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>机器学习!南京航空航天大学「国家高层次人才」申来法Science子刊 | 机器学习辅助发现高性能的外向内结构富镍正极!
机器学习!南京航空航天大学「国家高层次人才」申来法Science子刊 | 机器学习辅助发现高性能的外向内结构富镍正极!
2026-06-06 04:28:04
机器学习!南京航空航天大学「国家高层次人才」申来法Science子刊 | 机器学习辅助发现高性能的外向内结构富镍正极!
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随着电动汽车和大型储能设备市场的迅速扩张,对锂离子电池的能量密度、成本及可持续性提出了更高要求。高镍层状氧化物(镍含量
≥90 mol%
)因其高比容量和较低的成本,被视为最具前景的正极材料候选者之一。然而,高镍正极在循环过程中面临严重的结构与界面退化问题,主要表现为由各向异性晶格应变引发的微裂纹、不可逆的
H2-H3
相变导致的电压衰减,以及正极
/
电解液界面副反应引起的容量下降。
传统上,为了抑制这些退化,通常依赖具有磁性的
Co
元素来稳定结构,但钴资源稀缺且价格波动剧烈,降低或去除钴已成为产业界和学术界的共识。如何在
“
低钴
/
无钴
”
条件下通过离子掺杂来有效抑制锂镍混排并稳定体相
/
界面结构,是该领域的核心挑战。
图
1
基于机器学习的掺杂离子筛选逻辑与物理机制验证
南京航空航天大学申来法教授团队
通过一种机器学习方法(随机森林模型结合
SHAP
分析),从大量文献数据中预测并筛选出
Al³⁺
和
Sn⁴⁺
作为高性能高镍正极(
LiNi₀.₉₃Co₀.₀₇O₂
)的理想共掺杂离子。研究发现,非磁性的
Al³⁺
和
Sn⁴⁺
通过一种竞争性掺杂机制,自发形成了独特的
“
由外至内
”
结构:
Sn⁴⁺
倾向于在表面富集形成
Sn-rich
岩盐界面层,而
Al³⁺
则均匀掺杂进入体相晶格。
这种结构设计有效缓解了磁性阻挫引起的
Li/Ni
阳离子混排,抑制了
H2/H3
相共存导致的有害晶格应变,并显著提升了正极
/
电解液界面稳定性。电化学测试表明,改性后的
NCAS
正极在
4.3 V
下循环
200
周后容量保持率高达
96.9%
,电压衰减极小,且在软包全电池中展现出优异的实际应用潜力。
图
2
Al³⁺/Sn⁴⁺
共掺杂正极材料
NCAS
的合成过程与精细结构表征
该项工作报道了一种机器学习辅助的掺杂剂筛选策略,成功将
Al³⁺
和
Sn⁴⁺
引入高镍低钴正极
LiNi₀.₉₃Co₀.₀₇O₂
中,构筑了具有高结构稳定性的
NCAS
正极材料。通过多尺度原位
/
非原位表征与理论计算相结合,阐明了其性能增强机制:竞争性掺杂机制驱动
Al³⁺
均匀固溶于体相以抑制晶格畸变,同时促使
Sn⁴⁺
偏聚于表面形成致密、富锡的界面重构层。
非磁性离子的引入显著削弱了
Ni-O-Ni
的超交换作用,缓解了磁性阻挫驱动的
Li/Ni
混排,从而实现了对体相疲劳开裂和界面副反应的双重抑制。该策略不仅为高电压、高温工况下高镍正极的内外结构调控提供了新思路,也为先进储能系统的理性设计开辟了数据驱动的新途径。
Guihong Mao et al., Machine learning–assisted discovery of outside-in structure Ni-rich cathode with high performance. Sci. Adv.12, eadz8130(2026). DOI:10.1126/sciadv.adz8130
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CONNECT:[ UseTime:0.001091s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001738s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000755s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000659s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001188s ]
SELECT * FROM `set` [ RunTime:0.000516s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.000624s ]
SELECT * FROM `article` WHERE `id` = 556509 LIMIT 1 [ RunTime:0.000879s ]
UPDATE `article` SET `lasttime` = 1780973759 WHERE `id` = 556509 [ RunTime:0.004494s ]
SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000688s ]
SELECT * FROM `article` WHERE `id` < 556509 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001143s ]
SELECT * FROM `article` WHERE `id` > 556509 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001122s ]
SELECT * FROM `article` WHERE `id` < 556509 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005674s ]
SELECT * FROM `article` WHERE `id` < 556509 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004692s ]
SELECT * FROM `article` WHERE `id` < 556509 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001805s ]
0.125635s