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Preparation method of low-temperature battery

A low-temperature battery and battery performance technology, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of poor battery use, low battery energy density, high requirements for positive electrode materials and electrolytes, and achieve excellent low-temperature performance , the effect of increasing energy density

Inactive Publication Date: 2020-06-02
FIRST NEW ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of lithium-ion batteries, everyone pays more attention to the cycle life at room temperature, but batteries with excellent cycle life at room temperature are relatively poor at low temperatures.
[0003] At present, there are related low-temperature batteries, but there are generally the following two defects: First, the requirements for positive electrode materials and electrolytes are relatively high
The current low-temperature batteries require that the positive electrode material has a good rate performance, and the electrolyte must be a low-temperature electrolyte; second, the energy density of the battery produced is low. At present, most low-temperature batteries have an energy density lower than 180Wh / kg. The energy density of the low-temperature battery is only about 140Wh / kg

Method used

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  • Preparation method of low-temperature battery
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  • Preparation method of low-temperature battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The active material of nickel cobalt lithium manganese oxide, conductive carbon black (SP), carbon nanotube (CNT), polyvinylidene fluoride (PVDF) and nitrogen methyl pyrrolidone are mixed and formulated according to the ratio of 98:0.5:0.4:1.1:42 Slurry, and then the slurry is coated on the aluminum foil, through rolling, slitting, and sheeting, to make the positive electrode sheet.

[0021] The silicon carbon active material, conductive carbon black SP, carboxymethyl cellulose nano CMC thickener, polyacrylic acid binder, ethylene carbonate, and solvent water are in a ratio of 95.8:1.2:0.5:2.5:3:115 The ratio is mixed and prepared into a slurry, and then the slurry is coated on the copper foil, and the negative electrode sheet is made by rolling, cutting, and sheeting.

[0022] After the positive and negative pole pieces are ultrasonically welded to the lugs, they are separated by base film / single-sided ceramic diaphragm / double-sided ceramic diaphragm, and wound to form...

Embodiment 2

[0028] The active material of lithium cobaltate, conductive carbon black (SP), carbon nanotube (CNT) and other conductive agents, polyvinylidene fluoride (PVDF) binder and nitrogen methyl pyrrolidone according to the ratio of 97.5:0.6:0.4:1.5:45 Proportional mixing is prepared to form a slurry, and then the slurry is coated on the aluminum foil, and the positive electrode sheet is made by rolling, cutting, and sheeting.

[0029] The negative pole piece is mainly composed of hard carbon active material, conductive carbon black SP, carboxymethyl cellulose nano CMC thickener, polyacrylic binder, propylene carbonate, and solvent water in a ratio of 95.8:1.2:0.5:2.5 : 4: 100 ratio mixed to make a slurry, and then the slurry is coated on the copper foil, and the negative electrode sheet is made by rolling, cutting, and sheeting.

[0030] After the positive and negative pole pieces are ultrasonically welded to the lugs, they are separated by base film / single-sided ceramic diaphragm / d...

Embodiment 3

[0036] Mix nickel-cobalt-aluminum active material, conductive carbon black (SP), carbon nanotube (CNT), polyvinylidene fluoride (PVDF) and nitrogen methyl pyrrolidone according to the ratio of 97.5:0.6:0.4:1.5:50 to prepare slurry , and then the slurry is coated on the aluminum foil, and the positive electrode sheet is made by rolling, slitting, and sheeting.

[0037] The silicon carbon active material, conductive carbon black SP, carboxymethyl cellulose nano CMC thickener, polyacrylic binder, propylene carbonate, and solvent water are in a ratio of 95.8:1.2:0.5:2.5:4:105 The ratio is mixed and prepared into a slurry, and then the slurry is coated on the copper foil, and the negative electrode sheet is made by rolling, cutting, and sheeting.

[0038] After the positive and negative pole pieces are ultrasonically welded to the lugs, they are separated by base film / single-sided ceramic diaphragm / double-sided ceramic diaphragm, and wound to form a core; the core is placed in a 18...

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Abstract

The invention discloses a preparation method of a low-temperature battery. The method comprises the following steps: proportionally mixing a positive active substance, conductive carbon black, a carbon nanotube, a polyvinylidene fluoride binder and N-methylpyrrolidone to prepare slurry, coating the slurry on an aluminum foil, and carrying out rolling, slitting, and flaking to prepare a positive pole piece; mixing a negative electrode active material, conductive carbon black and / or carbon nanotubes, a sodium carboxymethyl cellulose thickener, a polyacrylic acid binder, ethylene carbonate or propylene carbonate and solvent water in proportion to prepare a slurry, coating a copper foil with the slurry, and carrying out rolling, slitting and flaking to prepare a negative electrode plate; and obtaining the low-temperature battery through the procedures of winding or laminating, liquid injection and the like. According to the battery, by changing the raw material ratio of the positive plateto the negative plate and adopting the polyacrylic acid binder as the negative electrode, the battery can be used in a low-temperature environment of -30 DEG C on the premise that a low-temperature electrolyte is not used, the 1C discharge capacity reaches 80% or above of the initial capacity of the battery in the environment of -30 DEG C, and the low-temperature performance is particularly excellent.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a method for preparing a low-temperature battery. Background technique [0002] With the development of the new energy industry, people have higher and higher requirements for high and low temperature performance, cycle life, energy density, and safety of batteries. In the field of lithium-ion batteries, everyone pays more attention to the cycle life at room temperature, but batteries with excellent cycle life at room temperature are relatively poor at low temperatures. [0003] At present, there are related low-temperature batteries, but there are generally the following two defects: First, the requirements for positive electrode materials and electrolytes are relatively high. The current low-temperature batteries require positive electrode materials to have good rate performance, and the electrolyte must be a low-temperature electrolyte; second, the ene...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/1391H01M4/1393H01M4/1395H01M4/04H01M10/0585H01M10/0587H01M10/0525
CPCH01M4/0404H01M4/043H01M4/1391H01M4/1393H01M4/1395H01M4/622H01M10/0525H01M10/0585H01M10/0587Y02E60/10Y02P70/50
Inventor 王改线刘小舟
Owner FIRST NEW ENERGY GRP CO LTD