Dual functions of zirconium modification on improving the electrochemical performance of Ni-rich LiNi0.8Co0.1Mn0.1O2

Li, Xing; Zhang, Kangjia; Wang, Mingshan; Liu, Yang; Qu, Meizhen; Zhao, Wengao; Zheng, Jianming

doi:10.1039/c7se00513j

Cited by 143 publications

(69 citation statements)

References 47 publications

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“…In addition, with the development of modern society, lithium-ion batteries have gradually moved toward high specific energy. Researchers [2][3][4][5][6][7][8]. The energy density can be improved by increasing the charging voltage, which will lead to serious side reactions and safety issues.…”

Section: Introductionmentioning

confidence: 99%

Submicron-Sized Nb-Doped Lithium Garnet for High Ionic Conductivity Solid Electrolyte and Performance of Quasi-Solid-State Lithium Battery

et al. 2020

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The garnet Li7La3Zr2O12 (LLZO) has been widely investigated because of its high conductivity, wide electrochemical window, and chemical stability with regards to lithium metal. However, the usual preparation process of LLZO requires high-temperature sintering for a long time and a lot of mother powder to compensate for lithium evaporation. In this study submicron Li6.6La3Zr1.6Nb0.4O12 (LLZNO) powder―which has a stable cubic phase and high sintering activity―was prepared using the conventional solid-state reaction and the attrition milling process, and Li stoichiometric LLZNO ceramics were obtained by sintering this powder―which is difficult to control under high sintering temperatures and when sintered for a long time―at a relatively low temperature or for a short amount of time. The particle-size distribution, phase structure, microstructure, distribution of elements, total ionic conductivity, relative density, and activation energy of the submicron LLZNO powder and the LLZNO ceramics were tested and analyzed using laser diffraction particle-size analyzer (LD), X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Electrochemical Impedance Spectroscopy (EIS), and the Archimedean method. The total ionic conductivity of samples sintered at 1200 °C for 30 min was 5.09 × 10−4 S·cm−1, the activation energy was 0.311 eV, and the relative density was 87.3%. When the samples were sintered at 1150 °C for 60 min the total ionic conductivity was 3.49 × 10−4 S·cm−1, the activation energy was 0.316 eV, and the relative density was 90.4%. At the same time, quasi-solid-state batteries were assembled with LiMn2O4 as the positive electrode and submicron LLZNO powder as the solid-state electrolyte. After 50 cycles, the discharge specific capacity was 105.5 mAh/g and the columbic efficiency was above 95%.

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Section: Introductionmentioning

confidence: 99%

Submicron-Sized Nb-Doped Lithium Garnet for High Ionic Conductivity Solid Electrolyte and Performance of Quasi-Solid-State Lithium Battery

et al. 2020

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“…It was found that in most cases, surface coating,, and removal of Li residual compounds, not only improve the cycling stability but also enhance the rate capability of layered cathode materials. Without exceptions, however, all these treatments require additional precipitating (or washing) and heating processes, leading to an increase in the cost of battery manufacture.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance of Ni‐Rich Layered Cathode Materials by using LiPF₆ as a Cathode Additive

2019

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Residual Li compounds are inevitably present in the form of Li 2 O, LiOH, and Li 2 CO 3 on the surface of layered cathode materials, which not only causes slurry gelation in the cathodecoating process but also degrades liquid electrolyte in the batteries. Owing to their strong alkaline nature, the residual Li compounds can react with acidic LiPF 6 to form Li 3 PO 4 and LiF, two of the main components of robust solid electrolyte interphases. By demonstrating LiNi 0.80 Co 0.10 Mn 0.10 O 2 (NCM811) as an example in this work, we simply dissolved a small amount of LiPF 6 into the cathode-coating slurry, finding that as the amount of LiPF 6 is controlled in the 0.5-1.0 wt % range versus the mass of NCM811, the LiPF 6 additive not only improves the cycling stability but also enhances rate capability of the Li/ NCM811 cells. The former is because the strongly alkaline residual Li compounds react with acidic LiPF 6 to form stable Li 3 PO 4 and LiF. The latter is attributed to a reduction in the surface layer resistance on the cathode, as suggested by the results of surface chemistry and impedance analyses.[a] Dr.

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“…The calculated Li‐ion diffusion coefficient of the two electrodes are shown in Table 1 , with the calculation details being shown in Figure S13, Supporting Information. [ 40 ] Interestingly, both CC/1T‐MoS 2 and CC electrodes have stable Li ion diffusion coefficients that are on‐par. For CC/1T‐MoS 2 , they are 4.8 × 10 −10 , 3.6 × 10 −10 , and 3.2 × 10 −10 cm 2 s −1 after cycle 10, 50, and 500.…”

Section: Resultsmentioning

confidence: 99%

Stable Lithium Sulfur Battery Based on In Situ Electrocatalytically Formed Li₂S on Metallic MoS₂–Carbon Cloth Support

Wang

Shen

et al. 2020

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A stable lean‐electrolyte operating lithium–sulfur (Li–S) battery based on a cathode of Li2S in situ electrocatalytically deposited from L2S8 catholyte onto a support of metallic molybdenum disulfide (1T‐MoS2) on carbon cloth (CC) is created. The 1T‐MoS2 significantly accelerates the conversion Li2S8 catholyte to Li2S, chemically adsorbs lithium polysulfide (LiPSs) from solution, and suppresses crossover of the LiPSs to the anode. These experimental findings are explained by density functional theory calculations that show that 1T‐MoS2 gives rise to strong adsorption of polysulfides on its surface and is electrocatalytic for the targeted reversible Li–S conversion reactions. The CC/1T‐MoS2 electrode in a Li–S battery delivers an initial capacity of 1238 mAh g−1, with a low capacity fade of only 0.051% per cycle over 500 cycles at 0.5 C. Even at a high sulfur loading (4.4 mg cm−2) and low electrolyte/S (E/S) ratio of 3.7 µL mg−1, the battery achieves an initial reversible capacity of 1176 mA h g−1 at 0.5 C, with 87% capacity retention after 160 cycles. The post 500 cycles Li metal opposing 1T‐MoS2 is substantially smoother than the Li opposing CC, with XPS supporting the role of 1T‐MoS2 in inhibiting LiPSs crossover.

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Dual functions of zirconium modification on improving the electrochemical performance of Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂

Abstract: The main shortcomings of NCM811 could be solved at the same time via a facile Zr surface modification approach.

Cited by 143 publications

References 47 publications

Submicron-Sized Nb-Doped Lithium Garnet for High Ionic Conductivity Solid Electrolyte and Performance of Quasi-Solid-State Lithium Battery

Submicron-Sized Nb-Doped Lithium Garnet for High Ionic Conductivity Solid Electrolyte and Performance of Quasi-Solid-State Lithium Battery

Enhanced Electrochemical Performance of Ni‐Rich Layered Cathode Materials by using LiPF₆ as a Cathode Additive

Stable Lithium Sulfur Battery Based on In Situ Electrocatalytically Formed Li₂S on Metallic MoS₂–Carbon Cloth Support

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Dual functions of zirconium modification on improving the electrochemical performance of Ni-rich LiNi0.8Co0.1Mn0.1O2

Abstract: The main shortcomings of NCM811 could be solved at the same time via a facile Zr surface modification approach.

Cited by 143 publications

References 47 publications

Submicron-Sized Nb-Doped Lithium Garnet for High Ionic Conductivity Solid Electrolyte and Performance of Quasi-Solid-State Lithium Battery

Submicron-Sized Nb-Doped Lithium Garnet for High Ionic Conductivity Solid Electrolyte and Performance of Quasi-Solid-State Lithium Battery

Enhanced Electrochemical Performance of Ni‐Rich Layered Cathode Materials by using LiPF6 as a Cathode Additive

Stable Lithium Sulfur Battery Based on In Situ Electrocatalytically Formed Li2S on Metallic MoS2–Carbon Cloth Support

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Dual functions of zirconium modification on improving the electrochemical performance of Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂

Enhanced Electrochemical Performance of Ni‐Rich Layered Cathode Materials by using LiPF₆ as a Cathode Additive

Stable Lithium Sulfur Battery Based on In Situ Electrocatalytically Formed Li₂S on Metallic MoS₂–Carbon Cloth Support