A lithium ion battery cathode material composition, cathode, battery and method

A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, battery pack components, non-aqueous electrolyte storage battery electrodes, etc., can solve the problems of shortened battery cycle life, unreported battery safety test results and high-current discharge performance, and unsatisfactory High-efficiency power battery requirements and other issues to achieve the effect of avoiding high temperature fire

Inactive Publication Date: 2008-09-10
SHENZHEN SONGDING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technical scheme disclosed by Chinese patent CN1834023A, diboron trioxide (B 2 o 3 ) and / or fumed silica (SiO 2 ) to improve the LiMn 2 o 4 The stability of the battery, after 300 cycles of charging and discharging at 1C, the capacity still maintains more than 91%, but the patent does not report the safety test results and high-current discharge performance of the battery, and the use of additives is limited to the positive electrode material
In the technical scheme described in Chinese patent CN101000971A, by adding an appropriate proportion of anti-overcharge additive cyclohexylbenzene (CHB) and flame retardant additive tri-β-chloroethyl phosphate (TCEP) in the electrolyte system, the battery is overcharged at 1C / 10V. During the charging and 150°C / 30 test, there was no fire or explosion, but due to the use of the charging additive cyclohexylbenzene (CHB) and the flame retardant additive tri-β-chloroethyl phosphate (TCEP), the cycle life of the battery was significantly shortened. After 100 cycles it has dropped below 90%
However, in the cycle life test, it can only guarantee the capacity retention rate of more than 80% under the condition of 1C charge and discharge cycles at room temperature for 300 times, and its cycle life still does not meet the requirements of high-efficiency power batteries.

Method used

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  • A lithium ion battery cathode material composition, cathode, battery and method
  • A lithium ion battery cathode material composition, cathode, battery and method
  • A lithium ion battery cathode material composition, cathode, battery and method

Examples

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preparation example Construction

[0052] According to the above description of the composition of the lithium-ion battery and the negative electrode material composition of the lithium-ion battery, the preparation method of the lithium-ion battery is specifically introduced below, and the process includes the following steps:

[0053] Step 1: Fabrication of the negative electrode sheet. According to the weight ratio, graphite, conductive agent, thickener, binder, and stabilizer are added to the solvent; the mixture is stirred, and the time, speed and temperature used for stirring are controlled to make negative electrode slurry within the expected viscosity range ; and coated on the current collector and dried; the dried pole piece is rolled into the required process thickness; according to the design requirements of the battery model, cut into the required size;

[0054] Step 2: Fabrication of the positive electrode sheet. According to the weight ratio, the active material, binder, and conductive agent are a...

Embodiment 1

[0073] Sodium carboxymethylcellulose (CMC) was dissolved in high-purity deionized water, and after stirring evenly, conductive graphite (KS15), mesophase carbon microspheres (CMB), fumed silica (SiO 2 ) and styrene-butadiene rubber (SBR), the weight composition of each component is CMB: CMC: KS15: SiO2 :SBR=93:1.5:1.5:2:2. The evenly stirred slurry was coated on a 20 μm thick copper foil current collector, vacuum-dried at 100° C., rolled, cut, and spot-welded with nickel lugs to obtain a negative electrode sheet.

[0074] The steps of preparation and liquid injection of the positive electrode sheet are the same as in Comparative Example 1.

Embodiment 2

[0076] Dissolve a certain amount of sodium carboxymethylcellulose (CMC) in high-purity deionized water, stir well, and then add conductive graphite (KS15), natural graphite (CMG) coated with mesocarbon microspheres (CMB), and Fumed silica (SiO 2 ) and styrene-butadiene rubber (SBR), the weight composition of each component is CMG: CMC: KS15: SiO 2 :SBR=90:1.5:1.5:5:2. The evenly stirred slurry was coated on a 20 μm thick copper foil current collector, vacuum-dried at 100° C., rolled, cut, and spot-welded with nickel lugs to obtain a negative electrode sheet.

[0077] The steps of preparation and liquid injection of the positive electrode sheet are the same as in Comparative Example 1.

[0078] The beneficial effects of the technical solution of the present invention will be described below through corresponding test experiments.

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Abstract

The invention discloses a negative electrode material combination for lithium-ion battery. The negative electrode material combination contains a stabilizer used for stabilizing the activity of the negative electrode material combination; the stabilizer adopts gas-phase silica dioxide and the weight ratio of the stabilizer taking up 1-10 percent of the negative electrode material combination. The invention also discloses a negative electrode of lithium-ion battery made by using the negative electrode material combination and a lithium-ion battery thereof. The negative electrode material combination of the invention can remarkably improve the stability of the lithium-ion battery thereof, thereby ensuring that the lithium-ion battery not only has good cycle charge / discharge performance and high-rate discharge performance, but also has high safety and can serve as power storage tools for power type equipment.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery negative electrode material composition, a negative electrode, a battery and a method for improving the stability of the lithium ion battery. Background technique [0002] With its advantages of high voltage, high capacity, small size, light weight, more environmental protection, long cycle life, and no memory effect, lithium-ion batteries occupy an unshakable dominant position in the portable electrical appliance market, especially with the development of materials With the update and progress of manufacturing technology, the application of lithium-ion batteries will also move from traditional digital appliances, notebook computers and mobile communication terminals to electric tools, electric bicycles, electric golf carts, electric scooters and electric vehicles. This requires that the battery not only maintains its original advantages of high specific e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/02H01M10/40H01M2/14H01M2/02H01M4/13H01M10/0525H01M50/116H01M50/40
CPCY02E60/122Y02E60/10
Inventor 杜洪彦卢舜毅赖见
Owner SHENZHEN SONGDING TECH
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