磷酸钛铝锂基全固态金属锂电池界面稳定性研究
收稿日期: 2023-06-25
网络出版日期: 2024-04-18
基金资助
河南省教育厅高等学校重点科研项目(21B460012)
Investigation of interfacial stability of Li1.3Al0.3Ti1.7（PO4）3 based all-solid-state lithium battery
Received date: 2023-06-25
Online published: 2024-04-18
采用固体电解质代替具有可燃性的液态电解液可有效解决当今锂离子电池的安全问题。然而，固态电池中的电极/电解质的固-固接触通常具有较大的界面阻抗，从而导致电池极化增加。采用聚偏氟乙烯（PVDF）基固体电解质作为正负极界面缓冲层，可有效地解决固体电解质与电极的高界面阻抗问题，使正极界面单位面积阻抗从1 716 Ω/cm2降至213 Ω/cm2。在负极处，PVDF可提供良好的弹性支撑，使负极界面单位面积阻抗从1 135 Ω/cm2降至109 Ω/cm2。此外，金属锂对称电池的直流极化测试表明，经过PVDF修饰后负极界面稳定性显著提高。最后，组装的钴酸锂/金属锂软包电池，正负极界面均经PVDF修饰后，电池能量密度可达到336 W∙h/kg。1C条件下循环300次后，容量保持率可从30.7%提升至83.3%。
王好芳 . 磷酸钛铝锂基全固态金属锂电池界面稳定性研究[J]. 无机盐工业, 2024 , 56(4) : 72 -77 . DOI: 10.19964/j.issn.1006-4990.2023-0337
The application of solid electrolyte instead of flammable liquid electrolyte can effectively solve the safety issues of lithium-ion batteries nowadays.However，the solid-solid contact of electrodes/electrolytes in solid state batteries usually lead to large interfacial impedance，resulting in high polarization.The polyvinylidene difluoride（PVDF） based solid electrolyte was used as cathode and anode interface buffer layer，which effectively solved the problem of high impedance of titanium-aluminum-lithium phosphate solid electrolyte with electrode，reducing the positive interface impedance from 1 716 Ω/cm2 to 213 Ω/cm2.At the anode interface，PVDF provided a good elastic support，so that the interfacial impedance was reduced from 1 135 Ω/cm2 to 109 Ω/cm2.In addition，the direct current polarization of lithium symmetric battery showed that the stability of the anode interface was significantly improved after PVDF modification.Finally，the lithium cobalt oxide/lithium pouch battery was assembled.With PVDF modification on both cathode and anode interface，the energy density of the battery reached to 336 W·h/kg.The capacity retention rate was increased from 30.7% to 83.3% after 300 cycles at 1C.
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