Multi-core-shell-structured LiFePO4@Na3V2(PO4)3@C composite for enhanced low-temperature performance of lithium-ion batteries

• 作者: Xing-Xing Gu Shuang Qiao Xiao-Lei Ren Xing-Yan Liu You-Zhou He Xiao-Teng Liu Tie-Feng Liu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 828-836
• 页数: 9页
• 语种: 英文

摘要

In this work,a multi-core-shell-structured LiFePO4@Na3V2(PO4)3@C (LFP@NVP@C) composite was successfully designed and prepared to address inferior low-temperature performance of LiFePO4 cathode for lithium-ion batteries.Transmission electron microscopy (TEM) confirms the inner NVP and outer carbon layers coexisted on the surface of LFP particle.When evaluated at low-temperature operation,LFP@NVP@C composite exhibits an evidently enhanced electrochemical performance in term of higher capacity and lower polarization,compared with [e-mail] at-10 ℃ with 0.5C,LFP@NVP@C delivers a discharge capacity of ca.96.9 mAh·g-1 and discharge voltage of ca.3.3 V,which is attributed to the beneficial contribution of NVP coating.NASICON-structured NVP with an open framework for readily insertion/desertion of Li+ will effectively reduce the polarization for the electrochemical reactions of the designed LFP@NVP@C composite.