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1. WO2021036860 - ELECTROLYTE SOLUTION FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING ELECTROLYTE SOLUTION

Publication Number WO/2021/036860
Publication Date 04.03.2021
International Application No. PCT/CN2020/109762
International Filing Date 18.08.2020
IPC
H01M 10/0567 2010.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
056characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
0564the electrolyte being constituted of organic materials only
0566Liquid materials
0567characterised by the additives
H01M 10/0525 2010.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
052Li-accumulators
0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
CPC
H01M 10/0525
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
052Li-accumulators
0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 10/0567
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10Secondary cells; Manufacture thereof
05Accumulators with non-aqueous electrolyte
056characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
0564the electrolyte being constituted of organic materials only
0566Liquid materials
0567characterised by the additives
Applicants
  • 珠海冠宇电池股份有限公司 ZHUHAI COSMX BATTERY CO., LTD [CN]/[CN]
Inventors
  • 廖波 LIAO, Bo
  • 李素丽 LI, Suli
  • 徐延铭 XU, Yanming
  • 李俊义 LI, Junyi
Agents
  • 北京同立钧成知识产权代理有限公司 LEADER PATENT & TRADEMARK FIRM
Priority Data
201910804026.428.08.2019CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) ELECTROLYTE SOLUTION FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING ELECTROLYTE SOLUTION
(FR) SOLUTION ÉLECTROLYTIQUE POUR BATTERIE RECHARGEABLE AU LITHIUM ET BATTERIE RECHARGEABLE AU LITHIUM COMPRENANT CETTE SOLUTION ÉLECTROLYTIQUE
(ZH) 一种锂二次电池用电解液和包括该电解液的锂二次电池
Abstract
(EN)
Disclosed are an electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the electrolyte solution. An electrolyte for a lithium secondary battery comprises an organic solvent, a lithium salt and at least one additive having the structural formula as shown in formula (I), wherein the additive as shown in formula (I) can form a lithium-containing PF2-type compound on the surface of positive and negative electrodes during the first charge of the lithium secondary battery, and the compound has the properties of a strong stability and a high lithium ion content and can significantly improve the low-temperature charging and high-temperature performance of the battery. In addition, the additive as shown in formula (I) has a rational element F content, so that the formation of LiF on the surface of the electrodes can be significantly inhibited, thereby reducing interface impedance and improving the charge-discharge reversibility of lithium ions.
(FR)
L'invention concerne une solution électrolytique pour batterie rechargeable au lithium et concerne une batterie rechargeable au lithium comprenant cette solution électrolytique. Un électrolyte destiné à une batterie rechargeable au lithium comprend un solvant organique, un sel de lithium et au moins un additif possédant la formule développée telle que représentée dans la formule (I), l'additif tel que représenté dans la formule (I) pouvant former un composé de type PF2 contenant du lithium, sur la surface d'électrodes positives et négatives pendant la première charge de la batterie rechargeable au lithium, et le composé possédant les propriétés d'une forte stabilité et d'une teneur élevée en ions lithium et pouvant améliorer significativement la charge à basse température et les performances à haute température de la batterie. De plus, l'additif tel que représenté dans la formule (I) comprend une teneur rationnelle en élément F, de telle sorte que la formation de LiF sur la surface des électrodes peut être significativement inhibée, ce qui permet de réduire l'impédance d'interface et d'améliorer la réversibilité de charge-décharge des ions lithium.
(ZH)
一种锂二次电池用电解液和包括该电解液的锂二次电池,所述锂二次电池用电解质中包括有机溶剂、锂盐和至少一种具有式(I)所示结构式的添加剂,其中,式(I)所示的添加剂能够在锂二次电池第一次充电时在正负极表面形成含锂的—PF 2型化合物,该化合物具有强稳定性和高锂离子的特性,能够显著提高电池低温充电和高温性能。同时,式(I)所示的添加剂中具有合理的F元素含量,可以显著抑制电极表面LiF的形成,降低了界面阻抗,提高锂离子的充放电可逆性。
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Latest bibliographic data on file with the International Bureau