Overview of research on composite electrolytes for solid-state batteries

doi:10.19799/j.cnki.2095-4239.2021.0178

Abstract

Abstract:

At the moment, there are numerous issues with single inorganic solid electrolytes and polymer solid electrolytes, such as low ionic conductivity, dendrite formation, unstable interfaces, and so on. In varying degrees, composite solid electrolytes formed by organic polymer electrolytes and inorganic electrolytes can improve conductivity, inhibit dendrite formation, improve mechanical strength, interface stability, and compatibility. This paper reviews the improvement direction and measures of composite solid-state electrolytes in improving lithium ion conductivity, inhibiting lithium dendrite, and improving electrochemical stability. In addition, the development direction of the composite solid-state battery is anticipated, which serves as a reference for the development and application of the composite solid-state battery.

Key words: composite electrolyte, Ionic conductivity, dendrite suppression in lithium, electrochemical stability

CLC Number:

TM 912

Zhuo XU, Lili ZHENG, Bing CHEN, Tao ZHANG, Xiuling CHANG, Shouli WEI, Zuoqiang DAI. Overview of research on composite electrolytes for solid-state batteries[J]. Energy Storage Science and Technology, 2021, 10(6): 2117-2126.

Figures/Tables 11

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T₁/s	PEO(LiTFSI)	LLZO(5%)-PEO(LiTFSI)	LLZO(20%)-PEO(LiTFSI)	LLZO(50%)-PEO(LiTFSI)
LiTFSI	0.28	0.35	0.52	0.73
LLZO和界面	—	—	0.75	1.33
分解LLZO	—	—	11.36	19.28

⁶Li增加量/%	LLZO	界面	分解LLZO	LiTFSI
LLZO(5%)-PEO(LiTFSI)	—	—	—	23.2
LLZO(20%)-PEO(LiTFSI)	2.3	1.1	10.6	21.2
LLZO(50%)-PEO(LiTFSI)	27.2	6.3	1.2	8.7

LLZO含量/%	离子电导率×10^-4/(S/cm)
LLZO含量/%	25 ℃	40 ℃	50 ℃	60 ℃	70 ℃
0	0.116	0.599	2.12	4.55	6.37
20	0.199	0.518	1.27	2.69	4.80
30	0.308	2.18	6.17	10.9	16.8
40	0.109	0.472	2.35	5.49	6.95
50	0.059	0.141	0.623	1.08	1.62

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