Cathode Performance of Co-Doped Li<sub>2</sub>O with Specific Capacity (400 mAh/g) Enhanced by Vinylene Carbonate

Kobayashi, Hiroaki; Hibino, Mitsuhiro; Kubota, Yuki; Ogasawara, Yasushi; Yamaguchi, Kazuya; Kudo, Tetsuichi; Okuoka, Shin Ichi; Ono, Hironobu; Yonehara, Koji; Sumida, Yasutaka; Mizuno, Noritaka

doi:10.1149/2.1291704jes

Cited by 21 publications

(33 citation statements)

References 20 publications

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“…In addition, the surface modification of CoDL by vinylene carbonate or fluoroethylene carbonate shows excellent capacity improvement from 270 to 450 mA h g À1 while retaining its cyclability. [50][51][52] Since TMDLs are basic and reactive with the electrolyte to decompose, such surface modification is also effective for enhancement of cathode performances.…”

Section: Effect Of Ni-doping To Lithium Oxidementioning

confidence: 99%

“…Contrarily, metal doping of Li 2 O effectively utilizes oxygen redox. Previous studies have reported that 5-10 mol% TM consisting of Fe, 46 Co, [47][48][49][50][51][52] Cu, 53 Rh, 47 and Ir 47 are substitutionally introduced to the cationic site of Li 2 O. The transition metal-doped Li 2 O (TMDL) cathodes exhibit a reversible solid-state oxygen redox reaction, along with a TM dopant redox reaction.…”

Section: Introductionmentioning

confidence: 99%

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Universal solid-state oxygen redox in antifluorite lithium oxidesviatransition metal doping

et al. 2020

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Section: Effect Of Ni-doping To Lithium Oxidementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Universal solid-state oxygen redox in antifluorite lithium oxidesviatransition metal doping

et al. 2020

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“…Moreover, Co-substituted Li 2 O shows a specific capacity of approximately 450 mA h g –1 . 4 − 9 It has been reported that Co-substituted Li 2 O follows eq 1 during the charge–discharge process. However, Co-substituted Li 2 O decomposes according to eq 2 when overcharged.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Characteristics of Co-Substituted α- and β-Li₅AlO₄ as High-Specific Capacity Positive Electrode Materials

2020

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Electric vehicles and hybrid electric vehicles require batteries with higher energy densities than conventional batteries. Anion redox-type active materials have been proposed as new high-capacity positive electrode materials for Li-ion batteries with high-energy densities. Co-substituted Li 5 AlO 4 is a novel and promising high-capacity positive electrode material for Li-ion batteries. In this study, we investigated the influence of different synthesis conditions on the enhancement of the specific capacity. The material prepared via mechanical alloying of β-Li 5 AlO 4 with LiCoO 2 at 300 rpm for 24 h exhibited a higher specific capacity than that prepared from α-Li 5 AlO 4 and LiCoO 2 . Co-substituted β-Li 5 AlO 4 demonstrated a specific capacity of approximately 250 mA h g –1 . The specific capacity of Co-substituted α and β-Li 5 AlO 4 increased with increasing Co content in the samples. According to X-ray absorption near edge structure measurements, the irreversible oxygen redox reaction and a reversible reaction involving the formation and consumption of peroxide were responsible for the charge compensation of Co-substituted β-Li 5 AlO 4 and α-Li 5 AlO 4 , respectively.

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“…In general, the capacity of commercial cathodes was not critically affected by the electrolyte additive, but the effect of the additive significantly enhanced the rate capability, cyclic performance, and efficiency of the cells. By contrast, some lithia-based cathodes showed improved available capacity through the addition of electrolyte additives [28][29] , a fairly unique outcome. In this work, the electrochemical performance of lithia/Li 2 RuO 3 nanocomposites through the addition of TMSB was carefully characterised.…”

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“…However, it is difficult to apply to lithia-based cathodes because a coating process utilising heat-treatment may significantly deteriorate lithia-based cathodes due to the extremely reactive lithia. Whereas, the use of electrolyte additives may be a promising solution to the interfacial problem of lithia-based cathodes [28][29] . The additives dissolve in the decomposed electrolyte during cycling to form a protective layer on the surface of the cathode.…”

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Enhanced electrochemical performance of lithia/Li2RuO3 cathode by adding tris(trimethylsilyl)borate as electrolyte additive

Lee

Park

2020

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in this study, we used tris(trimethylsilyl)borate (tMSB) as an electrolyte additive and analysed its effect on the electrochemical performance of lithia-based (Lithia/Li 2 Ruo 3) cathodes. our investigation revealed that the addition of TMSB modified the interfacial reactions between a lithia-based cathode and an electrolyte composed of the carbonate solvents and the Lipf 6 salt. the decomposition of the Lipf 6 salt and the formation of Li 2 co 3 and-CO 2 was successfully reduced through the use of tMSB as an electrolyte additive. it is inferred that the protective layer derived from the tMSB suppressed the undesirable side reaction associated with the electrolyte and superoxides (oor o 0.5-) formed in the cathode structure during the charging process. this led to the reduction of superoxide loss through side reactions, which contributed to the increased available capacity of the Lithia/Li 2 Ruo 3 cathode with the addition of tMSB. the suppression of undesirable side reactions also decreased the thickness of the interfacial layer, reducing the impedance value of the cells and stabilising the cyclic performance of the lithia-based cathode. This confirmed that the addition of TMSB was an effective approach for the improvement of the electrochemical performance of cells containing lithia-based cathodes. One of the most important issues relating to lithium-ion batteries (LIBs) is the development of new cathodes with higher energy densities than commercially used LiCoO 2 , Li(Ni, Co, Mn)O 2 (NCM), and Li(Ni, Co, Al)O 2 (NCA) 1-7. Fundamentally, the capacity of most cathodes can be attributed to the cationic redox of transition metals such as Co, Ni, and Mn in the structure. Therefore, it is necessary to increase the amount of transition metals (per weight or volume) in the cathode structure to improve its energy density, which is not an easy task considering the crystal structure of transition metal oxides. However, if the redox reaction of the anions (such as oxygen ions) can contribute to the capacity of the cathode, this problem can be overcome. The anions are much lighter than general transition ions, therefore the cathodes can provide much higher capacity (per weight) and energy density compared to cases relying on only cationic redox reactions. Subsequently, cathodes based on anionic redox reactions have been attractive research topics of late. As promising new cathode materials, Li-Nb-Mn-O, Li-Mn-O, and Li-RuM -O (M = Sn, Nb) have been studied for years 8-13. These materials have shown high capacity-up to approximately 300 mA•g −1 based on anionic redox associated with oxygen as well as cationic redox related to transition metals. However, their sluggish kinetics and structural instability have resulted in an inferior rate capacity and cyclic performance compared to commercial cathodes 8-13. Lithia (Li 2 O)-based materials are also one of the new candidates for high-capacity cathodes based on anionic redox reactions 14-20. In fact, most of the new cathodes such as Li-Nb-Mn-O, Li-Mn-O, and Li-RuM -O (M = Sn, Nb)...

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Cathode Performance of Co-Doped Li₂O with Specific Capacity (400 mAh/g) Enhanced by Vinylene Carbonate

Cited by 21 publications

References 20 publications

Universal solid-state oxygen redox in antifluorite lithium oxidesviatransition metal doping

Universal solid-state oxygen redox in antifluorite lithium oxidesviatransition metal doping

Electrochemical Characteristics of Co-Substituted α- and β-Li₅AlO₄ as High-Specific Capacity Positive Electrode Materials

Enhanced electrochemical performance of lithia/Li2RuO3 cathode by adding tris(trimethylsilyl)borate as electrolyte additive

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Cathode Performance of Co-Doped Li2O with Specific Capacity (400 mAh/g) Enhanced by Vinylene Carbonate

Cited by 21 publications

References 20 publications

Universal solid-state oxygen redox in antifluorite lithium oxidesviatransition metal doping

Universal solid-state oxygen redox in antifluorite lithium oxidesviatransition metal doping

Electrochemical Characteristics of Co-Substituted α- and β-Li5AlO4 as High-Specific Capacity Positive Electrode Materials

Enhanced electrochemical performance of lithia/Li2RuO3 cathode by adding tris(trimethylsilyl)borate as electrolyte additive

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Cathode Performance of Co-Doped Li₂O with Specific Capacity (400 mAh/g) Enhanced by Vinylene Carbonate

Electrochemical Characteristics of Co-Substituted α- and β-Li₅AlO₄ as High-Specific Capacity Positive Electrode Materials