在文献中看到这样一句话不是很明白，“After dissolving the stoichiometric amount of Cr(NO3)3·9H2O in distilled water ,aqueous buffer soultion of ammonium acetate/acetic acid was added until PH 6.5 to prevent the dissolution of LiMn2O4 during the coating process”.就是后面这句话，为什么要把PH调到6.5？除了大家都知道的HF会腐蚀LiMn2O4以外，还有LiMn2O4在哪些条件下可以溶解？希望高手能够释疑答惑，谢谢
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