8725
The resultant microbattery based on self - aligned LiFePO ( 4 ) nanoforests of shell - core - shell structure , with precise arrangement of various auxiliary material layers including a central nanometric metal core as direct electronic pathway to current collector , delivers excellent energy density and stable cycling stability only rivaled by the best Li - ion batteries of conventional configurations , while providing rate performance per foot - print and on - site manufacturability unavailable from the latter .
 Chemical: LiFePO ( 4 ); Chemical: Li
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: LiFePO ( 4 ); Chemical: Li