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Lithium ion battery with adoption of secondary electrolyte injection

A lithium-ion battery and secondary liquid injection technology, which is applied in the field of electrolyte containing acetonitrile or propionitrile, can solve the problems that the reduction reaction cannot be suppressed, the graphite anode cannot be formed, and the performance of the battery is deteriorated, so as to facilitate the electrode reaction , broaden the lower limit of temperature use, and the effect of good performance

Active Publication Date: 2011-11-23
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of acetonitrile-containing electrolyte will cause a large amount of gas to be generated when the battery is formed, and the battery performance will deteriorate
The root cause of this result is that the graphite anode cannot form a good SEI (solid electrolyte interface layer), so the reduction reaction of acetonitrile cannot be suppressed, so the electrolyte containing acetonitrile cannot be directly used as the electrolyte of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The battery cell to be injected is obtained by stirring, coating, cold pressing of pole pieces, winding, packaging, and baking to remove moisture. The cathode is lithium cobaltate, the anode is graphite, and the electrolyte is 1mol / L for one injection. LiPF 6 / (EC, EMC, DEC, VC) for liquid injection, after chemical formation for secondary liquid injection, the electrolyte used is 1mol / L LiPF 6 / AN, AN accounts for 60% of the total solvent, and then the cells are sealed and reshaped to obtain the cells. The model of the cells is 4060D0 (4.0mm in thickness, 60mm in width, and 130mm in length). The impedance test result was 1.3mΩ (1000Hz), and the impedance of the battery core without secondary liquid injection as a comparison group was 2.6mΩ (1000Hz).

[0025] The room temperature conductivity of the mixed electrolyte solution after two liquid injections was 44.9 mS / cm, and the room temperature conductivity of the electrolyte solution used as the comparison group was 9.7...

Embodiment 2

[0027] The battery cell to be injected is obtained by stirring, coating, cold pressing of pole pieces, winding, packaging, and baking to remove moisture. The cathode is lithium cobaltate, the anode is graphite, and the electrolyte is 1mol / L for one injection. LiPF 6 / (EC, EMC, PC, THF) for liquid injection, after chemical formation for secondary liquid injection, the electrolyte used is 1mol / L LiPF 6 / (AN, DMC, MF, THF, EP), AN accounts for 30% of the total solvent, and then the batteries are sealed and shaped to obtain batteries. The model of the batteries is 4060D0 (thickness 4.0mm, width 60mm , the length is 130mm). The impedance test result was 1.6mΩ (1000Hz), and the impedance of the battery core without secondary liquid injection as a comparison group was 2.3mΩ (1000Hz).

[0028] The room temperature conductivity of the mixed electrolyte solution after two injections was 26.8 mS / cm, and the room temperature conductivity of the electrolyte solution used as the compariso...

Embodiment 3

[0030] The battery cell to be injected is obtained by stirring, coating, cold pressing of pole pieces, winding, packaging, and baking to remove moisture. The cathode is lithium cobaltate, the anode is graphite, and the electrolyte is 1mol / L for one injection. LiPF 6 / (EC, EMC, DMC, MF) for liquid injection, after chemical formation for secondary liquid injection, the electrolyte used is 1mol / L LiPF 6 / (AN, DEC, EC, DMC, BL), AN accounts for 10% of the total solvent, and then the batteries are sealed and shaped to obtain batteries. The model of the batteries is 4060D0 (thickness 4.0mm, width 60mm , the length is 130mm). The impedance test result was 2.3mΩ (1000Hz), and the impedance of the battery core without secondary liquid injection as a comparison group was 2.3mΩ (1000Hz).

[0031] The room temperature conductivity of the mixed electrolyte solution after two injections was 11.9 mS / cm, and the room temperature conductivity of the electrolyte solution used as the compariso...

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Abstract

The invention discloses a lithium ion battery with adoption of secondary electrolyte injection, comprising a positive pole, a negative pole, a diaphragm, an electrolyte and an outer package. In the process of manufacturing the battery, the secondary electrolyte injection is adopted; the electrolyte solvent in the first electrolyte injection is one or a combination of more than one of EC (ethylene carbonate), PC (propylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), Gamma-BL (butyrolactone), MF (methyl formate), MA (methyl acetate), EP (ethyl propionate) and THF (tetrahydrofuran) and does not contain acetonitrile and propionitrile; the secondary electrolyte injection is conducted after the formation; and the used electrolyte in the secondary electrolyte injection contains at least one of the acetonitrile and the propionitrile. The electrolyte containing the at least one of the acetonitrile and the propionitrile has the advantage of high normal-temperature conductivity (10-50mS / cm) and low-temperature conductivity (4-20mS / cm at the temperature of -20 DEG C), thereby exceeding the level of an existing electrolyte.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution containing acetonitrile or propionitrile and a lithium ion battery using the electrolyte solution. Background technique [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have the advantages of higher energy density, small self-discharge, and long cycle life, and have been widely used in the field of consumer electronics. [0003] Electrolyte is an important part of lithium-ion batteries. It is the carrier and medium for the transmission of lithium ions between the positive and negative electrodes, and also provides lithium ions. The conductivity of the electrolyte is one of the important parameters of the electrolyte, which has an important impact on the performance of the specific capacity and rate of the electrode active material. [0004] Currently commonly use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M2/36
CPCY02E60/12Y02E60/10
Inventor 韩昌隆付成华许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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