Lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and battery casings, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve problems affecting cycle life, poor conductivity, hindering mass transfer, etc. Improve cycle performance and increase the effect of gram capacity

Inactive Publication Date: 2016-04-20
OPTIMUM BATTERY CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

The current conductive agents mainly include SP (carbon black conductive agent) and KS-6 (graphite conductive agent) compound. SP and KS-6 have general conductivity and poor conductivity compared with carbon nanotubes, which affects the rate performance of the battery. Moreover, the proportion of conductive agent is too large, which affects the proportion of active material in the electrode sheet, thereby affecting the capacity increase; SP is a small

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

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[0037] Example

[0038] According to the technical scheme of the present invention, a lithium battery is prepared, and the steps are as follows:

[0039] (1) Weigh the components according to 95% lithium iron phosphate, 2% carbon nanotubes, 0.5% methyl lithium, 2.5% PVDF, and at the same time weigh the NMP solvent according to the amount. The NMP weighed is the mass of four solid substances 45% of

[0040] (2) Take out PVDF and part of NMP, prepare a 10% mass fraction of glue, and disperse it for later use;

[0041] (3) Add carbon nanotubes and methyl lithium to the remaining NMP. Under vacuum conditions, the rotation frequency is 45Hz and the revolution is 40Hz for high-speed dispersion for 1h, and then ultrasonic dispersion for 30min. The ultrasonic dispersion process conditions are 15-20KHz, power 200-300W, then add lithium iron phosphate for the second high-speed dispersion for 4h;

[0042] (4) Add the glue to the dispersed slurry and mix and disperse at high speed for 2h;

[0043]...

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Abstract

The invention provides a lithium ion battery. The lithium ion battery is characterized in that a current collector of a positive plate of the lithium ion battery is coated with a paste layer, and the paste layer comprises lithium iron phosphate, carbon nanotubes, organolithium and PVDF (polyvinylidene fluoride). The invention further provides a preparation method of the lithium ion battery. The preparation method comprises the following steps that lithium iron phosphate, the carbon nanotubes, organolithium and PVDF are weighed in mass ratio, and NMP (N-methylpyrolidone) is weighed quantitatively; part of NMP is taken out, PVDF is dissolved in the part of NMP, and a glue solution is prepared; the carbon nanotubes and organolithium are added to residual NMP, the mixture is subjected to high-speed dispersion and then subjected to ultrasonic dispersion, lithium iron phosphate is added, the mixture is subjected to second high-speed dispersion, and dispersed paste is prepared; the glue solution is added to the dispersed paste for high-speed mixed dispersion, and positive electrode paste is prepared; the current collector is coated with the positive electrode paste, and the positive plate is prepared; the battery is prepared through assembly. The lithium ion battery has the advantages that exertion of capacity density of the positive electrode is integrated while the electrical conductivity of the battery is improved, the capacity of the lithium ion battery is increased, and the rate capability and the cycle performance of the lithium ion battery are enhanced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] As a new generation of green energy, power lithium-ion batteries are widely used in electric vehicles and commercial vehicles, and have won unanimous praise from customers and are becoming more and more popular among customers. Fast charging, long battery life, and long life are undoubtedly the future development direction of electric vehicles. This requires power ion batteries to have excellent rate performance and cycle performance, while having higher energy density. As a lithium-ion power battery material, lithium iron phosphate has the advantages of non-toxicity, pollution-free, good safety performance, wide source of raw materials, cheap price, etc., which is unmatched by other materials. However, in lithium-ion batteries using lithium iron phosphate as raw material, lithium iron pho...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525H01M10/058B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M4/62H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 杨国龙彭海林李瑶
Owner OPTIMUM BATTERY CO LTD
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