Lithium supplementing slurry for lithium ion energy storage device, and preparation method and application of lithium supplementing slurry

A lithium-ion and lithium-replenishing technology, used in electrical components, structural parts, electrochemical generators, etc., can solve the problems of difficulty in large-scale production, combustion and explosion, and high danger, and achieve improved energy density and service life, charging and discharging. Efficiency and cycle life improvement, effect of compensating for irreversible capacity loss

Pending Publication Date: 2020-02-25
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium metal powder has high activity and can indeed replenish the irreversible loss of lithium. However, lithium metal will react with oxygen and water in the air, and contact with air may cause combustion and explosion, so the risk is very high.
In addition, since metal lithium powder must be isolated from the air during the experimental operation, it is difficult to operate and not easy to scale production.

Method used

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  • Lithium supplementing slurry for lithium ion energy storage device, and preparation method and application of lithium supplementing slurry
  • Lithium supplementing slurry for lithium ion energy storage device, and preparation method and application of lithium supplementing slurry
  • Lithium supplementing slurry for lithium ion energy storage device, and preparation method and application of lithium supplementing slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of Lithium Oxalate Lithium Supplement Slurry

[0035] 1.1 In this embodiment, water is used as a solvent, lithium nickel manganese oxide (LNMO) is used as a catalyst, a copolymer of styrene and butadiene (SBR) and sodium carboxymethyl cellulose (CMC) are used as a binder, and carbon black is used as a catalyst. Conductive additives were used to prepare lithium-supplementing slurries with different lithium oxalate contents.

[0036] 1. Measure 5g of deionized water into a beaker, weigh 0.25g of CMC and add it into deionized water and stir to dissolve. At the same time, weigh 2.5g of lithium oxalate, 1g of LNMO and 1g of carbon black, grind and mix, and then add the mixture to the above solution Stir until evenly dispersed, and finally weigh 1 g of SBR (solid content: 25%) and add it into the above dispersion liquid and continue stirring until a uniform slurry is obtained, which is recorded as a1.

[0037]2. Measure 5g of deionized water into a b...

Embodiment 2

[0075] Example 2 Preparation of LiNi 0.5 mn 1.5 o 4 / Lithium oxalate positive electrode sheet

[0076] In this example, the electrode sheet supplemented with active lithium was prepared by directly adding the lithium oxalate slurry prepared in Example 1 into the positive electrode slurry.

[0077] Will LiNi 0.5 mn 1.5 o 4 (LNMO) is used as the positive electrode active material, and carbon black is used as the conductive additive at the same time, with SBR and CMC as the binder, according to the mass ratio active material: conductive additive: CMC: SBR = 92:5:1:2 in deionized water and mix evenly , prepared into a homogeneous slurry 1. Then, the corresponding volumes of a1-a9 slurries containing lithium oxalate whose mass is 10% of the mass of the LNMO used were respectively added to the slurry 1 to obtain the slurry 2. Coat the slurry 2 evenly on the aluminum foil current collector, dry it at 55°C, and cut the pole piece into a diameter of The wafers were placed in...

Embodiment 3

[0078] Example 3 Preparation of LiNi 0.5 mn 1.5 o 4 / lithium oxalate and LFP / lithium oxalate positive electrode sheet

[0079] In this example, the slurry prepared in Example 1 is applied to LiNi 0.5 mn 1.5 o 4 Or lithium iron phosphate (LFP) to obtain pole pieces supplemented by active lithium.

[0080] Will LiNi 0.5 mn 1.5 o 4 (LNMO) as positive electrode active material, carbon black as conductive additive, with SBR and CMC as binder, according to mass ratio active material: conductive additive: CMC: SBR=92:5:1:2 in deionized water and mix uniformly, Prepare a homogeneous slurry. Evenly coat the uniform positive electrode slurry on the aluminum foil current collector, dry it at 55°C, and cut the pole piece into a diameter of The wafers were placed in a vacuum oven and baked at 120°C for 6 hours. After cooling naturally, they were taken out and placed in a glove box to be used as positive electrodes (referred to as A0).

[0081] Lithium iron phosphate (LFP) is ...

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Abstract

The invention provides lithium supplementing slurry for a lithium ion energy storage device, and a preparation method and application of the lithium supplementing slurry. The lithium supplementing slurry comprises lithium oxalate serving as a lithium supplementing active substance, a transition metal compound serving as a catalyst and a solvent. The invention also provides a method for preparing the lithium supplementing slurry for the lithium ion energy storage device. The method comprises the following steps: adding lithium oxalate, a transition metal compound, an optional conductive additive and an optional binder into a solvent, and carrying out mixing to obtain the lithium supplementing slurry. The prepared slurry is used for a positive electrode of the lithium ion energy storage device, so redundant active lithium is effectively released in the first-week charging and discharging process, the irreversible capacity loss of a battery is made up, and meanwhile, the coulombic efficiency and the cycling stability of a positive electrode material are effectively improved. The lithium supplementing slurry is simple to operate, low in cost, high in safety and good in compatibility with electrolyte, and can be directly used for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium-ion energy storage devices, in particular to a lithium-supplementing slurry for lithium-ion energy storage devices and a preparation method and application thereof. Background technique [0002] With the increasingly serious problems of environmental pollution and energy shortage, the development and utilization of clean energy has become more and more urgent. Therefore, the research on green electrochemical energy storage and conversion has gradually become a hot spot in the field of energy and environment. As a high-efficiency electrical energy-chemical energy conversion device, energy storage devices have been widely used in people's daily life. Lithium-ion energy storage devices, in particular, have been widely used in various electronic devices. Lithium-ion energy storage devices are favored by electric vehicles, aerospace equipment, military equipment and other fields, and these fields have high requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M10/0525H01M10/42H01M4/13H01M4/139
CPCH01M4/364H01M4/60H01M4/13H01M4/139H01M10/4235H01M10/0525Y02E60/10
Inventor 起文斌詹元杰黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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