文献类型：期刊文献

中文题名：全干法合成锂离子电池用高镍三元单晶颗粒及性能

英文题名：All-dry solid-phase synthesis of single-crystalline Ni-rich ternary cathodes for lithium-ion batteries

作者：秦理[1];余海峰[2];姜昕[1];陈灵[1];程起林[1];江浩[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2024

卷号：67

期号：2

起止页码：650

中文期刊名：Science China Materials

外文期刊名：中国科学（材料科学）（英文版）

收录：CSTPCD;;EI(收录号：20240415442245);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:001150070500004)】；CSCD:【CSCD2023_2024】；PubMed;

基金：This work was supported by the National Natural Science Foundation of China (U22A20429 and 22308103), China Postdoctoral Science Foundation (2023M731083), and the Fundamental Research Funds for the Central Universities.

语种：中文

中文关键词：Ni-rich cathodes;all-dry solid-phase synthesis;structural stability;interface modification;Li-ion batteries

外文关键词：Ni-rich cathodes; all-dry solid-phase synthesis; structural stability; interface modification; Li-ion batteries

摘要：单晶型高镍三元层状氧化物凭借高能量密度、长循环寿命和优异的安全性成为新一代锂离子电池理想的正极材料.目前,单晶型高镍三元正极通过“共沉淀+高温锂化”两步制备,不仅工艺繁琐、原材料选择单一,制备过程还会产生大量废水/气.本文提出了一种新的全干法固相合成策略,实现了单晶型高镍三元正极低成本、无废水绿色制备.在煅烧过程引入锶/钛离子作为烧结助剂,降低烧结温度来缓解锂/氧流失,从而降低锂镍混排并稳定晶格氧.此外,针对固相合成过程锂化动力学缓慢导致表面残碱较高的问题,引入硼化合物与残碱反应,不仅有效提升了界面稳定性,而且形成的离子导体还能够加速锂离子在界面处的迁移.因此,制备的单晶型高镍三元正极在0.1 C电流密度下比容量可达到191.1 mA h g^(-1),以1 C电流密度在软包全电池中循环500次后仍具有90.1%的容量保持率.
Single-crystalline ternary cathodes prepared through all-dry solid-phase synthesis(ADSPS)are perceived as prominent candidates for lithium-ion batteries(LIBs)because they are inexpensive and effluent-free.However,the aggravated lithium/oxygen(Li/O)loss and sluggish lithiation process during sintering result in an unstable layered structure and a large amount of surface residual alkali.Herein,a lithium borate(LBO)-coated and strontium/titanium(Sr/Ti)co-doped single-crystalline nickel(Ni)-rich ternary cathode with a highly ordered layered structure is prepared via ADSPS for the first time.The synergistic effect of Sr/Ti ions considerably promotes grain growth with decreased lithiation temperature,which alleviates the Li/Ni disorder and stabilizes the lattice O.After coating with a layer of LBO,the surface residual alkali has been considerably depleted with favorable Li-ion transfer at the interface.Consequently,the as-obtained cathode delivers a high reversible capacity of 191.1 mA h g^(?1) at 0.1 C in coin-type half cells and superior retention of 90.1%after 500 cycles at 1 C in pouch-type full cells.The unique insight and strategy in this research will promote the application of ADSPS in single-crystalline Ni-rich ternary cathodes for LIBs.