Effects of dislocation mechanics on diffusion-induced stresses within a spherical insertion particle electrode

Wei, Pengfei; Zhou, Jianqiu; Pang, Xunming; Liu, Hongxi; Deng, Kunjun; Wang, Guangxu; Wu, Yunbo; Chen, Bingbing

doi:10.1039/c3ta13925e

Cited by 42 publications

(23 citation statements)

References 36 publications

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“…At the same time, Chen [24] also developed the dislocationinduced stress and energy during lithium-ion diffusion in the thin film electrode. The result showed that dislocationinduced stress can lower the tensile stress and even convert the state of stress from tensile to compressive [23]. Their study can provide a new strategy to optimize the spherical electrode and prolong the battery life.…”

Section: Introductionmentioning

confidence: 91%

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Dislocation effect on diffusion-induced stress for lithiation in hollow spherical electrode

Zhu

Zhou

Chen

et al. 2015

J Solid State Electrochem

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Most lithium-ion battery electrodes undergo large volume changes caused by lithium-ion diffusion within the host particles during insertion. The electrode failure can occur as a result of diffusion-induced stress (DIS). In this work, we will develop a new model to analyze DIS with the influence of dislocation in a spherical electrode. As simple one-dimension models, solid and hollow spherical electrode particles are investigated. The results show that the effect of dislocation can relieve the DIS and even make tensile stress to become compressive stress, which differs from the classical solutions. We also compare the stress of dislocation generation in hollow sphere and solid sphere. It is shown that dislocation-induced stress in hollow spherical electrode is larger than in solid spherical electrode. In addition, based on the analytic solutions, the effect of the wall thickness of hollow sphere on DIS and dislocation-induced stress will be discussed in the hollow spherical electrode during insertion. As the wall thickness of hollow spherical electrode decreases, dislocationinduced stress increases and DIS decreases. So, dislocationinduced stress and the wall thickness will be important factors for hollow spherical electrode. These factors may help guide the development of new materials for lithium-ion battery with enhanced mechanical durability and identify battery operating conditions.

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Section: Introductionmentioning

confidence: 91%

“…Recently, Wei et al [23] developed a spherical dislocation model to consider the effect of dislocation mechanics on DIS in a spherical particle electrode. At the same time, Chen [24] also developed the dislocationinduced stress and energy during lithium-ion diffusion in the thin film electrode.…”

Section: Introductionmentioning

confidence: 99%

Dislocation effect on diffusion-induced stress for lithiation in hollow spherical electrode

Zhu

Zhou

Chen

et al. 2015

J Solid State Electrochem

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“…These equations reduce to the well-known expressions of the stress when the misfit dislocation and phase transformed can be ignored in the electrode particle during charging [17].…”

Section: LImentioning

confidence: 99%

“…13 So a large number of literature had been devoted to the modeling of Li-ion battery using volume-averaged methods to analyze the fracture phenomena in the electrode particle. [14][15][16] Recently, we [17][18][19] have analyzed the effects of dislocation and bend of nano-scaled electrodes on the stresses or strain energy and proposed fracture criteria for insertion electrodes.…”

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confidence: 99%

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Effect of Misfit Dislocation on Li Diffusion and Stress in a Phase Transforming Spherical Electrode

Chen

Zhou

Zhu

et al. 2015

J. Electrochem. Soc.

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The Li-ion battery electrode materials generally experience significant volume change during lithium diffusion. These volume changes lead to diffusion induced stress. Diffusion induced stress(DIS) will cause fracture and nucleation in the electrode. Many electrode materials undergo formation of two or more phases during lithium insertion. By analyzing the process of lithiation, the DIS in phase transforming electrodes using a core-shell model structural is investigated. The new model considering the misfit dislocation effect is established to analyze the stress distribution in the nanoparticle electrode. We observe that the magnitude of DIS can be affected by the misfit dislocation. In addition, the concentration jumps is also affected by the misfit at phase boundaries that result in stress discontinuities, which in turn can cause cracking. The influence of the mechanical properties of the two phases on stress evolution, stress discontinuity, and misfit dislocation effect are clarified. What's more, the Tresca stress is also expounded in the Li-ion battery. The effect of misfit dislocation and the phase transforming on the Tresca stress is clarified. The trends obtained with the model may be used to help tune electrode materials with appropriate interfacial and the misfit dislocation so as to increase the durability of battery electrodes. Li-ion battery is widely used in portable equipment because of their high energy density, high efficiency of charging and low weight compared to conventional cells.1-3 To achieve a higher energy density in the Li-ion battery, new anode materials are being intensively studied as potential such as silicon. However, many investigations [4][5] found that there exist very large stress and volume change during lithiation. Si 6-9 is one of the most promising anode materials used in Li-ion battery electrode because of a theoretical capacity of 4200 mAhg −1 with the formation of Li 4.4 Si. However, owing to volume change (up to 400%), [10][11][12] there is a large stress which leads to serious electrode irreversible capacity and poor cyclability during lithiation. 13So a large number of literature had been devoted to the modeling of Li-ion battery using volume-averaged methods to analyze the fracture phenomena in the electrode particle.14-16 Recently, we [17][18][19] have analyzed the effects of dislocation and bend of nano-scaled electrodes on the stresses or strain energy and proposed fracture criteria for insertion electrodes.However, It is known that lithium insertion often leads to the formation of lithiation and delithiation phase depending on electrode materials and the state of charge in Li-ion battery. In studying the stress evolution during electrochemical cycling, the current research approach used in the community of Li-ion battery has strongly relied on DIS, which is based on the theory of linear elasticity. Many of these models assume that the electrode particle remains in single phase during lithiation. Aifantis et al. 20 adopted Griffith's criteria to estimate the critic...

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Ultrafast Carbothermal Shock Synthesis of Wadsley–Roth Phase Niobium‐Based Oxides for Fast‐Charging Lithium‐Ion Batteries

Wu,

Kang,

Chen

et al. 2024

Adv Funct Materials

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Wadsley–Roth phase niobium‐based oxides show potential as anode candidates for fast‐charging lithium‐ion batteries. Traditional synthesis methods, however, usually involve a time‐consuming calcination process, resulting in poor production efficiency. Herein, a novel carbothermal shock (CTS) method that enables the ultra‐fast synthesis of various Wadsley–Roth phase Nb‐based oxides within seconds is introduced. The extremely rapid heating rates enabled by CTS alter the reaction mechanism from a sluggish solid‐state process to a swift liquid‐phase assisted one and drive the chemical reactions away from equilibrium, thereby generating abundant oxygen vacancies and dislocations. Theoretical calculations reveal that oxygen vacancies significantly lower the energy barrier for Li+ diffusion and enhance the intrinsic electronic conductivity. Moreover, dislocations help convert the surface tensile stress arising from Li+ intercalation into compressive stress, effectively improving the structural integrity during cycling. Notably, this approach can also be applied to synthesize LiFePO4 cathode materials under ambient conditions, eliminating the requirement for inert atmospheres. Consequently, the CTS‐synthesized Nb14W3O44||LiFePO4 battery demonstrates reversible structural evolution validated by in situ XRD and exceptional cycling ability (e.g., 0.0065% capacity decay per cycle at 4 A g−1 over 3000 cycles). Importantly, the Nb14W3O44||LiFePO4 configuration also shows enhanced thermal stability in the Ah‐level pouch cell nail penetration test, confirming its feasibility.

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Effects of dislocation mechanics on diffusion-induced stresses within a spherical insertion particle electrode

Cited by 42 publications

References 36 publications

Dislocation effect on diffusion-induced stress for lithiation in hollow spherical electrode

Dislocation effect on diffusion-induced stress for lithiation in hollow spherical electrode

Effect of Misfit Dislocation on Li Diffusion and Stress in a Phase Transforming Spherical Electrode

Ultrafast Carbothermal Shock Synthesis of Wadsley–Roth Phase Niobium‐Based Oxides for Fast‐Charging Lithium‐Ion Batteries

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