Correlating structural changes of the improved cyclability upon Nd-substitution in LiNi0.5Co0.2Mn0.3O2 cathode materials

Mao, Yan; Guo, Lingjun; Cao, Bokai; Wang, Yiguang; Liao, Zaiyi; Jia, Xiaoxu; Chen, Yong

doi:10.1016/j.ensm.2018.09.003

Cited by 93 publications

(55 citation statements)

References 35 publications

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“…Therefore, the as-prepared powders possess well-layered structures. [29] No extra diffraction peaks are noted, suggesting the occurrence of no phase transitions during element doping. [19] For Sn-NCM622, minor additional impurity peaks appear at 18.2 and 42.3 positions.…”

Section: Resultsmentioning

confidence: 99%

Effects of Various Elements Doping on LiNi_0.6Co_0.2Mn_0.2O₂ Layered Materials for Lithium‐Ion Batteries

Mao

Chen

et al. 2021

Energy Tech

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As lithium-ion batteries (LIBs) have dominated the markets of communication and small devices, and marched into emerging fields such as electric vehicle, urgent requirements in the energy density have promoted ongoing search for cathode materials with high cycle and capability constancy. [1][2][3] Layered oxides LiNi x Co y Mn 1-x-y O 2 (NCM; 0 ≤ x, y, x þ y ≤ 1) of transition metals (TMs) with dense lattice overall possess high specific capacity per unit volume storage, especially for high nickel oxides (with 0.6 ≤ x þ y ≤ 1) that can deliver capacity up to 200 mAh g À1 . [4][5][6] However, these cathode materials still suffer from some drawbacks that limit the energy content of LIBs. For example, the increase in nickel content deteriorates the cycle stability despite improvement in the reversible specific capacity of the materials. [7][8][9] Such limiting factor induces the phase transitions and unavoidable Li þ /Ni 2þ mixing, leading to structural deformation and increased activation disorders. These features would seriously compromise the electrochemical properties of the materials. [10][11][12][13] The improvement of electrochemical properties of LiNi x Co y Mn 1-x-y O 2 materials by doping foreign elements has intensively adopted. For instance, Minsang et al. incorporated Cu into LiNi 1/3 Co 1/3 Mn 1/3 O 2 and found that the presence of Cu may reduce the mixing degree of Li þ /Ni 2þ , suppress the structural transformation, and improve the diffusion rate of Li þ . This, in turn, led to enhanced cycle performance and rate performance. [14] Other studies showed that Ti-doped Li(Ni x Mn x Co 1-2x-y Ti y )O 2 not only increased the energy density but also enhanced the structural stability upon cycling because of the elevated Ti-O bond energy. [15] Chen et al. reported that when F À occupied the O sites in Li-rich layered oxides, cycling stability was enhanced by 94.8% in 50 cycles between 2.0 and 4.8 V. [16] Small amounts of Fe-doped LiNi 1/3 Co 1/3 Mn 1/3 O 2 prepared by simple sol-gel method also displayed slight volume change in the material during Li þ diffusion, resulting in excellent structural stability. [17] In addition, other elements such as Al, [18,19] Cr, [20] Zr, [21,22] and Zn [23,24] have been also explored. Although extrinsic ions introduction can influence the performance of the LiNi x Co y Mn 1-x-y O 2 , it is difficult to evaluate and compare their contribution due to the test standard or preparation strategy, which is different from literature to literature. On the contrary, traditional preparation approaches such as solid-state method may induce uneven doping on host materials due to the loose adhesion and uneven distribution of the dopants. [22,[25][26][27] Motivated by the aforementioned research, herein, a series of metal-doped LiNi 0.6-x Co 0.2 Mn 0.2 M x (M ¼ Cr, Cu, Fe, Sn, and Zn) is synthesized and investigated. Their properties are measured and evaluated under the same condition to better understand their doping effects. In addition, in situ coprecipitation is used in this work to ...

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Section: Resultsmentioning

confidence: 99%

Effects of Various Elements Doping on LiNi_0.6Co_0.2Mn_0.2O₂ Layered Materials for Lithium‐Ion Batteries

Mao

Chen

et al. 2021

Energy Tech

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“…The peaks of NCMOH-0.2Al shi to the high degree compared with NCMOH, indicating the successful introduction of Al atoms. [21][22][23] All the spectra of cathode materials (Fig. 2b) are indexed to the a-NaFeO 2 phase with R 3m space group (JCPDS no.…”

Section: Resultsmentioning

confidence: 99%

Al-doping enables high stability of single-crystalline LiNi_0.7Co_0.1Mn_0.2O₂ lithium-ion cathodes at high voltage

Cheng

Bao

et al. 2021

RSC Adv.

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“…The calculated battery volume (Figure 6c) shows that the shrinkage of the PI3-NCM811 (-1.80%) cathode is smaller than the NCM811 (-1.89%) cathode, which suggests that the cleavage of secondary crystals through coated materials is effectively inhibited and the cycle stability of the battery is prolonged. [36,37] Based on the above results and analysis, we propose a physical model (Figure 7) to explain the working mechanism of the PI3-NCM811 electrode with better cycling performance than the NCM811. During the charging process, the NCM811 crystal will expand in volume and cause the cathode particles to crack; the cathode particles after cracking during the discharge process cannot automatically shrink and heal back to their original state, thus impairing the cycle performance; but in the case of PI3-NCM811, the PI/MWCNTs composite coating with excellent mechanical properties has a centripetal pressure directed to the center of the particle sphere, which suppresses the cracking damage caused by the expansion of the crystal volume of the NCM811 during discharge.…”

Section: Resultsmentioning

confidence: 99%

High Cycling Stability of the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode via Surface Modification with Polyimide/Multi‐Walled Carbon Nanotubes Composite Coating

Zha

Ouyang

Yin

et al. 2021

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because the transition metal (Ni, Co, and Mn) ions dissolve from the cathode active materials and the side reactions occur with the electrolyte, resulting in poor cycling performance. [9][10][11][12] Furthermore, the LiNi 0.8 Co 0.10 Mn 0.1 O 2 (NCM811) material shows secondary crystal cracking and volume expansion under a fully charged state, which is enough to cause an expanding crack near the grain boundary inside the particle, so it causes poor cyclic stability. [13] The research shows that the volume expansion and contraction of NCM811 can reach 3.9% during the delithiation/lithiation process, which is enough to cause an expanding crack near the grain boundary inside the particle. [13,14] Continuous new cracks in the material particles expose fresh surfaces and continue to react with the electrolyte, resulting in pulverization of the electrode materials and battery failure. At present, coating methods to solve these problems include single-layer coatings, such as SiO 2 , [15

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Correlating structural changes of the improved cyclability upon Nd-substitution in LiNi0.5Co0.2Mn0.3O2 cathode materials

Cited by 93 publications

References 35 publications

Effects of Various Elements Doping on LiNi_0.6Co_0.2Mn_0.2O₂ Layered Materials for Lithium‐Ion Batteries

Effects of Various Elements Doping on LiNi_0.6Co_0.2Mn_0.2O₂ Layered Materials for Lithium‐Ion Batteries

Al-doping enables high stability of single-crystalline LiNi_0.7Co_0.1Mn_0.2O₂ lithium-ion cathodes at high voltage

High Cycling Stability of the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode via Surface Modification with Polyimide/Multi‐Walled Carbon Nanotubes Composite Coating

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Correlating structural changes of the improved cyclability upon Nd-substitution in LiNi0.5Co0.2Mn0.3O2 cathode materials

Cited by 93 publications

References 35 publications

Effects of Various Elements Doping on LiNi0.6Co0.2Mn0.2O2 Layered Materials for Lithium‐Ion Batteries

Effects of Various Elements Doping on LiNi0.6Co0.2Mn0.2O2 Layered Materials for Lithium‐Ion Batteries

Al-doping enables high stability of single-crystalline LiNi0.7Co0.1Mn0.2O2 lithium-ion cathodes at high voltage

High Cycling Stability of the LiNi0.8Co0.1Mn0.1O2 Cathode via Surface Modification with Polyimide/Multi‐Walled Carbon Nanotubes Composite Coating

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Effects of Various Elements Doping on LiNi_0.6Co_0.2Mn_0.2O₂ Layered Materials for Lithium‐Ion Batteries

Effects of Various Elements Doping on LiNi_0.6Co_0.2Mn_0.2O₂ Layered Materials for Lithium‐Ion Batteries

Al-doping enables high stability of single-crystalline LiNi_0.7Co_0.1Mn_0.2O₂ lithium-ion cathodes at high voltage

High Cycling Stability of the LiNi_0.8Co_0.1Mn_0.1O₂ Cathode via Surface Modification with Polyimide/Multi‐Walled Carbon Nanotubes Composite Coating