Advance and patent analysis of solid electrolyte in solid-state lithium batteries

doi:10.19799/j.cnki.2095-4239.2020.0205

Abstract

Abstract:

Solid-state lithium batteries have become the primary focus in the field of lithium batteries due to their high safety, high energy density, long cycle life, and wide operating temperature range. Using solid electrolyte as the core component of a solid battery is the primary difference from a traditional liquid battery. The solid electrolyte largely determines the performance parameters of the solid lithium battery, including the power density, cycle stability, safety performance, high and low temperature performance, and service life. Therefore, further study of solid electrolytes is ongoing in research institutions of various countries, large electronics companies, and automobile manufacturing companies. This article systematically introduces three types of solid electrolytes that are favored by the industry: Polymer, oxide, and sulfide, and analyzes the latest progress and reported results for each. Among these three types, polymer electrolytes demonstrate good viscoelasticity, excellent machining performance, are lightweight, and transmit lithium ions through the process of "complexation and decomplexation". Oxide solid electrolytes can be found in the crystal state or the glass state. NASICON, perovskite, garnet, and LISICON electrolytes are examples of crystal state electrolytes, while the LiPON electrolyte used in thin film batteries is a popular type of glass oxide electrolyte. Compared with oxide electrolytes, sulfide solid electrolytes exhibit higher ionic conductivity because sulfur ions have a large radius and strong polarization, and for this reason have attracted much attention in recent years. To analyze the development of these electrolytes, a search for solid-state electrolyte patent applications for all-solid-state lithium batteries was performed in the Derwent Innovations Index patent database (DII). After 2015, patent applications for solid electrolytes exhibited a stage of rapid growth. The number of patent applications from Japanese and Korean companies was exceptionally high, from companies such as Toyota, Fuji, and Samsung. These companies have mastered the advanced technology of solid-state lithium batteries. Tracking patent applications allows readers to understand the level and progress of solid electrolytes in different regions, and helps enterprises and universities to seek relevant cooperation and increase investment in related research fields. At present, mass production of solid electrolytes still faces many technical difficulties. It is our hope that in the future, research on solid electrolytes can overcome the technical bottlenecks, realize the industrialization of all-solid lithium batteries, and contribute to the clean and safe use of energy around the world.

Key words: solid electrolyte, all-solid lithium battery, patent analysis

CLC Number:

TM 911

Xi LI, Yajuan YU, Zhiqi ZHANG, Lei WANG, Kai HUANG. Advance and patent analysis of solid electrolyte in solid-state lithium batteries[J]. Energy Storage Science and Technology, 2021, 10(1): 77-86.

Figures/Tables 10

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Table 1

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排名	申请人	专利数量/件	占总数比例/%
1	TOYOTA JIDOSHA KK (丰田株式会社)	293	11.47
2	FUJI FILM CORP(富士胶片株式会社)	134	5.24
3	MURATA MFG CO LTD(村田株式会社)	82	3.21
4	IDEMITSU KOSAN CO LTD (出光兴产株式会社)	61	2.39
5	HITACHI ZOSEN CORP (日立造船株式会社)	47	1.84
6	NGK INSULATORS LTD(NGK绝缘子株式会社)	45	1.76
7	PANASONIC INTELLECTUAL PROPERTY MANAGEME (松下知识产权管理)	45	1.76
8	TOYOTA MOTOR CORP (日本丰田汽车公司)	45	1.76
9	TDK CORP (TDK株式会社)	40	1.57
10	SAMSUNG ELECTRONICS CO LTD (三星电子有限公司)	38	1.49

序号	IPC	技术领域	数量
1	H01M-010/0562	二次电解质，电解质为固体材料	1067
2	H01M-010/052	锂二次蓄电池	763
3	H01M-004/62	活性物质中非活性材料成分的选择，例如胶合剂、填料	579
4	H01M-010/0525	摇椅式电池，即两个电极插入或嵌入有锂的电池；锂离子电池	517
5	H01M-010/0585	只具有板条结构元件，即板条式正极、负极、隔离件的蓄电池	418
6	H01M-004/13	非水电解质蓄电池的电极；其制造方法	348
7	H01B-001/06	主要由其他非金属物质组成的导体或导电物体	311
8	H01M-010/058	非水电解质(H01M-010/39优先)构造或制造	283
9	H01M-004/36	作为活性物质、活性体、活性液体的材料选择	249
10	H01M-010/0565	高分子有机材料，例如凝胶或固体型的锂蓄电池	235

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