Perforated positive plate of lithium ion battery, and preparation method thereof

A technology for lithium ion batteries and cathode sheets, which is applied in electrode manufacturing, battery electrodes, electrode current collector coatings, etc. High rate capability, areal density and compaction, effect of increasing wettability

Active Publication Date: 2018-08-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, it is necessary to increase the coating amount of the positive and negative electrodes, but there is still a problem in increasing the coating amount of the electrode: when the electrode is too thick, it will cause the Li of the electrode + Diffusion kinetics conditions become poor, affecting the rate and cycle performance of lithium-ion batteries

Method used

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  • Perforated positive plate of lithium ion battery, and preparation method thereof
  • Perforated positive plate of lithium ion battery, and preparation method thereof
  • Perforated positive plate of lithium ion battery, and preparation method thereof

Examples

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Embodiment 1

[0029] Such as Figure 1-3 Shown, the preparation process of the perforated positive electrode sheet of lithium-ion battery comprises the following steps:

[0030] 1) Preparation of lithium iron oxide layer slurry Weigh lithium iron oxide Li according to the ratio 5 FeO 4 , binder PAA, dispersant PVP, after uniform mixing to prepare lithium iron oxide layer slurry,

[0031] 2) Coating the lithium iron oxide layer slurry The prepared lithium iron oxide layer slurry is coated on the upper and lower surfaces of 2 μm aluminum foil to obtain a 6 μm current collector; the thickness of the lithium iron oxide layer is 2 μm;

[0032] 3) Preparation of active material layer Weigh 95 parts of NCM811; 1 part of CNT; 2 Evenly coated on the surface of the current collector;

[0033] 4) Pressing of the positive electrode sheet The current collector coated with the active material layer is rolled to obtain a positive electrode sheet with a compacted density of 3.4-3.5;

[0034] 5) Drill...

Embodiment 2

[0036] The preparation process of the perforated positive electrode sheet of lithium ion battery comprises the following steps:

[0037] 1) Preparation of lithium iron oxide layer slurry Weigh lithium iron oxide Li according to the ratio 5 FeO 4 , binder PAA, dispersant PVP, after uniform mixing to prepare lithium iron oxide layer slurry,

[0038] 2) Coating the lithium iron oxide layer slurry The prepared lithium iron oxide layer slurry is coated on the upper and lower surfaces of 40 μm aluminum foil to obtain a 50 μm current collector; the thickness of the lithium iron oxide layer is 5 μm;

[0039] 3) Preparation of active material layer Weigh 98 parts of NCM811; 0.5 part of CNT; 0.5 part of PCDF5138 by weight, and mix them uniformly to make active material layer slurry. 2 Evenly coated on the surface of the current collector;

[0040] 4) Pressing of the positive electrode sheet The current collector coated with the active material layer is rolled to obtain a positive ele...

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Abstract

The invention discloses a perforated positive plate of a lithium ion battery. The perforated positive plate comprises a current collector coated with a lithium-iron oxide layer, and active substance layers arranged on upper and lower surfaces of the current collector, wherein uniform diffusion through holes are formed on the active substance layers and the current collector. The preparation methodcomprises the following steps: firstly coating a layer of Li5FeO4 on the aluminum foil surface to provide redundant lithium source for the battery, thereby retarding the lithium ion with the negativepole first effect to form irreversible SEI film consumption and enhancing long circulation performance; secondly, increasing the energy density of the battery by using the positive electrode with high compaction and high surface density; and finally forming a perforated pole plate, wherein the electrolyte can sufficiently enter the internal of the active substance to increase the infiltration ofthe electrolyte and retarding the expansion of the active substance, and the perforated positive plate can be applied in the battery industrialization in large scale. The conventional perforated aluminum foil is obtained by coating after perforating, and the perforated positive plate is obtained by perforating after coating, so that the surface density of the active substance is higher, and the energy density of the battery is 30% higher in relative to the conventional perforated pole plate.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a perforated positive electrode sheet of a lithium ion battery and a preparation method thereof. Background technique [0002] With the continuous development of lithium-ion battery technology, we have also put forward higher requirements for the performance of lithium-ion batteries. We hope that lithium-ion batteries will be smaller, lighter, and have more energy storage. These demands are also driving lithium-ion batteries. Research work continues to advance. [0003] From the battery structure and the adoption of new materials and new systems, the method of increasing the proportion of active materials is to start from the perspective of battery production technology, first of all, to increase the proportion of active materials in the electrode. The electrode of a general lithium-ion battery is mainly composed of four major parts, active material, conductive age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/04
CPCH01M4/0404H01M4/131H01M4/1391Y02E60/10
Inventor 任森王义飞夏伦鹏曹勇蒙广伟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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