Influences of direction and magnitude of Mg2+ doping concentration gradient on the performance of full concentration gradient cathode material

Tao, Jinhui; Mu, Aining; Geng, Shujun; Xiao, Hang; Zhang, Letian; Huang, Qingshan

doi:10.1007/s10008-021-04984-0

Cited by 21 publications

(6 citation statements)

References 80 publications

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“…Elemental doping increases the structural stability of Ni-rich ternary cathodes by introducing microdopants to replace atoms in the lattice. Now, the main research progress is to introduce trace amounts of Mg 2+ , 34 Al 3+ , 35 Ti 4+ , 36 Zr 4+ , 37 Ta 5+ , 38 Mo 6+ , 39 and other cations 40 to replace the position of nickel, cobalt, and manganese, which may effectively lessen the degree of volume change during the phase transition process and maintain the crystal structure stable.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Chang

Yan

et al. 2023

J. Phys. Chem. C

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As one of the most promising cathode materials for lithium-ion batteries, nickel-rich layered oxide LiNi0.83Co0.11Mn0.06O2 (NCM83) has an inherent issue with rapid capacity decay caused by phase change and interface side reactions during the charge/discharge cycling. Herein, an effectively synergistic strategy for improving the structural stability and electrochemical performance of NCM83 cathodes has been proposed, combining surface polymeric coating with bulk doping by the high-temperature solid-phase method. The comprehensive results demonstrate that the niobium (Nb) element can be successfully bulk-doped into the crystal lattice, which could increase the layer spacing, thus stabilizing the crystal structure and minimizing the Li+/Ni2+ mixing in the as-prepared NCM83 cathode. Meanwhile, a small amount of Nb in the form of oxide and a layer of polyaniline (PANI) was coated on the NCM83 cathode’s surface. This not only can prevent electrolyte erosion and inhibit side reactions but also can effectively improve the transport coefficient of Li+ during the charge and discharge process. The optimized NCM83 cathode exhibited outstanding discharge-specific capacity (236.79 mAh g–1 at 0.2 C rate and 215.67 mAh g–1 at 2 C rate), stable cycling performance (capacity retention of 84.4% after 100 cycles at 2 C), and excellent rate performance (150.58 mAh g–1 at 10 C) by taking advantage of the synergistic effects. The synergistic strategy using Nb doping in combination with a surface polymeric coating can enhance the fundamental understanding of the high-nickel layered oxide cathodes for lithium-ion batteries.

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Section: Introductionmentioning

confidence: 99%

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Chang

Yan

et al. 2023

J. Phys. Chem. C

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“…Cationic doping is the introduction of K + [27], Na + [28], Mn 4+ [29], Mg 2+ [30][31][32], Al 3+ [33], Ti 4+ [34][35][36], V 4+ [37,38], Zr 4+ [39], etc. in the substitution structure of Li + or transition metal ions.…”

Section: Cation Dopingmentioning

confidence: 99%

“…Tao et al [30] prepared LiNi0.8-xCo0.1Mn0.1MgxO2 by co-precipitation method, which showed low Li + /Ni 2+ cation mixing at 2.7-4.5 V voltage, high structural stability and cycling stability, and the discharge capacity could reach 163.5 mAh g -1 after 200 cycles at 1 C, and the capacity loss rate did not exceed 20%. Bai et al [31] used nano-silica sand grinding method to prepare Mg 2+ -doped NCA, and found that the polarization of the NCA electrode was slightly reduced, the lithium ion diffusion was enhanced, and the cycle retention rate was improved.…”

Section: Cation Dopingmentioning

confidence: 99%

Research Progress on Doping and Coating of High-Nickel Cathode Materials for Lithium-Ion Batteries

Lv,

Ye,

Zhang

et al. 2023

Preprint

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Cathode materials play a key role in the development and application of lithium-ion batteries, but the unfavorable factors such as structural phase transformation and low conductivity in the cycling process restrict the further improvement of battery performance, so the development and modification of high-performance cathode materials is a current research hotspot. LiNixCoyMn1-x-yO2(x≥0.6), a high-nickel cathode material, has the advantages of high platform potential, high energy density and low cost, and is an ideal material to achieve the goal of 300 Wh kg-1 and above for batteries. However, its poor thermal stability, poor interface stability, safety and life cannot meet the requirements of current power batteries. In this paper, the research status of high-nickel cathode materials is introduced, including bulk doping and surface coating, and the modification method of doping and coating integration is also introduced. Finally, we put forward the prospect of the future development trend of high-nickel cathode materials.

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“…To improve the performance of Ni-rich ternary cathode materials, diverse approaches such as doping heterogeneous ions [20][21][22], surface coating [23][24][25], the construction of a single crystal phase [26][27][28], core/shell microstructure [29,30] and particles with concentrationgradient composition [31][32][33] have been adopted to inhibit the formation of microcracking. Among the preceding approaches, building particles with concentration-gradient composition is one of the most effective ways to improve the cyclability of electroactive materials.…”

Section: Introductionmentioning

confidence: 99%

Outstanding Electrochemical Performance of Ni-Rich Concentration-Gradient Cathode Material LiNi0.9Co0.083Mn0.017O2 for Lithium-Ion Batteries

Guo

Chen

et al. 2023

Molecules

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The full-concentrationgradient LiNi0.9Co0.083Mn0.017O2 (CG-LNCM), consisting of core Ni-rich LiNi0.93Co0.07O2, transition zone LiNi1−x−yCoxMnyO2, and outmost shell LiNi1/3Co1/3Mn1/3O2 was prepared by a facile co-precipitation method and high-temperature calcination. CG-LNCM was then investigated with an X-ray diffractometer, ascanning electron microscope, a transmission electron microscope, and electrochemical measurements. The results demonstrate that CG-LNCM has a lower cation mixing of Li+ and Ni2+ and larger Li+ diffusion coefficients than concentration-constant LiNi0.9Co0.083Mn0.017O2 (CC-LNCM). CG-LNCM presents a higher capacity and a better rate of capability and cyclability than CC-LNCM. CG-LNCM and CC-LNCM show initial discharge capacities of 221.2 and 212.5 mAh g−1 at 0.2C (40 mA g−1) with corresponding residual discharge capacities of 177.3 and 156.1 mAh g−1 after 80 cycles, respectively. Even at high current rates of 2C and 5C, CG-LNCM exhibits high discharge capacities of 165.1 and 149.1 mAh g−1 after 100 cycles, respectively, while the residual discharge capacities of CC-LNCM are as low as 148.8 and 117.9 mAh g−1 at 2C and 5C after 100 cycles, respectively. The significantly improved electrochemical performance of CG-LNCM is attributed to its concentration-gradient microstructure and the composition distribution of concentration-gradient LiNi0.9Co0.083Mn0.017O2. The special concentration-gradient design and the facile synthesis are favorable for massive manufacturing of high-performance Ni-rich ternary cathode materials for lithium-ion batteries.

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Influences of direction and magnitude of Mg2+ doping concentration gradient on the performance of full concentration gradient cathode material

Cited by 21 publications

References 80 publications

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

Research Progress on Doping and Coating of High-Nickel Cathode Materials for Lithium-Ion Batteries

Outstanding Electrochemical Performance of Ni-Rich Concentration-Gradient Cathode Material LiNi0.9Co0.083Mn0.017O2 for Lithium-Ion Batteries

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