![]() ![]() Monitoring the structural parameters of the materials during cycling shows that Mn substitution substantially reduces the magnitude of expansion/contraction of lattice parameters even when comparable amounts of Li are removed from the structure and more significantly also reduces the anisotropy of the volume changes. During the first cycle all materials deliver a specific charge capacity exceeding 230 mAh g −1, corresponding to a residual Li content of x(Li) ≈ 0.15, and exhibit a structural evolution free of any first-order phase transitions. To ensure a meaningful comparison, the upper cutoff potential was varied as a function of the Mn content in the material to ensure comparable states of delithiation and thereby provide a capacity-normalized comparison of the structural evolution. #Periodic table with electronegativity seriesTo raise considerations about the role of Mn and Co, operando X-ray diffraction has been used to resolve the structure−electrochemistry relationships in a series of Ni-rich NMX (LiNi 1−y Mn y O 2, y = 0.25, 0.17, 0.10, 0.05) cathode materials. While such compositions are targeted assuming the redox activity of nickel will lead to higher capacities, the role of even small amounts of Mn and Co in these systems is of great importance. ![]() Driven by demand for greater energy densities, Ni-rich cathode materials, such as lithium nickel cobalt manganese (NCM) and nickel cobalt aluminum (NCA) oxides, with compositions approaching the lithium nickel oxide (LiNiO 2) end-member have been investigated intensively. ![]()
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12/13/2022 10:16:31 pm
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