Schematic depiction of the utilized methods and main findings.

Major Contributions
 

1.Development of Quantification Protocol: Establishment of an in situ 7Li NMR spectroscopy methodology tailored for NMC-based anode-free pouch cells, enabling the precise deconvolution of capacity losses into dead lithium formation and interphase consumption.

2.Mechanistic Elucidation:  Revelation that the enhanced reversibility provided by Sn-based alloying layers stems from improved interfacial transport towards the end of lithium dissolution, driven by an irreversible Li22Sn5 phase, rather than the suppression of high-surface-area morphological growth.

3.Performance Enhancement Insight: Demonstration that the functional coating significantly mitigates the accumulation of electronically insulated (dead) lithium deposits and accelerates interphase stabilization, effectively extending the cycle life of anode-free batteries operating with localized high-concentration electrolytes.

主要貢獻
 

1.量化協議的開發：建立專用於 NMC 基無負極軟包電池的原位 7Li NMR 光譜方法，精確將容量損失解析為死鋰形成與界面消耗。

2.機制闡明：揭示錫基合金層所提供的可逆性增強，源於不可逆 Li22Sn5 相在鋰溶解末期對界面傳輸的改善，而非抑制高表面積沉積物（如枝晶）的生長。

3.性能提升解析：證實該功能塗層顯著減少了電子絕緣（死）鋰沉積物的堆積並加速了界面的穩定化，有效延長了使用局部高濃度電解液之無負極電池的循環壽命。