High Capacity, Surface-Modified Layered Li [ Li ( 1 − x ) ∕ 3Mn ( 2 − x ) ∕ 3Nix ∕ 3Cox ∕ 3 ] O2 Cathodes with Low Irreversible Capacity Loss

Layered Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 and Li[Li 0.1 Mn 0.43 Ni 0.23 Co 0.23 ]O 2 cathodes belonging to the Li[Li (1-x)/ 3Mn (2-x)/3 Ni x/3 Co x/3 ]O 2 solid solution series between Li[Li 1/3 Mn 2/3 ]O 2 and LiCo 1/3 Ni 1/3 Mn 1/3 O 2 have been synthesized and characterized by charge-discharge measurements in lithium cells before and after modifying their surface with Al 2 O 3 . The surface-modified cathodes show significantly lower irreversible capacity loss (ICL) and higher discharge capacity with excellent cyclability compared to the unmodified counterparts. For example, surface modified Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 shows a remarkably high capacity of 285 mAh/g with an ICL of 41 mAh/g and good rate capability. This capacity value is much higher than that achieved with the previously known Li[Li 0.17 Mn 0.58 Ni 0.25 ]O 2 after similar surface modification (<255 mAh/g).

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