Realizing Complete Solid-Solution Reaction to Achieve Temperature Independent LiFePO4 for High Rate and Low Temperature Li-lon Batteries

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外文摘要：The lithium iron phosphate battery(LiFePO4 or LFP)does not satisfactorily deliver the necessary high rates and low temperatures due to its low Li+diffusivity,which greatly limits its applications.The solid-solution reac-tion,compared with the traditional two-phase transi-tion,needs less energy,and the lithium ion diffusivity is also higher,which makes breaking the barrier of LFP possible.However,the solid-solution reaction in LFP can only occur at high rates due to the lattice stress caused by the bulk elastic modulus.Herein,pomegranate-like LFP@C nanoclusters with ultrafine LFP@C subunits(8 nm)(PNCsLFP)were synthesized.Using in situ X-ray diffraction,we confirmed that PNCsLFP can achieve complete solid-solution reaction at the relatively low rate of 0.1C which breaks the limitation of low lithium ion diffusivity of the traditional LFP and frees the lithium ion diffusivity from tempera-ture constraints,leading to almost the same lithium ion diffusivities at room temperature,0,-20,and-40 ℃.The complete solid-solution reaction at all rates breaks the shackles of limited lithium ion diffusivity on LFP and offers a promising solution for next-generation lithium ion batteries with high rate and low temperature applications.

外文关键词：

complete solid-solution reactionultrafine nanostructurehigh ratelow temperaturelithium-ion batteries

作者：

Bingqiu Liu、Qi Zhang、Yiqian Li、Yuehan Hao、Usman Ali、Lu Li、Lingyu Zhang、Chungang Wang、Zhongmin Su

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作者单位：

Northeast Normal University,Changchun,130024 Jilin

基金：

国家自然科学基金国家自然科学基金中央高校基本科研业务费专项中央高校基本科研业务费专项Jilin Provincial Research Foundation for Basic ResearchJilin Provincial Research Foundation for Basic Research

项目编号：

21771035218720242412018ZD0092412019FZ00920200201071JC20190303100SF

出版年：

2023

DOI：

10.31635/ccschem.022.202201776

中国化学会会刊(英文)

CSCD

ISSN：

年,卷(期)：2023.5(1)

参考文献量34