Properties of lithium phosphorus oxynitride (LiPON) solid electrolyte - Li anode interfaces

You Yi-Wei; Cui Jian-Wen; Zhang Xiao-Feng; Zheng Feng; Wu Shun-Qing; Zhu Zi-Zhong

doi:10.7498/aps.70.20202214

Abstract

In recent years, all-solid-state thin-film batteries have been used to power low-energy devices such as microchips, smart cards, microelectromechanical systems, wireless sensors, and implantable medical devices. All-solid-state thin-film batteries have become an important research direction of rechargeable solid-state batteries (SSBs). However, the solid-solid interface between electrodes and electrolytes seriously affects the further improvement of battery performance, which has attracted extensive attention. Lithium phosphorus oxynitride (LiPON) was found to be a useful inorganic electrolyte in lithium batteries because of its favorable electrochemical properties. For instance, LiPON has good electrical and chemical stability, negligible electronic conductivity and excellent cyclability as well as ease of integration with thin film battery with an electrochemical stability window. The LiPON can present two states, i.e. amorphous state and crystalline state. Here, we adopt ab initio molecular dynamics to study amorphous-LiPON/Li(100) interface and crystalline-Li₂PO₂N(100)/Li(100) interface. Our results demonstrate that the atomic inter-diffusion occurs in the interfacial region, forming a thin interfacial layer, and the ionic conductivity is increased after the interface layer has formed. Meanwhile, comparing with the Lipon bulk phase structure, the proportion of Li[O₂N₂], Li[O₃N], and Li[O₄] tetrahedral local structure in the interface layer with Li atom as the center decrease obviously, and the average coordination number of Li-O, Li-N, P-O, and P-N in the interfacial layers also decrease in the LiPON/Li interface. Due to the change of structure and coordination number at the interface, the ionic bonds between Li and O, N are weaker, which explains the increase of ionic conductivity at the LiPON/Li interface. Previous experiments showed that element interdiffusion occurs at the LiPON/Li interface and the interface layer is formed, and found that the decrease in impedance of the interface layer can confirm that the ionic conductivity of the interface layer indeed increases. In addition, the tetrahedral structure of the interface layer will be decomposed into other smaller structures. Our computational results are consistent with the previous experimental results, which indicates the rationality and reliability of our conclusion. This feature plays a positive role in promoting the performance of LiPON electrolytes in practical battery applications.

Keywords:

Authors and contacts

Department of Physics, Xiamen University, Xiamen 361005, China

Corresponding author: Wu Shun-Qing, wsq@xmu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11874307) and the National Key R&D Program of China (Grant Nos. 2016YFA0202601, 2016YFB0901502)

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References

[1]	Bates J B, Dudney N J, Gruzalski G R, Zuhr R A, Choudhury A, Luck C F 1992 Solid State Ionics 53 647
[2]	Yu X, Bates J B, Jellison G E, Hart F X 1997 J. Electrochem. Soc. 144 524 Google Scholar
[3]	Le Van-Jodin L, Ducroquet F, Sabary F, Chevalier I 2013 Solid State Ionics 253 151 Google Scholar
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[8]	Du Y A, Holzwarth N A W 2010 Phys. Rev. B 81
[9]	Senevirathne K, Day C S, Gross M D, Lachgar A, Holzwarth N A W 2013 Solid State Ionics 233 95 Google Scholar
[10]	Sagane F, Ikeda K I, Okita K, Sano H, Sakaebe H, Iriyama Y 2013 J. Power Sources 233 34 Google Scholar
[11]	Schwöbel A, Hausbrand R, Jaegermann W 2015 Solid State Ionics 273 51 Google Scholar
[12]	Sicolo S, Fingerle M, Hausbrand R, Albe K 2017 J. Power Sources 354 124 Google Scholar
[13]	Albertus P, Babinec S, Litzelman S, Newman A 2017 Nat. Energy 3 16
[14]	Bates J B, Dudney N J, Gruzalski G R, Zuhr R A, Choudhury A, Luck C F 1993 J. Power Sources 43 103 Google Scholar
[15]	Suzuki N, Inaba T, Shiga T 2012 Thin Solid Films 520 1821 Google Scholar
[16]	Han F, Westover A S, Yue J, Fan X, Wang F, Chi M, Leonard D N, Dudney N J, Wang H, Wang C 2019 Nat. Energy 4 187 Google Scholar
[17]	Su Y, Falgenhauer J, Polity A, Leichtweiß T, Kronenberger A, Obel J, Zhou S, Schlettwein D, Janek J, Meyer B K 2015 Solid State Ionics 282 63 Google Scholar
[18]	Li G, Li M, Dong L, Li X, Li D 2014 Int. J. Hydrogen Energy 39 17466 Google Scholar
[19]	Le Van-Jodin L, Claudel A, Secouard C, Sabary F, Barnes J P, Martin S 2018 Electrochim. Acta 259 742 Google Scholar
[20]	Hamon Y, Douard A, Sabary F, Marcel C, Vinatier P, Pecquenard B, Levasseur A 2006 Solid State Ionics 177 257 Google Scholar
[21]	Tian H K, Xu B, Qi Y 2018 J. Power Sources 392 79 Google Scholar
[22]	Kresse G, Furthmiiller J 1998 Phys. Rev. B 59 1758
[23]	Kresse G, Furthmuller 1996 Comput. Mater. Sci. 6 15 Google Scholar
[24]	Kresse G, Furthmuller 1996 Phys. Rev. B 54 11169 Google Scholar
[25]	Blochl P E 1994 Phys. Rev. B 50 17953 Google Scholar
[26]	Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865 Google Scholar
[27]	Monkhorst H J, Pack J D 1976 Phys. Rev. B 13 5188 Google Scholar
[28]	Martyna G J, Klein M L, Tuckerman M 1992 J. Chem. Phys. 97 2635 Google Scholar
[29]	Cheng D, Wynn T A, Wang X, Wang S, Zhang M, Shimizu R, Bai S, Nguyen H, Fang C, Kim M C, Li W, Lu B, Kim S J, Meng Y S 2020 Joule 4 2484 Google Scholar
[30]	Mani P D, Saraf S, Singh V, Real-Robert M, Vijayakumar A, Duranceau S J, Seal S, Coffey K R 2016 Solid State Ionics 287 48 Google Scholar
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图 1 (a)−(c) 三种a-LiPON/Li(100)界面沿Z方向的Li原子互扩散图; (d), (e) 两种Li₂PO₂N(100)/Li(100)界面沿Z方向的Li原子互扩散图. 灰色虚线表示原始的界面位置. 结构图中的红色虚线框标注的是固定的末端原子, 蓝色虚线框标注的是形成的界面区域

Figure 1. (a)−(c) Inter-diffusion of Li atoms along the Z direction of three a-LiPON/Li(100) interfaces; (d), (e) inter-diffusion of Li atoms along the Z direction of two Li₂PO₂N(100)/Li(100) interfaces. The gray dotted line indicates the original interface location. The red dotted frames in the structure diagram mark fixed terminal atoms, and the blue dotted frames mark the formed interface areas.

DownLoad: Full-Size Img PowerPoint

图 2 (a)−(c)三种a-LiPON/Li(100)界面和(d) a-LiPON在不同高温下Li⁺的均方位移(MSD); (e) a-LiPON和三种a-LiPON/Li(100)界面体系中温度与Li⁺扩散系数(D_Li)的关系. 图中灰色虚线为300 K对应的位置

Figure 2. (a)−(c) the three a-LiPON /Li(100) and (d) a-LiPON MSD of Li⁺ at different temperatures, (e) Arrhenius plot of Li diffusivity (D_Li) as a function of temperature in a-LiPON and three kinds of a-LiPON/Li (100). The corresponding positions of 300 K are presented by dotted lines.

DownLoad: Full-Size Img PowerPoint

图 3 (a) Li₂PO₂N、(b), (c) Li₂PO₂N(100)/Li(100)界面在不同高温下的MSD; (d)两种Li₂PO₂N(100)/Li(100)界面体系中温度与Li⁺扩散系数(D_Li)的关系. 图中灰色虚线为300 K对应的位置

Figure 3. (a) Li₂PO₂N and (b), (c) Li₂PO₂N(100)/Li(100) MSD of Li⁺ at different temperatures. Arrhenius plot of Li diffusivity (D_Li) as a function of temperature in two kinds of Li₂PO₂N(100)/Li(100). The corresponding positions of 300 K are presented by dotted lines.

DownLoad: Full-Size Img PowerPoint

图 4 a-LiPON体系中各类原子之间的径向分布函数(RDF)

Figure 4. Radial Distribution Functions of a-LiPON.

DownLoad: Full-Size Img PowerPoint

图 5 (a) a-LiPON体系与a-LiPON/Li(100)界面、(b) Li₂PO₂N(100)/Li(100)界面, 以Li原子为中心的Li[O_xN_y]局域结构统计图

Figure 5. Statistics of local structures (Li[O_xN_y]) of (a) a-LiPON and (b) a-LiPON/Li(100) interfaces.

DownLoad: Full-Size Img PowerPoint

表 1 a-LiPON、三种a-LiPON/Li(100)界面和两种Li₂PO₂N(100)/Li(100)界面的室温Li⁺扩散系数(D_Li)与电导率(σ_Li)

Table 1. Li⁺ diffusion coefficient (D_Li) and electrical conductivity (σ_Li) of a-LiPON, three a-LiPON/Li(100) interfaces and two Li₂PO₂N(100)/Li(100) interfaces at room temperature.

Structure	D_Li/(cm²·s^–1)	σ_Li/(S·cm^–1)	σ_Li/(S·cm^–1) exp.
a-LiPON	2.18×10^–9	5.56×10^–5	1.8×10^–6 exp.^[30]
a-Interface-1	4.67×10^–8	9.69×10^–3	—
a-Interface-2	3.44×10^–6	7.14×10^–3	—
a-Interface-3	2.23×10^–6	4.63×10^–3	—
Li₂PO₂N	—	—	8.8×10^–7 exp.^[10]
c-Interface-1	1.19×10^–8	3.19×10^–3	—
c-Interface-2	3.57×10^–8	7.78×10^–3	—

DownLoad: CSV

表 2 LiPON体相与LiPON/Li界面中原子间的平均配位数

Table 2. The average coordination number between atoms in LiPON bulk and LiPON/Li interface

Structure	Li-O	Li-N	P-O	P-N
a-LiPON	2.49	0.50	2.43	0.51
a-LiPON/Li (100)	1.75	0.34	2.07	0.42
Li₂PO₂N	3	1	2	2
Li₂PO₂N (100)/Li (100)	1.63	0.71	1.04	1.72

DownLoad: CSV

[1]	Bates J B, Dudney N J, Gruzalski G R, Zuhr R A, Choudhury A, Luck C F 1992 Solid State Ionics 53 647
[2]	Yu X, Bates J B, Jellison G E, Hart F X 1997 J. Electrochem. Soc. 144 524 Google Scholar
[3]	Le Van-Jodin L, Ducroquet F, Sabary F, Chevalier I 2013 Solid State Ionics 253 151 Google Scholar
[4]	Zhao S l, Wen J b, Zhu Y m, Qin Q 2008 J. Funct. Mater. 39 91
[5]	Nowak S, Berkemeier F, Schmitz G 2015 J. Power Sources 275 144 Google Scholar
[6]	Kim H T, Mun T, Park C, Jin S W, Park H Y 2013 J. Power Sources 244 641 Google Scholar
[7]	Nisula M, Shindo Y, Koga H, Karppinen M 2015 Chem. Mater. 27 6987 Google Scholar
[8]	Du Y A, Holzwarth N A W 2010 Phys. Rev. B 81
[9]	Senevirathne K, Day C S, Gross M D, Lachgar A, Holzwarth N A W 2013 Solid State Ionics 233 95 Google Scholar
[10]	Sagane F, Ikeda K I, Okita K, Sano H, Sakaebe H, Iriyama Y 2013 J. Power Sources 233 34 Google Scholar
[11]	Schwöbel A, Hausbrand R, Jaegermann W 2015 Solid State Ionics 273 51 Google Scholar
[12]	Sicolo S, Fingerle M, Hausbrand R, Albe K 2017 J. Power Sources 354 124 Google Scholar
[13]	Albertus P, Babinec S, Litzelman S, Newman A 2017 Nat. Energy 3 16
[14]	Bates J B, Dudney N J, Gruzalski G R, Zuhr R A, Choudhury A, Luck C F 1993 J. Power Sources 43 103 Google Scholar
[15]	Suzuki N, Inaba T, Shiga T 2012 Thin Solid Films 520 1821 Google Scholar
[16]	Han F, Westover A S, Yue J, Fan X, Wang F, Chi M, Leonard D N, Dudney N J, Wang H, Wang C 2019 Nat. Energy 4 187 Google Scholar
[17]	Su Y, Falgenhauer J, Polity A, Leichtweiß T, Kronenberger A, Obel J, Zhou S, Schlettwein D, Janek J, Meyer B K 2015 Solid State Ionics 282 63 Google Scholar
[18]	Li G, Li M, Dong L, Li X, Li D 2014 Int. J. Hydrogen Energy 39 17466 Google Scholar
[19]	Le Van-Jodin L, Claudel A, Secouard C, Sabary F, Barnes J P, Martin S 2018 Electrochim. Acta 259 742 Google Scholar
[20]	Hamon Y, Douard A, Sabary F, Marcel C, Vinatier P, Pecquenard B, Levasseur A 2006 Solid State Ionics 177 257 Google Scholar
[21]	Tian H K, Xu B, Qi Y 2018 J. Power Sources 392 79 Google Scholar
[22]	Kresse G, Furthmiiller J 1998 Phys. Rev. B 59 1758
[23]	Kresse G, Furthmuller 1996 Comput. Mater. Sci. 6 15 Google Scholar
[24]	Kresse G, Furthmuller 1996 Phys. Rev. B 54 11169 Google Scholar
[25]	Blochl P E 1994 Phys. Rev. B 50 17953 Google Scholar
[26]	Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865 Google Scholar
[27]	Monkhorst H J, Pack J D 1976 Phys. Rev. B 13 5188 Google Scholar
[28]	Martyna G J, Klein M L, Tuckerman M 1992 J. Chem. Phys. 97 2635 Google Scholar
[29]	Cheng D, Wynn T A, Wang X, Wang S, Zhang M, Shimizu R, Bai S, Nguyen H, Fang C, Kim M C, Li W, Lu B, Kim S J, Meng Y S 2020 Joule 4 2484 Google Scholar
[30]	Mani P D, Saraf S, Singh V, Real-Robert M, Vijayakumar A, Duranceau S J, Seal S, Coffey K R 2016 Solid State Ionics 287 48 Google Scholar
[31]	Larfaillou S, Guy-Bouyssou D, le Cras F, Franger S 2016 J. Power Sources 319 139 Google Scholar

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