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Lithium ion battery

A lithium-ion battery and lithium-ion technology, applied in the direction of secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of increased internal resistance, increased electrode thickness, and weakened fast charging effect, achieving good cycle life and Effects of safety and high charging capacity

Pending Publication Date: 2022-03-18
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in battery design, the balance ratio of anode capacity to cathode capacity is greater than 1, which is more suitable for charging at lower rates. When used for high-rate fast charging, it will bring disadvantages such as increased electrode thickness, increased internal resistance, and weakened fast charging effects.

Method used

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preparation example Construction

[0038] In a specific embodiment, the present invention provides a kind of preparation method of lithium ion battery, and described preparation method comprises:

[0039] The positive pole piece, diaphragm, and negative pole piece are prepared into stacked cores by a Z-shaped lamination machine, and then the lithium-ion battery is obtained through a tab welding machine, a soft pack battery side seal, top seal, liquid injection, and pre-sealing. .

[0040] The present invention also provides a method for preparing a positive pole piece, the preparation method comprising:

[0041] Mix the positive electrode active material, conductive agent and binder, add a solvent, homogenize, coat the surface of the positive electrode current collector, and dry and roll to obtain the positive electrode sheet;

[0042] The present invention also provides a method for preparing a negative electrode sheet, the preparation method comprising:

[0043] The negative electrode active material, the c...

Embodiment 1

[0045] This embodiment provides a lithium-ion battery, the lithium-ion battery includes a positive pole piece, a negative pole piece, a separator, and an electrolyte;

[0046] The following values ​​of the positive pole piece are shown in Table 1: Ds is the lithium ion solid-phase diffusion coefficient in the positive pole piece, D50 is the median diameter of the positive active material in the positive pole piece, and CW is the positive pole piece The areal density of the middle electrode layer, PD is the compacted density of the positive pole piece, and (lnDs) 2 / (D50×CW×PD) result.

[0047] The positive electrode active material in the positive electrode sheet is NCM11, the conductive agent is carbon nanotubes, and the binder is polytetrafluoroethylene;

[0048] The negative electrode active material in the negative electrode sheet is natural graphite, the conductive agent is carbon nanowire, and the binding agent is styrene-butadiene rubber and sodium carboxymethyl cellul...

Embodiment 2

[0054] This embodiment provides a lithium ion battery, its positive electrode active material, Ds, D50, CW, PD and (lnDs) 2 / (D50×CW×PD) is also shown in Table 1.

[0055] All the other preparation methods and parameters are consistent with Example 1.

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Abstract

The invention provides a lithium ion battery. The lithium ion battery comprises a positive pole piece, a negative pole piece, a diaphragm and an electrolyte, the positive pole piece meets the condition that (lnDs) 2 / (D50 * CW * PD) is larger than 0.35 and smaller than 11.95, Ds is the solid-phase diffusion coefficient of lithium ions in the positive pole piece, D50 is the median particle size of a positive active material in the positive pole piece, CW is the surface density of an electrode layer in the positive pole piece, and PD is the compaction density of the positive pole piece. According to the invention, the relationship among the ion diffusion coefficient, the surface density and the compaction density of the positive pole piece is limited, so that the dynamics of the positive pole and the negative pole of the lithium ion battery can be optimally matched in the rapid charging process, and the lithium ion battery is ensured to have relatively high charging capacity; and meanwhile, the lithium ion battery is ensured to have very good cycle service life and safety during long-term quick charging and use.

Description

technical field [0001] The invention belongs to the technical field of batteries and relates to a lithium ion battery. Background technique [0002] Lithium-ion battery refers to a secondary battery that can repeatedly deintercalate lithium ions between the positive and negative electrodes, so it is also called "rocking chair battery". It is a new type of green energy battery successfully developed in the 21st century. Lithium-ion batteries are now mainly used in mobile phones, digital cameras, notebook computers, mobile power supplies, and electric vehicles, among which the field of electric vehicles has broad prospects for development. [0003] The current lithium-ion power battery has many advantages such as high energy density, high voltage, long cycle, long storage, no memory effect, high temperature resistance, and severe cold resistance. Generally, the structure of lithium-ion power batteries is divided into winding type and laminated type. The order of bare cells is...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/13
CPCH01M10/0525H01M4/13Y02E60/10H01M4/131H01M4/136H01M4/5825
Inventor 李明露杨红新刘静
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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