Heterogeneous Reinforcements to Mitigate Li Penetration through Solid Electrolytes in All‐Solid‐State Batteries
Heterogeneous Reinforcements to Mitigate Li Penetration through Solid Electrolytes in All‐Solid‐State Batteries
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DOI：
10.1002/aenm.202201804
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发表时间：
2022-08
影响因子：
27.8
通讯作者：
Chunhao Yuan;B. Sheldon;Jun Xu
中科院分区：
文献类型：
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作者：
Chunhao Yuan;B. Sheldon;Jun Xu
枝晶生长是导致全固态电池（assb）循环劣化的主要因素之一。然而，由于力学和电化学的内在竞争因素，使用单一优势材料形成固体电解质遇到了一些挫折。受“砖-砂浆”结构的启发，提出了在固体电解质（SE）中嵌入异质块（HBs）的策略，以减轻和抑制枝晶生长引起的内部短路（ISCs）。建立了基于相场的多物理场模型来描述枝晶的生长行为。结果表明，HBs和SE之间的特征长度比e是主导枝晶生长路径的控制因素。结果表明，单个长HB和多个中等长度的特定布局HB可以抑制和转移枝晶生长，完全避免ISCs的发生。对于短HB病例，HB可以在一定程度上延迟ISC。结果表明，在SE中添加适当设计的非均质层可以有效地阻挡枝晶，并定义所需的力学性能域。这项工作提供了对枝晶生长和SE裂纹的多物理场机制理解，并为长寿命assb的SE材料选择和结构设计开辟了新的视角。
Dendrite growth is one of the leading factors that cause cycling deterioration for all‐solid‐state batteries (ASSBs). However, using a single dominant material to form the solid electrolyte has encountered several setbacks due to the intrinsically competing factors in mechanics and electrochemistry. Inspired by the “brick‐and‐mortar” structure, a strategy of embedding heterogeneous blocks (HBs) within the solid electrolyte (SE) is proposed to mitigate and suppress dendrite growth‐induced internal short circuits (ISCs). A phase‐field‐based multiphysics model is established to describe the dendrite growth behavior. Results reveal that the characteristic length ratio e between the HBs and SE is the governing factor that dominates the dendrite growth path. The results show that a single long HB and multiple HBs in medium length with specific layouts can suppress and divert dendrite growth and avoid ISCs completely. For short HB cases, HBs can delay the ISC to a certain extent. The results imply that adding an appropriately designed heterogeneous layer into the SE will effectively block dendrites, and also define desired mechanical property domains. This work provides a multiphysics mechanistic understanding of the dendrite growth and SE cracking and opens new perspectives for the material selection and structural design of SEs for long lifecycle ASSBs.