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Lithium ion battery cathode plate and lithium ion battery

A technology of lithium ion battery and positive electrode sheet, which is applied in the direction of electrode carrier/current collector, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of reduced volume energy density, poor battery cycle performance, and high volume energy density, Achieve the effect of shortening the diffusion distance, increasing the volume energy density, and high energy volume density

Inactive Publication Date: 2018-11-16
SHENZHEN UTILITY POWER SOURCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a lithium-ion battery positive plate with high volume energy density, low stress and long cycle, aiming to solve the problem of poor cycle performance and low volume energy density of existing lithium-ion battery positive plates with high-density positive materials. Lowering the problem

Method used

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  • Lithium ion battery cathode plate and lithium ion battery
  • Lithium ion battery cathode plate and lithium ion battery
  • Lithium ion battery cathode plate and lithium ion battery

Examples

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Embodiment 1

[0041] The lithium-ion battery cathode sheet that embodiment 1 provides is as figure 1 shown. Among them, 26 is the active stripe unit of the first low-porosity positive electrode material, and 27 is the active stripe unit of the second high-porosity positive electrode material.

[0042] The cross-sectional view after assembling the positive electrode sheet prepared in Example 1 into a battery is shown in figure 2 As shown, wherein, 10 is a positive electrode current collector, 20 is a positive electrode material layer (including interlaced but not mixed material stripe units), 30 is a separator, 40 is a negative electrode active material layer, and 50 is a negative electrode current collector.

Embodiment 2

[0044] The lithium-ion battery cathode sheet that embodiment 2 provides is as figure 1 shown. Among them, 26 is an active stripe unit of positive electrode material with the same porosity, which does not contain additives, and 27 is an active stripe unit of positive electrode material with the same porosity, which contains additives.

[0045] The cross-sectional view after assembling the positive electrode sheet prepared in Example 2 into a battery is shown in figure 2 As shown, wherein, 10 is a positive electrode current collector, 20 is a positive electrode material layer (including interlaced but not mixed material stripe units), 30 is a separator, 40 is a negative electrode active material layer, and 50 is a negative electrode current collector.

Embodiment 3

[0047] The lithium-ion battery cathode sheet that embodiment 3 provides is as figure 1 shown. Among them, 26 is the active stripe unit of positive electrode material with the same porosity, which contains 2% additive, and 27 is the active stripe unit of positive electrode material with the same porosity, which contains 4% additive.

[0048] The cross-sectional view after assembling the positive electrode sheet prepared in Example 3 into a battery is shown in figure 2 As shown, wherein, 10 is a positive electrode current collector, 20 is a positive electrode material layer (including interlaced but not mixed material stripe units), 30 is a separator, 40 is a negative electrode active material layer, and 50 is a negative electrode current collector.

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Abstract

The invention provides a lithium ion battery cathode plate. The lithium ion battery cathode plate comprises a current collector and a cathode material layer deposited on the surface of the current collector; the cathode material layer comprises a number of cathode material stripe units; the adjacent cathode material stripe units are contacted in a conductive manner; and in the adjacent cathode material stripe units, the types and / or contents of the cathode active materials and / or additives are different, wherein the additives are additives with foaming function.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery positive plate and a lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. The basic structure of a lithium-ion battery includes a positive electrode sheet, a negative electrode sheet, and a separator, and the main constituent materials include electrolyte, separator material, positive and negative electrode materials, and t...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M10/0525H01M10/42
CPCH01M4/70H01M10/0525H01M10/42Y02E60/10
Inventor 钟国兵孟亚斌王继生
Owner SHENZHEN UTILITY POWER SOURCE CO LTD
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