Cathode material of lithium ion battery and battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery consistency, easy heating, and failure of small-capacity batteries

Active Publication Date: 2012-06-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the compatibility of the above-mentioned conductive polymer with the binder and solvent is not high, the construction performance of the slurry is not good, and the thickness of the coated pole piece is uneven, resulting in poor consistency of the prepared batch batteries. Power tools such as electric vehicles use a large number of batteries connected in series and parallel to provide power. The performance of the battery pack is definitely not the algebraic sum of the performance of a single battery.
Small differences between batteries, even slight differences, will cause differences in the capacity, internal resistance and other characteristics of each battery unit, so that the battery with a large capacity will always be in a state of shallow charge and discharge with a small current, while the battery with a small capacity will always be in a state of shallow charging and shallow discharge. In the state of high current overcharge and overdischarge, the difference in performance parameters between the two is getting bigger and bigger, and the one with small capacity will fail early; or the one with large internal resistance will become an energy-consuming series resistor, which is prone to overheating and shortens the life.
During the use of the battery pack, the temperature, voltage, and current of each battery unit are different. After working for a period of time, the consistency of the battery pack will definitely continue to deteriorate, and finally the energy efficiency of the battery will be rapidly reduced to an unacceptable level. Level

Method used

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  • Cathode material of lithium ion battery and battery
  • Cathode material of lithium ion battery and battery

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preparation example Construction

[0017] The preparation method of the positive electrode can adopt various methods commonly used in the art. For example, the positive electrode active material, the binder and the conductive agent are prepared into a positive electrode material slurry with a solvent. The amount of the solvent added is well known to those skilled in the art and can be based on the positive electrode slurry. The viscosity and operability requirements of the slurry coating can be adjusted. Then the prepared positive electrode material slurry is drawn and coated on a current collector (any current collector known in the art, such as aluminum foil), dried and pressed, and then cut to form a lithium ion battery positive electrode. The drying temperature can be selected in the range of 90 to 150°C, and the drying time can be 10 to 40 minutes.

[0018] The solvent can be various solvents known in the art, preferably water, N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF), N,N-dimethylacetamide ( O...

Embodiment 1

[0024] Add 4ml of 3-carboxypyrrole into a three-necked flask containing 150mL of distilled water. Under mechanical stirring, add the iron p-toluenesulfonate solution at a ratio of 1:1 to the amount of 3-carboxypyrrole and iron p-toluenesulfonate hexahydrate. As an oxidant and dopant, polymerize at 0°C for 6h under the protection of Ar gas, wash the filtered powder with distilled water and anhydrous alcohol 3 times each, and vacuum dry at 60°C for 24h to obtain poly(3-carboxy)pyrrole powder .

Embodiment 2

[0026] Add 134g of iron p-toluenesulfonate hexahydrate to the 1mol / L HCl solution at room temperature, stir, add 68.6g of 2-sulfonic acid aniline to the above solution, continue the reaction for 6h, stand still, filter with suction, and filter the obtained The powder was washed with distilled water and anhydrous alcohol three times each, and dried in vacuum at 60° C. for 24 hours to obtain poly(2-sulfonic acid) aniline powder.

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Abstract

The invention provides a cathode material of a lithium ion battery. The cathode material contains active substance and conductive agent, wherein the conductive agent comprises a first conductive agent and a second conductive agent; the first conductive agent is a conductive polymer containing polar groups, and the second conductive agent is one or more selected from carbon black, graphite, carbon fiber, carbon nanotube, nickel carbonyl powder, copper powder, iron powder, zinc powder and aluminium powder. The invention also provides a lithium ion battery. During a slurry preparation process, polar groups facilitate hydrogen bond formation on the second conductive agent and the anode active substance surface and enhance disperse degree of the second conductive agent and the anode active substance in a solvent, so that the slurry is more easily coated, and the coating thickness is uniform; and the prepared polar sheet has good consistency.

Description

Technical field [0001] The invention relates to a lithium ion battery cathode material and a battery using the cathode material. Background technique [0002] Lithium-ion batteries have the characteristics of high discharge voltage, high energy density, and long cycle life. Therefore, they are widely used in the field of portable electronic devices and are favored by high-tech applications such as military, aerospace, and electric vehicles. [0003] The main performance indicators of lithium-ion batteries include battery capacity and cycle performance. The quality of battery performance depends on the electrode material. A traditional lithium battery is composed of a positive electrode, a negative electrode, a separator and an electrolyte. The lithium ion battery cathode material contains a cathode active material, a conductive agent and a binder. In the preparation process of traditional lithium ion battery electrodes, a certain amount of conductive agents such as carbon black a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/60H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 程耀波江文锋
Owner BYD CO LTD
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