Positive plate and lithium ion battery

A positive electrode sheet and positive electrode material technology, applied in the field of positive electrode sheets and lithium-ion batteries, can solve problems such as high impedance and insufficient high-temperature cycle life, and achieve suppression of decomposition reactions, improvement of cycle and impedance performance, high structural stability and oxidation resistance sexual effect

Pending Publication Date: 2022-08-09
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high impedance and insufficient high-temperature cycle life existing in existing high-nickel lithium-ion batteries, the invention provides a positive electrode sheet and a lithium-ion battery

Method used

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  • Positive plate and lithium ion battery
  • Positive plate and lithium ion battery
  • Positive plate and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0130] This embodiment is used to illustrate the lithium ion battery disclosed in the present invention and the preparation method thereof, including the following operation steps:

[0131] 1) Preparation of positive electrode sheet

[0132] Step 1: In the NMP solvent, add PVDF as a binder and the compound represented by the formula II shown in Table 2, and stir well to obtain a PVDF glue solution added with the compound represented by the formula II.

[0133] Step 2: Add the conductive agent (super P+CNT) to the PVDF glue solution and stir well.

[0134] Step 3: Continue to add the positive electrode active materials shown in Table 2, stir well, and finally obtain the required positive electrode slurry.

[0135] Step 4: Evenly coat the prepared positive electrode slurry on the positive electrode current collector (such as aluminum foil), and obtain a positive electrode sheet by drying, rolling, die-cutting or slitting. The positive electrode material layer formed on one side...

Embodiment 2～23

[0149] Examples 2 to 23 are used to illustrate the lithium ion battery disclosed in the present invention and its preparation method, including most of the operation steps in Example 1, and the differences are:

[0150] The positive electrode sheet components and electrolyte addition components shown in Table 2 were used.

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Abstract

In order to solve the problems of high impedance and short high-temperature cycle life of the existing high-nickel lithium ion battery, the invention provides a positive plate, which comprises a positive current collector and a positive material layer formed on the positive current collector, and is characterized in that the positive material layer comprises a high-nickel positive material as shown in a formula I and a compound as shown in a formula II: LiaNiqCoyMzO2, wherein a is greater than or equal to 0.9 and less than or equal to 1.2, q is greater than or equal to 0.7 and less than or equal to 1, y is greater than or equal to 0, z is greater than or equal to 0, q + y + z = 1, and M is selected from one or two of Mn and Al; the positive plate meets the following conditions: 0.05 < = (b/10) * (h/x) < = 15; 0.005 < = b < = 1, 0.7 < = x < = 1, and 80 < = h < = 140. Meanwhile, the invention also discloses a lithium ion battery comprising the positive plate. The positive plate provided by the invention can give full play to the synergistic effect between the compound as shown in the formula II and the high-nickel positive electrode material and the thickness of the positive electrode material layer, so that the high-nickel positive electrode material has relatively high structural stability and oxidation resistance, and the cycle and impedance performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage electronic parts, and particularly relates to a positive electrode sheet and a lithium ion battery. Background technique [0002] Lithium-ion batteries have rapidly occupied the consumer electronics market and expanded rapidly in the field of power storage due to their high operating voltage, low self-discharge, long cycle life, no memory effect, environmental friendliness, and good safety performance. With the application of lithium-ion batteries in electric vehicles, large-scale energy storage stations, and mobile energy storage devices, it is urgent to further improve the energy density and safety performance of lithium-ion batteries. [0003] High-nickel cathode materials have become a hotspot in research and application due to their high theoretical specific capacity compared with other cathode active materials. However, during use, the catalysis and surface effects of transition meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/525H01M10/0525
CPCH01M4/13H01M4/525H01M10/0525Y02E60/10
Inventor 钱韫娴胡时光邓永红李红梅向晓霞王勇张曌华
Owner SHENZHEN CAPCHEM TECH
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