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High-power lithium ion battery and preparation method thereof

A lithium-ion battery and high-power technology, applied in the field of lithium-ion batteries, can solve the problems of high DC internal resistance, poor power performance, and inability to meet the performance requirements of fast charging and high pulse power of lithium-ion batteries, so as to improve power performance , low surface density, fast charging and high pulse power

Pending Publication Date: 2022-01-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing high-power lithium-ion batteries have high DC internal resistance and poor power performance, which cannot meet the performance requirements of fast charging and high pulse power of lithium-ion batteries

Method used

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  • High-power lithium ion battery and preparation method thereof
  • High-power lithium ion battery and preparation method thereof
  • High-power lithium ion battery and preparation method thereof

Examples

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preparation example Construction

[0045] The second aspect of the present invention discloses a method for preparing a high-power lithium-ion battery as described in the first aspect of the present invention. The preparation process can adopt the conventional preparation process in the field, that is, first obtain the positive electrode sheet and the negative electrode sheet respectively. , diaphragm and electrolyte, and then battery assembly, in one or more embodiments of the present invention, it specifically includes the following steps:

[0046] Coating the positive electrode slurry on the surface of the positive electrode current collector and drying to obtain the positive electrode sheet;

[0047] Coating the negative electrode slurry on the surface of the negative electrode current collector and drying to obtain the negative electrode sheet;

[0048] The positive electrode sheet and the negative electrode sheet are rolled and cut, and then the separator is placed between the positive electrode sheet and...

Embodiment 1

[0054] A high-power lithium-ion battery is disclosed in this embodiment, which includes a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte, a casing, and a top cover. The specific preparation method is as follows:

[0055] Preparation of the positive electrode sheet: in parts by mass, first add 1 part of polyvinylidene fluoride to N-methylpyrrolidone and stir for 5 hours to obtain a polyvinylidene fluoride solution with a solid content of 6.8%, under the condition of a vacuum of 0.1 MPa Vacuum stand defoaming for 2 hours; then add 2.0 parts of conductive carbon black and 1.5 parts of carbon nanotubes and stir at low speed for 1 hour to obtain a mixed solution with a solid content of 7.83%; then add 94.5 parts of nickel-cobalt lithium manganate and stir for 4 hours at high speed, Finally, N-methylpyrrolidone is added to adjust the viscosity to obtain a positive electrode slurry with a viscosity of 3980 mPa·s and a solid content of 59.7%. The posi...

Embodiment 2

[0060] A high-power lithium-ion battery is disclosed in this embodiment, which includes a positive electrode sheet, a negative electrode sheet, a diaphragm, an electrolyte, a casing, and a top cover. The specific preparation method is as follows:

[0061] Preparation of the positive electrode sheet: in parts by mass, first add 2 parts of polyvinylidene fluoride to N-methylpyrrolidone and stir for 5 hours to obtain a polyvinylidene fluoride solution with a solid content of 6.8%. Under the condition of a vacuum of 0.1MPa Vacuum static defoaming 2h, then add 2.0 parts of conductive carbon black and 1.0 parts of carbon nanotubes and stir at low speed for 1h to obtain a mixed solution with a solid content of 7.83%, then add 95 parts of nickel cobalt lithium manganate and stir at high speed for 4 hours, Finally, add N-methylpyrrolidone to adjust the viscosity to obtain a positive electrode slurry with a viscosity of 3980 mPa·s and a solid content of 54.8%. The positive electrode slur...

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Abstract

The invention discloses a high-power lithium ion battery and a preparation method thereof, and the high-power lithium ion battery comprises a positive electrode plate, wherein the single-side surface density of the positive electrode plate is 70-90g / m <2>, and the average compaction density is 3.0-3.1 g / cm <3>; a negative electrode plate, wherein the surface density of a single surface of the negative plate is 35-45 g / m <2>, and the average compaction density of the negative plate is 1.2-1.4 g / cm <3>; a diaphragm which is arranged between the positive plate and the negative plate; and an electrolyte solution. According to the high-power lithium ion battery, through design of specific surface density and compaction, the transmission path of the lithium ion battery in the positive plate and the negative plate is effectively shortened, the ion diffusion rate is increased, and the power performance of the lithium ion battery is improved, so the performance requirements of fast charging and high pulse power of the lithium ion battery are met.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-power lithium ion battery and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, with the intensification of the environmental climate, more and more countries have begun to upgrade new energy vehicles to the national strategic level. With the popularization of large-scale new energy vehicles, lithium-ion power batteries have increasingly shown their Huge advantages, high power density, high energy density, no pollution to the environment, no memory effect, etc., are widely used in power batteries, portable electronic devices and other fields, based on future market development trends and policy environments, in some specific devices In fact, the power performance required by the battery is getting higher and higher, in order to meet some scenarios such as rail transit, shipping, and vehicle micro-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M4/13
CPCH01M10/0525H01M10/058H01M4/13Y02E60/10Y02P70/50
Inventor 陈道明刘宏强张纬阳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY