当前位置:首页>郑州>『锂碲电池』郑州大学 & 宁波东方理工 JACS:超高碲含量低压复合正极,构筑 13000 圈超稳全固态 Li-Te 电池

『锂碲电池』郑州大学 & 宁波东方理工 JACS:超高碲含量低压复合正极,构筑 13000 圈超稳全固态 Li-Te 电池

  • 2026-05-24 03:52:24
『锂碲电池』郑州大学 & 宁波东方理工 JACS:超高碲含量低压复合正极,构筑 13000 圈超稳全固态 Li-Te 电池
【背景挑战】
全固态锂碲(Li-Te)电池兼具高体积容量、高本征电导优势,但实用化仍面临三大核心瓶颈:1)传统固态正极活性物质占比低(通常<70%),能量密度大幅牺牲;2)固 - 固界面接触差、离子 / 电子传输失衡,需高压栈压力(10–30 MPa)才能正常工作;3Te  Li₂Te 相变体积形变巨大(≈104%),易导致结构粉化、循环快速衰减;4)碲基固态正极反应机理不清晰,缺乏兼顾高载量、高倍率、长寿命的设计策略。实现超高活性物质占比、低压运行、结构抗形变、超快动力学协同,是全固态 Li-Te 电池突破关键。
【文献导入】
本研究构建Te₉₁@LPSC-350 纳米复合正极:通过高能球磨将≈10 nm Te 域均匀嵌入非晶 LPSC 基质,实现三大突破:碲含量高达91 wt%,兼顾 121 mS cm⁻¹ 高电子电导与嵌锂后 0.1 mS cm⁻¹ 离子电导;纳米限域与非晶电解质缓冲体积形变,电极膨胀仅≈21%,循环后进一步降至≈5%;构建连续离子 - 电子双传导网络,实现 TeLi₂Te 两步可逆转化,无需高压栈、低温仍稳定;实现13000 圈超长循环、21 mAh cm⁻²超高面容量、1100 Wh L⁻¹体积能量密度。
Li-In||Te₉₁@LPSC-350 全固态电池在 2.5 MPa 低压下稳定循环,软包电池 200 圈保持 81% 容量。
【创新点】
结构突破:首次实现91 wt% 超高 Te 含量,构建连续双传导网络,打破活性占比与电导平衡难题;
机制突破:揭示Te→LiTe₃→Li₂Te 两步可逆相变,纳米限域显著抑制体积膨胀与结构粉化;
性能突破:13000 圈超稳循环、21 mAh cm⁻² 高面容量、2.5 MPa 低压、-10 ℃低温全适配;
绿色突破:Te 可通过汽化 - 冷凝100% 选择性回收,回收率 98 wt%、纯度 99.8 wt%
【图文详解】
 1 高碲含量固态正极设计原理与优势
 1 Te 基固态正极设计与优势。(a) 质量 / 体积容量对比;(b) 本征电子电导与嵌锂相离子电导对比;(c) Te₉₁@LPSC-350 复合结构示意图;(d,e) 传统固态正极与本工作复合正极结构差异。
1Te 体积容量达2621 mAh cm⁻³,电子电导≈2000 mS cm⁻¹,远超 SSe
2Li₂Te 离子电导比 Li₂S ≈100 倍,本征动力学更优;
391 wt% 超高 Te 负载,仅 9 wt% LPSC 即可构建连续离子通路。
 2 Te₉₁@LPSC-350 结构、形貌与界面作用
 2 复合材料结构与形貌表征。(a) 离子 / 电子电导随组分与球磨转速变化;(b) 首圈充放电曲线;(c) XRD 图谱;(d) FIB-SEM 截面;(e) HRTEM(f) STEM-EDS 元素分布;(g) Te 3d XPS(h,i) AFM 表面粗糙度与杨氏模量。
1350 rpm 为最优球磨条件,LPSC 完全非晶化、Te 细化至≈10 nm
2)形成Te-S 化学键增强界面结合,提升结构稳定性与离子传输;
3)杨氏模量降至 7.1 GPa,柔性提升,有效缓冲体积形变。
 3 全固态 Li-Te 电池电化学性能
 3 电池电化学性能。(a) 长循环稳定性;(b) dQ/dV 曲线;(c) 倍率性能;(d) 5 mA cm⁻² 长循环;(e) 55 mg cm⁻² 超高载量性能;(f) 12.5 mA cm⁻²  13000 圈循环;(g) 性能对标;(h) 2.5 MPa 低压软包;(i) -10 ℃低温软包。
10.25 mA cm⁻² 释放420 mAh g⁻¹理论容量,库仑效率近 100%
212.5 mA cm⁻² 稳定13000 圈,容量保持 86%,每圈衰减≈0.0011%
355 mg cm⁻² 高载量实现21 mAh cm⁻²超高面容量;
4)软包电池2.5 MPa 低压稳定循环 200 圈,容量保持 81%
 4 相变机理与结构演化
 4 反应机理与结构演变。(a) 原始 / 放电 / 充电后 FIB-SEM 截面;(b) 非原位 XRD(c–e) HRTEM 追踪相变;(f) Li-Te 相图与热力学稳定性;(g) 原位 DRT 与离子电导演化。
1)放电遵循Te→LiTe₃→Li₂Te两步相变,充电完全可逆;
2)电极厚度膨胀仅≈21%,循环后稳定在≈5%,结构不粉化;
3)完全放电后离子电导达0.1 mS cm⁻¹,界面持续活化。
 5 碲高选择性回收与全电池可行性
 5 回收机制与可行性分析。(a) 各组分升华温度对比;(b) 汽化 - 冷凝回收装置;(c) TGA 曲线;(d) 回收 Te  XRD 与纯度;(e) 综合性能雷达图。
1Te 升华温度(452 )远低于 LiAlCuLPSC100% 选择性回收;
2)回收率98 wt%,纯度99.8 wt%,循环性能与新 Te 一致;
3)兼具高首效、高活性占比、超长循环、高可持续性,综合可行性突出。
【结论总结】
本研究开创91 wt% 超高碲含量纳米复合正极全新策略,一次性破解全固态 Li-Te 电池四大痛点:1)双传导网络:9 wt% LPSC 即可构建连续离子通路,配合 Te 本征高电导,实现固 - 固快速反应;2)纳米缓冲结构:≈10 nm Te  + 非晶 LPSC 基质,将体积膨胀由 104% 降至≈5%3)低压稳界面:2.5 MPa 超低压力稳定运行,兼容软包与低温(-10 );4)绿色可回收:汽化 - 冷凝实现 Te 高纯回收,大幅降低成本与环境负荷。该工作建立高载量 - 低压 - 长寿命 - 可回收一体化全固态 Li-Te 电池新范式,为下一代高体积能量密度、超安全、可持续储能提供里程碑方案。
【文献速递】
Ultrahigh Te-Content Low-Pressure All-Solid-State Li−Te Batteries.Journal of the American Chemical Society, 2026; https://doi.org/10.1021/jacs.5c23309
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  1. CONNECT:[ UseTime:0.000714s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001359s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000380s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000665s ]
  6. SELECT * FROM `set` [ RunTime:0.000940s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000607s ]
  8. SELECT * FROM `article` WHERE `id` = 542775 LIMIT 1 [ RunTime:0.008380s ]
  9. UPDATE `article` SET `lasttime` = 1780890240 WHERE `id` = 542775 [ RunTime:0.002285s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 542775 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002518s ]
  12. SELECT * FROM `article` WHERE `id` > 542775 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006159s ]
  13. SELECT * FROM `article` WHERE `id` < 542775 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.012512s ]
  14. SELECT * FROM `article` WHERE `id` < 542775 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008670s ]
  15. SELECT * FROM `article` WHERE `id` < 542775 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016734s ]
0.133092s