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Novel power battery and preparation method thereof

A power battery and conductive agent technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of abnormal charging and discharging performance, degradation, etc.

Inactive Publication Date: 2015-07-08
JIANGSU LITIAN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the technical problem that the power battery cannot be charged and discharged normally under high rate conditions and the charge and discharge performance decreases rapidly at low temperature. By adding molybdenum ions to the components of the existing power battery, the high rate charge and discharge of the power battery is improved. Performance and low temperature stability, greatly improving the high rate charge and discharge and low temperature resistance of power batteries

Method used

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Embodiment Construction

[0008] The present invention improves the low-temperature stability of the power battery by adding molybdenum ions to the existing power battery components. The specific formula is nano-lithium iron phosphate: adhesive: conductive agent: ammonium molybdate = 89:5:5:1, The specific preparation process of the nano-lithium iron phosphate cathode material is as follows: add a binder to the solvent, first stir at a speed of 1500 rpm for 0.5 hours, then stir at a speed of 2500 rpm for 1.5 hours; add nano-phosphoric acid in stages The iron-lithium positive electrode material, ammonium molybdate and conductive agent were first stirred at a speed of 1500 rpm for 0.5 hours, and then stirred at a speed of 2500 rpm for 2.5 hours. The negative electrode material was prepared according to the general formula and method.

[0009] After the nano-lithium iron phosphate positive electrode material and negative electrode material are prepared, they are coated, rolled, formed into pole pieces, dri...

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Abstract

The invention discloses a novel power battery and a preparation method thereof. Aiming at the technical problems that the power battery cannot be normally charged and discharged under the condition of high multiplying power and the discharge performance of the power battery at a low temperature is reduced seriously, metal molybdenum ions are added into a nano lithium iron phosphate anode material so as to improve the multiplying power performance and low-temperature stability of the novel power battery and greatly improve the multiplying power performance and low-temperature resistance of the power battery. A nano lithium iron phosphate anode pole piece material is prepared by the following steps of: adding adhesive into a solvent, stirring uniformly, adding the nano lithium iron phosphate anode material, ammonium molybdate and conductive agent separately, and fully stirring, wherein a cathode pole piece material is prepared according to a common formula and a common method; then performing the processes of coating, rolling, pole piece forming, drying, lamination, lug welding, shell introduction, laser welding, drying, liquid injection, formulation, standing and grading; and finally, finishing preparation of the novel power battery. The novel power battery has reasonable formula and simple process, and can be used for scale popularization.

Description

technical field [0001] The invention relates to formula research of a power battery, in particular to a power battery and a preparation method thereof, belonging to the technical field of power batteries. technical background [0002] The global energy crisis and environmental climate are posing increasingly serious threats to human beings. Responding to the crisis, energy conservation and emission reduction, and the development of green energy and low-carbon economy are the top priorities at present. Therefore, the development of low-carbon and high-efficiency new energy has become an inevitable choice and the ultimate goal of future development to reduce fossil energy consumption and protect the human living environment. [0003] my country's existing power battery rate performance is poor, and the temperature directly affects its discharge performance. The power density (power type) of the existing domestic lithium iron phosphate power battery is between 500-1500W / Kg, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525H01M4/139H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 向玉枝杨耀新吴军陆春海马军
Owner JIANGSU LITIAN NEW ENERGY TECH