鋰離子二次電池正極材料鋰-鎳-鈷-錳-氧的表面處理

Surface Treatment of Li-Ni-Co-Mn-O Cathode Material for Secondary Lithium Ion Battery

吳欣耕(Sin-Geng Wu)

指導教授 ： 唐宏怡

國立暨南國際大學/科技學院/應用化學系/碩士(2011年)

https://doi.org/10.6837/NCNU.2011.00115

摘要

正極材料Li(Li0.08Ni0.34Co0.08Mn0.5)O2的高壓充放電測試特性尚未完全釐清，結構與電量之間的關係以XRD、ICP-OES、與循環伏安法來探究。從Rietveld refinement 模擬計算結果中證實由不同條件製備的Li(Li0.08Ni0.34Co0.08Mn0.5)O2可以具有C2/m monoclinic或R-3m hexagonal此兩種結構。ICP-OES的結果顯示C2/m結構其Ni與Co離子不易於充放電的過程中析出。循環伏安法圖證實4.6 V主要為不可逆氧化反應，也是造成電量損失的原因。研究中使用三氧化二鋁與Pullulan做表面處理的目的為隔離正極材料與電解液的直接接觸，以期達到杜絕兩者之間的副反應，而可以耐高壓或提升電量。

關鍵字

鋰離子二次電池 ； 表面處理

並列摘要

High voltage charge/discharge characteristics of cathode material Li(Li0.08Ni0.34Co0.08Mn0.5)O2 are not fully understood yet. The correlated properties between structure and capacity are investigated by XRD, ICP-OES, and cyclic voltammetry. Compound structures of Li(Li0.08Ni0.34Co0.08Mn0.5)O2, C2/m monoclinic phase or R-3m hexagonal phase depending on preparation condition, can be identified by Rietveld refinement. The results of ICP-OES show structure stability during charge/discharge process. Oxidation potential above 4.6 V in cyclic voltammetry displays an irreversible behavior which may cause capacity fading. The purpose of surface treatment with Al2O3 and Pullulan is to avoid the direct contact between cathode material and electrolyte. It may eliminate side reactions and improve structure stability in high voltage charge/discharge process.

並列關鍵字

secondary Li ion battery ； surface treatment

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