Ultrathin surface modification by atomic layer deposition on high voltage cathode LiNi0.5Mn1.5O4 for lithium ion batteries
نویسندگان
چکیده
Atomic layer deposition (ALD) has been employed to modify the surface of high voltage cathode LiNi0.5Mn1.5O4 by coating ultrathin Al2O3 layer on the electrodes. The ultrathin layer of Al2O3 can suppress the undesirable reactions during cycling, while maintaining the electron and ion conductivity of the electrode. The ALD Al2O3 coated LiNi0.5Mn1.5O4 showed remarkable improvement over bare LiNi0.5Mn1.5O4. After 200 cycles, the ALD Al2O3 coated LiNi0.5Mn1.5O4 showed 91% capacity retention when the bare LiNi0.5Mn1.5O4 can only maintain 75% in the same testing condition. In addition, the ALD coated LiNi0.5Mn1.5O4 maintained 63% capacity retention after as long as 900 cycles. At an elevated temperature of 55 oC, the ALD Al2O3 coated LiNi0.5Mn1.5O4 still delivered 116 mAh/g at the 100 th
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