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High-specific-energy lithium battery electrode, dry preparation method thereof and lithium battery

A lithium battery, high-ratio technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode manufacturing, etc., can solve the problems of high demand for binder, reduced capacity efficiency, and high proportion of inactive materials, saving processing. Process steps, ensuring electrochemical performance, and the effect of good cycle stability

Active Publication Date: 2020-11-10
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of dispersibility provided by solvents, the conventional dry technology has higher requirements for the control amount of the binder
If the binder content is too small, delamination will occur in the pulping process, and it will be difficult to form during the coating process. At the same time, insufficient binder will cause the pole piece to fail to form a perfect three-dimensional network structure, and the electrical conductivity will decrease, resulting in such as Increased resistance, capacity decay, etc.; if the binder content is too much, it will easily lead to a high proportion of inactive materials, resulting in a decrease in mass energy density, especially in dry electrodes, because there is no dispersibility provided by the solvent, the binder The quantity requirement is high, and the excessively high binder quantity will lead to an increase in internal resistance and a decrease in capacity efficiency
In addition, because the powder needs to be directly extruded into a dry electrode film, pure powder will make thin materials difficult to process, or powder coating or laser, electrostatic and other deposition equipment will be required, which requires high process requirements and difficult manufacturing costs. reduce

Method used

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  • High-specific-energy lithium battery electrode, dry preparation method thereof and lithium battery
  • High-specific-energy lithium battery electrode, dry preparation method thereof and lithium battery
  • High-specific-energy lithium battery electrode, dry preparation method thereof and lithium battery

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preparation example Construction

[0031] The dry preparation method of the high specific energy lithium battery electrode of the present invention is used for dry preparation of lithium battery electrodes, that is, it can be used for the preparation of positive electrodes and the preparation of negative electrodes. The main preparation process is as follows: figure 1 shown, including the following steps:

[0032] Step 110, under heating conditions, uniformly mix the electrode material and the processing aid according to the mass of the processing aid accounting for 10%-80% of the total mass of the electrode material and the processing aid to form a paste mixture;

[0033] Among them, the electrode material includes: electrode active material, conductive agent, binder;

[0034] Electrode active materials include positive electrode active materials or negative electrode active materials;

[0035] The positive electrode active material includes: one or a combination of nickel-cobalt lithium manganese oxide, lith...

Embodiment 1

[0051] This embodiment provides a solvent-free dry preparation process for high specific energy lithium battery electrodes, including the following steps:

[0052] Under the condition of 60°C, artificial graphite, conductive carbon black, carbon nanofiber and styrene-butadiene rubber were simply mixed in a planetary ball mill at 2000rpm according to the mass ratio of 80:10:5:5, and 80 parts of polyvinyl carbonate ( PEC) after stirring at the same speed for 1 hour, the resulting homogeneous mixture was roll-formed under a pressure of 600 psi, and the thin material obtained by rolling was hot-pressed on a copper foil at 45° C. and a pressure of 35 psi to obtain a negative electrode sheet. The negative electrode sheet was gradually heated up to 230° C. under vacuum conditions to prepare the negative electrode sheet.

[0053] The processing aid polyethylene carbonate (PEC) used in this embodiment has an extremely low glass transition temperature (0-10° C.), which can reduce the te...

Embodiment 2

[0066] This embodiment provides a solvent-free dry preparation process for high specific energy lithium battery electrodes, including the following steps:

[0067] Under the condition of 80°C, the artificial graphite negative electrode material, conductive carbon black, carbon nanofiber and styrene-butadiene rubber are simply mixed in a planetary ball mill at 3000rpm according to the mass ratio of 72.5:15:5:7.5, and 90 parts of polyethylene carbonate are added After the ester (PEC) was stirred at the same speed for 2 hours, the resulting homogeneous mixture was roll-formed under a pressure of 800 psi, and the thin material obtained by rolling was hot-pressed on a copper foil at 45 ° C and a pressure of 35 psi to obtain a negative electrode sheet. Finally, the temperature of the negative electrode sheet was gradually raised to 230° C. under vacuum conditions to obtain the negative electrode sheet.

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Abstract

The invention relates to a high-specific-energy lithium battery electrode, a dry preparation method thereof and a lithium battery. The method comprises the following steps: under a heating condition,uniformly mixing an electrode material and a processing aid according to the mass of the processing aid accounting for 10%-80% of the total mass of the electrode material and the processing aid to form a paste mixture, wherein the electrode material comprises an electrode active substance, a conductive agent and an adhesive, the processing aid comprises one or a combination of more than one of Poly(ethylene carbonate) (PEC), Poly(propylene carbonate)(PPC), Poly(butylene carbonate)(PBC), Poly(cyclohexene carbonate) (PPC) and Poly(trimethylene carbonate) (PTMC); carrying out roll forming on thepaste mixture, and then carrying out hot pressing on a current collector to obtain an electrode plate; and carrying out heat treatment on the electrode plate under a vacuum condition to obtain the high-specific-energy lithium battery electrode.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a high-specific-energy lithium battery electrode, a dry preparation method thereof, and a lithium battery. Background technique [0002] With the rapid development of economy and technology in modern society, the performance of traditional lithium-ion batteries can no longer meet the current energy demand. The rapid development of electric vehicles, intelligent consumer electronics and other fields are in urgent need of lithium-ion batteries with higher energy density, long cycle life, low cost, and high safety. In terms of positive and negative electrodes, while the requirements for material properties are getting higher and higher, higher requirements are also put forward for the preparation process of positive and negative electrodes. [0003] At present, lithium-ion battery electrodes are prepared by coating a mixed slurry consisting of active materials, conductive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/13H01M10/0525
CPCH01M4/139H01M4/0435H01M4/0471H01M4/13H01M10/0525H01M2220/20H01M2220/30H01M2004/027H01M2004/028Y02E60/10
Inventor 桂鲁哲桂客毛泽民李泓
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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