Battery anode, preparation method thereof and lithium ion battery using the same

A lithium-ion battery, cathode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of low charging upper limit voltage, unstable charging system, poor cycle performance, etc.

Active Publication Date: 2013-12-18
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of low charging upper limit voltage of the existing positive electrode, unstable charging system at high voltage, and poor cycle performance, and

Method used

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  • Battery anode, preparation method thereof and lithium ion battery using the same

Examples

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preparation example Construction

[0028] The preparation method of the negative electrode can adopt a conventional preparation method. For example, the negative electrode can be obtained by mixing the negative electrode material with a solvent, coating and / or filling on the conductive substrate, drying, and rolling or not rolling. Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) and One or more of water and alcohol. The amount of the solvent can make the paste have viscosity and fluidity, and can be coated on the conductive substrate. Generally speaking, based on the weight of the negative electrode active material, the content of the solvent is 50-150% by weight, preferably 70-120% by weight. The content of the negative electrode active material and the binder is 40-70% by weight of the total weight of the negative electrode slurry, preferably 45-60% by weight. The amount of the solvent can ...

Embodiment 1

[0033] This example illustrates the positive electrode provided by the present invention, the lithium ion battery containing the positive electrode, and the preparation method thereof.

[0034] (1) Preparation of positive electrode

[0035] Mix and stir 100 g of N-methylpyrrolidone and 3 g of polyvinylidene fluoride until the viscosity of the mixture changes less than 3% within 10 minutes, and then add 3 g of microspherical superconducting carbon black with a particle size of 6.5 μm and stir. The viscosity of the mixed solution changed less than 3% within 10 minutes, and finally 90 grams of positive active material was added, wherein the positive active material contained 5 wt % of layered nickel cobalt lithium aluminate (the median particle size of the particles was 7.27 μm, D 10 =4.93μm,D 50 =7.27μm,D 90 = 11.03 μm) and 95 wt% olivine-type lithium ferrous phosphate (the median particle size is about 750 nm, D 10 =532nm, D 50 =750nm, D 90 =1030nm), stir for 2.5 hours unt...

Embodiment 2

[0042] This example illustrates the positive electrode provided by the present invention, the lithium ion battery containing the positive electrode, and the preparation method thereof.

[0043] The positive electrode slurry, battery positive electrode, negative electrode slurry, battery negative electrode and battery were prepared in the same manner as in Example 1, except that the positive electrode active material contained 8 wt % of layered nickel cobalt lithium aluminate and 92 wt % of olive Lithium ion secondary battery S2 is prepared by using stone-type lithium ferrous phosphate.

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Abstract

The invention provides a battery anode, its preparation method and a lithium ion battery using the same. The battery anode includes a conductive substrate and an anode material coated on the conductive substrate. The anode material comprises an anode active material, a conductive agent and a binder. The anode active material contains, based on its total weight, 5wt%-20wt% of layered nickel cobalt lithium aluminate and 80wt%-95wt% of olivine type lithium iron phosphate. The battery anode has the advantages of high capacity and cycling stability.

Description

technical field [0001] The present invention relates to the field of lithium batteries, and in particular, the present invention relates to a positive electrode for a battery, a preparation method thereof, and a lithium ion battery using the positive electrode. Background technique [0002] As a chemical power source, lithium ion battery refers to a secondary battery composed of two compounds that can reversibly intercalate and deintercalate lithium ions as positive and negative electrodes. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode, and vice versa when discharging. [0003] As a green and high-energy battery, lithium-ion secondary battery has many advantages such as high voltage, high energy density, good cycle performance, wide operating temperature range, small self-discharge, and no memory effect, and is widely used in mobile phones, notebooks, etc. Computers, cameras and various po...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCY02E60/10
Inventor 陈娜江文锋
Owner BYD CO LTD
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