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Lithium ion battery positive pole piece and preparation method thereof

A lithium-ion battery, positive electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of complex technical solutions, can not solve the problem of battery over-discharge, etc., to reduce the response speed and prolong battery life , The effect of slowing down the discharge voltage

Inactive Publication Date: 2013-10-30
协鑫动力新材料(盐城)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, these methods have complex technical solutions and cannot solve the battery over-discharge problem well.

Method used

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  • Lithium ion battery positive pole piece and preparation method thereof
  • Lithium ion battery positive pole piece and preparation method thereof
  • Lithium ion battery positive pole piece and preparation method thereof

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preparation example Construction

[0034] Such as figure 1 As shown, the present invention provides a method for preparing a positive electrode sheet of a lithium ion battery, the preparation method at least includes the steps: first, after coating a lithium iron phosphate mixed slurry layer 12 on at least one surface of a current collector 11, drying Then, on the lithium iron phosphate mixed slurry layer, an active coating 13 is applied and dried to prepare the positive electrode sheet of the lithium ion battery; the material of the active coating is nickel cobalt lithium manganate, lithium manganate or One or several kinds of lithium cobalt oxides.

[0035] Specifically, first coat a layer of mixed slurry mainly composed of lithium iron phosphate material (also including binder PVDF and conductive agent SP) on one surface or the upper and lower surfaces of the current collector 11, and dry to form lithium iron phosphate Mixed slurry layer 12; then one or more of nickel-cobalt lithium manganese oxide, lithium...

Embodiment 1

[0044]Preparation of a lithium-ion battery positive electrode sheet: Lithium iron phosphate, conductive agent SP and binder polyvinylidene fluoride (PVDF) are mixed into a slurry with NMP as a solvent in a weight ratio of 91:4:5, and evenly coated Cover on the aluminum foil substrate (current collector), and form a double-layer 5u thick coating after drying. Dry mix 9.3kg lithium manganate and 0.3kg SP in advance, then add 0.4kg PVDF NMP solution and mix at room temperature to form a slurry, evenly coat on the lithium manganate coating, dry, roll, and cut into positive electrodes pole piece. A lithium battery is made from the positive pole piece, and it is measured in experiments that the lithium ion battery with the positive pole piece is discharged to 2.5V 8.7 minutes later than the existing lithium iron phosphate battery.

Embodiment 2

[0046] Preparation of a lithium-ion battery positive pole piece: Lithium iron phosphate, conductive agent SP and binder PVDF are mixed in a weight ratio of 91:4:5, and NMP is used as a solvent to form a slurry, and evenly coated on an aluminum foil substrate , formed a double-layer 5u thick coating after drying. Dry mix 9.3kg nickel-cobalt lithium manganate and 0.3kg SP in advance, then add 0.4kg PVDF NMP solution and mix at room temperature to form a slurry, which is evenly coated on the nickel-cobalt lithium manganese oxide coating, dried, and rolled. Cut into positive pole pieces. A lithium battery is made from the positive electrode sheet. Experiments have measured that the discharge of the lithium ion battery with the positive electrode sheet to 3.8V is delayed by 11.2 minutes compared with the existing lithium iron phosphate battery.

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Abstract

The invention provides a preparation method of a lithium ion battery positive pole piece (1). The preparation method at least comprises the following steps of firstly coating a lithium iron phosphate mixed stuff layer (12) on at least one surface of a current collector (11), and drying the lithium iron phosphate mixed stuff layer (12); then coating and drying an active coating (13) on the lithium ion phosphate mixed stuff layer (12) to prepare the lithium ion battery positive pole piece; the active coating is made of one or more of nickel cobalt lithium manganate, lithium manganate or lithium cobalt oxides. Under the condition that the conventional battery system is not changed, the lithium iron phosphate coating is previously coated on the positive current collector, so that the over-discharging prevention capacity of the nickel cobalt lithium manganate, the lithium manganate or the lithium cobalt oxides batteries can be improved, and the service life of the battery can be prolonged.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery positive pole piece and a preparation method thereof. Background technique [0002] Under the current energy and environmental situation in the world, electric vehicles are green vehicles that meet the requirements of energy saving and environmental protection, meet the daily travel needs of families, and have broad market prospects. Compared with other conventional batteries, lithium-ion batteries have higher driving pressure. And higher energy density, it is a more suitable choice for electric vehicles. However, when used as a power battery, it is often necessary to use lithium-ion batteries in series and parallel to achieve the voltage required by the motor. When it is connected to the load, due to the inconsistency of each battery, once a battery is in an over-discharge state, it can cause excessive deintercalation of lithium ions from the negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/131H01M4/136H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 史松君孙化雨张波
Owner 协鑫动力新材料(盐城)有限公司
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