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Positive pole material for lithium ion battery, positive pole for lithium ion battery and lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve problems such as poor high-temperature cycle performance, achieve long high-temperature cycle life, reduce production costs, and improve high-temperature performance.

Active Publication Date: 2012-03-28
青岛市比亚迪汽车有限公司
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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 defects of poor high-temperature cycle performance of lithium-ion batteries in the prior art, and provide a lithium-ion battery positive electrode material that further reduces the cost of the battery while ensuring high-temperature cycle performance of the battery. Lithium-ion battery cathode of cathode material and lithium-ion battery comprising the cathode

Method used

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  • Positive pole material for lithium ion battery, positive pole for lithium ion battery and lithium ion battery
  • Positive pole material for lithium ion battery, positive pole for lithium ion battery and lithium ion battery

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preparation example Construction

[0022]The preparation method of the positive electrode material of the lithium ion battery provided by the invention is simple, just by uniformly mixing various components forming the positive electrode material.

[0023] According to the positive electrode of the lithium ion battery provided by the present invention, the current collector can be various current collectors commonly used in this field, for example, it can be aluminum foil, copper foil or punched steel strip. In a specific embodiment of the present invention, aluminum foil is used as the positive electrode conductive substrate.

[0024] The positive electrode of the lithium ion battery can be prepared by first mixing and stirring the solvent, the conductive agent and the binder to form a slurry, then adding the positive electrode active material, the binder and the conductive agent to the slurry, and then stirring, drawing the slurry, Manufactured by drying, rolling and cutting. The type and amount of the solve...

Embodiment 1

[0033] This embodiment is used to illustrate the lithium ion battery positive electrode material, lithium ion battery positive electrode and lithium ion battery provided by the present invention and their preparation methods.

[0034] (1) Preparation of positive electrode

[0035] 8.8 kg of N-methylpyrrolidone (NMP), 1 kg of acetylene black and 0.2 kg of polyvinylidene fluoride (PVDF) powder were mixed and stirred for 5 minutes to prepare acetylene black slurry.

[0036] Take 2 kilograms of the above-mentioned prepared acetylene black slurry, add 3 kilograms of N-methylpyrrolidone (NMP), 9.5 kilograms of lithium cobaltate (produced by Hunan Ruixiang Company, particle diameter 8 μm), 0.5 kilograms of 311 peak relative intensity is 47.8% Lithium manganese oxide (produced by Hunan Ruixiang Company, the particle diameter is 11 μm, the XRD figure is as follows figure 1 As shown, wherein 2θ is 36.1 ° peak is 311 peak, 2θ is 18.6 ° peak is 111 peak), 0.3 kilograms of polyvinylidene ...

Embodiment 2

[0043] This embodiment is used to illustrate the lithium ion battery positive electrode material, lithium ion battery positive electrode and lithium ion battery provided by the present invention and their preparation methods.

[0044] 9.45 kg of N-methylpyrrolidone (NMP), 0.05 kg of carbon nanotubes and 0.5 kg of polytetrafluoroethylene powder were mixed and stirred for 5 minutes to prepare a carbon nanotube slurry.

[0045] Take 2 kg of the carbon nanotube slurry prepared above, add 3 kg of N-methylpyrrolidone (NMP), 9 kg of lithium cobaltate (produced by Hunan Ruixiang Company, particle diameter 14 μm), 1 kg of 311 peak relative intensity of 58.0% Lithium manganate (produced by Toda Industry, particle diameter is 19 μm, 2θ is 35.8 ° peak is 311 peak in XRD spectrogram, 2θ is 18.2 ° peak is 111 peak), 0.4 kilogram of polytetrafluoroethylene, stirring After 20 minutes, the lithium ion battery positive electrode material of the present invention is obtained. Next, prepare the ...

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Abstract

The invention provides a positive pole material for a lithium ion battery. The positive pole material comprises positive pole active substances, a conductive agent and a binding agent, wherein the positive pole active substances comprise lithium cobalt oxide and lithium manganate; and the relative intensity of a 311 peak in an XRD spectrum of the lithium manganate is less than 60 percent. The invention also provides a positive pole for the lithium ion battery by using the positive pole material and a lithium ion battery comprising the positive pole. Because the positive pole material comprises the lithium manganate of which the relative intensity of the 311 peak in the XRD spectrum of the lithium manganate is less than 60 percent, the usage amount of the lithium manganate can be up to 60 weight percent of the total weight of the positive pole active substances so as to greatly reduce the manufacturing cost of a battery and improve high-temperature performance of the battery. Simultaneously, the lithium ion battery comprising the lithium ion battery positive pole material has the advantage of long high-temperature cycle life.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material, a lithium ion battery positive electrode containing the lithium ion positive electrode material and a lithium ion battery including the lithium ion battery positive electrode. Background technique [0002] In the manufacture of lithium-ion batteries, the positive electrode active material is generally lithium cobaltate, but it is expensive and pollutes the environment. Therefore, some battery manufacturers use lithium cobaltate and lithium manganate in combination. Using lithium manganese oxide instead of a part of lithium cobalt oxide as the active material can reduce the cost of the battery and improve the safety performance of the battery, but the stability of lithium manganate under high temperature conditions is poor, resulting in poor cycle performance of the battery, so lithium manganate The amount used is generally 10-20% by weight of the total weight of the positive el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/62H01M4/02H01M10/40
CPCY02E60/12Y02E60/10
Inventor 吴长伟贾强仟雷磊
Owner 青岛市比亚迪汽车有限公司
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