A high energy density Li-rich positive-electrode material with superior performances via a dual chelating agent co-precipitation route

Hou, Peiyu; Xu, Long; Song, Jinbao; Song, Dawei; Shi, Xixi; Wang, Xiaoqing; Zhang, Lianqi

doi:10.1039/c5ta01184a

Cited by 36 publications

(18 citation statements)

References 37 publications

(54 reference statements)

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“…Fig. 8 shows that the shapes of the CVs and electrochemical reactions of the three samples are in good agreement with previous studies [17,25,36]. In the initial anodic processes of the N-LR-NCM and C-LR-NCM, there are two oxidation peaks at about 4.1 V and 4.6 V. The 4.1 V peak is due to the oxidation process of Ni 2+ /Co 3+ to higher oxidation states.…”

Section: Electrochemical Measurementssupporting

confidence: 88%

“…Among all the modified methods, nano-crystallization is the most widely used strategy to enhance their discharge capacities and rate capabilities owing to short diffusion length and large active surface areas [11,17,18]. However, nano-materials easily cause side reactions with electrolyte and result in poor cycling performance [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and electrochemical performance of micro-sized Li-rich layered cathode material for Lithium-ion batteries

Pan

Xia

Qiu

et al. 2016

Electrochimica Acta

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Synthesis and electrochemical performance of micro-sized Li-rich layered cathode material for Lithium-ion batteries, Electrochimica Acta http://dx.(Z. Liu).2 Highlights 1. Micron Li-rich oxides have been synthesized by a new two-step method.2. Micron particles result in high pellet density and good cycling performance.3. High capacity of the micron Li-rich oxide was achieved after Na 2 S 2 O 8 treatment. 3 ABSTRACTLi-rich layered oxides with micro-sized primary particles usually exhibit higher pellet density and better cycling performance. However, it is often at the expense of high reversible capacity. Here, we reported a simple strategy through a new chemical lithiation with micro-sized spinel-precursors and Na 2 S 2 O 8 surface treatment to obtain micro-sized particles in the Li-rich Li 1.172 Ni 0.135 Co 0.135 Mn 0.539 O 2 oxide without compromising its discharge capacity (260 mAh/g at 0.1 C). Benefited from its larger particles and lower specific surface area, the obtained micron Li-rich layered material manifests its higher pellet density (3.18 g/cm 3 ) and better cycling performance in comparison with the nano-sized Li-rich layered material. After 100 cycles at 0.1 C，it can still deliver a capacity of 192 mAh/g with retention of 74 %, much higher than 167 mAh/g with retention of 67 % of the nano-sized sample. Moreover, the micron Li-rich layered material also exhibits good rate performance with a capacity of 174 mAh/g at 2 C benefited from the 3D Li + insertion/extraction channel of its surface spinel content. These results may provide a new insight on improving pellet density of high-performance Li-rich layered cathode materials.

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Section: Electrochemical Measurementssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Synthesis and electrochemical performance of micro-sized Li-rich layered cathode material for Lithium-ion batteries

Pan

Xia

Qiu

et al. 2016

Electrochimica Acta

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“…Ma et al further discovered that P2‐type Na 0.78 Ni 0.23 Mn 0.69 O 2 exhibited a certain oxygen activity via regulation of the Na/TM ratio . Similar to the basic reports on Li‐excess cathode materials for LIBs, the lattice oxygen atoms take part in the partial compensation mechanism in the high‐voltage region during the first cycle (Figure c), which is responsible for the extra charge capacity . Additionally, the oxygen vacancies and higher sodium content restrain the P2–O2 phase transition upon charging to 4.5 V. Further investigations are required to improve the reversibility of the oxygen‐based redox processes during extended cycling by optimizing and controlling the oxygen activity to acquire a high capacity.…”

Section: Sodium Ion Batteriessupporting

confidence: 56%

Micro/Nanostructured Materials for Sodium Ion Batteries and Capacitors

Zhou

2017

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215

172

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High-efficiency energy storage technologies and devices have received considerable attention due to their ever-increasing demand. Na-related energy storage systems, sodium ion batteries (SIBs) and sodium ion capacitors (SICs), are regarded as promising candidates for large-scale energy storage because of the abundant sources and low cost of sodium. In the last decade, many efforts, including structural and compositional optimization, effective modification of available materials, and design and exploration of new materials, have been made to promote the development of Na-related energy storage systems. In this Review, the latest developments of micro/nanostructured electrode materials for advanced SIBs and SICs, especially the rational design of unique composites with high thermodynamic stabilities and fast kinetics during charge/discharge, are summarized. In addition to the recent achievements, the remaining challenges with respect to fundamental investigations and commercialized applications are discussed in detail. Finally, the prospects of sodium-based energy storage systems are also described.

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“…[17][18][19] Moreover, the regular design and control of dopant elements into NLO is considered to be an effective method to improve structure stability during battery cycle life. [20][21][22][23] Indeed, materials with tightly packed nanograins with optimal crystallite sizes mitigate volume changes by coordinating the expansion/contraction mechanism and mitigate mechanical stress in particles, thereby supporting low pulverization and enhanced battery performances. [24,25] Therefore, working on the structural domain to stabilize the NLO is essential to adjust the overall performance of the LIBs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesium Doping on Voltage Decay of Nickel‐Rich Cathode Materials

et al. 2021

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Structural degradation is the main challenge of Nickel-rich cathodes, leading to capacity and voltage fading, especially at high cut-off voltages. Herein, LiNi 0.94-x Co 0.06 Mg x O 2 (x = 0, 0.01, 0.02) samples have been prepared by high-temperature solidstate reaction method. The effects of Mg doping on its crystalline structure, and electrochemical performance have been studied by various characterizations analysis. We notice that Mg doping can not only tighten the structure/interface stability of the cathode, but also accelerates the Li + diffusion, thereby significantly achieving its high voltage/cycle stability. High-voltage (4.5 V) electrochemical results show that Mgdoped LiNi 0.94 Co 0.06 O 2 (1 % Mg) can achieve a high reversible capacity of 217.5 mAh g À 1 at 0.2 C, high cycle retention rate of 80.5 % after 100 cycles at 0.2 C, inhibits average voltage decay, suppress resistance rise and boosted rate performance. Our work provides a solid strategy for improving the structure and voltage decay of nickel-rich cathode materials for future highenergy lithium-ion batteries.

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A high energy density Li-rich positive-electrode material with superior performances via a dual chelating agent co-precipitation route

Cited by 36 publications

References 37 publications

Synthesis and electrochemical performance of micro-sized Li-rich layered cathode material for Lithium-ion batteries

Synthesis and electrochemical performance of micro-sized Li-rich layered cathode material for Lithium-ion batteries

Micro/Nanostructured Materials for Sodium Ion Batteries and Capacitors

Effect of Magnesium Doping on Voltage Decay of Nickel‐Rich Cathode Materials

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