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『锂电』南京邮电大学 Angew:共晶调控溶剂化结构,构筑高电导共晶基聚合物电解质

  • 2026-06-05 00:01:24
『锂电』南京邮电大学 Angew:共晶调控溶剂化结构,构筑高电导共晶基聚合物电解质
【背景挑战】
固态聚合物电解质兼具柔性与界面兼容性优势,但室温电导低、电化学窗口窄、界面相容性差三大瓶颈难以突破:1)传统 PEO 基电解质室温电导仅 10⁻⁶~10⁻⁵ S cm⁻¹,无法满足快充需求;2)高压稳定性差(<3.9 V),难以适配 NCM811 等高电压正极;3)极性基团易形成溶剂化陷阱捕获 Li⁺,离子传输受阻,界面副反应严重;4)增塑剂提升电导但大幅降低力学强度,存在固有权衡。在保持力学强度的同时,解除溶剂化陷阱、构建连续离子通路、拓宽高压窗口,是实用化固态聚合物电解质的核心难题。
【文献导入】
本研究提出离子液体调控共晶基聚合物电解质(I-EPE)策略:将丁二腈基共晶电解质引入聚二丙酮丙烯酰胺(PDA)基体,构筑连续离子传输网络;离子液体(IL)优先与 PDA 作用,形成界面溶剂化层,通过配位竞争释放 Li⁺,避免极性基团捕获;双盐体系(LiTFSI+LiDFOB+FEC 协同构建富无机稳定 SEI,抑制锂负极副反应;实现 30 ℃离子电导率2.3 mS cm⁻¹,电化学窗口5.1 V,力学与电导同步突破。Li||Li 对称电池 0.1 mA cm⁻² 稳定循环1000 hLi||NCM811 电池 1 C 循环 500 圈保持70.8%容量。
【创新点】
策略原创:首次提出配位竞争解除溶剂化陷阱,打破聚合物电解质电导力学固有矛盾;
机制突破:揭示IL 调控溶剂化富阴离子环境快速 Li⁺释放高效传输新机制;
性能突破:室温电导 2.3 mS cm⁻¹+5.1 V 超宽窗口 + 1000 h 稳定锂对称电池;
实用突破:原位紫外聚合工艺,软包电池弯折、切割、按压均安全工作。
【图文详解】
 1 共晶基聚合物电解质设计与基础性能
 1 共晶聚合物电解质的基本性质。(a) 聚合前后 FT-IR(b) SNI-EPE0.15  F-EPE0.15  XRD(c) 不同电解质 DSC(d) 30 ℃离子电导率;(e) I-EPE0.15  F-EPE0.15 电化学窗口;(f) 电化学窗口与离子电导率文献对比;(g) DFT 计算各组分 HOMO/LUMO(h) 高压浮置测试;(i) Li⁺迁移数;(j) Arrhenius 曲线;(k) LSV 曲线。
1IL 显著抑制 SN 结晶,电解质呈无定形结构,利于离子传输;
2I-EPE0.15 实现电导与力学最优平衡,30 ℃电导达 2.3 mS cm⁻¹
3)氧化稳定性高达5.1 V4.8 V 高压浮置稳定无明显分解。
 2 溶剂化结构与离子传输机制
 2 共晶聚合物电解质的溶剂化结构与离子传输机制。(a) 不同组分与 Li⁺结合能;(b) 不同组分与 PDA 结合能;(c) 不同组分与 SN 结合能;(d,e) I-EPE0.15F-EPE0.15  RDF 与配位数;(f,g) I-EPE0.15F-EPE0.15  MD 模拟。
1IL  Li⁺结合能最高(-3.01 eV),优先参与 Li⁺溶剂化鞘层;
2IL 抑制 PDA 羰基对 Li⁺的螯合捕获,释放更多自由 Li⁺
3I-EPE0.15  Li⁺ SNTFSI⁻配位更稳定,传输势垒更低。
 3 锂对称电池电化学与负极界面 XPS
 3 锂对称电池电化学性能与循环后负极 XPS(a–d) 不同组分锂对称电池电压曲线;(e) C 1s(f) F 1s(g) N 1s XPS 谱。
1I-EPE0.15 对称电池0.1 mA cm⁻² 稳定 1000 h,过电位仅 26 mV
2SEI 富含 LiFLi₃N 与咪唑鎓组分,界面更稳定;
3IL 参与 SEI 形成,显著降低副反应与界面阻抗。
 4 界面形貌与安全特性
 4 电解质界面性质与安全特性。(a–d) 循环后锂负极 SEM(e) Li/I-EPE/NCM811 电池 CEI(f,g) F-EPE  I-EPE 阻燃对比。
1I-EPE0.15 体系锂沉积致密无枝晶,对照体系枝晶明显;
2CEI 厚度均匀(~17 nm),界面接触稳定;
3I-EPE0.15自熄阻燃,F-EPE 持续燃烧,安全优势突出。
 5 固态锂金属电池电化学性能
 5 30 下固态锂金属电池电化学性能。(a) I-EPE0.15  F-EPE0.15 匹配 NCM811 长循环;(b) 不同圈数充放电曲线;(c) 倍率性能;(d) 不同 PDA 含量长循环;(e) 不同 PDA 含量倍率;(f) 高载量 NCM811 循环;(g) 软包电池循环;(h) 室温性能文献对比;(i) 软包电池极端条件安全测试。
1Li||NCM811 电池 1 C 循环500 圈保持 70.8%,容量 119 mAh g⁻¹
2)高载量(5.23 mg cm⁻²)仍稳定循环,0.2 C 50  192 mAh g⁻¹
3)软包电池 0.3 C 循环 100 圈,弯折、折叠、切割、按压均正常供电。
【结论总结】
本研究开创溶剂化调控共晶基聚合物电解质全新路线,一次性解决固态聚合物电解质三大核心瓶颈:1)配位竞争释锂:IL 优先配位 PDA,解除羰基溶剂化陷阱,Li⁺传输更顺畅;2)共晶连续通路:丁二腈基共晶构建 3D 高速离子通道,室温电导达 2.3 mS cm⁻¹3)双盐 + FEC 界面:原位形成富 LiF/Li₃N 致密 SEI,锂负极稳定1000 h4)高压宽窗:氧化窗口达5.1 V,适配 NCM811 高压正极,软包安全实用。该工作建立聚合物基体共晶电解质溶剂化结构协同设计新范式,为高安全、高电导、长寿命固态锂金属电池提供工业化可行方案。
【文献速递】
Eutectic-Based Polymer Electrolyte With High Ionic Conductivity by Regulating Solvation for Solid-State Lithium Metal Batteries.Angewandte Chemie International Edition, 2026; https://doi.org/10.1002/anie.7290677
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  1. CONNECT:[ UseTime:0.001042s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001631s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000765s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000763s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001373s ]
  6. SELECT * FROM `set` [ RunTime:0.011381s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001604s ]
  8. SELECT * FROM `article` WHERE `id` = 558054 LIMIT 1 [ RunTime:0.007301s ]
  9. UPDATE `article` SET `lasttime` = 1781475056 WHERE `id` = 558054 [ RunTime:0.024508s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.003613s ]
  11. SELECT * FROM `article` WHERE `id` < 558054 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006693s ]
  12. SELECT * FROM `article` WHERE `id` > 558054 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001419s ]
  13. SELECT * FROM `article` WHERE `id` < 558054 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010408s ]
  14. SELECT * FROM `article` WHERE `id` < 558054 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.105371s ]
  15. SELECT * FROM `article` WHERE `id` < 558054 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010152s ]
0.357443s