当前位置:首页>深圳>『固态锂电』南方科技大学&深圳技术大学EES:阴阳离子协同改性制备非晶铝基氯氧化物超离子导体,构筑长寿命高倍率全固态电池

『固态锂电』南方科技大学&深圳技术大学EES:阴阳离子协同改性制备非晶铝基氯氧化物超离子导体,构筑长寿命高倍率全固态电池

  • 2026-06-19 16:48:21
『固态锂电』南方科技大学&深圳技术大学EES:阴阳离子协同改性制备非晶铝基氯氧化物超离子导体,构筑长寿命高倍率全固态电池
【背景挑战】
全固态锂电池凭借高安全性、高能量密度与长循环潜力,成为下一代储能技术的核心发展方向,固态电解质是决定电池性能的关键核心。目前主流固态电解质分为氧化物、硫化物、卤化物三大体系,各存在明显短板:氧化物电解质高温烧结、界面适配性差;硫化物化学稳定性不足;传统稀土基卤化物电解质性能优异,但原料稀缺、成本高昂,难以规模化应用。铝基氯化物储量丰富、价格低廉,是极具潜力的低成本卤化物电解质。但传统 Li₂.Al.晶体结构规整、配位框架致密,室温离子电导率极低;单一阳离子掺杂或阴离子取代的改性方式提升效果有限,同时材料结构、力学性能、界面兼容性难以兼顾。如何通过结构调控制备高电导、高结构无序度、机械柔性好、电化学稳定的低成本铝基固态电解质,成为全固态电池实用化进程中的关键难题。
【文献导入】
本研究提出异价阴阳离子共改性策略,选用锆、作为掺杂阳离子,氧离子部分取代氯离子,成功制备两种非晶铝基氯氧化物固态电解质:Li₂.Al.Zr.₃Cl₃.₃O₁.₃₅(简称 LAZCO Li₂.Al.Hf.₃Cl₃.₃O₁.₃₅(简称 LAHCO)。阴阳离子共掺杂可大幅提升材料结构无序度,构建连续锂离子传输通道。两种电解质室温离子电导率分别达到 1.63 mS/cm1.65 mS/cm,相较传统Li₃AlCl提升近两个数量级。其中 LAZCO 兼具优异机械形变能力、宽电化学窗口与极低原料成本(45.96 美元 / 千克)。将该电解质搭配 Li₁₀GeP₂S₁₂ 锗磷硫电解质界面层、LiNi.₈₃Co.₁₂Mn.₀₅O₂ 单晶正极组装全固态电池,在 5 C 高倍率下循环 4000 圈后,容量保持率仍可达 90.3%,为低成本长寿命全固态电池提供全新技术路线。
【创新点】
结构创新:采用锆 / 阳离子与氧阴离子共掺杂,诱导材料高度非晶化,打破晶体结构限制,构建高效离子传输网络;
性能创新:离子电导率实现量级提升,同时具备低模量、良好机械柔韧性,可实现低压成型,界面接触紧密无晶界;
机制创新:结合多种表征解析局域配位结构演变,阐明掺杂诱导结构无序、降低离子迁移能垒的内在机理;
应用创新:原料储量大、合成工艺简单、成本低廉,高倍率、高载电芯均表现出优异稳定性,产业化潜力突出。
【图文详解】
 1 电解质物相、电导率、微观结构与核磁表征
不同组分电解质的 X 射线衍射图谱;离子电导率阿伦尼乌斯曲线;各类电解质室温离子电导率与活化能对比;不同掺杂比例样品的离子电导率变化;样品结晶度定量统计;锂固体核磁共振谱图;g LAZCO 低温透射电镜形貌;h LAHCO 低温透射电镜。
1)单一掺杂仅小幅弱化衍射峰,阴阳离子共掺杂后衍射峰基本消失,材料完全转变为非晶态;
2)锆、共改性样品离子电导率大幅提升,最优铝锆比例 7:3,对应最低离子迁移活化能;
3)非晶相占比最高可达 88.9%,非晶结构是实现高离子传导的核心;
4)核磁与电镜结果相互印证,两类改性电解质均呈现均匀无序微观形貌。
 2 局域配位结构与同步辐射表征
铝元素固体核磁共振谱图; K  X 射线吸收谱; L3 边近边吸收谱; L3 边近边吸收谱;锆配位壳层傅里叶变换图谱;配位壳层傅里叶变换图谱;g LAZCO 小波变换图谱;h LAHCO 小波变换图谱。
1)共掺杂引入多种铝氧配位结构,形成多样化局域环境,进一步提升结构无序度;
2)氧离子部分取代氯离子,改变金属配位键长与键型,弱化锂氯相互作用
3)锆氧、铪键稳定存在,配位多面体发生畸变,构建连续无序离子传输通路;
4)多种谱学结果明确阴阳离子共掺杂的配位演变规律,解释电导提升的微观机制。
 3 力学性能、电化学窗口与界面稳定性测试
a LAZCO 原子力显微镜形貌图;杨氏模量分布统计;不同类型电解质模量与成本对比;线性扫描伏安测试得到的电化学稳定窗口;不同界面体系恒流间歇滴定曲线;前三圈循环电压曲线;原位电化学阻抗弛豫时间分布图谱;阻抗二维彩色云图。
1LAZCO 杨氏模量仅 10~11 GPa,低于多数无机固态电解质,具备优异形变能力;
2)材料电化学窗口可达 4.3 V 以上,与高电压单晶正极兼容性良好;
3)界面阻抗在循环过程中保持稳定,无明显副反应发生;
4)该电解质可与 Li₁₀GeP₂S₁₂ 锗磷硫界面层匹配,构筑稳定多层固态体系。
 4 全固态电池电化学综合性能
a LAZCO 基电池倍率性能;b LAHCO 基电池倍率性能;c 0.2 C 下首圈及后续充放电曲线;微分容量曲线;e 1 C 常规长循环性能;面载量 15 mg/cm² 高负载正极电池循环稳定性;g 5 C 超高倍率长循环性能;铝基电解质体系性能横向对比;i循环前后氯元素 X 射线光电子能谱;循环前后氧元素 X 射线光电子能谱。
1)电池倍率性能优异,5 C 大倍率下仍可保持 111 mAh/g 的可逆容量;
2)常规倍率、高载工况下循环寿命优异,界面结构无明显劣化;
35 C 循环 4000 圈容量保持 90.3%,长周期电化学可逆性强;
4)循环后元素价态与组分基本不变,电解质化学稳定性优异。
【结论总结】
本研究开发锆 /  - 氧异价阴阳离子共掺杂技术,成功制备系列非晶铝基氯氧化物固态电解质。阴阳离子协同掺杂诱导材料形成高度无序的非晶结构,重构局域配位环境、降低离子迁移能垒,使室温离子电导率提升两个数量级。该类电解质兼具三大核心优势:一是原料储量丰富、合成工艺简单,原材料成本低;二是机械柔韧性佳,低压即可实现紧密固 - 固接触,适配量产工艺;三是电化学窗口宽,与高电压正极、界面层兼容性优异。基于 LAZCO 搭建的全固态电池,在常规倍率、高负载、超高倍率条件下均实现超长稳定循环。本工作跳出传统稀土基卤化物电解质的研发思路,建立低成本铝基非晶电解质的全新设计策略,阐明结构无序与离子传导的构效关系,为高安全、长寿命、可量产全固态锂电池的电解质开发与工程应用提供了重要参考。
【文献速递】
Amorphous aluminum-based oxychloride superionic conductors via cation–oxygen coupled modification for durable high-rate all-solid-state lithium batteries. Energy & Environmental Science, 2026; https://doi.org/10.1039/d5ee07782f
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  1. CONNECT:[ UseTime:0.000657s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000919s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000304s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000505s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000765s ]
  8. SELECT * FROM `article` WHERE `id` = 618339 LIMIT 1 [ RunTime:0.001352s ]
  9. UPDATE `article` SET `lasttime` = 1782029117 WHERE `id` = 618339 [ RunTime:0.008813s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000294s ]
  11. SELECT * FROM `article` WHERE `id` < 618339 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000405s ]
  12. SELECT * FROM `article` WHERE `id` > 618339 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000402s ]
  13. SELECT * FROM `article` WHERE `id` < 618339 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000838s ]
  14. SELECT * FROM `article` WHERE `id` < 618339 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001983s ]
  15. SELECT * FROM `article` WHERE `id` < 618339 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000770s ]
0.087196s