Atomic Layer Deposited MgO: A Lower Overpotential Coating for Li[Ni0.5Mn0.3Co0.2]O-2 Cathode

作者：Laskar Masihhur R; Jackson David H K; Xu Shenzhen; Hamers Robert J; Morgan Dane; Kuech Thomas F

来源：ACS APPLIED MATERIALS %26 INTERFACES, 2017, 9(12): 11231-11239.

DOI：10.1021/acsami.6b16562

• atomic layer deposition
• MgO
• coatin& NMC
• cathode
• Li-ion battery

An ultrathin MgO coating was synthesized via atomic layer deposition (ALD) to improve the surface properties of the Li[Ni0.5Mn0.3Co0.2]O-2 (NMC) cathode. An in-situ quartz crystal sensor was used to monitor the "self-limiting" surface reactions during ALD process and estimate the density of the deposited film. The electrochemical performance of the MgOcoated NMC cathode was evaluated in a half-cell assembly and compared to other ALD-based coatings, such as A1(2)O(3) and ZrO2. Cyclic voltammetry studies suggested that ALD MgO has a higher Li-diffusion coefficient which resulted in lower overpotential on the NMC cathode surface and improved Li-ion battery rate performance. MgO-Coated NMC also Yielded improved capacity retention over uncoated NMC in a long-range cycling test.

• 出版日期2017-3-29