Crack-free single-crystalline Ni-rich layered NCM cathode enable superior cycling performance of lithium-ion batteries

Fan, Xinming; Hu, Guorong; Zhang, Bao; Ou, Xing; Zhang, Jiafeng; Zhao, Wengao; Jia, Haiping; Zou, Lianfeng; Li, Peng; Yang, Yong

doi:10.1016/j.nanoen.2020.104450

Cited by 475 publications

(322 citation statements)

References 54 publications

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“…[60] In addition, as displayed in Figure 9C1, O 1s spectra consist of two peaks, which are assigned to TM-O (≈532 eV) and ROCO 2 Li (≈533 eV) (R means alkyl). [61] It is worth noting that the TM-O peak of 3% LCO is stronger than that of the other electrodes, suggesting the dissolution of a less amount of TM. [62] Furthermore, the weaker peak area of ROCO 2 Li for the 3% LCO electrode shows that the decomposition of the electrolyte and the formation of the CEI could be suppressed, which might be attributed to the enhanced stability against dehydrogenation ( Figure 9C2).…”

Section: (13 Of 17)mentioning

confidence: 92%

Pseudo‐Bonding and Electric‐Field Harmony for Li‐Rich Mn‐Based Oxide Cathode

Chen

Zou

Deng

et al. 2020

Adv Funct Materials

185

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The practical application of Li-rich Mn-based oxide cathode is predominately retarded by the capacity decline and voltage fading, associated with the structure distortion and anionic redox reactions. Here, a linkagefunctionalized modification approach to tackle these challenges via a synchronous lithium oxidation strategy is reported. The doping of Ce in the bulk phase activates the pseudo-bonding effect, effectively stabilizing the lattice oxygen evolution and suppressing the structure distortion. Interestingly, it also induces the formation of spinel phase Li 4 Mn 5 O 12 in the subsurface, which in turn constructs the phase boundaries, thereby arousing the interior self-built-in electric field to prevent the outward migration of bulk oxygen anions and boost the charge transfer. Moreover, the formed coating layer Li 2 CeO 3 with oxygen vacancies accelerates Li + diffusion and mitigates electrolyte cauterization. The corresponding cathode exhibits superior longcycle stability after 300 cycles with only a 0.013% capacity drop and 1.76 mV voltage decay per cycle. This work sheds new light on the development of Li-rich Mn-based oxide cathodes toward high energy density applications.

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Section: (13 Of 17)mentioning

confidence: 92%

Pseudo‐Bonding and Electric‐Field Harmony for Li‐Rich Mn‐Based Oxide Cathode

Chen

Zou

Deng

et al. 2020

Adv Funct Materials

185

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“…Its intrinsic thermodynamic property can be controlled by adjusting transition metal element ratio that the nickel, manganese and cobalt ion (Ni 2+ , Ni 3+ , Mn 4+ , Co 3+ ) are both occupied on the transition metal sites [14][15][16]. As found in previous research, the manganese element can enhance thermo-safety but has no electrochemical activity; the cobalt element can stabilize the layered structure and the nickel element mainly contributes to the specific capacity [17][18][19]. In order to obtain higher energy density, LNCMs with high nickel content, such as NCM 523, NCM 622, NCM 811, were studied [20][21][22].…”

Section: Introductionmentioning

confidence: 88%

High-Rate Layered Cathode of Lithium-Ion Batteries through Regulating Three-Dimensional Agglomerated Structure

Sheng

Deng

et al. 2020

Energies

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LiNixCoyMnzO2 (LNCM)-layered materials are considered the most promising cathode for high-energy lithium ion batteries, but suffer from poor rate capability and short lifecycle. In addition, the LiNi1/3Co1/3Mn1/3O2 (NCM 111) is considered one of the most widely used LNCM cathodes because of its high energy density and good safety. Herein, a kind of NCM 111 with semi-closed structure was designed by controlling the amount of urea, which possesses high rate capability and long lifespan, exhibiting 140.9 mAh·g−1 at 0.85 A·g−1 and 114.3 mAh·g−1 at 1.70 A·g−1, respectively. The semi-closed structure is conducive to the infiltration of electrolytes and fast lithium ion-transfer inside the electrode material, thus improving the rate performance of the battery. Our work may provide an effective strategy for designing layered-cathode materials with high rate capability.

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“…Lithium nickel manganese cobalt oxide (NMC) cathodes have been critical pillars of advanced lithium ion batteries at current state (Chen et al, 2019;Xu et al, 2019;Zhou et al, 2019;Kim et al, 2020;Li et al, 2020;Wang et al, 2020b;Wu et al, 2020;Zhang, 2020;Zheng et al, 2020). The particle's crystallinity and morphology can put significant influences on the energy density, cycling stability, and rate capability of the NMC cathodes in practical applications (Liu et al, 2018;Fan et al, 2020). Most commercially available NMC are polycrystalline secondary particles aggregated by numerous nanosized primary particles, which usually maintain the spherical shape from the precursors.…”

Section: Introductionmentioning

confidence: 99%

“…Although more Li + ions can be extracted from Ni-rich cathodes, the electrostatic repulsion between oxygen slabs increases, too, which leads to a more drastic c/a ratio variation during electrochemical cycling. As a result of the anisotropic lattice volume change, the microcrack propagation is more serious in those Ni-rich NMC cathodes (Liu et al, 2018;Fan et al, 2020). Several strategies, such as concentration gradient structure and grain boundary coating, have been developed to improve the structural stability of the polycrystalline NMC cathode (Kim et al, 2018;Ouyang et al, 2018;Su et al, 2019;Lee et al, 2020;Qu et al, 2020;Zou et al, 2020); nevertheless, the demands for higher volumetric energy density and cycling stability are still unsatisfied.…”

Section: Introductionmentioning

confidence: 99%

“…Single-crystalline particles have a smaller surface area for Li insertion/extraction reactions compared with the porous polycrystalline NMC; therefore, a median size of 1-4 um is critical for the single-crystalline NMC to maintain rate capabilities similar to those achieved by conventional polycrystalline NMC (Kimijima et al, 2016a). To date, several techniques, including solid-state sintering (Huang et al, 2011;Zhu et al, 2012;Lin et al, 2015;Wang et al, 2016;Jiang et al, 2017;Fan et al, 2020;Zhong et al, 2020), rheological reaction (Han et al, 2010), and molten flux growth (Kim, 2012;Kimijima et al, 2016a,b;Jiang et al, 2017), have been used to synthesize single-crystalline NMC cathode; equivalent electrochemical performances have been achieved in terms of capacity and rate capability compared with polycrystalline NMC. Moreover, the cycling stability of single-crystalline NMC outperforms the polycrystalline product.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Manipulation of Single-Crystalline Lithium Nickel Manganese Cobalt Oxide Cathodes: A Review of Growth Mechanism

et al. 2020

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Lithium nickel manganese cobalt oxide (NMC) cathodes are of great importance for the development of lithium ion batteries with high energy density. Currently, most commercially available NMC products are polycrystalline secondary particles, which are aggregated by anisotropic primary particles. Although the polycrystalline NMC particles have demonstrated large gravimetric capacity and good rate capabilities, the volumetric energy density, cycling stability as well as production adaptability are not satisfactory. Well-dispersed single-crystalline NMC is therefore proposed to be an alternative solution for further development of high-energy-density batteries. Various techniques have been explored to synthesize the single-crystalline NMC product, but the fundamental mechanisms behind these techniques are still fragmented and incoherent. In this manuscript, we start a journey from the fundamental crystal growth theory, compare the crystal growth of NMC among different techniques, and disclose the key factors governing the growth of single-crystalline NMC. We expect that the more generalized growth mechanism drawn from invaluable previous works could enhance the rational design and the synthesis of cathode materials with superior energy density.

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Crack-free single-crystalline Ni-rich layered NCM cathode enable superior cycling performance of lithium-ion batteries

Cited by 475 publications

References 54 publications

Pseudo‐Bonding and Electric‐Field Harmony for Li‐Rich Mn‐Based Oxide Cathode

Pseudo‐Bonding and Electric‐Field Harmony for Li‐Rich Mn‐Based Oxide Cathode

High-Rate Layered Cathode of Lithium-Ion Batteries through Regulating Three-Dimensional Agglomerated Structure

Synthesis and Manipulation of Single-Crystalline Lithium Nickel Manganese Cobalt Oxide Cathodes: A Review of Growth Mechanism

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