<br>聚氨酯-P2S5复合材料固态电解质助力低极化高稳定性全固态锂离子电池,RSC Advances

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聚氨酯-P2S5复合材料固态电解质助力低极化高稳定性全固态锂离子电池
RSC Advances ( IF 3.9 ) Pub Date : 2022-09-29 , DOI: 10.1039/d2ra05330f
Peng Cui ₁ , Chun Sun ₁ , Hanqing Dai ₂ , Wei Wei ₁

Affiliation

以聚氨酯（PU）为代表的嵌段共聚物电解质因其优异的机械性能，已成为高性能锂金属电池有机固态电解质的前沿领域。然而，由于机械硬链段的存在，电解质-电极接触处的不连续离子跃迁是不可避免的，从而导致严重的极化现象、循环稳定性差和容量保持率不足等一系列问题。在这里，我们提出了一种通过调节软链段来提高电解质-电极的化学稳定性和相互作用的新策略，成功地减少了极化现象。然后利用高锂离子亲和力的P ₂ S ₅通过离子电导链段改性制备了一种基于嵌段共聚物PU（简称SPE）的新型复合聚合物固体电解质，其离子电导率达到7.4×10 ^-4分别为S cm ^-1 (25 °C) 和4.3 × 10 ^-3 S cm ^-1 (80 °C)。组装后的LFP|SPE|Li表现出高比容量和稳定的充电/放电平台。此外，在5C下循环2000次后，锂对称电池仍具有90%的优异容量保持率，并且锂对称电池在750小时内没有表现出明显的极化。这项工作提供了一种抑制极化现象的可行策略，以开发具有长循环稳定性和高容量保持率的新型嵌段共聚物电解质。

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Polyurethane–P2S5 composite-based solid-state electrolyte assists low polarization and high stability all-solid-state lithium-ion batteries

Block copolymer electrolytes represented by polyurethane (PU) have become the forefront field of organic solid-state electrolytes for high-performance lithium-metal batteries due to their superb mechanical properties. However, due to the existence of mechanical hard segments, discontinuous ion transition at the electrolyte–electrode contact is inevitable, which leads to a series of problems such as terrible polarization phenomena, poor cycle stability and inadequate capacity retention. Here, we propose a new strategy to improve the chemical stability and interaction of electrolyte–electrode by modulating soft segments, which successfully reduces the polarization phenomenon. Then a new composite polymer solid electrolyte based on block copolymer PU (abbr. SPE) was prepared by ion-conduct segment modification using P₂S₅ with high lithium-ion affinity, and the ion conductivity of the SPE reached 7.4 × 10⁻⁴ S cm⁻¹ (25 °C) and 4.3 × 10⁻³ S cm⁻¹ (80 °C) respectively. The assembled LFP|SPE|Li displays a high specific capacity and stable charging/discharging platforms. Besides, an excellent retention capacity of 90% is obtained after 2000 cycles at 5C, and the lithium symmetric battery exhibits no significant polarization over 750 h. This work provides a viable strategy to suppress the polarization phenomenon to develop new block copolymer electrolytes with long cycle stability and high capacity retention.

更新日期：2022-09-29

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