{HEAD ~ The core portion} of the active material is made of a spinel manganese containing material substituted with fluorine or sulfur, having {TAIL ~ 4V grade potential} and showing low cost and high output characteristics, and the shell portion, which comes into contact with an electrolyte, is made of a spinel transition metal containing material, having excellent thermal stability and cycle life characteristics and showing low reactivity with the electrolyte 
{ HEAD ~ The core portion } of the active material is made of a spinel manganese containing material substituted with fluorine or sulfur , having { TAIL ~ 4V grade potential } and showing low cost and high output characteristics , and the shell portion , which comes into contact with an electrolyte , is made of a spinel transition metal containing material , having excellent thermal stability and cycle life characteristics and showing low reactivity with the electrolyte
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