Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery adopting non-aqueous electrolyte solution

A non-aqueous electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of irreversible capacity increase, capacity loss, battery self-discharge, etc., and achieve the goal of improving low-temperature discharge performance, excellent cycle performance, and good cycle life Effect

Inactive Publication Date: 2016-07-13
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, HF will corrode the positive electrode, resulting in the dissolution of metal ions, thereby destroying the structure of the positive electrode material, resulting in capacity loss; Dissolved into the electrolyte, thereby destroying the structure of the positive electrode material, resulting in capacity loss
At the same time, the metal ions dissolved into the electrolyte can easily pass through the SEI to the negative electrode to obtain electrons and be reduced to simple metals, thereby destroying the structure of the SEI, resulting in a continuous increase in the negative el

Method used

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  • Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery adopting non-aqueous electrolyte solution
  • Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery adopting non-aqueous electrolyte solution
  • Non-aqueous electrolyte solution for lithium ion battery and lithium ion battery adopting non-aqueous electrolyte solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the high-voltage lithium-ion battery in this embodiment includes a positive electrode preparation step, a negative electrode preparation step, an electrolyte solution preparation step, a diaphragm preparation step, and a battery assembly step;

[0037] The positive electrode preparation step is: mixing high-voltage positive electrode active material lithium cobaltate, 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 , get the positive electrode slurry, evenly coat the positive electrode slurry on both sides of the aluminum foil, after drying, calendering and vacuum drying, and use an ultrasonic welder to weld the aluminum lead wire to obtain a positive electrode plate, the thickness of the electrode plate is 120- Between 150μm;

[0038] The negative electrode preparation steps are as follows: mixing graphite, conductive carbon black, binder styrene-butadiene rub...

Embodiment 2～15

[0052] Examples 2-15 are the same as Example 1 except that the composition and content of additives (based on the total weight of the electrolyte) are added as shown in Table 1.

[0053] In the table, 1,3-PS is 1,3-propane sultone, PRS is propenyl-1,3-sultone, AN is adiponitrile, SN is succinonitrile, DTD is vinyl sulfate, DCB It is 3-hexenedinitrile, BCN is 1,2-bis(2-cyanoethoxy)ethane, and PEN is 1,3-benzenediacetonitrile.

[0054] Fumarate compounds in each embodiment:

[0055] f 1 dimethyl fumarate

[0056] f 2 methyl propyl fumarate

[0057] f 3 bis(3-trimethoxysilylpropyl) fumarate

[0058] Table 1 shows the content of each component of the electrolyte additive and the battery performance test results.

[0059]

[0060]

[0061]

[0062]

[0063] It can be seen from Table 1 that Examples 1 to 15 adopting the technical solution of the present application have better normal temperature cycle performance, high temperature storage and low temperature disch...

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Abstract

The invention provides a non-aqueous electrolyte solution for a lithium ion battery and a lithium ion battery adopting the non-aqueous electrolyte solution. The non-aqueous electrolyte solution comprises a non-aqueous solvent, lithium salt dissolved into the non-aqueous solvent and an additive, wherein the additive is prepared from fluoroethylene carbonate (FEC), a dinitrile compound and a fumarate type compound. 1 to 6 percent of FEC in the additive can form good SEI at a cathode, to make sure that the battery is high in cycle performance; 1 to 6 percent of the dinitrile compound in the additive can be complexed with metal ions to reduce decomposition of the electrolyte solution and suppress dissolving out of the metal ions as well as protect an anode and improve the battery performance; 0.1 to 2 percent of the fumarate type compound in the additive can form good SEI at the cathode, to improve the low-temperature discharging performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a non-aqueous electrolyte solution for lithium ion batteries and a lithium ion battery using the electrolyte solution. Background technique [0002] Lithium-ion battery is the most competitive battery of the new generation, known as "green energy", and is 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 overall performance, which 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 higher and higher requirements on the energy density of batteries, making it difficult for commercial lithium-ion batteries to meet the requirements. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 占孝云仰永军张彬万华平乐丽华
Owner GUANGZHOU TINCI MATERIALS TECH
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