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Positive plate with improved infiltration capacity and lithium ion battery

A positive electrode and capability technology, applied in the field of positive electrode and lithium ion battery, can solve the problems of affecting battery cycle life and safety, restricting battery production efficiency, slow electrolyte infiltration rate, etc. Good high-rate charge-discharge characteristics and the effect of shortening the resting time

Active Publication Date: 2019-11-26
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The power lithium-ion battery market requires high energy density, high rate, and long-life batteries. While increasing the energy density of the battery, it is necessary to take into account its rate performance, safety, and long cycle life. The electrolyte is evenly distributed in the cell. In particular, the positive electrode sheet with improved permeability has high compaction density, low porosity, and slow electrolyte infiltration rate, which restricts the production efficiency of the battery, and may even lead to lithium metal precipitation and poor kinetic performance due to poor electrolyte infiltration. At the same time, by-products will be produced on the surface of the negative electrode, which will affect the cycle life and safety of the battery

Method used

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  • Positive plate with improved infiltration capacity and lithium ion battery

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Effect test

Embodiment 1

[0033] A kind of positive electrode sheet that improves permeability, this positive electrode sheet that improves permeability comprises current collector, and the both sides of described current collector are all provided with 2 layers of active matter layers with the same thickness; The contact angle of described current collector surface is θ 0 =13°, the contact angle θ on the surface of the active material layer 1 = 13.0°, θ 2 = 10.5°.

[0034] The active material layer is composed of positive electrode main material, conductive agent and surfactant, 1-COSθ 1 =0.03, 1-COSθ 2 = 0.02.

[0035] The main material of the positive electrode is lithium iron phosphate, the conductive agent is sp, the surfactant is polyether-modified siloxane, and the binder is PVDF. According to the above formula, the addition ratio of the first active material layer is 100:3 : 0.1:4, the addition ratio of the second active material layer is 100:3:0.2:4.

[0036] The preparation meth...

Embodiment 2

[0041] A kind of positive electrode sheet that improves permeability, this positive electrode sheet that improves permeability comprises current collector, and the both sides of described current collector are all provided with 3 layers of active matter layers with the same thickness; The contact angle of described current collector surface is θ 0 =40°, the contact angle θ on the surface of the active material layer 1 = 20.0°, θ2 =16.2,°,θ 3 = 14.6.

[0042] The active material layer is composed of positive electrode main material, conductive agent and surfactant, 1-COSθ 1 =0.06, 1-COSθ 2 =0.04, 1-COS θ 3 = 0.03.

[0043] The main material of the positive electrode is NCM523, the conductive agent is sp, CNT, the surfactant is polyether-modified siloxane, and the binder PVDF. According to the above formula, the addition ratio of the first active material layer is 100: 2: 1:0.2:3.5, the addition ratio of the second active material layer is 100:2.0:1.0:0.4:4, and ...

Embodiment 3

[0049] A kind of positive electrode sheet that improves permeability, this positive electrode sheet that improves permeability comprises current collector, and the both sides of described current collector are all provided with 2 layers of active matter layers with the same thickness; The contact angle of described current collector surface is θ 0 =18°, the contact angle θ on the surface of the active material layer 1 = 18.0°, θ 2 = 14.6°.

[0050] The active material layer is composed of positive electrode main material, conductive agent and surfactant, 1-COSθ 1 =0.05, 1-COSθ 2 = 0.03.

[0051] The main material of the positive electrode is NCM523, the conductive agent is sp, CNT, the surfactant is silicone modified polyacrylate, and the binder PVDF. According to the above formula, the addition ratio of the first active material layer is 100:2:1 : 0.1: 3.5, the addition ratio of the second active material layer is 100: 2.0: 2.0: 0.4: 3.5.

[0052] The preparatio...

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Abstract

The invention provides a positive plate with improved infiltration capacity. The positive plate comprises a current collector, and n active matter layers with the same thickness are arranged on two sides of the current collector, wherein n is larger than or equal to 1 and smaller than or equal to 10; the contact angle of the surface of the current collector is theta 0, COS(theta 0) is larger thanor equal to 0.50 and smaller than 0.99, the contact angle of the surfaces of the active matter layers is theta n, and theta n is smaller than or equal to 30 degrees; when COS(theta 0) is larger than or equal to 0.50 and smaller than 0.94, theta 1 is equal to half of theta 0, and theta n is equal to the product of theta 1 and 0.9<n+1>; and when COS(theta 0) is larger than or equal to 0.94 and smaller than 0.99, theta 1 is equal to theta 0, and theta n is equal to the product of theta 1 and 0.9<n+1>. The positive plate with improved infiltration capacity obtains good plate infiltration, standingtime of a cell after the battery is injected with an electrolyte is shortened, the infiltration rate of the electrolyte for the positive plate with the improved infiltration capacity is increased, the production efficiency and yield are increased, a prepared battery electrode interface state is more uniform, and interfacial current density in the charging-discharging process is more uniform.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a positive electrode sheet and a lithium-ion battery with improved permeability. Background technique [0002] In recent years, with the popularization of new energy vehicles and 3C consumer goods on a larger scale, people have higher and higher requirements for lithium-ion batteries in terms of high energy density, high rate charge and discharge, long life, and high safety. The power lithium-ion battery market requires high energy density, high rate, and long-life batteries. While increasing the energy density of the battery, it is necessary to take into account its rate performance, safety, and long cycle life. The electrolyte is evenly distributed in the cell. In particular, the positive electrode sheet with improved permeability has high compaction density, low porosity, and slow electrolyte infiltration rate, which restricts the production efficiency of the b...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/0525
CPCH01M4/13H01M4/0404H01M4/0435H01M4/0471H01M4/139H01M10/0525Y02E60/10
Inventor 任卫强高秀玲王驰伟郭春泰
Owner TIANJIN ENERGIES
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