【摘 要】
：
Low initial Coulombic efficiency(ICE)is an important impediment to practical application of Li-rich lay-ered oxides(LLOs),which is due to the irreversible oxygen release.It is generally considered that surface oxygen vacancies are conducive to the improve
【机 构】
：
Guangzhou Key Laboratory of Clean Transportation Energy Chemistry,School of Chemical Engineering and
论文部分内容阅读
Low initial Coulombic efficiency(ICE)is an important impediment to practical application of Li-rich lay-ered oxides(LLOs),which is due to the irreversible oxygen release.It is generally considered that surface oxygen vacancies are conducive to the improvement of ICE of LLOs.To reveal the relation of oxygen vacancies and ICE,sample PLO(Li-Mn-Cr-O)and its treated product(TLO)are comprehensive investi-gated in this work.During the treated process,part of oxygen atoms return to original constructed vacan-cies.It makes oxygen vacancies in sample TLO much poorer than those in sample PLO,and induces the formation of Li-poor spinel-layered integrated structure.Electrochemical measurement indicates the ICE of sample PLO is only 80.8％,while sample TLO is almost full reversible with the ICE of～97.1％.In term of high-energy X-ray diffraction,scanning transmission electron microscopy,X-ray photoelectron spec-troscopy and synchrotron hard/soft X-ray absorption spectroscopy,we discover that the ICE is difficult to be improved significantly just by building oxygen vacancies.LLOs with high ICE not only have to con-struct suitable oxygen vacancies,but also require other components with Li-poor structure to stabilize oxygen.This work provides deep insight into the mechanism of high ICE,and will contribute to the design and development of LLOs for next-generation high-energy lithium-ion batteries.
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