Electrolyte containing benzene dinitrile and lithium ion battery applying electrolyte

A technology of electrolyte and phthalonitrile, which is applied in the field of lithium battery preparation, can solve problems such as side reactions, achieve the effects of reducing decomposition, reducing gas production, and improving cycle and high temperature performance

Active Publication Date: 2015-12-09
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] U.S. Patent No. 5,471,862 replaces the ethers in the electrolyte with chain carboxylate to form an electrolyte containing a mixed solvent of chain carboxylate, cyclic carbonate and chain carbonate, avoiding side reactions between ethers and the negative electrode , significantly improved the low-temperature cycle performance and high-temperature storage performance of lithium-ion batteries, but carboxylate solvents will have unavoidable side reactions with the negative electrode

Method used

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  • Electrolyte containing benzene dinitrile and lithium ion battery applying electrolyte
  • Electrolyte containing benzene dinitrile and lithium ion battery applying electrolyte
  • Electrolyte containing benzene dinitrile and lithium ion battery applying electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the preparation method of the lithium ion battery of this embodiment, the coating area density is determined according to the capacity design (1640mAh) of the battery and the capacity of the positive and negative electrode materials. The positive active material was purchased from Hunan Shanshan lithium cobaltate material; the negative active material was purchased from Jiangxi Zichen Technology. The steps for preparing the positive electrode, preparing the negative electrode, preparing the electrolyte, preparing the separator, and assembling the battery are described as follows;

[0034] The steps of preparing the positive electrode are: mixing positive electrode active material lithium cobalt oxide, conductive carbon black and binder polyvinylidene fluoride in a mass ratio of 96.8:2.0:1.2, and dispersing in N-methyl-2-pyrrolidone to obtain Positive electrode slurry, uniformly coat the positive electrode slurry on both sides of the aluminum foil, dry, calender and vacu...

Embodiment 2～18

[0046] Examples 2 to 18 and Comparative Examples 1 to 4 are the same as Example 1, except that the solvent composition, additive composition and content (based on the total weight of the electrolyte) in the electrolyte are added as shown in Table 1. Table 1 shows the content of each component of the electrolyte additive and the battery performance test results. In the table, PP is propyl propionate, GBL is butyrolactone, EP is ethyl propionate, DTD is vinyl sulfate, 1,3-PS is 1,3-propane sultone, and SN is succinonitrile. 1,3-BCB is 1,3-benzenediacetonitrile, and 1,4-BCB is 1,4-benzenediacetonitrile.

[0047] Table 1

[0048]

[0049]

[0050]

Embodiment 7

[0051] Comparing Example 7 with Comparative Example 4 and Example 12 with Comparative Example 3 shows that:

[0052] In Comparative Example 3 without 1,3-benzenediacetonitrile, the capacity retention rate at the 500th cycle of 1C normal temperature cycle decreased from 80.5% to 53.8%. After storage at 85°C for 4 hours, the thickness expansion rate increased from 3.8% to 8.8%. It shows that a small amount of gas is produced, and its capacity retention rate and recovery rate are correspondingly reduced.

[0053] In Comparative Example 4 without fluoroethylene carbonate (FEC), the capacity retention rate at the 500th cycle of 1C normal temperature cycle decreased from 80.1% to 38.1%, indicating that the presence of fluoroethylene carbonate (FEC) can ensure that the battery has excellent Cycle performance.

[0054] Comparing Example 7 with Comparative Example 1 and Comparative Example 2, Comparative Examples 1 and 2 that do not contain carboxylate have obvious swelling when stored at hi...

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Abstract

The invention discloses an electrolyte containing benzene dinitrile and a lithium ion battery applying the electrolyte. The electrolyte containing the benzene dinitrile comprises a non-aqueous solvent, a lithium salt and an additive, wherein the non-aqueous solvent is a carboxylic acid ester compound with a mass percentage of 1-40% in the electrolyte containing the benzene dinitrile; the additive comprises fluoroethylene carbonate (FEC) and at least one of benzene dinitrile compounds having a structure shown in a formula I, the formula I is shown in the specification, and n is an integer from 1 to 3; in 0.01-5% of the benzene dinitrile compound in the additive, double nitrites containing carbons of 1 to 3 are connected at ortho positions, meta positions and para positions of a benzene ring, an acetonitrile radical group (-C-CN) on the benzene ring can be complexed with metal ions such as Co<3+> in a positive active material, thus, electrolyte decomposition is reduced, the dissolution of the metal ions is suppressed, a positive pole is protected, and the high-temperature performance of the battery is improved.

Description

Technical field [0001] The present invention relates to the field of lithium battery preparation. The present invention specifically relates to an electrolyte containing phthalonitrile and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion batteries are the most competitive new generation of batteries, known as "green energy sources", and are the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium-ion batteries have achieved great success in the field of high-energy batteries, but consumers still expect batteries with higher comprehensive performance to come out, and this depends on the research and development of new electrode materials and electrolyte systems. [0003] At present, electronic digital products such as smart phones and tablet computers have increasingly higher requirements for battery energy density, making it difficult for commercial lithium-ion batteries to meet the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0028Y02E60/10
Inventor 仰永军许梦清万华平占孝云
Owner GUANGZHOU TINCI MATERIALS TECH
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