pH值對鋰鈷氧正極分散性質和電池性能的影響

Effects of pH on the Dispersion and Cell Performance of LiCoO2 Cathodes

董怡伶(Y. L. Tung) ； 李嘉甄(C. C. Li) ； 李志聰(J. T. Lee)

《材料科學與工程》 38卷1期 (2006/03) Pp. 1-6

https://doi.org/10.6409/JMSE.200603.0001

摘要

The effects of pH of water-based slurry on the dispersion homogeneity and cell performance of lithium cobalt oxide (LiCoO2) cathodes were investigated. According to the corrosion experiments, the pH shows noticeable influences on the stability of aluminum (Al) electrode substrate, i.e. the Al is significantly dissolved at pH＜1 and pH≥11. Moreover, the adhesion between LiCoO2 sheet and Al substrate, the electronic conductivity, and the rate capabilities of LiCoO2 cathode are all reduced as the cast slurry has pH≤7.0 or pH≥11.6. The results of rheology analysis and SEM indicate that the as-prepared aqueous slurries can only be dispersed at pH≥9.3. Thus, to simultaneously obtain a well-dispersed LiCoO2 and a LiCoO2 electrode with better electrochemical property, the most appropriate pH value for water-based LiCoO2 cathode processing was found to be around 9.3.

關鍵字

鋰鈷氧 ； 水系漿料 ； pH ； 二次鋰電池

並列摘要

The effects of pH of water-based slurry on the dispersion homogeneity and cell performance of lithium cobalt oxide (LiCoO2) cathodes were investigated. According to the corrosion experiments, the pH shows noticeable influences on the stability of aluminum (Al) electrode substrate, i.e. the Al is significantly dissolved at pH＜1 and pH≥11. Moreover, the adhesion between LiCoO2 sheet and Al substrate, the electronic conductivity, and the rate capabilities of LiCoO2 cathode are all reduced as the cast slurry has pH≤7.0 or pH≥11.6. The results of rheology analysis and SEM indicate that the as-prepared aqueous slurries can only be dispersed at pH≥9.3. Thus, to simultaneously obtain a well-dispersed LiCoO2 and a LiCoO2 electrode with better electrochemical property, the most appropriate pH value for water-based LiCoO2 cathode processing was found to be around 9.3.

並列關鍵字

lithium-ion battery ； LiCoO2 ； pH ； aqueous slurry