The capacity of B-CNT/TA-GF without Co-removal process is 938 mAh, which is better than B-CNT/TA-GF with Co-removal process, indicating that the Co oparticles further improve the electrochemical performance of our material. B-CNT/TA-GF (after the metal removal) presents good CE, VE, EE, and capacity of 94.6%, 84.9%, 80.3%, and 903 mAh,
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