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Positive electrode, electrochemical device, and electronic apparatus

An electronic equipment, electrochemical technology, applied in the field of electrochemical devices and electronic equipment, positive electrode, can solve the problems of increased battery internal resistance, lower lithium ion transmission rate, higher interface impedance, etc., to increase compaction density and reduce transmission Impedance, effect of increasing contact points

Pending Publication Date: 2022-05-24
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is impossible to solve the intrinsic problems of lithium-ion batteries such as high interfacial impedance at low temperature, low lithium-ion transmission rate, and high internal resistance of the battery.

Method used

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  • Positive electrode, electrochemical device, and electronic apparatus
  • Positive electrode, electrochemical device, and electronic apparatus
  • Positive electrode, electrochemical device, and electronic apparatus

Examples

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Effect test

Embodiment 1

[0052] This embodiment provides a positive electrode, the positive electrode includes a current collector and a positive electrode active material layer disposed on the surface of the current collector, the current collector is an aluminum foil, and the positive electrode active material layer includes a positive electrode active material, a conductive agent and A binder, the mass ratio of the positive electrode active material, the conductive agent and the binder is 97:1.5:1.5.

[0053] The positive active material includes a first active material and a second active material, the first active material is lithium nickel cobalt manganate (NCM622), the particle size D50 of the first active material is 10 μm, and the average particle size of the primary particles is 0.7 μm; the second active material is lithium nickel cobalt manganate (NCM622), the particle size D50 of the second active material is 3 μm, the average particle size of the primary particles is 0.5 μm, and the mass r...

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Abstract

Provided are a positive electrode, an electrochemical device, and an electronic apparatus, the positive electrode including a positive electrode active material layer, the positive electrode active material layer including a positive electrode active material including a first active material and a second active material, and at least two types of conductive agents, the difference between the particle diameter D50 of the first active material and the particle diameter D50 of the second active material is 3 [mu] m to 15 [mu] m. The positive electrode has high lithium ion transmission efficiency, and the electrochemical device prepared from the positive electrode has high capacity retention rate at low temperature (0 DEG C and-20 DEG C).

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a positive electrode, an electrochemical device and an electronic device. Background technique [0002] With the rapid growth of the production and sales of new energy vehicles, the market occupancy rate of new energy vehicles has also achieved a rapid breakthrough. In winter, especially in high-latitude and severe cold regions, the capacity and energy retention rate of lithium-ion power batteries at low temperatures will decline rapidly, resulting in a significant reduction in the cruising range of new energy vehicles. According to reports, the average cruising range of new energy vehicles drops by 39% when the temperature is -7°C outdoors and 22°C in the car, and some vehicles without battery temperature control systems will drop by 60%. In order to improve the performance of lithium-ion battery systems at low temperatures, system thermal insulation layers, module heating shee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/364H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 李扬赵彦彪张宇尹雪
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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