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Lithium ion battery negative pole pre-lithiation method and lithium ion battery

A lithium-ion battery and negative electrode technology, applied in battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve problems such as irreversible loss of capacity, and achieve the effect of improving the first discharge efficiency and battery capacity

Inactive Publication Date: 2019-03-29
HUNAN GRAND PRO ROBOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries have the characteristics of high energy density, environmental protection, and no memory effect. They have been widely used in various industries, but the requirements for battery capacity in various fields are getting higher and higher, especially in portable machines; lithium-ion batteries need to be charged at the negative electrode for the first time. A layer of SEI film is formed on the surface, causing a part of the lithium element in the positive electrode to intercalate into the negative electrode to form a lithium compound. This process is irreversible, resulting in an irreversible loss of part of the capacity.

Method used

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  • Lithium ion battery negative pole pre-lithiation method and lithium ion battery
  • Lithium ion battery negative pole pre-lithiation method and lithium ion battery

Examples

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Effect test

Embodiment 1

[0019] Get the positive electrode raw material and mix and stir evenly according to the following weight ratio, lithium cobaltate: Li 5 FeO 4 : Conductive graphite: NMP:PVDF=99.5:0.5:5:60:5; coated on aluminum foil, baked, cut to obtain a new type of positive electrode sheet; the above positive electrode sheet, graphite negative electrode sheet, and diaphragm are wound into the shell, Inject lithium hexafluorophosphate electrolyte, pre-charge at 0.02c for 5 hours, seal, and convert to volume; make 18650 2600mAh lithium-ion battery.

Embodiment 2

[0021] Get the positive electrode raw material and mix and stir evenly according to the following weight ratio, lithium cobaltate: Li 5 FeO 4 : Conductive graphite: NMP:PVDF=99.0:1.0:5:60:5; coated on aluminum foil, baked, cut to obtain a new type of positive electrode sheet; the above positive electrode sheet, graphite negative electrode sheet, and diaphragm are wound into the shell, Inject lithium hexafluorophosphate electrolyte, precharge at 0.02c for 5 hours, seal, and convert into volume; make 18650 2600mAh battery.

Embodiment 3

[0023] Get the positive electrode raw material and mix and stir evenly according to the following weight ratio, lithium cobaltate: Li 5 FeO 4 : Conductive graphite: NMP:PVDF=98.5:1.5:5:60:5; coated on aluminum foil, baked, cut to obtain a new type of positive electrode sheet; the above positive electrode sheet, graphite negative electrode sheet, and diaphragm are wound into the shell, Inject lithium hexafluorophosphate electrolyte, precharge at 0.02c for 5 hours, seal, and convert into volume; make 18650 2600mAh battery.

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a lithium ion battery negative pole pre-lithiation method and a lithium ion battery. The method is a novel method for increasing battery capacity. Before sealing, preformation is performed on a negative pole by using a lithium source Li5FeO4, so that the negative pole generates a SEI film in advance and a small amount of lithium is reserved in the negative pole, so as to improve first discharge efficiency of the battery, thereby increasing capacity.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for pre-lithiation of negative electrodes of lithium ion batteries and lithium ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, environmental protection, and no memory effect. They have been widely used in various industries, but the requirements for battery capacity in various fields are getting higher and higher, especially in portable machines; lithium-ion batteries need to be charged at the negative electrode for the first time. A layer of SEI film is formed on the surface, causing a part of the lithium element in the positive electrode to intercalate into the negative electrode to form a lithium compound. This process is irreversible, resulting in an irreversible loss of part of the capacity. Contents of the invention [0003] The invention provides a method for pre-lithiation of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/44H01M4/58
CPCH01M4/5825H01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 谢红波陈振兵蔡胜祥
Owner HUNAN GRAND PRO ROBOT TECH