Enhancing the lithium ion diffusivity in LiMn2O4−ySy cathode materials through potassium doping

Bakierska, Monika; Świętosławski, Michał; Chudzik, Krystian; Lis, Marcelina; Molenda, Marcin

doi:10.1016/j.ssi.2018.01.014

Cited by 28 publications

(16 citation statements)

References 17 publications

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“…Flux is proportional to the diffusion coefficient and concentration gradient, according to Fick’s first law. Several studies have been conducted on increasing the diffusion coefficient to improve the Li-ion flux. − However, the diffusion coefficient was the same for both the foil and powder anode cells because the cathode was not modified. Accordingly, the difference in the Li + concentration gradient at the cathode surface between the foil and powder anode cells was investigated by introducing diffusion-limited current density ( i lim ). − The diffusion-limited current density represents the current density when the current is determined by mass transfer rather than charge transfer, considering a region where the overvoltage is significantly high (eq ).…”

Section: Resultsmentioning

confidence: 99%

“…The capacity of the cell can be increased by improving the Li-ion flux at the cathode interface. To enhance the Li-ion flux, various approaches such as doping, coating, and morphology control have been carried out, in which the Li-ion diffusion coefficient, a parameter of flux according to Fick’s law , − has been improved. The main purpose of the present research is to understand the reason for capacity increase in cells when using a Li-powder anode.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Capacity of Lithium Secondary Batteries Using a Li-Powder Anode

Lee

Yoon

2021

ACS Appl. Energy Mater.

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Li−graphite and Li−O 2 cells were investigated to increase their capacity, similar to that reported for other Li-powder anode-based cells such as Li−V 2 O 5 , Li−LiV 3 O 8 , and Li−sulfur batteries. When a Li-powder anode was used instead of a Li-foil anode in a Li−graphite cell, there was an increase of approximately 8% in the discharge capacity at a 0.1C rate. In a Li−O 2 cell, the Lipowder anode showed an enhancement capacity of approximately 20%, as well as improved cycle performance and lower discharge/ charge overpotential compared to the Li-foil anode. To explain the enhanced capacity obtained using the Li-powder anode, the exchange current density and Li + concentration gradient at the cathode surface were calculated using electrochemical methods such as linear sweep voltammetry and cyclic voltammetry. The Li powder caused an increase in the exchange current density, which enhanced the Li-ion concentration gradient at the surface of the cathode. Therefore, the increase in cell capacity can be attributed to an enhanced Li + flux due to the higher Li + concentration gradient at the surface of the cathode. X-ray photoelectron spectroscopy and scanning electron microscopy results indicate that the Li-powder anode not only suppressed side reactions in the electrolyte but also promoted uniform lithium peroxide deposition on the cathode of the Li−O 2 cell.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Capacity of Lithium Secondary Batteries Using a Li-Powder Anode

Lee

Yoon

2021

ACS Appl. Energy Mater.

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“…Decreasing the particle size has a limitation due to increased surface area for side reactions as discussed in Section 3.3.1.2. Enhancing the diffusivity on the other hand can be beneficial both in minimizing heat of mixing and in improving electrochemical performance through enhanced kinetics [170,243]. Because of the electrochemical aspect of enhancing the kinetics, numerous works have already been done in increasing the lithium diffusivity in the electrode materials [170,[243][244][245].…”

Section: Heat Of Mixingmentioning

confidence: 99%

“…Enhancing the diffusivity on the other hand can be beneficial both in minimizing heat of mixing and in improving electrochemical performance through enhanced kinetics [170,243]. Because of the electrochemical aspect of enhancing the kinetics, numerous works have already been done in increasing the lithium diffusivity in the electrode materials [170,[243][244][245]. Therefore, the same strategies can be suggested to reduce the heat of mixing.…”

Section: Heat Of Mixingmentioning

confidence: 99%

A review of thermal physics and management inside lithium-ion batteries for high energy density and fast charging

Zeng

Chalise

Lubner

et al. 2021

Energy Storage Materials

129

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Traditionally it has been assumed that battery thermal management systems should be designed to maintain the battery temperature around room temperature. That is not always true as Lithium-ion battery (LIB) R&D is pivoting towards the development of high energy density and fast charging batteries. Therefore, it is necessary to have a comprehensive review of thermal considerations for LIBs targeted for high energy density and fast charging, i.e., the optimal thermal condition, thermal physics (heat transport and generation) inside the battery, and thermal management strategies. As the energy density and charge rate increases, the optimal battery temperature can shift to be higher than room temperature. To improve the temperature uniformity and avoid excessive internal temperature rise, heat transfer inside the battery needs to be enhanced, and reducing the thermal contact resistance between the electrodes and separator can significantly increase the effective thermal conductivity of batteries. In the first part of the review various challenges and latest developments related to thermal transport and properties of LIBs are discussed. In the second part of the review various sources of heat generation inside LIBs and various approaches to minimizing battery heat generation are summarized. The importance of heat of mixing due to ion diffusion during fast charging is also highlighted. Finally, a summary of latest advancement on smart control of internal temperature of LIBs is discussed as depending on the ambient temperature and the optimal temperature; the battery heat needs to be retained or dissipated to elevate or avoid temperature rise. Lithium-ion battery; Optimal battery temperature; High energy density; Fast charging; Battery thermal management

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“…[14] The most commonly applied approach focuses on a partial substitution of Mn 3+ ions with other metal ions, for example, Mg, Al, Ni, Zn, Ti, Fe, Co, Cu, and Cr, leading to a stabilization of the spinel structure. [15][16][17] Nonetheless, properties of LMO and LMNO are still far behind most promising cathode materials such as Li-rich layered oxides or Li-rich disordered rock salt type compounds, intensively investigated in the last few years due to the discovery of the mixed redox reactions in those systems, which include the reversible reaction of oxygen anions in bulk. [18][19][20][21][22] Cationic-and anionic-redox (CAR) active compounds, in theory, can far exceed the capacity of 250 mAh g −1 thanks to the activation of reversible oxidation and reduction of O 2anions and formation of O 2 n− dimers/localized electron holes.…”

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confidence: 99%

Reversible Cation‐Mediated Anionic Redox in Defect Spinel Structure for High Power Batteries

Bakierska

Chudzik

Świętosławski

et al. 2021

Adv Funct Materials

Self Cite

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With ever-increasing energy demand, more efforts are dedicated to designing innovative electrode materials providing higher storage capability and power output. As it has been demonstrated recently, the use of mixed cation-anion redox reactions opens up new possibilities for the significant rise of material's capacity and unusual electrochemical characteristics of lithium-ion battery electrodes. In this paper, a new type of fast cation-mediated anionic redox reaction in the 3D spinel structure is presented. Li 0.98 K 0.01 Mn 1.86 Ni 0.11 O 4 shows 170% of stoichiometric spinel theoretical capacity without voltage hysteresis or significant capacity and voltage fading attributed to limitations of reversible anionic redox. The authors' sol-gel-derived defect spinel structure can deliver 250 mAh g −1 at 1C and retain 64% of this capacity under a high 50C current rate. The observed electrochemical process shows the reversibility unseen before in mixed cation-anion redox cathode materials for Li-ion systems.

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Enhancing the lithium ion diffusivity in LiMn2O4−ySy cathode materials through potassium doping

Cited by 28 publications

References 17 publications

Enhanced Capacity of Lithium Secondary Batteries Using a Li-Powder Anode

Enhanced Capacity of Lithium Secondary Batteries Using a Li-Powder Anode

A review of thermal physics and management inside lithium-ion batteries for high energy density and fast charging

Reversible Cation‐Mediated Anionic Redox in Defect Spinel Structure for High Power Batteries

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