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Method for improving durability of lithium-ion power battery, and lithium-ion power battery

A power battery and lithium-ion technology, applied in the field of electrochemistry, can solve the problems affecting the durability of the battery, the end of the service life of the battery, and the inability to retain more electrolytes, etc., so that it is not easy to peel off or crack, the structure is complete, and the cycle performance is guaranteed. Effect

Active Publication Date: 2015-05-13
苏州悦钠新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-ion power batteries have broad application prospects in the field of new energy, such as electric vehicles, solar or wind energy or pumped storage power stations, especially in the field of electric vehicles, which require high energy density to achieve long cruising range and long service life , that is, the durability must be good in order to have economic use value, and the polymer lithium-ion power battery is found to be a lithium-ion power battery system that is easy to achieve high energy density. Because it uses aluminum-plastic film for vacuum packaging, the aluminum-plastic film is light in weight , is much lighter than steel and aluminum shells, so polymer lithium-ion power batteries are easy to achieve high energy density, but due to the use of vacuum packaging, it is impossible to store electrolyte in the space between the aluminum-plastic film shell and the battery core , because the aluminum-plastic film shell and the battery core will be tightly bonded together after vacuum packaging, and the electrolyte cannot be retained, which will affect the service life of the battery, that is, durability
In addition, due to the high energy density of the lithium-ion power battery system with high energy density, when the active material is severely short-circuited inside the battery, a large amount of heat will be generated, resulting in thermal runaway of the battery and so-called safety problems, such as combustion, explosion, etc. etc., resulting in the termination of the service life of the battery and affecting the durability of the battery

Method used

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  • Method for improving durability of lithium-ion power battery, and lithium-ion power battery

Examples

Experimental program
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Effect test

preparation example Construction

[0054] (1) Please refer to figure 1 Shown, the preparation method of negative electrode material provided by the invention comprises:

[0055] Calcining the oil-based needle coke raw material at 1300-1800°C until the pore size is 10-15%;

[0056] The calcined needle coke is mixed with liquid pitch at 100-300°C and 2-10 atmospheres for high-pressure impregnation until the pore size is 3-10%;

[0057] Graphitizing the impregnated needle coke at 3000-3800°C to obtain graphite with a pore size of 0.01-100 μm and a pore size of 50-70%;

[0058] Make the above graphite into D 10 ≥3μm, D 50 3~15μm, D 90 Graphite particles ≤20μm;

[0059] Coating the graphite particles with furan resin, bakelite resin or hard carbon;

[0060] The coated graphite particles are subjected to halogenation purification to obtain negative electrode materials.

[0061] Further, the ash content of the oil-based needle coke raw material is ≤0.16%, and the true specific gravity is 2.06-2.07g / cm 3 , the ...

Embodiment 1

[0130] To make a polymer lithium-ion power battery with a model number of 0495150 and a capacity of 7 Ah (Ah), the specific steps are as follows:

[0131] The oil-based needle coke raw material is calcined at 1300 °C, and the temperature of the raw material is about 300 °C, and the gap left after the volatile matter of the raw material is removed after calcination, such high-temperature needle coke is directly put into the vacuum autoclave for high-pressure Dipping, there is asphalt in the autoclave, after feeding such high-temperature needle coke, vacuumize, at a temperature of 100 to 300 degrees and a pressure of 2 to 10 atmospheres, the liquid asphalt penetrates into the pores of the needle coke, thereby To improve the tap density of the product. The porosity dropped from the original 10%-15% to about 3%. The resulting semi-finished product is packaged in a graphite clamp pot and subjected to graphitization treatment at 3000°C. Since the needle coke has been turned into g...

Embodiment 2

[0137] Different from Example 1, after obtaining the nano-barium sulfate slurry, mix the nano-barium sulfate slurry with 4-6 parts by weight of acrylate emulsion, foam the mixture, and adjust the foam density to 100-150 grams / L or so, use a foam spraying device to evenly spray the foam on the negative pole piece, dry the foam coating on the negative pole piece at a temperature of 60-70°C, roll it, and then bake it at 120-130°C In 3-5 minutes, a negative electrode coil with a nano-barium sulfate coating thickness of 1 to 50 microns is obtained, and then cut, soldered, taped and other sheet-making processes and processes are obtained to obtain a negative electrode sheet that can be used to make batteries.

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Abstract

The invention relates to a method for improving the durability of a lithium-ion power battery, and the lithium-ion power battery. The method comprises the following steps: conducting calcination on needle coke, and then carrying out high-pressure impregnation, graphitization treatment, pulverization for granulation, coating, and halogenation for purification to obtain an anode material capable of effectively improving the durability of the lithium-ion power battery; on the basis of the anode material, further preparing a negative pole piece and the lithium-ion power battery. The method has the advantages that the electrolyte absorptivity and the preserving capability of the anode material are improved, so that the negative pole piece made of the anode material can preserve more electrolyte; when the method is applied to a lithium-ion power battery encapsulated in a vacuum manner with an aluminum-plastic film, the defect that the quantity of preserved electrolyte is too small as the space between an aluminum-plastic film shell body and a battery core is too small can be overcome. Therefore, the aim to improve the durability of the lithium-ion power battery can be achieved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for improving the durability of a lithium-ion power battery and the lithium-ion power battery. Background technique [0002] Lithium-ion power battery refers to a secondary electrochemical system device that uses two different lithium intercalation compounds that can reversibly intercalate and extract lithium ions as the positive and negative electrodes of the battery. When charging, lithium ions are deintercalated from the positive electrode and pass through the electrolyte and diaphragm. , embedded in the negative electrode. During discharge, lithium ions are deintercalated from the negative electrode, passed through the electrolyte and separator, and inserted into the positive electrode, and the cycle can be repeated. Lithium-ion power batteries have broad application prospects in the field of new energy, such as electric vehicles, solar or wind energy or pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/62
CPCY02E60/10
Inventor 张贵萍黄子欣李振宋佑张潘毅余潘轩张金愉姚培新
Owner 苏州悦钠新能源科技有限公司
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