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Lithium ion battery and anode and preparation method thereof

A technology for lithium-ion batteries and anode sheets, applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., to achieve the effect of simple process and elimination of deformation problems

Active Publication Date: 2014-04-09
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objectives of the present invention is to provide a lithium-ion battery anode sheet that is simple to operate and has no influence on the electrochemical performance of the battery cell, which can solve the problem of cell deformation

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of anode sheet:

[0052] Take 0.575kg EC, dry mix it with 1.916kg FSNC graphite at 60°C for 2h, then add 40gSBR, 24g CMC, 20g Super-P and 2.4kg water respectively, stir evenly at 60°C, then coat and keep the coating machine The head temperature is 60°C and the oven temperature is 110°C constant; the coated membrane is placed in an environment of 0°C for 4 hours, and after the membrane is cooled and the EC is completely solidified, it is cold-pressed at 0°C to prepare An anode coated membrane with EC coated on the surface of graphite particles was obtained (the mass ratio of EC to graphite was 30%).

[0053] Preparation of cathode sheet:

[0054] Lithium cobalt oxide (LiCoO 2 ) is a cathode active material, and its weight content is 96%; with polyvinylidene fluoride (PVDF) as a binding agent, its weight content is 2%; with carbon black as a conductive agent, its weight content is 2%; the above-mentioned materials Add it into N-methylpyrrolidone (NMP) and s...

Embodiment 2

[0060] Different from Example 1 is the preparation of the anode sheet and the preparation of the electrolyte, wherein the preparation of the anode sheet is:

[0061] Be graphite by each component distribution ratio: SBR: CMC: Super-P=95.8: 2.4: 0.8: 1.0 relation weighing material, after stirring at 45 ℃, obtain the anode slurry 2kg that solid content is 48%; Weigh 0.183kgEC, add to the anode slurry, continue to stir at constant temperature until the components are evenly mixed, keep the temperature of the coating machine head at 45°C, and the oven temperature at 90°C for coating, and the coating weight is 160mg / 1540.25mm 2 , and then put the diaphragm at 20°C for 6 hours. After the diaphragm was cooled and the EC was completely solidified, it was cold-pressed at 20°C to obtain an anode sheet with a thickness of 128 μm after cold pressing ((the mass of EC and graphite Ratio is 20%))), the structural representation of the anode sheet is as figure 2 As shown, the anode sheet in...

Embodiment 3

[0069] Different from Example 1 is the preparation of the anode sheet and the preparation of the electrolyte, wherein the preparation of the anode sheet is:

[0070] Take 0.005kg of EC, 1.916kg of graphite, 40g of SBR, 24g of CMC, 20g of Super-P and 2.4kg of water, stir evenly at 40°C and then coat and keep the temperature of the coating machine head at 40°C and the temperature of the oven at 60°C Constant; place the coated membrane in a 30°C environment for 10 hours, and then cold press it at 30°C after the membrane is cooled and the EC is completely solidified to prepare an anode sheet coated with EC on the surface of graphite particles (The mass of EC is 0.26% of the total mass of graphite).

[0071] Electrolyte preparation:

[0072] Mix ethylene carbonate (EC), propylene carbonate (PC) and dimethyl carbonate (DMC) according to the mass ratio of 29.74:30:40 to obtain a mixed solvent, and then add lithium hexafluorophosphate (LiPF 6 ), so that LiPF 6 The concentration is ...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to an anode of a lithium ion battery. The anode of the lithium ion battery comprises an anode current collector and an anode film coated on the anode current collector, and the anode film comprises anode active material, adhesive and conductive additive. The surface of the anode active material is coated with ethylene carbonate (EC), and the weight ratio of the EC and the anode active material is (0.1-30):(99.9-70). Compared with the prior art, the EC coated on the surface of the anode active material is dissolved in electrolyte after liquid injection, the space occupied by the EC in the film can be released, so that a certain space is reserved for expansion of particles of the anode active material during charging and circulating, and the problem of deformation of flexibly-packaged cell due to expansion of the active material is eliminated. Further, the invention further discloses a method for preparing the lithium ion battery, namely the lithium ion battery comprising the anode.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an anode sheet of a lithium ion battery, a preparation method thereof, and a lithium ion battery containing the anode sheet. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes in the field of lithium-ion batteries; And a lot of use on other portable electrical appliances. Lithium-ion batteries have many advantages, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, etc. It is an ideal power source for mobile appliances and electric vehicles in the 21st century. Power supply and storage device for energy storage power station. [0003] According to the classification of packaging materials, the existing lithium-ion batteries can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/62H01M4/13
CPCY02E60/122Y02E60/10
Inventor 游从辉李白清宋学文江辉方宏新张柏清
Owner NINGDE AMPEREX TECH
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