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Lithium supplement modification method for lithium ion positive electrode material

A cathode material, lithium ion technology, applied in the field of lithium ion cathode material supplementation and modification, can solve the problems of low safety, irreversible capacity loss, and high difficulty in operation, and achieve cost savings, high safety and reliability, and simple lithium replenishment process. Effect

Pending Publication Date: 2020-12-04
福建巨电新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this modification method, it is different from the traditional complex operation difficult and relatively low safety negative electrode lithium supplementation process, using Li 2 C 2 Sacrificial lithium salt is used as a coating material for lithium supplementary materials and conductive materials to form a core-shell structure and is coated on the surface of positive electrode materials through a relatively simple process to solve the irreversible capacity loss caused by the loss of active lithium in lithium batteries in traditional technologies

Method used

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  • Lithium supplement modification method for lithium ion positive electrode material
  • Lithium supplement modification method for lithium ion positive electrode material
  • Lithium supplement modification method for lithium ion positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 300gLi 2 C 2 and 250g absolute ethanol, Li 2 C 2 Put into absolute ethanol, keep stirring at room temperature for 12 hours, form an orange-yellow clear solution, let it stand for 3 hours, move the supernatant into another container, add 16g of Ketjen Black to it, then ultrasonically disperse for 2 hours, and keep stirring for 8 hours to ensure Ketjen Black was fully dispersed, then added 12g of PVP, and stirred for 20 hours until a stable and uniform slurry was formed (the electron microscope scanning picture is shown in figure 1 , the appearance diagram is as follows figure 2 ).

[0032] (2) Heat the slurry in (1) at 300°C in a tube furnace for 12 hours under an argon protective atmosphere.

[0033] (3) According to LiFePO 4 : Lithium supplement material: Super P: PVDF=85:8:4:3 mass ratio Weigh 500gLiFePO 4 , 47g of the lithium supplement material prepared in (1), 23.5g of Super P, 17.6g of PVDF, and 500g of NMP were used as a solvent to mix the abov...

Embodiment 2

[0039] (1) Weigh 800g Li according to the stoichiometric ratio 2 C 2 and acetone, the Li 2 C 2 Put into 900g of acetone, keep stirring at room temperature for 8 hours, form an orange liquid, let it stand for 6 hours, take out the supernatant with a pipette gun, add 36g of VGCF to it, and then ultrasonically disperse for 8 hours to fully disperse the VGCF, then add 30g of PVA, Stir for 48 hours to form a homogeneous slurry.

[0040] (2) Use the slurry described in step (1) to prepare Li 2 C 2 Positive electrode lithium supplement material.

[0041] (3) Lithium supplementation process and performance test are the same as in Example 1.

[0042] According to the above results, it can be concluded that the Li 2 C 2 As a lithium-supplementing material and a conductive material to form a core-shell structure, the coating material is added during the positive electrode pulping process. This method of lithium supplementation is not only a simpler process, but also a safer assem...

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Abstract

The invention belongs to the field of electrode materials, and particularly relates to a lithium supplement modification method for a lithium ion positive electrode material. Li2C2 is adopted as a lithium supplementing material to form a powder lithium supplementing material with a core-shell structure together with a conductive material, Li2C2 is added in the positive electrode pulping process, complex process equipment does not need to be introduced, and irreversible capacity loss caused by lithium battery active lithium loss in the traditional technology is solved on the basis of the original process. According to the method, the process is simpler, the assembly process is safer, and the first effect, the cycle performance and the energy density of the lithium battery can be improved atthe same time.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a method for modifying lithium ion positive electrode materials to supplement lithium. Background technique [0002] Lithium-ion batteries use graphite as the negative electrode. During the first charging process, about 10% of the active lithium in the positive electrode will be consumed, and an irreversible and stable SEI film will be formed on the surface of the graphite, resulting in the loss of irreversible capacity, which in turn will lead to the loss of lithium-ion battery energy. Density reduction. After research, it is found that the energy density loss caused by this part of irreversible lithium can be eliminated by the method of lithium supplementation. At present, most lithium supplementation methods are mainly negative electrode lithium supplementation. The main methods include physical mixing, chemical lithiation, electrochemical lithiation, and self-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/62H01M4/625H01M4/622H01M10/4235H01M10/0525H01M2004/028Y02E60/10
Inventor 袁鹏飞张劢魏佳骏康美玲毛云云郑先厦
Owner 福建巨电新能源股份有限公司