Novel P2-type concentration-gradient Na0.67Ni0.167Co0.167Mn0.67O2 modified by Mn-rich surface as cathode material for sodium ion batteries

Bao, Shuo; Luo, Shaohua; Wang, Zhiyuan; Yan, Shengxue; Wang, Qing; Li, Jia-Yu

doi:10.1016/j.jpowsour.2018.06.050

Cited by 51 publications

(31 citation statements)

References 31 publications

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“…Recently, Bao presented a concentration‐gradient material (P2‐type Na 0.67 Ni 0.167 Co 0.167 Mn 0.67 O 2 ), which has a specific discharge capacity of 140 mAh g −1 and a capacity retention of ca. 87 % under 100 cycles at 20 mA g −1 . Kaliyappan synthesized Na 0.67 Mn 0.54 Ni 0.13 Co 0.13 O 2 , which exhibited a specific discharge capacity of 123 mAh g −1 at 2–4.5 V at 1 C .…”

Section: Introductionsupporting

confidence: 72%

“…The capacity retention rate is approximately 60 % after 100 cycles (the initial discharge capacity of 198 mAh g −1 ). However, the specific discharge capacity of 120 mAh g −1 under 100 cycles is close to the initial discharge capacity reported by Bao . The capacity attenuation might be because of the overextraction of sodium ion under high pressure that leads to structural changes and irreversible capacity attenuation .…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Erythrocyte‐Like P2‐Type Na_0.67Mn_0.75Co_0.25O₂ for Sodium Storage

et al. 2019

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Sodium-ion batteries are the most promising next-generation energy storage systems. Nevertheless, low capacity and short cycle life have hindered their industrial production. Herein, we synthesized novel erythrocyte-like Na 0.67 Mn 0.75 Co 0.25 O 2 cathode materials through a simple co-precipitation and solid-phase method. The material has an erythrocyte morphology, which is different from the typical angular hexagonal morphology. The Na 0.67 Mn 0.75 Co 0.25 O 2 cathode materials have a preeminent dis-charge capacity of 198 mAh g À 1 at 50 mA g À 1 within a voltage range of 1.5-4.3 V and superior cycling and rate performance. The superior performance of the cathode materials is ascribed to the erythrocyte-like morphology and the layered structure that mitigate the stress and expedite the transfer of sodium ions. The Na 0.67 Mn 0.75 Co 0.25 O 2 cathode materials with erythrocyte-like morphology have great potential for industrial production.[a] X. Co(NO 3 ) 2 · 6H 2 O and MnSO 4 · H 2 O were completely dissolved in 50 ml of deionized water and then precipitated with Na 2 CO 3 deionized water solution (0.8 mol NH 3 · H 2 O was added to prevent hydrolysis).The sediment was filtered, rinsed with deionized water after aging at 60°C for 12 h, and dried at 60°C for 12 h in air to obtain a pink powder. The powder was calcined at 500°C for 2 h in air; after cooling to room temperature, the blackish powder was ground with stoichiometric amounts of Na 2 CO 3 . Finally, we calcined the powder in air at 960°C for 12 h and cooled it naturally to obtain the product. The samples of Na 0.67 Mn 0.65 Co 0.35 O 2 and Na 0.67 Mn 0.85 Co 0.15 O 2 were prepared under the same conditions. 4 5 6 7 8

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Section: Introductionsupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Synthesis of Erythrocyte‐Like P2‐Type Na_0.67Mn_0.75Co_0.25O₂ for Sodium Storage

et al. 2019

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“…Compared with co‐precipitation, sol–gel and solid‐state methods for Co doping, dealloying is more efficient and controllable, where smelted alloys with desired elements are selectively etched into nanostructured materials with tunable compositions and morphologies. [ 23–27 ]…”

Section: Figurementioning

confidence: 99%

Tailoring P2/P3 Biphases of Layered Na_xMnO₂ by Co Substitution for High‐Performance Sodium‐Ion Battery

Jiang

Liu

Wang

et al. 2021

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P‐type layered oxide is a promising cathode candidate for sodium‐ion batteries (SIBs), but faces the challenge of simultaneously realizing high rate capability and long cycle life. Herein, Co‐substituted NaxMnO2 nanosheets with tunable P2/P3 biphase structures are synthesized by a novel dealloying–annealing strategy. The optimized P2/P3–Na0.67Mn0.64Co0.30Al0.06O2 cathode delivers an excellent rate capability of 83 mA h g−1 at a high current density of 1700 mA g−1 (10 C), and an outstanding cycling stability over 500 cycles at 1000 mA g−1. This excellent performance is attributed to the unique P2/P3 biphases with stable crystal structures and fast Na+ diffusion between open prismatic Na sites. Moreover, operando X‐ray diffraction is applied to explore the structural evolution of Na0.67Mn0.64Co0.30Al0.06O2 during the Na+ extraction/insertion processes, and the P2–P2′ phase transition is effectively suppressed. Operando Raman technique is utilized to explore the structural superiority of P2/P3 biphase cathode compared with pure P2 or P3 phase. This work highlights precisely tailoring the phase composition as an effective strategy to design advanced cathode materials for SIBs.

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“…Moreover, the cross‐section SEM image of NMN 25 electrode shows that small and large particles compact accumulation and left few voids (Figure S3). And the Na, Mn and relatively small amounts of Ni were uniformly distributed in the material (Figure d) . The additional EDS mapping was conducted on the large and small particles (P2/P3) and shown in the Figure S4a–d, respectively.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Component Ratio and Particle Size Optimization for High‐Performance and High Tap Density P2/P3 Composite Cathode of Sodium‐Ion Batteries

et al. 2019

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The composite structure materials in sodium-ion batteries (SIBs) have received increasing attentions due to the synergistic effect. P2/P3 composite cathode with the advantages of high reversible capacity and superior reaction kinetics was regarded as one of the promising cathodes for SIBs. Crystal phase component ratio and particle morphology of hybrid structures are closely related with the electrochemical performance, especially the energy density. Herein, P2/P3 hybrid structure materials Na 0.6 Mn 1-x Ni x O 2 were synthesized by co-precipitation method. Furthermore, the component ratio and particle size are tuned and realized via simple Ni 2 + content optimization. The targeted sample Na 0.6 Mn 0.75 Ni 0.25 O 2 shows high tap density over 1.2 g cm À 3 and excellent electrical properties with an initial capacity of 101.36 mA h g À 1 at 0.2 C, corresponding to a high volumetric energy density of 512 Wh L À 1 based on the cathode active material. Moreover, the long-term cycling capacity retention can reach 68 % at 1 C after 500 cycles. The present study develops a promising cathode of SIBs that maybe applied in low-speed electric vehicles. And the simultaneous optimization design represents a potential route for the regulation of composite structures to obtain high performance SIBs.

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Novel P2-type concentration-gradient Na0.67Ni0.167Co0.167Mn0.67O2 modified by Mn-rich surface as cathode material for sodium ion batteries

Cited by 51 publications

References 31 publications

Synthesis of Erythrocyte‐Like P2‐Type Na_0.67Mn_0.75Co_0.25O₂ for Sodium Storage

Synthesis of Erythrocyte‐Like P2‐Type Na_0.67Mn_0.75Co_0.25O₂ for Sodium Storage

Tailoring P2/P3 Biphases of Layered Na_xMnO₂ by Co Substitution for High‐Performance Sodium‐Ion Battery

Simultaneous Component Ratio and Particle Size Optimization for High‐Performance and High Tap Density P2/P3 Composite Cathode of Sodium‐Ion Batteries

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Novel P2-type concentration-gradient Na0.67Ni0.167Co0.167Mn0.67O2 modified by Mn-rich surface as cathode material for sodium ion batteries

Cited by 51 publications

References 31 publications

Synthesis of Erythrocyte‐Like P2‐Type Na0.67Mn0.75Co0.25O2 for Sodium Storage

Synthesis of Erythrocyte‐Like P2‐Type Na0.67Mn0.75Co0.25O2 for Sodium Storage

Tailoring P2/P3 Biphases of Layered NaxMnO2 by Co Substitution for High‐Performance Sodium‐Ion Battery

Simultaneous Component Ratio and Particle Size Optimization for High‐Performance and High Tap Density P2/P3 Composite Cathode of Sodium‐Ion Batteries

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Synthesis of Erythrocyte‐Like P2‐Type Na_0.67Mn_0.75Co_0.25O₂ for Sodium Storage

Synthesis of Erythrocyte‐Like P2‐Type Na_0.67Mn_0.75Co_0.25O₂ for Sodium Storage

Tailoring P2/P3 Biphases of Layered Na_xMnO₂ by Co Substitution for High‐Performance Sodium‐Ion Battery