Effect of niobium doping on the structure and electrochemical performance of LiNi0.5Co0.2Mn0.3O2 cathode materials for lithium ion batteries

Yang, Zu Guang; Xiang, Wei; Wu, Zhenguo; He, Feng; Zhang, Jun; Xiao, Yao; Zhong, Benhe; Guo, Xiaodong

doi:10.1016/j.ceramint.2016.12.048

Cited by 80 publications

(35 citation statements)

References 36 publications

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“…To date, many promising strategies have been proposed to enhance the material stability such as the structural and thermal properties. Representative approaches include the doping, morphological control of the primary particle, the cathode surface modification, and the primary particle coating, which will be discussed below.…”

Section: Strategies To Realize Commercializationmentioning

confidence: 99%

“…A wide range of dopants such as Al, Mg, Ti, Mo, Nb, and Na has been introduced into the nickel-rich cathode materials. [86][87][88][89][90][91][92][93][94][95][96][97][98] The mechanisms about improving the cathode stability from the doping was closely related to (1) the introduction of the electrochemically inactive elements into the host structure, (2) prevention of the undesired phase transition from the layered structure to the rock-salt like structure, and (3) promotion of the lithium ion transport due to increased lithium slab distance by the dopants. [21] Among many dopants, the Al and Mg are considered as the most appealing elements due to their low cost.…”

Section: Dopingmentioning

confidence: 99%

“…Representative approaches include the doping, [86][87][88][89][90][91][92][93][94][95][96][97][98] morphological control of the primary particle, [99][100][101][102][103][104] the cathode surface modification, [105][106][107][108][109][110] and the primary particle coating, [35,37,[111][112][113][114][115][116][117][118][119][120][121][122][123][124][125][126] which will be discussed below.…”

Section: Strategies To Realize Commercializationmentioning

confidence: 99%

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Prospect and Reality of Ni‐Rich Cathode for Commercialization

Kim

Lee

Cha

et al. 2017

Advanced Energy Materials

643

582

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practical candidate for the wide application of the LIBs with respect to the reversible capacity, rate capability, and capital cost. [4][5][6][7] In terms of nickel contents, the nickel-rich cathodes with nickel content above 80% have advantages in gravimetric capacity, allowing high gravimetric energy density, compared with the nickel content less than 80%. Currently, the nickel-rich cathodes with the amount of nickel less than 60% are fully commercialized. However, the nickel-rich cathodes with nickel content of ≥80% still have many difficulties in the commercialization with respect to powder properties and electrode fabrication process.The unstable powder properties originate from residual lithium compounds such as LiOH and Li 2 CO 3 that formed by the spontaneous reduction of sensitive trivalent nickel ions during the synthesis process and storage in air. [8][9][10][11] The Li 2 CO 3 significantly promotes the gas evolution and increase the moisture of the cathode powder, which strongly related to the safety issue. [12][13][14] Furthermore, the LiOH on the cathode increases the powder pH value, causing the gelation of the slurry during the electrode fabrication process. The nickel-rich cathode with nickel content of ≤60% have acceptable amount of residual lithium compounds for the practical use. By contrast, the cathode with amount of nickel of ≥80% should be treated by additional process to reduce the residual lithium compounds ( Table 1). Furthermore, other powder properties, such as powder pH and moisture, should be carefully controlled when nickel contents were exceeded of ≥80%. Thus, for the practical application of these cathode materials, most battery companies have adapted the washing process, in which the cathode power was stirred in purified water for 20-40 min. [15,16] The washing process could greatly reduce the residual lithium compounds and powder pH value. [15] However, the washing process not only increases process time and capital cost but also make the nickel-rich cathode more chemically sensitive than nonwashed cathodes. [16] More seriously, the water washing deteriorates the thermal stability of the nickel-rich cathodes, indicating that the washing process should be substituted by other methods for the battery safety.Another important factor for the commercialization of the nickel-rich cathodes is the electrode density directly related to the energy density. In general, the nickel-rich cathodesThe layered nickel-rich cathode materials are considered as promising cathode materials for lithium-ion batteries (LIBs) due to their high reversible capacity and low cost. However, several significant challenges, such as the unstable powder properties and limited electrode density, hindered the practical application of the nickel-rich cathode materials with the nickel content over 80%. Herein, important stability issues and in-depth understanding of the nickel-rich cathode materials on the basis of the industrial electrode fabrication condition for the commercialization of the nickel-rich cathode m...

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Section: Strategies To Realize Commercializationmentioning

confidence: 99%

Section: Dopingmentioning

confidence: 99%

Section: Strategies To Realize Commercializationmentioning

confidence: 99%

See 1 more Smart Citation

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Kim

Lee

Cha

et al. 2017

Advanced Energy Materials

643

582

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“…[24][25][26][27] To overcome these limitations, surface modification is one of most commonly employed routes, which can suppress side reactions at the electrode/electrolyte interface, thereby improving cycle stability. [28][29][30] Currently, many researches have discussed the coating of oxides, [31] phosphates, [32] carbon, [33] and fluoride. [34] In particular, fluoride is considered to effectively protect the electrode material from HF etching, and lithium fluoride has higher Li ion conductivity in comparison with other fluorides.…”

Section: Introductionmentioning

confidence: 99%

Enhanced High‐Temperature Electrochemical Performance of Layered Nickel‐Rich Cathodes for Lithium‐Ion Batteries after LiF Surface Modification

Huang

Peng

et al. 2019

ChemElectroChem

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Layered nickel (Ni)-rich materials have been widely studied as attractive cathode materials for lithium-ion batteries, owing to their high theoretical specific capacity and low cost; however, most Ni-rich materials have poor cycle performance, especially at high temperatures. This study reports a simple sol-gel method for developing lithium fluoride (LiF)-coated Li-Ni 0.90 Co 0.08 Al 0.02 O 2 (NCA@LiF) by immersing NCA powder in a 1butyl-2,3-dimethylimidazolium tetrafluoroborate (BdmimBF 4 ) solution. The residual Li compound on the surface of NCA can be converted into a uniform LiF coating layer through the in situ hydrolysis of BdmimBF 4 . The Li-conducting LiF coating layer inhibits side reactions (LiPF 6 !PF 5 + LiF, PF 5 + H 2 O!POF 3 + HF, POF 3 + Li 2 O!Li x POF y + LiF, Li 2 O/LiOH + HF!H 2 O + 2LiF) with the electrolyte and protects the electrode from HF corrosion. The NCA@LiF sample shows a high capacity retention rate of 79.9 % after 200 cycles at 1 C and an excellent capacity of 155.7 mAh g À 1 at 10 C at room temperature. Additionally, the capacity retention rate of the NCA@LiF sample at high temperatures exhibited a significant improvement in comparison with the NCA sample, reaching 75.7 % after 100 cycles at 60°C at 1 C. This simple and effective method can be used for improving the electrochemistry stability and high-temperature performance of other Ni-based cathode materials.

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“…To mitigate the cathode reactivity with the electrolyte, there are five approaches for the development of high energy LIBs: (1) the incorporation of electrochemically inactive elements into the cathode structure, [30][31][32][33][34][35][36][37] (2) the introduction of the concentration gradient, (3) the introduction of surface coating layer on the cathode, [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] (4) the morphological changes to the porous structure, and (5) the crystallinity tuning from the polycrystalline to the single crystalline cathode. [57][58][59][60][61][62][63][64][65][66] With respect to the first approach, it could improve the interfacial stability by inhibiting the transition metal reductions.…”

Section: Introductionmentioning

confidence: 99%

Surface and Interfacial Chemistry in the Nickel‐Rich Cathode Materials

Kim

Cha

Lee

et al. 2020

Batteries & Supercaps

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With increasing demands for high energy lithium‐ion batteries, layered nickel‐rich cathode materials have been considered as the most promising candidate due to their high reversible capacity and low cost. Although some of the materials with nickel contents ≦60 % were commercialized, there are tremendous obstacles for further improvement of electrochemical performance, which is strongly related to the unstable cathode surface and interfacial properties. In this regard, a specific review on the interfacial chemistry between the cathode and electrolyte during electrochemical testing is provided. We highlight the underpinning interfacial chemistry and degradation mechanisms of the cathode materials. Finally, light is shed on the recent efforts for enhancing the interfacial stability of the nickel‐rich cathode materials.

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Effect of niobium doping on the structure and electrochemical performance of LiNi0.5Co0.2Mn0.3O2 cathode materials for lithium ion batteries

Cited by 80 publications

References 36 publications

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Prospect and Reality of Ni‐Rich Cathode for Commercialization

Enhanced High‐Temperature Electrochemical Performance of Layered Nickel‐Rich Cathodes for Lithium‐Ion Batteries after LiF Surface Modification

Surface and Interfacial Chemistry in the Nickel‐Rich Cathode Materials

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