Effect of stress on electrochemical performance of hollow carbon-coated silicon snode in lithium ion batteries

Sun Feng-Nan; Feng Lu; Bu Jia-He; Zhang Jing; Li Lin-An; Wang Shi-Bin

doi:10.7498/aps.68.20182279

Abstract

Electrochemical-mechanical coupling mechanism plays an important role in stress relaxation and cycle stability during charging and discharging of lithium ion batteries. The hollow core-shell structure has become a research hotspot in recent years due to the dual effects of its carbon layer and internal voids on volume expansion. However, the theory of diffusion induced stress has not been used to determine how the elastoplastic deformation of amorphous silicon affects the electrochemical performance of silicon anodes with more complex geometries. Based on the Cahn-Hilliard type of material diffusion and finite deformation, a fully coupled diffusion-deformation theory is developed to describe the electrochemical-mechanical coupling mechanism of silicon-polar particles. According to the interface reaction kinetics, the voltage response curve is obtained. The overall trend of the calculated results accords well with the experimental results, and the predicted stress response is also consistent with the experimental result, and thus verifying the effectiveness of the method. Taking the hollow carbon-coated silicon structure that has received much attention in recent years as an example, we study the electrochemical and mechanical behavior during lithiation of hollow carbon-coated silicon anodes and the capacity decay and stress evolution after charge and discharge cycles. The numerical simulation results show that the stress level of the hollow carbon-coated silicon electrode is significantly lower than that of the solid silicon electrode during the whole lithiation. With the lithiation, the stress difference becomes larger and the stress value at the end of lithiation is reduced by about 27%. It fully shows the dual effects of carbon layer and internal pores on stress relaxation and release. In addition, the concentration gradient in the solid silicon negative electrode is too large, which will result in greater stress. In contrast, the lithium ion concentration inside the hollow carbon-coated silicon particles during lithiation is significantly higher than that of the solid silicon particles, and tends to be evenly distributed, which conduces to alleviating the mechanical degradation of the electrode. At the same time, the hollow carbon coated silicon electrode reaches the fully lithiated state earlier, which fully shows the excellent electrochemical performance of the hollow core-shell structure. Finally, the numerical calculation shows that the capacity attenuation is quite consistent with the experimental measurements. Mitigation of stress levels under structural control delays the attenuation of the capacity of hollow carbon-coated silicon anodes. The excellent cycle stability can be attributed to the dual effect of carbon coating and internal pores on volume expansion and stress relief.

Keywords:

electrochemical-mechanical coupling /
hollow carbon coated silicon particles /
finite element numerical method /
cyclic stability

Authors and contacts

1.
Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300072, China
2.
Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China

Corresponding author: Feng Lu, lufeng@tju.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11272231, 11472186, 11572218).

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References

[1]	程昀, 李劼, 贾明, 汤依伟, 杜双龙, 艾立华, 殷宝华, 艾亮 2015 64 210202 Google Scholar Cheng Y, Li J, Jia M, Tang Y W, Du S L, Ai L H, Yin B H, Ai L 2015 Acta Phys. Sin. 64 210202 Google Scholar
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Cited By

图 1 锂化-脱锂过程中的(a)电压与(b)应力验证

Figure 1. (a) Voltage and (b) stress verification during lithiation-delithiation.

DownLoad: Full-Size Img PowerPoint

图 2 中空碳包覆硅结构的建模　(a) Ashuri等^[24]实验制备的中空碳包覆硅颗粒TEM图像; (b)中空核-壳结构有限元模型示意图; (c)中空核-壳结构有限元网格划分示意图

Figure 2. Modeling of hollow carbon coated silicon structure: (a) TEM image of hollow carbon coated silicon particles reproduced by Ashuri et al.^[24]; (b) finite element model of hollow core-shell structure; (c) schematic diagram of finite element meshing of hollow core-shell structure.

DownLoad: Full-Size Img PowerPoint

图 3 实心硅电极和中空碳包覆硅电极在整个锂化-脱锂阶段应力随时间的演化

Figure 3. Evolution of stress over time in lithiation-delithiation stage with solid silicon electrode and hollow carbon-coated silicon electrode.

DownLoad: Full-Size Img PowerPoint

图 4 t = 1200, 1500, 1800 s时实心硅电极和中空碳包覆硅电极内锂离子浓度分布云图

Figure 4. Cloud distribution of lithium ion concentration in solid silicon electrode and hollow carbon coated silicon electrode at t = 1200, 1500, 1800 s.

DownLoad: Full-Size Img PowerPoint

图 5 实心硅和中空碳包覆硅电极在锂化后期沿径向方向的(a)锂离子浓度、(b)应力和(c)化学势

Figure 5. Distribution of (a) the lithium ion concentration, (b) stress, and (c) chemical potential of solid silicon and hollow carbon coated silicon electrode in the radial direction at the late stage of lithiation.

DownLoad: Full-Size Img PowerPoint

图 6 20次充放电循环过程　(a)理论预测和实验测量容量值的对比; (b)应力随时间的演化

Figure 6. Twenty times charge and discharge cycles: (a) Comparison of theoretical prediction and experimental measurement capacity values; (b) evolution of cauchy stress over time.

DownLoad: Full-Size Img PowerPoint

表 1 材料参数

Table 1. Material parameters.

参数	单位	值
${E_{\rm{a} {\text -} {\rm{Si}}}}$	GPa	80^[31]
${v_{\rm{a} {\text -} {\rm{Si}}}}$	—	0.22^[31]
${c_{\max }}$	mol/m³	$2.95 \times {10^5}$^[32]
$\varOmega $	m³/mol	$8.89 \times {10^{ - 6}}$^[32]
${c_0}$	—	0.005
$\vartheta $	K	298
${D_0}$	m²/s	$1 \times {10^{ - 16}}$^[33]
${k_0}$	mol/s	$3.25 \times {10^{ - 7}}$^[34]

DownLoad: CSV

map

[1]	程昀, 李劼, 贾明, 汤依伟, 杜双龙, 艾立华, 殷宝华, 艾亮 2015 64 210202 Google Scholar Cheng Y, Li J, Jia M, Tang Y W, Du S L, Ai L H, Yin B H, Ai L 2015 Acta Phys. Sin. 64 210202 Google Scholar
[2]	蒋跃辉, 艾亮, 贾明, 程昀, 杜双龙, 李书国 2017 66 118202 Google Scholar Jiang Y H, Ai L, Jia M, Cheng Y, Du S L, Li S G 2017 Acta Phys. Sin. 66 118202 Google Scholar
[3]	张俊乾, 吕浡, 宋亦诚 2017 力学季刊 38 14 Zhang J Q, Lü B, Song Y C 2017 Chin. Quart. Mech. 38 14
[4]	DeLuca C M, Maute K, Dunn M L 2011 J. Power Sources 196 9672 Google Scholar
[5]	Liu N, Lu Z, Zhao J, Mcdowell M T, Lee H W, Zhao W, Cui Y 2014 Nat. Nanotechnol. 9 187 Google Scholar
[6]	Sun Y, Liu N, Cui Y 2016 Nat. Energy 1 16071 Google Scholar
[7]	Jia Z, Li T 2015 J. Power Sources 275 866 Google Scholar
[8]	Yao Y, McDowell M T, Ryu I, Wu H, Liu N, Hu L, Nix W D, Cui Y 2011 Nano Lett. 11 2949 Google Scholar
[9]	Hu B, Ma Z S, Lei W, Zou Y, Lu C 2017 Theor. Appl. Mech. Lett. 7 199 Google Scholar
[10]	Ma Z S, Xie Z C, Wang Y, Zhang P P, Pan Y, Zhou Y C, Lu C 2015 J. Power Sources 290 114 Google Scholar
[11]	Zhang X Y, Song W L, Liu Z L, Chen H S, Li T, Wei Y J, Fang D N 2017 J. Mater. Chem. A 51 2793
[12]	Cho J 2010 J. Mater. Chem. 20 4009 Google Scholar
[13]	Luo F, Liu B, Zheng J, Chu G, Zhong K, Li H, Huang X, Chen L 2015 J. Electrochem. Soc. 162 A2509 Google Scholar
[14]	Terranova M L, Orlanducci S, Tamburri E, Guglielmotti V, Rossi M 2014 J. Power Sources 246 167 Google Scholar
[15]	Hao F, Fang D 2013 J. Electrochem. Soc. 160 A595 Google Scholar
[16]	Su L W, Zhou Z, Ren M M 2010 Chem. Commun. 46 2590 Google Scholar
[17]	Hwa Y, Kim W S, Hong S H, Sohn H J 2012 Electrochim. Acta 71 201 Google Scholar
[18]	Yan D, Bai Y, Yu C, Li X, Zhang W 2014 J. Alloys Compd. 609 86 Google Scholar
[19]	Xu Y, Zhu Y, Wang C 2014 J. Mater. Chem. A 2 9751 Google Scholar
[20]	Shao D, Tang D, Mai Y, Zhang L 2013 J. Mater. Chem. A 1 15068 Google Scholar
[21]	Ma X, Liu M, Gan L, Tripathi P K, Zhao Y, Zhu D, Xu Z, Chen L 2014 Phys. Chem. Chem. Phys. 16 4135 Google Scholar
[22]	Liu N, Wu H, McDowell M T, Yao Y, Wang C, Cui Y 2012 Nano Lett. 12 3315 Google Scholar
[23]	Ashuri M, He Q, Liu Y, Zhang K, Emani S, Sawicki M S, Shamie J S, Shaw L L 2016 Electrochim. Acta 215 126 Google Scholar
[24]	Ashuri M, He Q, Zhang K, Emani S, Shaw L L 2016 J. Sol-Gel. Sci. Technol. 82 201 Google Scholar
[25]	Guo Z, Ji L, Chen L 2017 J. Mater. Sci. 52 13606 Google Scholar
[26]	Zhang J, Lu B, Song Y, Ji X 2012 J. Power Sources 209 220 Google Scholar
[27]	Song Y, Shao X, Guo Z, Zhang J 2013 J. Phys. D: Appl. Phys. 46 105307 Google Scholar
[28]	宋旭, 陆勇俊, 石明亮, 赵翔, 王峰会 2018 67 140201 Google Scholar Song X, Lu Y J, Shi M L, Zhao X, Wang F H 2018 Acta Phys. Sin. 67 140201 Google Scholar
[29]	Zhao Y, Stein P, Xu B X 2015 Comput. Meth. Appl. Mech. Eng. 297 325 Google Scholar
[30]	Anand L 2012 J. Mech. Phys. Solids 60 1983 Google Scholar
[31]	Sethuraman V A, Chon M J, Shimshak M, van Winkle N, Guduru P R 2010 Electrochem. Commun. 12 1614 Google Scholar
[32]	Lu Y, Zhang P, Wang F, Zhang K, Zhao X 2018 Electrochim. Acta 274 359 Google Scholar
[33]	Ding N, Xu J, Yao Y X, Wegner G, Fang X, Chen C H, Lieberwirth I 2009 Solid State Ionics 180 222 Google Scholar
[34]	Pharr M, Suo Z, Vlassak J J 2014 J. Power Sources 270 569 Google Scholar
[35]	Bucci G, Nadimpalli S P V, Sethuraman V A, Bower A F, Guduru P R 2014 J. Mech. Phys. Solids 62 276 Google Scholar

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