Electrode active material for lithium ion battery, pole piece of lithium ion battery, preparation method of lithium ion battery pole piece and lithium ion battery

A technology of electrode active materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as battery capacity reduction, achieve high battery capacity, stable performance, and improve the effect of first-time charging efficiency

Inactive Publication Date: 2017-06-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a lithium-ion battery with better cycle and storage characteristics in view of the problem that the lithium-ion battery in the prior art forms an SEI film during the charging and discharging process of the battery, resulting in a decrease in battery capacity. Electrode active material for battery, lithium-ion battery pole piece and preparation method thereof, and lithium-ion battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Positive electrode production:

[0036] Add 930 grams of positive electrode active material LiFePO4, 30 grams of binder PVDF (polyvinylidene fluoride), 20 grams of acetylene black, and 20 grams of conductive carbon black super p Li into 1500 grams of solvent NMP (N-methylpyrrolidone), and then in Stir in a vacuum mixer to form a stable and uniform cathode slurry. The positive electrode slurry is evenly and intermittently coated on both sides of the aluminum foil (aluminum foil size: width 160 mm, thickness 16 microns), then dried at 120 ° C, and the positive electrode is obtained after being pressed by a roller press. The density of the positive electrode 200g / m 2 (double-sided), the compacted density is 2.1g / cm 3 , The thickness is 110~111 microns (including current collector):.

[0037] Production of negative electrode:

[0038] Add 940 grams of negative active material artificial graphite, 30 grams of binder CMC (hydroxymethyl cellulose) and 30 grams of binder SB...

Embodiment 2

[0043] The battery sample S2 was prepared by the same method and steps as in Example 1, except that the preparation of the polymer lithium salt in the preparation of the negative electrode was a terpolymer of acrylonitrile, butadiene and acrylic acid, wherein the raw material was single during polymerization. The molar ratio of bulk acrylonitrile, butadiene, and acrylic acid is 5:45:50 (the mass percentage of lithium ions is 5%).

Embodiment 3

[0045] The battery sample S3 was prepared by the same method steps as in Example 1, the difference being the preparation of the polymer lithium salt in the production of the negative electrode, and the molar ratio of the raw material monomer butadiene and acrylic acid during polymerization was 70:30 (the mass of lithium ions The percentage content is 3.5%).

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Abstract

The invention provides an electrode active material for a lithium ion battery, a pole piece of the lithium ion battery, a preparation method of the pole piece and the lithium ion battery containing the pole piece. The electrode active material contains an active substance and a polymer lithium salt protecting layer coating the surface of the active substance, wherein polymer lithium salt is water soluble polymer lithium salt and is organic electrolyte insoluble in a battery, and a polymer main chain segment of the polymer lithium salt contains polar groups. Therefore, the electrode active material has relatively excellent cycle performance and storage property.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to an electrode active material for a lithium ion battery, a lithium ion battery pole piece and a preparation method thereof, and a lithium ion battery containing the battery pole piece. Background technique [0002] Due to its high voltage, high specific energy, long cycle life, and no environmental pollution, lithium-ion batteries have been widely used in civilian power supplies such as mobile phones and notebook computers to vehicle power supplies for driving cars. In order to adapt to the application of lithium-ion batteries, the battery characteristics of lithium-ion batteries need to be continuously improved. [0003] Generally, during the charging and discharging process of lithium-ion batteries, a layer of solid electrolyte interfacial film, referred to as SEI film, is often formed on the surface of the negative electrode. This SEI film is an insulator of electrons and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/602H01M10/0525Y02E60/10
Inventor 孙华军颜海鹏曾彪张淑静谭志勇
Owner BYD CO LTD
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