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Non-aqueous electrolyte for lithium ion battery with ternary positive electrode material and negative silicon-oxygen-carbon composite negative electrode material

A non-aqueous electrolyte and lithium-ion battery technology, applied in non-aqueous electrolytes, electrolytes, secondary batteries, etc., can solve problems such as high-temperature gas production/battery voltage drop, electrolyte interface damage, etc.

Pending Publication Date: 2021-08-24
KUNSHAN SYNERGY SCIENTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of these two positive and negative electrode materials helps to increase the energy density, the positive electrode material is prone to dissolution of cobalt ions / manganese ions during cycling or high-temperature storage, resulting in a solid electrolyte interface (SEI) on the surface of the silicon-oxygen-carbon negative electrode. The membrane is destroyed, which will cause high temperature gas production / severe drop in battery voltage and other disadvantages

Method used

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  • Non-aqueous electrolyte for lithium ion battery with ternary positive electrode material and negative silicon-oxygen-carbon composite negative electrode material
  • Non-aqueous electrolyte for lithium ion battery with ternary positive electrode material and negative silicon-oxygen-carbon composite negative electrode material
  • Non-aqueous electrolyte for lithium ion battery with ternary positive electrode material and negative silicon-oxygen-carbon composite negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The model of the button-type lithium secondary battery used in the embodiment of the present invention is CL1154, the first / second digit of the size definition is the battery diameter of 11mm, the third / fourth digit of the size definition is the battery thickness of 5.4mm, and the shell of the button-type lithium secondary battery Tool parts, including small shell metal, insulating rubber ring and large shell metal.

[0028] The internal structure of the battery includes a positive electrode plate, a negative electrode plate, a separator, a non-aqueous electrolyte, and a conductive handle. The positive electrode material used for the positive electrode plate is a nickel-cobalt-aluminum ternary positive electrode material (the chemical formula is LiNi 0.6 mn 0.2 co 0.2 o 2 (referred to as NMC622)), the negative electrode material used in the negative electrode plate is a silicon-oxygen-carbon composite material, and the material of the separator can be a microporous ma...

Embodiment 2

[0029] Embodiment 2 wherein the solvent part is composed of ethylene carbonate EC, ethyl methyl carbonate EMC wherein, by weight, the electrolyte solvent is 100 parts by weight, wherein ethylene carbonate is 10-30 parts by weight, methyl ethyl carbonate The ester is 70-90 parts by weight. The additives include 3-5% vinylene carbonate, 5-10% fluoroethylene carbonate, 3-5% 1,3-propane sultone, 3-5% ethylene carbonate and 3-5 % Composed of lithium difluorophosphate.

[0030] After the positive and negative plates and the separator are rolled into a dry battery cell, dry it in an oven at 80-85°C for 48 hours, then move it into a drying room for use, and inject the non-aqueous electrolyte solution of Example 1 into the baked dry cell. After being placed in the battery cell and standing for 24 hours, a button lithium secondary battery is obtained after activation.

[0031]In embodiment 1 and embodiment 2, the content of ethylene carbonate, ethyl methyl carbonate, lithium hexafluor...

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a non-aqueous electrolyte for a lithium ion battery with a ternary positive electrode material and a negative silicon-oxygen-carbon composite negative electrode material, which comprises a non-aqueous organic solvent, an electrolyte lithium salt and an electrolyte additive; the non-aqueous organic solvent comprises ethylene carbonate and methyl ethyl carbonate; and the electrolyte additives comprise vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, vinylethylene carbonate and lithium difluorophosphate. The non-aqueous electrolyte contains cyclic carbonate, a negative electrode film-forming agent, a positive electrode film-forming agent and three lithium salts. The lithium ion non-aqueous electrolyte can be applied to improvement of high-temperature and normal-temperature cycle performance.

Description

technical field [0001] The invention belongs to the field of lithium electronic batteries, and discloses a non-aqueous electrolyte solution for a lithium-ion battery with a ternary positive electrode material and a negative electrode silicon-oxygen-carbon composite negative electrode material. The non-aqueous electrolyte contains cyclic carbonate and negative electrode film-forming agent, positive electrode film-forming agent and three kinds of lithium salts. Background technique [0002] Lithium-ion batteries have been widely used in modern people's lives due to their advantages of portability, excellent cycle performance and low self-discharge. A lithium-ion battery is mainly composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte. The positive part is mainly composed of lithium cobalt oxide. The negative electrode material is mainly graphite system. [0003] In order to increase the energy density of lithium-ion batteries, the...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567H01M10/0568H01M10/0525H01M10/42
CPCH01M10/0569H01M10/0567H01M10/0568H01M10/0525H01M10/4235H01M2300/0037H01M2300/0025Y02E60/10
Inventor 蔡霈文黄昌玥沈志鸿邱苾华
Owner KUNSHAN SYNERGY SCIENTECH CO LTD
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