Lithium-ion battery electrolyte

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve problems that have not been seen yet, and improve low-temperature discharge performance and high-temperature storage performance, improve high-temperature storage performance, and improve low-temperature performance Effect

Active Publication Date: 2014-10-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201010612413.7 involves the additive VES, which is conducive to the formation of a stable SEI film, but the electrolyte system used in the relevant patent examples is still ethylene carbonate system
To sum up, in order to improve the low-temperature performance of graphite negative electrode batteries, propylene carbonate is completely replaced by ethylene carbonate, and carboxylate solvents are used, while taking into account the high-temperature performance of the battery, which has not been seen in the currently published articles and patents. similar introduction

Method used

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  • Lithium-ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In an inert atmosphere glove box with moisture less than 5ppm, mix 9g of propylene carbonate (PC) and 21g of ethyl propionate (EP) after molecular sieve dehydration, and then slowly add 4.725g of lithium hexafluorophosphate (LiPF 6 ), the temperature of the electrolyte is controlled not to exceed 30°C during the process of adding the lithium salt, and after the lithium salt is completely dissolved, add 1.042g of vinyl sulfite (VES) and 0.695g of vinylene carbonate (VC), and shake well to obtain electrolyte.

[0018] The mass percentage of each component in the electrolyte is as follows: Lithium salt LiPF 6 It is 13%, propylene carbonate (PC) is 24%, ethyl propionate (EP) is 58%, additive VC is 2%, additive vinyl vinyl sulfite (VES) is 3%.

[0019] The prepared electrolyte is injected into a soft package battery with lithium iron phosphate as the positive electrode and graphite as the negative electrode according to the conventional battery manufacturing process. The b...

Embodiment 2

[0027] The mass percentage of each component in the electrolyte is as follows: Lithium salt LiPF 6 It is 13%, propylene carbonate (PC) is 25%, ethyl propionate (EP) is 51%, diethyl carbonate (DEC) is 9%, additive VC is 1%, additive vinyl vinyl sulfite ( VES) is 1%. The electrolyte preparation method, battery production and testing process are the same as in Example 1.

Embodiment 3

[0029] The mass percentage of each component in the electrolyte is as follows: Lithium salt LiPF 6 It is 12%, propylene carbonate (PC) is 49%, ethyl propionate (EP) is 9%, diethyl carbonate (DEC) is 26%, additive VC is 1%, additive vinyl vinyl sulfite ( VES) is 3%. The electrolyte preparation method, battery production and testing process are the same as in Example 1.

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Abstract

The invention discloses a lithium-ion battery electrolyte relating to a lithium ion battery. The lithium-ion battery electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the organic solvent comprises propylene carbonate, chain carboxylic ester and chain carbonic ester, wherein the content of propylene carbonate is 24-58 percent, the content of chain carboxylic ester is 9-58 percent, the content of chain carbonic ester is 0-26 percent, the content of the lithium salt is 9-16 percent, and the content of the additive is 2-10 percent; and the additive is selected from vinylene carbonate, fluoroethylene carbonate, vinyl vinylene carbonate, glycol sulfite, vinyl glycol sulfite, propylene sulfite, dimethyl sulfate or trimethylene sulfate. Propylene carbonate is used for completely replacing ethylene carbonate, and is low in melting point and high in boiling point, thus a temperature window of the electrolyte can be enlarged; and chain carboxylic ester is low in melting point and low in viscosity, thus the solidifying point and the viscosity of the electrode can be reduced, and the conductivity of the electrode is increased. PC (Poly Carbonate) co-block is inhibited by using the additive in the electrolyte, thus the film-forming property for the surface of a negative electrode can be improved, and the high-temperature storage property is improved.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery electrolyte with improved low-temperature discharge characteristics and high-temperature storage characteristics. Background technique [0002] Lithium-ion secondary batteries have become one of the most widely used secondary batteries due to their advantages such as high voltage and high energy density. With the continuous deepening of the marketization of lithium-ion batteries, people's expectations for battery performance are getting higher and higher, and the demand for improving its temperature performance is becoming more and more urgent. [0003] The electrolyte plays the role of conducting lithium ions between the positive and negative electrodes, which directly affects the charge and discharge performance of the battery. To analyze the components of the electrolyte, most commonly used solvents are cyclic carbonates (such as ethylene carbonate, propylene car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 张忠如卞锋菊杨勇
Owner XIAMEN UNIV
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