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Lithium ion battery anode material and lithium ion battery and anode containing the material

A technology for lithium-ion batteries and positive electrodes of batteries, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve problems such as small capacity, large internal resistance, poor high-current charge-discharge performance and cycle performance, and achieve Effects of improved conductivity, low internal resistance, and excellent cycle performance

Active Publication Date: 2008-06-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of existing lithium-ion batteries such as small capacity, large internal resistance, and poor high-current charge-discharge performance and cycle performance, and provide a battery that can have large capacity, small internal resistance, and high-current charge-discharge performance. and a positive electrode active material with good cycle performance and a positive electrode and a lithium ion battery containing the positive electrode active material

Method used

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Examples

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preparation example Construction

[0026]The preparation method of the positive electrode active material provided by the present invention includes uniformly mixing component A, component B and a binder, the component A is lithium metal phosphate, and the component B is selected from lithium transition metal oxides, One or more of acetylene black, superconducting carbon black, conductive graphite, and conductive carbon fiber, wherein D of component A 50 Particle size 1-6 microns, Part B of D 50 The particle size is 4-20 microns, and the D of component B 50 Particle size larger than component A's D 50 particle size.

[0027] The lithium-ion battery positive electrode provided by the present invention can be prepared by various methods, for example, it can be obtained by coating and / or filling a current collector with a slurry containing a positive electrode active material and a solvent, drying, and compression molding or not. , the amount of the solvent can make the paste have viscosity and fluidity, and ca...

Embodiment 1

[0039] This embodiment illustrates the lithium ion positive electrode material provided by the present invention and the positive electrode and lithium ion battery containing the positive electrode material.

[0040] The D 50 LiFePO with a particle size of 3 microns 4 , 6 parts by weight of D 50 LiCoO with a particle size of 6 microns 2 and 5 parts by weight of D 50 LiCoO with a particle size of 6 microns 2 Acetylene black is mixed to obtain the cathode material provided by the invention.

[0041] Preparation of positive electrode

[0042] The obtained positive electrode material was dispersed in 60 parts by weight of N-methylpyrrolidone (NMP), and fully mixed to prepare positive electrode slurry. Coat the slurry evenly on a 20-micron aluminum foil, dry at 120°C, calender to a thickness of 0.170 mm, and cut into a positive electrode sheet of 450 mm in length and 43 mm in width; wherein the positive electrode sheet contains 5.5 grams of positive electrode active material ...

Embodiment 2

[0052] This embodiment illustrates the lithium ion positive electrode material provided by the present invention and the positive electrode and lithium ion battery containing the positive electrode material.

[0053] Prepare the battery according to the method of Example 1, the difference is that the above D 50 LiFePO with a particle size of 3 microns 4 replace with D 50 LiFePO with a particle size of 1 micron 4 ,D 50 LiCoO with a particle size of 6 microns 2 replace with D 50 LiMn with a particle size of 18 microns 2 o 4 , made into a square lithium-ion battery S2 with a thickness of 5 mm, a width of 34 mm, and a height of 50 mm.

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Abstract

The invention relates to positive electrode active material of a lithium ion battery, which comprises a component A, a component B and binding agent. The component A is lithium metal phosphate, the component B is chosen from one or more of lithium transition metal oxide compound, acetylene black, superconductive soot carbon, conducting graphite and conducting carbon fiber; wherein, the grain diameter D50 of the component A is 1-6 microns, the grain diameter D50 of the component B is 4-20 microns, and the grain diameter D50 of the component B is larger than the grain diameter D50 of the component A. The battery of the positive electrode active material provided by the invention has the advantages that the capacity of the battery is large, the discharge performance of high current is strong, the circulation performance is good, the internal resistance is little, and the overall performance of the battery is greatly improved.

Description

technical field [0001] The invention relates to a positive pole material of a lithium ion battery, a positive pole containing the material and a lithium ion battery. Background technique [0002] Lithium-ion batteries have outstanding features such as high working voltage, light weight, high energy density, small self-discharge, long cycle life, no memory effect, no environmental pollution, and good safety performance. It is an ideal portable battery with high capacity at present. , can be applied to electronic devices such as cameras, mobile phones, notebook computers, and portable measuring instruments. It is also the preferred power source for light-duty high-energy power batteries such as electric vehicles, aerospace, satellites, submarines, and underwater robots in the future. [0003] Lithium-ion batteries are widely used due to their excellent performance. With the rapid development of modern mobile electronic equipment and communication equipment, people have put for...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/48H01M4/62H01M4/02H01M4/66H01M10/40
CPCY02E60/122Y02E60/10
Inventor 沈晞潘福中尤胜萍
Owner BYD CO LTD
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