基于LiFePO_4的高容量固态锂离子电池的设计
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摘要
通过在磷酸铁锂(LFP)正极浆料里加入基于PEO的固态电解质浆料,使得固态电解质浆料在正极片里均匀分布,减小锂离子传输距离,改善界面阻抗,从而提升固态电池的容量与安全性能。结果表明当LFP/导电炭黑/PVDF质量比为4.5/0.25/0.25时,扣式固态电池容量可达162.1mAh/g,60℃条件下循环50次后仍有96.2%的容量保持率。
The solid electrolyte slurry could uniformly distribute in the positive electrode sheet by adding PEO-based solid electrolyte slurry into LiFePO_4 positive electrode slurry,which could significantly reduce the transportation distance of lithium ion and modify interface impedance,resulting the improvement of the capacity and security performance of solid-state battery.When the mass ratio of LFP/conductive carbon black/PVDF was 4.5/0.25/0.25,the capacity of the buttontype solid battery could reach 162.1 mAh/g,and the capacity retention ratio could still achieve96.2%after 50 cycles at 60℃.
The solid electrolyte slurry could uniformly distribute in the positive electrode sheet by adding PEO-based solid electrolyte slurry into LiFePO_4 positive electrode slurry,which could significantly reduce the transportation distance of lithium ion and modify interface impedance,resulting the improvement of the capacity and security performance of solid-state battery.When the mass ratio of LFP/conductive carbon black/PVDF was 4.5/0.25/0.25,the capacity of the buttontype solid battery could reach 162.1 mAh/g,and the capacity retention ratio could still achieve96.2%after 50 cycles at 60℃.
引文
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[7]郑碧珠,王红春,马嘉林,龚正良,杨勇.固态电池无机固态电解质/电极界面的研究进展[J].中国科学:化学,2017,47(05):579-593.
[2]张永龙,夏会玲,林久,陈少杰,许晓雄.浅析固态锂离子电池安全性[J].储能科学与技术,2018,7(06):994-1002.
[3] KASEMCHAINAN J,BRUCE P G.All-Solid-State Batteries and their Remaining Challenges[J].Johnson Matthey Technology Review.2018,62(2):177-180.
[4]李杨,丁飞,桑林,钟海,刘兴江.全固态锂离子电池关键材料研究进展[J].储能科学与技术,2016,5(05):615-626.
[5] WU B B,LOCHALA J,TAVERNEB T,et al.The interplay between solid electrolyte interface(SEI)and dendritic lithium growth[J].Nano Energy.2017,40:34-41.
[6]全方位解析全固态锂离子电池[J].电子元器件与信息技术,2018,2(04):41-44.
[7]郑碧珠,王红春,马嘉林,龚正良,杨勇.固态电池无机固态电解质/电极界面的研究进展[J].中国科学:化学,2017,47(05):579-593.