Refractory materials such as mullite, andalusite, forsterite, and cordierite are generally used to prepare saggers for the calcination of Li‐ion battery Li(Ni_xCo_yMn_z)O₂ (LNCM) cathode material. However, these compounds are prone to be attacked by the LNCM materials, thereby leading to short life spans and contamination of the Li‐ion battery cathode materials. To improve the corrosion resistance of refractory sagger materials, the most clear cut‐way is enhancing the corrosion resistance of matrix using a new refractory component. Potassium aluminate (K₂O·11Al₂O₃, KA₁₁) with an excellent corrosion resistance against alkaline oxide was synthesized via solid‐state method using potassium carbonate (K₂CO₃) and industrial alumina powder (Al₂O₃). Interactions between KA₁₁ and LNCM cathode materials at 800°C–1100°C were characterized by refractory‐LNCM precursor laboratory‐scale tests to understand the corrosion behavior of KA₁₁. The microstructure and phase composition of synthesized KA₁₁ and the calcined KA₁₁‐LNCM mixture cylinders were analyzed with SEM and XRD. The observations reveal that KA₁₁ shows a better corrosion resistance to LNCM materials compared with mullite, cordierite, and forsterite. The addition of synthesized KA₁₁ also favors the thermal shock resistances of mullite‐based sagger materials.

中文翻译：

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合成的K2O·11Al2O3作为裂变基体，用于高温制备锂离子电池正极材料

莫来石，红柱石，镁橄榄石和堇青石等难熔材料通常用于制备用于煅烧锂离子电池Li（Ni _x Co _y Mn _z）O ₂（LNCM）阴极材料的晶格。但是，这些化合物很容易受到LNCM材料的攻击，从而导致使用寿命短和锂离子电池正极材料的污染。为了提高耐火匕首材料的耐腐蚀性，最明确的方法是使用新的耐火成分来增强基体的耐腐蚀性。铝酸钾（K ₂ O·11Al ₂ O ₃，KA ₁₁）使用碳酸钾（K ₂ CO ₃）和工业氧化铝粉末（Al ₂ O ₃）通过固态方法合成了具有优异的耐碱性氧化物腐蚀性能的合金。通过耐火材料-LNCM前体实验室规模测试来表征KA ₁₁和LNCM阴极材料在800°C–1100°C之间的相互作用，以了解KA ₁₁的腐蚀行为。用SEM和XRD分析了合成的KA ₁₁和煅烧后的KA ₁₁ -LNCM混合气瓶的微观结构和相组成。观察结果表明，KA ₁₁与莫来石，堇青石和镁橄榄石相比，对LNCM材料具有更好的耐腐蚀性。合成的KA _11的添加还有利于基于莫来石的sagger材料的抗热震性。