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Cylindrical lithium ion battery used for high-capacity electric tool and preparation method thereof

A technology for lithium-ion batteries and electric tools, which is applied to secondary batteries, battery electrodes, and secondary battery charging/discharging, etc. It can solve the problems of shortening discharge time, affecting battery life, and reducing battery discharge platforms, and achieves improved safety performance. , Reduce the polarization phenomenon, improve the effect of service life

Inactive Publication Date: 2016-12-21
江苏海四达电源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still some problems in the use of ternary lithium-ion batteries, for example: 1) Some lithium-ion batteries have a problem of high internal resistance, and the internal resistance of lithium-ion batteries has a great impact on the performance of electric tool batteries. High resistance, a large amount of Joule heat will be generated in a high current environment, resulting in a lower battery discharge platform and shortened discharge time, seriously affecting battery life
2) In the field of electric tool batteries, the adapted batteries need to have instantaneous high power, which has high requirements for the high-current discharge performance of the battery. Under the condition of high-current discharge, the internal temperature of the battery will rise rapidly, and even a short circuit will occur in severe cases. There are security risks
3) Ordinary ternary lithium-ion batteries, under the condition of high-current charge-discharge cycle, the internal polarization of the battery increases, irreversible capacity is continuously generated, and the service life continues to decay

Method used

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  • Cylindrical lithium ion battery used for high-capacity electric tool and preparation method thereof
  • Cylindrical lithium ion battery used for high-capacity electric tool and preparation method thereof
  • Cylindrical lithium ion battery used for high-capacity electric tool and preparation method thereof

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preparation example Construction

[0021] The invention provides a method for preparing a cylindrical lithium-ion battery for high-capacity electric tools, comprising:

[0022] 1) The conductive agent Super P, KS-6, positive electrode active material, binder PVDF (glue), NMP are stirred at high speed, screened, and finally applied on the front and back of the aluminum foil and dried, rolled, slitting, and made sheet to obtain the positive sheet;

[0023] 2) Stir the conductive agent Super P, negative electrode active material, binder (including CMC and SBR), and deionized water at high speed, and finally apply it on the front and back of the copper foil and dry, roll, slitting, and sheeting to get the negative plate;

[0024] 3) Baking the positive electrode sheet and the negative electrode sheet, winding, shelling, rolling, baking, injecting electrolyte and sealing to obtain an assembled battery;

[0025] 4) forming the assembled battery to obtain a cylindrical lithium-ion battery for high-capacity electric ...

preparation example 1

[0038] Preparation of positive electrode active material:

[0039] Mix Li salt, Mg salt, Ni salt, Co salt, and Mn salt in a ratio of 10:0.5:5:2:3, add oxalic acid, mix and ultrasonically 10min, dry the above dispersion, and then calcinate at 500°C for 5h. The heating rate is 5°C / min, and then calcined at 900°C for 7h, the heating rate is 8°C / min, and the primary product is obtained, and the above product is ground, and Zn salt is added, and the molar ratio of Zn salt to primary product is 1:50. The above mixture was dispersed in ethylene glycol, ultrasonicated for 20 minutes, dried and then calcined at 400°C for 4 hours at a heating rate of 4°C / min, then at 700°C for 6 hours at a heating rate of 7°C / min. The calcined product is pulverized to obtain Mg 2+ Doped ZnO-coated modified three raw materials.

preparation example 2

[0041] Preparation of negative electrode active material:

[0042] Weigh and mix pyrrole and artificial graphite, the molar ratio of pyrrole and graphite is 1:75, add to 100mL of 0.1mol / L hydrochloric acid after mixing, sonicate at 10°C for 10min, then add 1mol / L FeCl 3 , reacted at 5° C. for 15 h under stirring conditions, vacuum filtered, washed with water, and dried to obtain protonic acid-doped polypyrrole-coated artificial graphite.

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Abstract

The invention discloses a cylindrical lithium ion battery used for a high-capacity electric tool and a preparation method thereof. The preparation method comprises the following steps: (1) stirring a conductive agent Super P, KS-6, a positive active material, a binder PVDF and NMP at a high speed, smearing the mixture on the front and back surfaces of an aluminum foil, drying, grinding, stripping, and flaking to obtain a positive plate; (2) stirring the conductive agent Super P, a negative active material, a binder and deionized water at a high speed, and finally, smearing the mixture on the front and back surfaces of the aluminum foil, drying, grinding, stripping and flaking to obtain a negative plate; (3) roasting the positive plate and the negative plate, winding, injecting electrolyte and sealing to obtain an assembly battery; and (4) forming. The cylindrical lithium ion battery for the high-capacity electric tool prepared by the method has the characteristics of excellent inner resistance, rate capability, rapid charging performance, high-current cycling performance and safety.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a cylindrical lithium-ion battery for high-capacity electric tools and a preparation method thereof. Background technique [0002] Batteries for electric tools mainly include nickel-based batteries and lithium-ion batteries. However, nickel-cadmium batteries have defects such as high pollution and storage failure during use. Compared with nickel-based batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, short charging time, and no memory effect. Therefore, lithium-ion batteries are widely used in the field of power tools. At present, the commercial lithium-ion battery cathode materials generally use materials such as lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt lithium manganese oxide. Among them, the cost of lithium manganese oxide is relatively low, but because of its unstable material, its high tempe...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0587H01M4/36H01M4/505H01M4/525H01M4/587H01M4/62H01M10/44
CPCH01M4/366H01M4/505H01M4/525H01M4/587H01M4/62H01M4/624H01M4/628H01M10/0525H01M10/0587H01M10/446Y02E60/10Y02P70/50
Inventor 沈晓彦吴金燕周建新王兴威唐琛明
Owner 江苏海四达电源有限公司
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