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Lithium ion battery electrode, preparation method thereof and lithium ion battery

A lithium-ion battery and electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of unguaranteed cycle performance, difficulty in infiltration of electrolytes, and uneven electrolytes.

Active Publication Date: 2013-02-13
DONGGUAN CHUANGMING BATTERY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the energy density of lithium-ion batteries, high-pressure compacted electrodes are the most direct and effective method at present, but high-pressure compaction tends to reduce the porosity inside the electrode, and even local pores disappear, resulting in difficulty in infiltration of the electrolyte, and electrolyte The separation in the electrodes is not uniform, resulting in a high internal resistance of the battery and a decrease in cycle performance. Although the energy density is improved, the cycle performance cannot be guaranteed.

Method used

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  • Lithium ion battery electrode, preparation method thereof and lithium ion battery
  • Lithium ion battery electrode, preparation method thereof and lithium ion battery
  • Lithium ion battery electrode, preparation method thereof and lithium ion battery

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preparation example Construction

[0017] The example of the present invention provides a preparation method of a lithium-ion battery electrode with uniform pore distribution and high porosity. For the process flow of the electrode preparation method for lithium ion batteries, please refer to figure 1 described, including the following steps:

[0018] S01: Prepare a slurry containing a pore-forming agent: mix the positive electrode active material or negative electrode active material with a pore-forming agent, a conductive agent, a binder, and a solvent to prepare a slurry;

[0019] S02: Drying, rolling and slitting treatment of lithium-ion battery electrodes: Coat the slurry prepared in step S01 on the current collector, and place in a multi-stage temperature-controlled continuous oven at 40-45°C, 60-65°C, 85- 90°C, 75-80°C, drying treatment at a running speed of 4-15m / min. The specific running speed is adjusted and controlled based on the complete drying of the pole piece, rolling, and cutting to obtain lit...

Embodiment 1

[0045] A kind of preparation method of lithium ion battery:

[0046] S11: First add 15g PVDF to 400g NMP and stir for 2 hours to obtain a colorless and transparent solution, then add 5g ammonium bicarbonate, continue stirring for 10 minutes, let it dissolve in the glue, then add 1000g LiCoO 2 The positive electrode active material and 15g of conductive agent acetylene black were first stirred slowly for 30 minutes, then stirred rapidly for 3 hours, and the viscosity was detected with a viscometer, and 20g NMP was added to adjust the viscosity at 8400cps; the mass percentage of solid matter was 71%;

[0047] S12: Coat the slurry prepared in step S11 on a 16 μm thick aluminum foil current collector, and continuously dry, roll, and strip at 40°C, 60°C, 85°C, and 80°C at a running speed of 8m / min. 56mm wide 18650 battery width required to obtain the lithium-ion battery positive pole piece;

[0048] S13: First add 18g CMC to 1100g pure water and stir for 2 hours to obtain a colorl...

Embodiment 2

[0052] A kind of preparation method of lithium ion battery:

[0053] S21: First add 12g PVDF to 390g NMP and stir for 2 hours to obtain a colorless and transparent solution, then add 10g ammonium bicarbonate, continue stirring for 10 minutes, let it dissolve in the glue, and then add 1000g of positive electrode active material LiCo 0.3 Ni 0.3 mn 0.3 o 2 With 10g of conductive agent acetylene black, first stir slowly for 30min, then stir rapidly for 3h, check the viscosity with a viscometer, if the viscosity is too high, add NMP to adjust, and finally adjust the viscosity of the slurry to 9300cps; the percentage of solid matter is 69.8%;

[0054] S22: Coat the slurry prepared in step S21 on a 15 μm thick aluminum foil current collector, and then dry, roll, and strip at 45°C, 60°C, 80°C, and 85°C at a running speed of 12m / min , obtaining the lithium-ion battery positive pole piece;

[0055] S23: First add 15g CMC to 950g pure water and stir for 2 hours to obtain a colorless ...

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Abstract

The invention discloses a lithium ion battery electrode, a preparation method thereof, a lithium ion battery, and a preparation method and application of the lithium ion battery. The preparation method for the electrode of the lithium ion battery comprises a step of preparing slurry containing a pore forming agent and a step of drying, rolling and slitting the electrode of the lithium ion battery. The lithium ion battery comprises the lithium ion battery electrode prepared by the preparation method for the lithium ion battery electrode. The preparation method for the lithium ion battery electrode is simple, high in efficiency and suitable for industrial production, and conditions are easy to control. Voids in the prepared lithium ion battery electrode are uniformly distributed, and a void ratio is higher than that of an ordinary electrode. The lithium ion battery has low internal resistance, high cycle performance and high energy density, so that the application range of the lithium ion battery is widened.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-ion battery electrode, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are by far the most versatile and adaptable secondary batteries. Lithium-ion batteries are involved in all electronic products ranging from mobile phones, notebooks, e-books, digital cameras, etc., to medical electronic equipment, power tools, electric bicycles, and electric vehicles. With the increasing prosperity of electronic consumer goods, the market demand for lithium-ion batteries is growing rapidly. At the same time, the performance requirements of lithium-ion batteries are getting higher and higher. The requirements for long cycle life, high energy density, and high-current cycle discharge characteristics are very prominent. Improving the high-current cycle performance of lithium-ion batteries under the premise of hi...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/62H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 程建良戴铮罗莺
Owner DONGGUAN CHUANGMING BATTERY TECH
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