Fluorination Induced the Surface Segregation of High Voltage Spinel on Lithium-Rich Layered Cathodes for Enhanced Rate Capability in Lithium Ion Batteries.

doi:10.1021/acsami.5b10759

Paper

Fluorination Induced the Surface Segregation of High Voltage Spinel on Lithium-Rich Layered Cathodes for Enhanced Rate Capability in Lithium Ion Batteries.

Published Feb 4, 2016 · Yi-Chun Jin, J. Duh

ACS applied materials & interfaces

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Abstract

This study is aimed to explore the effect of fluoride doping and the associated structural transformation on lithium-rich layered cathode materials. The polymeric fluoride source is first adopted for synthesizing lithium intercalated oxide through a newly developed organic precipitation process. A heterostructured spinel/layered composite cathode material is obtained after appreciable fluorination and a superior rate capability is successfully achieved. The fluoride dopant amount and the surface spinel phase are evidenced and systematically examined by various structural spectroscopy and electrochemical analysis. It appears the reversible Ni(2+/4+) redox couple at high voltage regime around 4.8 V because of the formation of spinel LiNi1/2Mn3/2O4 phase. The mechanism of "layer to spinel" phase transformation is discussed in detail.

Study Snapshot

Fluoride doping in lithium-rich layered cathodes leads to surface segregation of high voltage spinel, enhancing rate capability in lithium ion batteries.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Paper

Fluorination Induced the Surface Segregation of High Voltage Spinel on Lithium-Rich Layered Cathodes for Enhanced Rate Capability in Lithium Ion Batteries.

References

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Citations

Facet-Dependent Ni Segregation in a Micron-Sized Single-Crystal Li1.2Ni0.2Mn0.6O2 Cathode.

Ni surface segregation in micron-sized single-crystal Li1.2Ni0.2Mn0.6O2 cathodes depends on the crystal facet, affecting the electrochemical properties and affecting surface reconstructions.

Improving the Cyclic Reversibility of Layered Li-Rich Cathodes by Combining Oxygen Vacancies and Surface Fluorination.

Combining oxygen vacancies and surface fluorination improves the cyclic reversibility of layered Li-rich cathodes for Li-ion batteries, reaching 268 mAh/g and 99% capacity retention after 100 cycles.

Amorphous fluorine glaze for crack-free nickel-rich layered cathode grains under electrochemical cycling

A fluorine glaze effectively prevents grain cracking and surface collapse in nickel-rich layered cathode, resulting in high performance and robust cycling in lithium-ion batteries.

In Situ Surface Self‐Reconstruction Strategies in Li‐Rich Mn‐Based Layered Cathodes for Energy‐Dense Li‐Ion Batteries

In situ surface reconstruction strategies can stabilize lithium-rich manganese-based layered oxides, preventing performance degradation and enhancing battery performance.

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Phase transition in Li- and Mn-rich cathode materials can be improved by constructing spinel surface coatings and spinel/layered hetero-structures, enhancing electrochemical performance in lithium-ion batteries.

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Enhanced electrochemical performances of cerium-doped Li-Rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials

Cerium doping and the formation of layered-spinel hetero-structure in lithium-rich cathode materials significantly improve cycling stability and rate capability, with initial discharge capacity of 265.4 mAhg1 at 0.1 C.