Crystal Habit‐Tuned Nanoplate Material of Li[Li1/3–2x/3NixMn2/3–x/3]O2 for High‐Rate Performance Lithium‐Ion Batteries

Wei, Guojun; Lu, Xia; Ke, Fu‐Sheng; Huang, Ling; Li, Jun‐Tao; Wang, Zhao‐Xiang; Zhou, Zhi‐You; Sun, Shi‐Gang

doi:10.1002/adma.201001578

Cited by 368 publications

(232 citation statements)

References 33 publications

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“…This outstanding rate capability is also observed in the previously excellent reports, 10,40,41 which have similar nano-plates morphology with our research. However, the L4 and L5 electrodes show poorer rate capability than other samples.…”

Section: Articlesupporting

confidence: 92%

Effective enhancement of the electrochemical performance of layered cathode Li_1.5Mn_0.75Ni_0.25O_2.5via a novel facile molten salt method

et al. 2015

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. (2015). Effective enhancement of the electrochemical performance of layered cathode Li 1.5 Mn 0.75 Ni 0.25 O 2.5 via a novel facile molten salt method. RSC Advances: an international journal to further the chemical sciences, 5 (72), 58528-58535. Effective enhancement of the electrochemical performance of layered cathode Li1.5Mn0.75Ni0.25O2.5 via a novel facile molten salt method AbstractA series of nanocrystalline lithium-rich cathode materials Li 1.5 Mn 0.75 Ni 0.25 O 2.5 have been prepared by a novel synthetic process, which combines the co-precipitation method and a modified molten salt method. By using a moderate excess of 0.5LiNO 3 -0.5LiOH eutectic salts as molten media and reactants, the usage of deionized water or alcohol in the subsequent wash process is successfully reduced, compared with the traditional molten salt method. The materials with different excess Li salt content, Li/M (M = Ni + Mn) = 1.55, 1.65, 1.75, 1.85, 1.95, 2.05, molar ratio, show distinct differences in their structure and charge-discharge characteristics. The structural characterization demonstrates that the sample with a ratio of Li/M = 1.85 has a more well-defined alpha-NaFeO 2 structure and a more enlarged Li layer spacing. It also exhibits the best comprehensive electrochemical behavior with the highest coulombic efficiency, the best rate capability and optimal cycling stability. More specifically, it delivers a dramatically improved initial coulombic efficiency of 87.86%, and a discharge capacity of 129 mA h g -1 even at an ultra-high current density of 2000 mA g -1 (10C). Meanwhile a superior cycling stability is also observed with a high discharge capacity of 251 mA h g -1 and a retention of 98% at 0.2C after 50 cycles. Our results reveal that this method is facile and feasible to synthesize a high rate and high capacity lithium-rich material. have been prepared by a novel synthetic process, which is combined with the co-precipitation method and the modified molten salt method. By using the moderate excessive 0.5LiNO 3 -0.5LiOH eutectic as molten media and reactants, the usage of the deionized water or alcohol in the subsequent wash process is successfully reduced, compared with the traditional molten salt method. The materials with different excessive Li salts content, Li/M (M = Ni + Mn) = 1.55, 1.65, 1.75, 1.85, 1.95, 2.05, molar ratio, show distinct differences in structure and charge/discharge characteristics. The structural characterization demonstrates that the sample with the ratio of Li/M = 1.85 has more well-defined α-NaFeO 2 structure and more enlarged Li layer spacing. And it exhibits the best comprehensive electrochemical behaviors with the highest coulombic efficiency, best rate capability and optimal cycling stability. More specifically, it delivers a dramatically improved initial coulombic efficiency of 87.86%, and a discharge capacity of 129 mAh g -1 even at an ultra-high current density of 2000 mA g -1 (10 C), meanwhile the superior cycling stability is also observed with a high discharge capacity of 2...

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Section: Articlesupporting

confidence: 92%

Effective enhancement of the electrochemical performance of layered cathode Li_1.5Mn_0.75Ni_0.25O_2.5via a novel facile molten salt method

et al. 2015

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“…[77] SnO 2 nanoribbons with (101 ) and (010) exposed have been demonstrated by Yang et al to be highly effective NO 2 sensors even at room temperature. [78] Most recently, a cathode for high-rate-performance lithium-ion batteries (LIBs) has been developed from a crystal-habittuned Li (Li 0.17 Ni 0.25 Mn 0.58 )O 2 nanoplate material by Sun et al [79] in which the proportion of (010) nanoplates has been significantly increased. The results demonstrate that the fraction of the surface that is electrochemically active for Li + transportation is a key criterion for evaluating the different nanostructures of potential LIB materials.…”

Section: Discussionmentioning

confidence: 99%

Catalysis Based on Nanocrystals with Well‐Defined Facets

2011

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Using bottom-up chemistry techniques, the composition, size, and shape in particular can now be controlled uniformly for each and every nanocrystal (NC). Research into shape-controlled NCs have shown that the catalytic properties of a material are sensitive not only to the size but also to the shape of the NCs as a consequence of well-defined facets. These findings are of great importance for modern heterogeneous catalysis research. First, a rational synthesis of catalysts might be achieved, since desired activity and selectivity would be acquired by simply tuning the shape, that is, the exposed crystal facets, of a NC catalyst. Second, shape-controlled NCs are relatively simple systems, in contrast to traditional complex solids, suggesting that they may serve as novel model catalysts to bridge the gap between model surfaces and real catalysts.

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“…For example, Sun et al prepared Li[Li 1/3-2x/3 Ni x Mn 2/3-x/3 ]O 2 nanoplates using the hydrothermal method. The so-called crystal habit-tuned material has a large exposed (0 10) plane which ensures fast Li + intercalation/deintercalation [5]. In addition, doping with cations or anions such as Al 3+ , Cr 3+ , Mg 2+ , F À , and PO 4 3À has also been studied recently [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Performance and Thermal Stability of Li-excess Li1.18Co0.15Ni0.15Mn0.52O2 Cathode Material by Li3PO4 Surface Coating

Bian

Bie

et al. 2015

Electrochimica Acta

112

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Crystal Habit‐Tuned Nanoplate Material of Li[Li_1/3–2x/3Ni_xMn_2/3–x/3]O₂ for High‐Rate Performance Lithium‐Ion Batteries

Cited by 368 publications

References 33 publications

Effective enhancement of the electrochemical performance of layered cathode Li_1.5Mn_0.75Ni_0.25O_2.5via a novel facile molten salt method

Effective enhancement of the electrochemical performance of layered cathode Li_1.5Mn_0.75Ni_0.25O_2.5via a novel facile molten salt method

Catalysis Based on Nanocrystals with Well‐Defined Facets

Improved Electrochemical Performance and Thermal Stability of Li-excess Li1.18Co0.15Ni0.15Mn0.52O2 Cathode Material by Li3PO4 Surface Coating

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Crystal Habit‐Tuned Nanoplate Material of Li[Li1/3–2x/3NixMn2/3–x/3]O2 for High‐Rate Performance Lithium‐Ion Batteries

Cited by 368 publications

References 33 publications

Effective enhancement of the electrochemical performance of layered cathode Li1.5Mn0.75Ni0.25O2.5via a novel facile molten salt method

Effective enhancement of the electrochemical performance of layered cathode Li1.5Mn0.75Ni0.25O2.5via a novel facile molten salt method

Catalysis Based on Nanocrystals with Well‐Defined Facets

Improved Electrochemical Performance and Thermal Stability of Li-excess Li1.18Co0.15Ni0.15Mn0.52O2 Cathode Material by Li3PO4 Surface Coating

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Crystal Habit‐Tuned Nanoplate Material of Li[Li_1/3–2x/3Ni_xMn_2/3–x/3]O₂ for High‐Rate Performance Lithium‐Ion Batteries

Effective enhancement of the electrochemical performance of layered cathode Li_1.5Mn_0.75Ni_0.25O_2.5via a novel facile molten salt method

Effective enhancement of the electrochemical performance of layered cathode Li_1.5Mn_0.75Ni_0.25O_2.5via a novel facile molten salt method