Electrochemomechanical coupled behaviors of deformation and failure in electrode materials for lithium-ion batteries

Liang, HuanZi; Zhang, Xingyu; Yang, Le; Wu, Yikun; Chen, Haosen; Song, Wei‐Li; Fang, Daining

doi:10.1007/s11431-018-9485-6

Cited by 14 publications

(4 citation statements)

References 177 publications

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“…[ 1 ] Moreover, the Si anode has a slightly higher reaction potential of 0.3 V than graphite, thus reducing the short‐circuiting risk due to lithium dendrite growth and improving the safety performance of LIBs. [ 2,3 ] At the same time, the Si content in the earth's crust reaches up to 26.4%, only less to oxygen, making it highly productive and low‐cost. [ 4 ] However, the commercialization process of Si in conventional LIBs using liquid electrolyte is restricted by huge volume expansion/shrink (>300%) during lithiation/delithiation, resulting in particle fracture, pulverization and finally electrical contact loss with current collector.…”

Section: Introductionmentioning

confidence: 99%

Designing Compatible Ceramic/Polymer Composite Solid‐State Electrolyte for Stable Silicon Nanosheet Anodes

Liu,

Wang,

Wang

et al. 2024

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The commercialization of silicon anode for lithium‐ion batteries has been hindered by severe structure fracture and continuous interfacial reaction against liquid electrolytes, which can be mitigated by solid‐state electrolytes. However, rigid ceramic electrolyte suffers from large electrolyte/electrode interfacial resistance, and polymer electrolyte undergoes poor ionic conductivity, both of which are worsened by volume expansion of silicon. Herein, by dispersing Li1.3Al0.3Ti1.7(PO4)3 (LATP) into poly(vinylidene fluoride)‐hexafluoropropylene (PVDF‐HFP) and poly(ethylene oxide) (PEO) matrix, the PVDF‐HFP/PEO/LATP (PHP‐L) solid‐state electrolyte with high ionic conductivity (1.40 × 10−3 S cm−1), high tensile strength and flexibility is designed, achieving brilliant compatibility with silicon nanosheets. The chemical interactions between PVDF‐HFP and PEO, LATP increase amorphous degree of polymer, accelerating Li+ transfer. Good flexibility of the PHP‐L contributes to adaptive structure variation of electrolyte with silicon expansion/shrinkage, ensuring swift interfacial ions transfer. Moreover, the solid membrane with high tensile limits electrode structural degradation and eliminates continuous interfacial growth to form stable 2D solid electrolyte interface (SEI) film, achieving superior cyclic performance to liquid electrolytes. The Si//PHP‐L15//LiFePO4 solid‐state full‐cell exhibits stable lithium storage with 81% capacity retention after 100 cycles. This work demonstrates the effectiveness of composite solid electrolyte in addressing fundamental interfacial and performance challenges of silicon anodes.

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Section: Introductionmentioning

confidence: 99%

Designing Compatible Ceramic/Polymer Composite Solid‐State Electrolyte for Stable Silicon Nanosheet Anodes

Liu,

Wang,

Wang

et al. 2024

Small

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“…[5][6][7][8] Such a pronounced stress evidently leads to the mechanical degradation of SSBs such as cracks in particles and delamination of the components. 3,5,7,10,[13][14][15] Furthermore, in recent years, stress is being recognized to significantly affect the material properties of the battery electrode and electrolyte materials such as ionic transport, 16,17 defect concentration, 18 electrochemical reaction, 19,20 phase separation, 21,22 and electrode potential. [23][24][25][26][27][28] Therefore, fundamental understandings of the influence of stress on material properties of the battery electrode and electrolyte materials are essential in enhancing the performance and stability of SSBs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Influence of Stress on Li Chemical Potential and Phase Equilibrium in Two-phase Battery Electrode Materials

et al. 2021

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We experimentally evaluated the influence of stress on the Li chemical potential (µLi) and phase equilibrium in the two-phase battery electrode materials through the emf measurements while applying a mechanical load. In our measurements, we prepared an electrochemical cell by depositing a thin film of a two-phase electrode material (LiFePO4 or LiCoO2 in the two-phase region) on each of the solid electrolyte surfaces. Then we applied a mechanical load to the electrochemical cell through four-point bending, and the resulting µLi variation in the electrode material was measured as the emf between the two thin films. Our results indicated that µLi in the two-phase electrode materials immediately changed just after loading and then gradually changed while maintaining a constant mechanical load. Besides, the loading and unloading led to the µLi variation in the opposite direction. Such characteristic µLi variations could be explained by considering the change in the phase equilibrium between the two phases, which led to the Li content variation in the two phases and the stress relaxation due to the volume fraction variation of the two phases. Our results can provide valuable insights regarding the influence of stress on the performances of energy storage devices with two-phase electrode materials.

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“…Silicon has long been identified as a highly promising anode material for next-generation lithium-ion batteries because of its high theoretical specific capacity of 3579 mAh/g (≈10 times the capacity of conventional graphite) for forming Li 4.4 Si [1][2][3]. However, the high capacity results in tremendous volume expansion (≈320%) during lithiation, leading to mechanical degradation such as cracks, pulverization, and delamination followed by rapid capacity fade, low current/Coloumbic efficiency, and short cycle life [4][5][6]. Accordingly, various silicon nanostructures such as nanoparticles, nanowires, and nanotubes have been applied to battery anodes to facilitate stress relaxation and avoid mechanical fractures [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Molecular Understanding of Electrochemical–Mechanical Responses in Carbon-Coated Silicon Nanotubes during Lithiation

Chen

Liu

et al. 2021

Nanomaterials

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Carbon-coated silicon nanotube (SiNT@CNT) anodes show tremendous potential in high-performance lithium ion batteries (LIBs). Unfortunately, to realize the commercial application, it is still required to further optimize the structural design for better durability and safety. Here, the electrochemical and mechanical evolution in lithiated SiNT@CNT nanohybrids are investigated using large-scale atomistic simulations. More importantly, the lithiation responses of SiNW@CNT nanohybrids are also investigated in the same simulation conditions as references. The simulations quantitatively reveal that the inner hole of the SiNT alleviates the compressive stress concentration between a-LixSi and C phases, resulting in the SiNT@CNT having a higher Li capacity and faster lithiation rate than SiNW@CNT. The contact mode significantly regulates the stress distribution at the inner hole surface, further affecting the morphological evolution and structural stability. The inner hole of bare SiNT shows good structural stability due to no stress concentration, while that of concentric SiNT@CNT undergoes dramatic shrinkage due to compressive stress concentration, and that of eccentric SiNT@CNT is deformed due to the mismatch of stress distribution. These findings not only enrich the atomic understanding of the electrochemical–mechanical coupled mechanism in lithiated SiNT@CNT nanohybrids but also provide feasible solutions to optimize the charging strategy and tune the nanostructure of SiNT-based electrode materials.

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Electrochemomechanical coupled behaviors of deformation and failure in electrode materials for lithium-ion batteries

Cited by 14 publications

References 177 publications

Designing Compatible Ceramic/Polymer Composite Solid‐State Electrolyte for Stable Silicon Nanosheet Anodes

Designing Compatible Ceramic/Polymer Composite Solid‐State Electrolyte for Stable Silicon Nanosheet Anodes

Experimental Evaluation of Influence of Stress on Li Chemical Potential and Phase Equilibrium in Two-phase Battery Electrode Materials

Molecular Understanding of Electrochemical–Mechanical Responses in Carbon-Coated Silicon Nanotubes during Lithiation

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