Improving cycle life and rate capability of artificial graphite anode for lithium-ion batteries by agglomeration

Abstract

For lithium-ion batteries (LIBs), the cycle life and ratecapability are of great importance to make practical use in electric vehicles (EVs). Therefore, it is essential to develop anode materials with excellent cycle life and superior ratecapability. In this work, agglomerated graphite (AG) was prepared by agglomerating small-sized coke particles into big particles and subsequent graphitization. The obtained AG exhibits much-improved cycle life and ratecapability for LIBs in comparison with pristine graphite (PG). Meanwhile, orientation intensity, which is defined as the ratio of (004) peak intensity to (110) peak intensity in graphite anode plates X-ray diffraction pattern (XRD), is proposed to evaluate the cycle performance and ratecapability of graphite for LIBs.