14823
Here , a K - O ( 2 ) battery is report that uses K ( + ) ions to capture O ( 2 ) ( - ) to form the thermodynamically stable KO ( 2 ) product .
 Chemical: K - O ( 2 ); Chemical: K ( + ); Chemical: O ( 2 ) ( - ); Chemical: KO ( 2 )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: K - O ( 2 ); Chemical: K ( + ); Chemical: O ( 2 ) ( - ); Chemical: KO ( 2 )