Carbonmentioning

confidence: 99%

Enhancing Lithium Manganese Oxide Electrochemical Behavior by Doping and Surface Modifications

Marincaş

Ilea

2021

Coatings

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Lithium manganese oxide is regarded as a capable cathode material for lithium-ion batteries, but it suffers from relative low conductivity, manganese dissolution in electrolyte and structural distortion from cubic to tetragonal during elevated temperature tests. This review covers a comprehensive study about the main directions taken into consideration to supress the drawbacks of lithium manganese oxide: structure doping and surface modification by coating. Regarding the doping of LiMn2O4, several perspectives are studied, which include doping with single or multiple cations, only anions and combined doping with cations and anions. Surface modification approach consists in coating with different materials like carbonaceous compounds, oxides, phosphates and solid electrolyte solutions. The modified lithium manganese oxide performs better than pristine samples, showing improved cyclability, better behaviour at high discharge c-rates and elevated temperate and improves lithium ions diffusion coefficient.

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Novel Carbon Materials in the Cathode Formulation for High Rate Rechargeable Hybrid Aqueous Batteries

Cited by 9 publications

References 100 publications

Unveiling Conversion Reaction on Intercalation‐Based Transition Metal Oxides for High Power, High Energy Aqueous Lithium Battery

Unveiling Conversion Reaction on Intercalation‐Based Transition Metal Oxides for High Power, High Energy Aqueous Lithium Battery

Tuning Microstructures of Graphene to Improve Power Capability of Rechargeable Hybrid Aqueous Batteries

Enhancing Lithium Manganese Oxide Electrochemical Behavior by Doping and Surface Modifications

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