15758
It is believed that further carbon coating is a facile and effective way to improve the electrochemical performance of LiFePO ( 4 ) - PC .
 carbon, LiFePO ( 4 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 carbon, LiFePO ( 4 )