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孙学良院士领衔!东方理工大学王长虹/郑州大学于玉然JACS:超高碲含量低压全固态锂碲电池研究!

  • 2026-06-13 06:08:43
孙学良院士领衔!东方理工大学王长虹/郑州大学于玉然JACS:超高碲含量低压全固态锂碲电池研究!

导读

全固态电池(ASSBs)凭借其优异的安全性能、宽泛的工作温度区间以及与高能电极材料的良好适配性,被公认为是极具发展潜力的下一代储能技术方向。不过,尽管具备这些突出优势,高能量密度全固态电池的实现仍面临核心瓶颈 ——  - 固界面接触不良、运行需施加较高堆压,以及传统电极材料(例如硫基正极)因电子与离子电导率偏低而导致的反应动力学迟缓问题,这些因素从根本上制约了其性能提升。因此,研发兼具快速反应动力学特性与高能量密度的新型电极材料,成为推动全固态电池技术突破的关键需求。碲(Te)作为一种极具潜力的正极材料,拥有极高的体积容量(2621mAh cm⁻³,对应密度 ρ=6.24g cm⁻³)和优良的质量比容量(420mAh g⁻¹),性能表现远超传统过渡金属氧化物正极。更为突出的是,碲的本征电子电导率高达 2000mS cm⁻¹,相较于典型的硫(S,电导率仅 5×10⁻²⁸mS cm⁻¹)和硒(Se,电导率 1×10⁻²mS cm⁻¹),其数值高出数个数量级。在锂化过程后,生成的 Li₂Te 仍能保持良好的电子电导率(约 10⁻³mS cm⁻¹)和优异的离子电导率(理论值约 1mS cm⁻¹),分别较 Li₂S1.2×10⁻⁶mS cm⁻¹)和 Li₂Se2.8×10⁻²mS cm⁻¹)提升约 10⁶倍和 10² 倍。这些综合性能赋予了碲优异的电化学可逆性和快速反应动力学,使其成为适配高倍率、高体积能量密度锂金属电池的理想正极材料。从理论层面来看,Li-Te 电池可实现 1960Wh L⁻¹644Wh kg⁻¹)的超高理论体积能量密度,且近年来已在液态电解质体系中得到了广泛的研究与探索。但值得注意的是,尽管碲具有卓越的本征电化学性能,目前关于全固态构型下 Li-Te 电池的相关研究仍处于空白状态。

成果简介

近期,宁波东方理工大学孙学良院士王长虹团队研究构建了一种纳米结构的Te₉₁@LPSC-350复合物,其中约10nmTe畴域均匀嵌入在非晶态Li₅.₅PS₄.₅Cl₁.₅(LPSC)基体中,具有91wt%的超高Te含量和紧密的固-固接触。该纳米复合物表现出高电子电导率(121mS cm⁻¹)和良好的离子电导率(锂化后为0.1mS cm⁻¹),能够在固态中实现超快且高度可逆的Te氧化还原反应。因此,采用Te₉₁@LPSC-350纳米复合物正极的ASSBs0.25mA cm⁻²下实现了420mAh g⁻¹的理论容量,在12.5mA cm⁻²下维持了超过13000次循环的超长循环稳定性,并实现了21mAh cm⁻²的高面容量。此外,基于LiTe₉₁@LPSC-350的全固态Li-Te软包电池在2.5MPa下经过200次循环后仍保持81%的初始容量,能量密度为1100Wh L⁻¹。值得注意的是,通过利用碲在气化-冷凝过程中100%的选择性,可以实现碲的直接回收。这些结果表明,全固态Li-Te电池是一种安全、高能量密度且可持续储能技术。该成果以Ultrahigh Te-Content Low-Pressure All-Solid-State Li-Te Batteries为题发表于Journal of the American Chemical Society期刊,王长虹、孙学良院士、郑州大学于玉然为论文共同通讯作者。

图文导读

|  基于Te的全固态正极的设计原理和优势。(a) 各种正极体系理论质量比容量和体积容量的比较。(b) 各种正极体系的本征σe⁻(例如,SSeNCM,和Te)以及锂化相(例如,Li₂SLi₂SeNCM,和Li₂Te)中理论σLi⁺的比较。(c) 已报道的固态正极的典型活性材料负载量(重量分数)与该研究工作(Te)正极的对比,使用稳定循环所需的活性材料分数作为基准(d) 包含固体电解质、导电碳和活性材料(例如SSe,和NCM)的传统全固态复合正极的示意图。(e) 通过球磨获得的纳米复合Te₉₁@LPSC-350正极的示意图。

|Te@LPSC正极的结构与性能。(a) Te₉₅@LPSC-350Te₉₁@LPSC-350Te₈₀@LPSC-350正极(LPSC含量分别为5920wt%,均在350rpm下研磨)以及Te₉₁@LPSC-200/350/500正极(200350500rpm)的电子电导率和离子电导率。(b) Te₉₁@LPSC-200/350/500正极的首圈充放电曲线。(c) Te₉₁@LPSC-200/350/500正极,以及原始TeLPSCXRD图谱。(d) Te₉₁@LPSC-200/350/500正极的FIB-SEM图像。(e) Te₉₁@LPSC-350HRTEM图像和(f) STEM-EDS图像。(g) 原始TeTe₉₁@LPSC-350XPS Te 3d谱图。Te₉₁@LPSC-350颗粒的AFM图像,显示了对(h)表面粗糙度(Ra:算术平均粗糙度,Rq:均方根粗糙度)(i)杨氏模量分析。

3 | Te复合正极的电化学性能。(a) Te₉₁@LPSC-200Te₉₁@LPSC-350Te₉₁@LPSC-50025°C下的循环稳定性。(b) Te₉₁@LPSC-350dQ/dV数据。(c) Te₉₁@LPSC-200Te₉₁@LPSC-350Te₉₁@LPSC-50025°C下的倍率性能。(d) Te₉₁@LPSC-3505mA cm⁻²下的高电流密度运行。(e) Te₉₁@LPSC-35055mg cm⁻²负载下的超高负载性能。(f) Te₉₁@LPSC-35012.5mA cm⁻²下的高电流密度运行。(g) 该研究的Te正极与先前报道的S/Se/NCM体系的性能对比。(h) 2.5MPa低堆压下的Te₉₁@LPSC-350正极软包电池。(i) -10°C低温下的Te₉₁@LPSC-350正极软包电池。

4 | Te₉₁@LPSC-350正极的机理与结构解析。(a) 初始态、首次循环放电至1.1V后以及100次循环后充电至2.5V后的截面FIB-SEM图像;比例尺:5μm(b) 1.1-2.5V vs. Li⁺/Li电位范围内收集的非原位XRD图谱。追踪纳米尺度相演变的HRTEM图像:放电至(c)1.7V(d)1.6V(e)1.1V(f) 根据相图计算得出的热力学稳定Li-Te相,以及其结构示意图和形成能。(g) 首圈循环过程中的原位DRT,以及初始态、完全放电态(1.1V)和完全充电态(2.5V)的离子电导率。

5 | 基于Te的电池的可持续回收性与可行性分析。(a) TeLiAlCuLPSC的升华温度。(b) 气化-冷凝回收装置示意图。(c) 废弃Te₉₁@LPSC-350正极材料的热重分析曲线。(d) 回收Te与原始商业TeXRD图谱,以及回收Te的回收率和纯度。(e) 基于TeASSBs可行性分析的雷达图基准对比。

总结与展望

综上,本研究提出了一种基于可规模化球磨工艺的合成策略,成功制备出 Te  LPSC 的纳米复合正极材料。在该复合材料中,尺寸约为 10nm  Te 畴域被均匀分散并嵌入至非晶态 LPSC 基体内部,形成了结构均一的 Te₉₁@LPSC-350 纳米复合物。该纳米复合物构建了连续贯通的离子与电子传输网络,即便在活性材料含量高达 91wt% 的极端条件下,仍可实现 Te 物种快速且高度可逆的氧化还原反应,有效解决了传统电极活性材料含量与反应动力学之间的矛盾。基于 Te₉₁@LPSC-350 纳米复合物构建的正极,展现出全方位的优异电化学性能:不仅实现了 21mAh cm⁻² 的高面容量,还具备长达 13000 次循环的卓越循环稳定性,同时达成 1100Wh L⁻¹ 的高体积能量密度;更为重要的是,该正极可在 2.5MPa 的低堆压环境下稳定工作,且即便处于 - 10°C 的低温条件下,其电化学性能也能保持稳定,突破了全固态电池对工作环境的严苛要求。此外,Te 自身具有较低的升华温度这一特性,使得其可通过简单高效的气化 - 冷凝工艺实现回收再利用,这一优势显著提升了该电池体系的成本效益与环境可持续性。总体而言,本研究通过系统的实验与性能验证,明确证实了全固态 Li-Te 电池具备安全可靠、体积能量密度高、循环寿命长且可持续的核心优势,为下一代先进储能技术的发展提供了全新的解决方案与研究思路。

原文链接:

https://doi.org/10.1021/jacs.5c23309

转载自:新威NEWARE

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  1. CONNECT:[ UseTime:0.000586s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000765s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001549s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000705s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000539s ]
  6. SELECT * FROM `set` [ RunTime:0.000208s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000596s ]
  8. SELECT * FROM `article` WHERE `id` = 549028 LIMIT 1 [ RunTime:0.000973s ]
  9. UPDATE `article` SET `lasttime` = 1781410083 WHERE `id` = 549028 [ RunTime:0.000953s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000243s ]
  11. SELECT * FROM `article` WHERE `id` < 549028 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000714s ]
  12. SELECT * FROM `article` WHERE `id` > 549028 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000435s ]
  13. SELECT * FROM `article` WHERE `id` < 549028 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010938s ]
  14. SELECT * FROM `article` WHERE `id` < 549028 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001228s ]
  15. SELECT * FROM `article` WHERE `id` < 549028 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007022s ]
0.099724s