Advantages of blending LiNi0.8Co0.2O2 into Li1+xMn2−xO4 cathodes

Numata, Tatsuji; Amemiya, Chika; Kumeuchi, Tomokazu; Shirakata, Masato; Yonezawa, Masatomo

doi:10.1016/s0378-7753(01)00753-4

Cited by 84 publications

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“…An increase of HF concentration was also observed in the electrolyte storage LMO electrode at room and high temperature. 10,11 Although Mn dissolution was considered to be the critical factor of capacity fading, experimental work found that the capacity losses caused by Mn dissolution alone cannot account for all the capacity fading. 12 Furthermore, factors causing capacity loss may not occur * Electrochemical Society Fellow.…”

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confidence: 99%

Capacity Fade Model for Spinel LiMn₂O₄Electrode

Dai

Cai

White

2012

J. Electrochem. Soc.

123

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A mathematical model for the capacity fade of a LiMn2O4 (LMO) electrode is developed in this paper by including the acid attack on the active material and the solid electrolyte interphase (SEI) film formation on the LMO particle surface. The acid generated by the LiPF6 and the solvent decompositions are coupled to the manganese (Mn) dissolution. The decrease of the Li ion diffusion coefficient is involved as another contribution to the capacity fade, which is caused by the passive film formation on the active material surface. The effects of cell practical operation/fabrication conditions and kinetics of side reactions on battery life are also investigated by utilizing the developed mathematical model.

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confidence: 99%

Capacity Fade Model for Spinel LiMn₂O₄Electrode

Dai

Cai

White

2012

J. Electrochem. Soc.

123

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“…Earlier, it has been shown that some disadvantages of cathode materials can be overcome by the preparation of physical blends of these components in blenders [6][7][8]. In the present study, LiCoO 2 and LiMn 2 O 4 were jointly activated in a high-energy AGO-2 planetary mill.…”

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confidence: 73%

Synthesis of novel nanostructured composite cathode materials for lithium-ion batteries using mechanical activation

Косова

Devyatkina

2014

Dokl Chem

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on lithium-ion batteries (LIBs). One of the promising approaches to the optimization of their properties is in the development of new blended composite electrode materials consisting of two (or more) active components in order to use the advantages of the both of them [1]. Due to a unique combination of properties, the mixed materials show some advantages over the individual components. This includes the longer lifetime, the decreased capacity fading upon the cycling, lower price, the improved thermal stability, more acceptable profiles of charge-discharge curves and operating voltage, etc. For instance, the cathode materials with a layered structure (LiCoO 2 ) have a high Coulomb capacity and good electrochemical properties, but are expensive and thermally unstable. On the contrary, cathode materials with a spinel structure (LiMn 2 O 4 ) are characterized by high thermal stability and good cycleability, but show lower capacity. Mixing these two cathode materials minimizes their disadvantages, and the composite material is characterized by high energy or power, along with higher stability and lower price.In the present work, we formulate the new approaches to the development of novel composite electrode materials for LIB, using the mechanical activation method (MA). MA with high-energy mechanoactivators is a modern energy-and eco-efficient method of fine grinding, mixing, and activation of solid reagents and is widely used to prepare different functional materials [2,3]. As an example, we report the results of studying the synthesis, structure, morphology, and electrochemical properties of the composite cathode materials prepared by different procedures: 1) joint MA of two individual cathode materials (the LiCoO 2 /LiMn 2 O 4 composites); 2) direct mechanochemically assisted solid state synthesis starting from a multicomponent mixture of reagents (LiFePO 4 /Li 3 V 2 (PO 4 ) 3 composites); 3) synthesis via heatinduced partial decomposition of a single-phase nanosized cathode material, prepared by MA,

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“…The concept of using two or more electrochemically active materials in a blend matrix is not new; since 1976, Margalit suggested applying xAg 3 PO 4¨( 1´x)Ag 2 CrO 4 to a Li primary battery for pacemakers and watches [3]. This concept has been extended to numerous cathode materials to avoid their individual drawbacks [4][5][6][7]. Pynenburg et al [4] patented a rechargeable lithium cell composed of a physical mixture of spinel Li O 4 , so that mixing the two elements should lead to an optimized compromise [5,7].…”

Section: Introductionmentioning

confidence: 99%

“…This concept has been extended to numerous cathode materials to avoid their individual drawbacks [4][5][6][7]. Pynenburg et al [4] patented a rechargeable lithium cell composed of a physical mixture of spinel Li O 4 , so that mixing the two elements should lead to an optimized compromise [5,7]. Other effects not necessarily expected have been observed.…”

Section: Introductionmentioning

confidence: 99%

“…Other effects not necessarily expected have been observed. Numata et al [5] showed the advantages of blending Li 1+x Mn 2´x O 4¨L iNi 0.8 Co 0.15 Al 0.05 O 2 , which decreased the Mn dissolution from the spinel into the electrolyte. Meanwhile, however, it increased the irreversible capacity loss in the first cycle and deteriorated the rate capability.…”

Section: Introductionmentioning

confidence: 99%

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Olivine-Based Blended Compounds as Positive Electrodes for Lithium Batteries

et al. 2016

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Blended cathode materials made by mixing LiFePO 4 (LFP) with LiMnPO 4 (LMP) or LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC) that exhibit either high specific energy and high rate capability were investigated. The layered blend LMP-LFP and the physically mixed blend NMC-LFP are evaluated in terms of particle morphology and electrochemical performance. Results indicate that the LMP-LFP (66:33) blend has a better discharge rate than the LiMn 1´y Fe y PO 4 with the same composition (y = 0.33), and NMC-LFP (70:30) delivers a remarkable stable capacity over 125 cycles. Finally, in situ voltage measurement methods were applied for the evaluation of the phase evolution of blended cathodes and gradual changes in cell behavior upon cycling. We also discuss through these examples the promising development of blends as future electrodes for new generations of Li-ion batteries.

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Advantages of blending LiNi0.8Co0.2O2 into Li1+xMn2−xO4 cathodes

Cited by 84 publications

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Capacity Fade Model for Spinel LiMn₂O₄Electrode

Capacity Fade Model for Spinel LiMn₂O₄Electrode

Synthesis of novel nanostructured composite cathode materials for lithium-ion batteries using mechanical activation

Olivine-Based Blended Compounds as Positive Electrodes for Lithium Batteries

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Advantages of blending LiNi0.8Co0.2O2 into Li1+xMn2−xO4 cathodes

Cited by 84 publications

References 0 publications

Capacity Fade Model for Spinel LiMn2O4Electrode

Capacity Fade Model for Spinel LiMn2O4Electrode

Synthesis of novel nanostructured composite cathode materials for lithium-ion batteries using mechanical activation

Olivine-Based Blended Compounds as Positive Electrodes for Lithium Batteries

Contact Info

Product

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Capacity Fade Model for Spinel LiMn₂O₄Electrode

Capacity Fade Model for Spinel LiMn₂O₄Electrode