7087
In fact , recent studies evidence that Li - O ( 2 ) cells suffer from irreversible electrolyte decomposition during cycling .
 Chemical: Li - O ( 2 )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Li - O ( 2 ) 
Answer:
 Chemical: Li - O ( 2 )