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A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of low discharge capacity and poor cycle performance, and achieve the goal of improving low-temperature charge and discharge performance, increasing content, and reducing battery impedance Effect

Active Publication Date: 2018-05-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem solved by the present invention is the defect of poor discharge capacity and cycle performance of lithium ion batteries under low temperature conditions in the prior art, and provides a lithium ion battery electrolyte and Lithium-ion batteries containing the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0041] (1) Preparation of electrolyte

[0042] Ethylene carbonate EC, propylene carbonate PC, ethyl methyl carbonate EMC and diethyl carbonate DEC were added to the lithium hexafluorophosphate solution at a weight ratio of 20:15:15:50, LiPF 6 The concentration is 1mol / L, based on the total weight of the electrolyte, the mass percentage of the film-forming additive fluoroethylene carbonate FEC is 2%, the mass percentage of 1,3-propane sultone PS is 1%, and the mass percentage of 2-methyl Base-5-keto-hexanoic acid methyl ester mass percentage 0.5%.

[0043] (2) Preparation of positive electrode

[0044] Dissolve 90 grams of polyvinylidene fluoride (Atofina, 761# PVDF) in 1350 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare a binder solution, and then 2895 grams of LiCoO 2 (manufactured by FMC Company) was added to t...

Embodiment 2

[0050] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0051] A lithium ion battery was prepared according to the method of Example 1, wherein the difference was the preparation of the electrolyte.

[0052] Lithium hexafluorophosphate LiPF 6 The concentration is 1mol / L, ethylene carbonate EC, propylene carbonate PC, ethyl methyl carbonate EMC and diethyl carbonate DEC are mixed according to the weight ratio of 20:30:15:35, based on the total weight of the electrolyte , film-forming additive vinylene carbonate VC mass percentage is 1%, maleic anhydride SUC mass percentage is 0.25%, adiponitrile ADN mass percentage is 0.2%, 2-ethyl-5-keto-caproic acid methyl ester The mass percentage is 2.0%.

[0053] The final lithium-ion battery A2 of size LP053450AR.

Embodiment 3

[0055] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0056] A lithium ion battery was prepared according to the method of Example 1, wherein the difference was the preparation of the electrolyte.

[0057] Lithium hexafluorophosphate LiPF 6 The concentration is 1mol / L, ethylene carbonate EC, propylene carbonate PC, ethyl methyl carbonate EMC and diethyl carbonate DEC are mixed in a weight ratio of 50:10:15:25, based on the total weight of the electrolyte , the mass percentage of film-forming additive vinylene carbonate VC is 1%, the mass percentage of maleic anhydride SUC is 0.25%, the mass percentage of adiponitrile ADN is 0.2%, 2-isopropyl-6-keto-heptanoic acid methyl The mass percentage of ester is 0.5%.

[0058] The lithium-ion battery A3 of size LP053450AR finally made.

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Abstract

The invention provides a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. The lithium ion battery electrolyte comprises a non-water organic solvent and lithium salt, wherein the non-water organic solvent comprises propylene carbonate. The lithium ion battery electrolyte also comprises an additive having a general formula shown in the description. In the formula, n is in a range of 1-5, R1 is C1-C5 alkane, and R2 is C1-C5 alkane. Based on the total weight of the organic solvent, the content of propylene carbonate is 10-50 wt%, and based on the total weight of the electrolyte, the content of the additive is 0.1-5 wt%. The provided electrolyte enables high and low temperature performance of the battery to be obviously improved, and the operating temperature range of the lithium ion battery electrolyte is broadened. Any one of natural graphite, artificial graphite, and mixed graphite can be selected as a negative electrode of the battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras, video cameras, PDA, MP3, Bluetooth, PMP and many other portable batteries because of their advantages such as high energy density, long cycle life, high open circuit voltage, and safety and pollution-free. Communication, entertainment and other electronic products, and gradually expand the scope of application to electric bicycles, electric vehicles and other fields. [0003] As the marketization of lithium-ion batteries continues to deepen, people's expectations for battery performance are getting higher and higher. At present, it is difficult for commercial lithium-ion batteries to meet the needs of important fields such as electric vehicles, aerospace technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/10
Inventor 李国兵何珍刘卫平
Owner BYD CO LTD
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