Hierarchical Li1.2Ni0.2Mn0.6O2 Nanoplates with Exposed {010} Planes as High‐Performance Cathode Material for Lithium‐Ion Batteries

Lai, Chen; Su, Yuefeng; Chen, Shi; Li, Ning; Bao, Lei; Li, Weikang; Wang, Zhao; Wang, Meng; Wu, Feng

doi:10.1002/adma.201402541

Cited by 238 publications

(185 citation statements)

References 38 publications

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“…Remarkably, unlike the pristine electrode, the discharge capacity of the surface-modified electrode became saturated even after several cycles. These capacity retentions are quite noticeable, as they are better than those of other nano-structured4546, cation-doped474849 and surface-coated20262728293050 Li-rich layered oxide electrodes reported to date. Consistent with the first cycle, the improved capacity retentions over the prolonged cycles are attributed to the suppressed phase transition, as verified by long-term cycling (Supplementary Figs 12 and 13) and differential capacity results (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 86%

A stable lithium-rich surface structure for lithium-rich layered cathode materials

et al. 2016

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Lithium ion batteries are encountering ever-growing demand for further increases in energy density. Li-rich layered oxides are considered a feasible solution to meet this demand because their specific capacities often surpass 200 mAh g−1 due to the additional lithium occupation in the transition metal layers. However, this lithium arrangement, in turn, triggers cation mixing with the transition metals, causing phase transitions during cycling and loss of reversible capacity. Here we report a Li-rich layered surface bearing a consistent framework with the host, in which nickel is regularly arranged between the transition metal layers. This surface structure mitigates unwanted phase transitions, improving the cycling stability. This surface modification enables a reversible capacity of 218.3 mAh g−1 at 1C (250 mA g−1) with improved cycle retention (94.1% after 100 cycles). The present surface design can be applied to various battery electrodes that suffer from structural degradations propagating from the surface.

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Section: Resultsmentioning

confidence: 86%

A stable lithium-rich surface structure for lithium-rich layered cathode materials

et al. 2016

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“…The electrochemical performance of the LLMO materials is strongly dependent on the synthesis technique [13,14]. It is reported that the particle size of LLMO and the stoichiometry of Li and O elements are very sensitive to synthesis processes [15,16].…”

Section: Introductionmentioning

confidence: 99%

High-performance lithium-rich layered oxide materials: Effects of chelating agents on microstructure and electrochemical properties

Chen

et al. 2015

Electrochimica Acta

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“…[5][6] Novel and advanced LIBs with higher energy and power density have been pursued intensively to meet these applications, and become the key to the development of advanced cathode materials. [7][8][9] Since the first commercialization of LiCoO 2 in 1980, 10 the transition metal intercalation oxides have caught the major research interests as LIBs cathodes, 11 one of which is the layered lithium-rich cathode materials (LLR), 12-15 xLi 2 MnO 3 •(1-x)LiMO 2 (M = transition metal). Though these materials still suffer from intrinsic poor rate capability and modest cycle stability, [16][17][18] their competitive high specific capacity (ca.…”

Section: Introductionmentioning

confidence: 99%

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

Kou

Lai

et al. 2015

ACS Appl. Mater. Interfaces

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Layered lithium-rich cathode material, Li1.2Ni0.2-xCo2xMn0.6-xO2 (x = 0-0.05) was successfully synthesized using a sol-gel method, followed by heat treatment. The effects of trace amount of cobalt doping on the structure, morphology, and low-temperature (-20 °C) electrochemical properties of these materials are investigated systematically. X-ray diffraction (XRD) results confirm that the Co has been doped into the Ni/Mn sites in the transition-metal layers without destroying the pristine layered structure. The morphological observations reveal that there are no changes of morphology or particle size after Co doping. The electrochemical performance results indicate that the discharge capacities and operation voltages are drastically lowered along with the decreasing temperature, but their fading rate becomes slower when increasing the Co contents. At -20 °C, the initial discharge capacity of sample with x = 0 could retain only 22.1% (57.3/259.2 mAh g(-1)) of that at 30 °C, while sample with x = 0.05 could maintain 39.4% (111.3/282.2 mAh g(-1)). Activation energy analysis and electrochemical impedance spectroscopy (EIS) results reveal that such an enhancement of low-temperature discharge capacity is originated from the easier interface reduction reaction of Ni(4+) or Co(4+) after doping trace amounts of Co, which decreases the activation energy of the charge transfer process above 3.5 V during discharging.

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Hierarchical Li_1.2Ni_0.2Mn_0.6O₂ Nanoplates with Exposed {010} Planes as High‐Performance Cathode Material for Lithium‐Ion Batteries

Cited by 238 publications

References 38 publications

A stable lithium-rich surface structure for lithium-rich layered cathode materials

A stable lithium-rich surface structure for lithium-rich layered cathode materials

High-performance lithium-rich layered oxide materials: Effects of chelating agents on microstructure and electrochemical properties

Role of Cobalt Content in Improving the Low-Temperature Performance of Layered Lithium-Rich Cathode Materials for Lithium-Ion Batteries

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