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Lithium titanate composite negative electrode plate and preparation method thereof

A negative pole piece, lithium titanate technology, applied in the field of lithium ion batteries, can solve the problems affecting the rate performance, cycle performance and safety performance of the battery, insufficient performance of the gram capacity of lithium titanate, and increasing the probability of battery ignition, etc. Improved rate cycle performance, good redox activity, and improved rate performance

Pending Publication Date: 2018-01-09
OPTIMUM BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Compared with lithium ion batteries with carbon negative electrodes, lithium carbonate negative electrode lithium ion batteries have greatly improved in terms of temperature adaptability, service life and safety performance. However, the lithium titanate layer on the conventional lithium titanate negative electrode sheet is directly connected to the negative electrode collector Fluid contact, insufficient contact, large contact internal resistance, and low electron transfer speed lead to insufficient performance of lithium titanate gram capacity and low energy density of the battery; The electrolyte decomposes to generate flatulence, which affects the rate performance, cycle performance and safety performance of the battery, and the local accumulation of heat near the pole piece increases the fire probability of the battery

Method used

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  • Lithium titanate composite negative electrode plate and preparation method thereof

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preparation example Construction

[0025] The present invention also provides a method for preparing a lithium titanate composite negative pole piece, comprising the following steps:

[0026] 1) Mixed solution A is configured with aniline and HCl and the concentrations of aniline and HCl in the mixed solution A are 0.2-0.5mol / L and 0.5-1mol / L respectively; graphene is used to configure a solute mass fraction of 1-4%. Graphene suspension; use ammonium persulfate to configure ammonium persulfate solution with a concentration of 0.1-0.25mol / L;

[0027] 2) The mixed solution A of equal volume is ultrasonically mixed with the graphene suspension for a period of time and then cooled in an ice-water bath to obtain the mixed solution B;

[0028] 3) Mixing an equal volume of the mixed solution B and the ammonium persulfate solution for a period of time and then filtering to obtain a filtrate, washing and drying the filtrate to obtain a composite product;

[0029] 4) Disperse the composite product and binder obtained in...

Embodiment 1

[0034] Adopt aniline and HCl to configure mixed solution A and the concentrations of aniline and HCl in the mixed solution A are 0.5mol / L and 1mol / L respectively; adopt graphene configuration solute mass fraction to be 4% graphene suspension; adopt persulfuric acid Ammonium is used to configure ammonium persulfate solution with a concentration of 0.25mol / L.

[0035] First, an equal volume of the mixed solution A was ultrasonically mixed with the graphene suspension for 60 minutes, and then cooled in an ice-water bath at about 2° C. for 3 minutes to obtain a mixed solution B. Then react an equal volume of the mixed solution B with the ammonium persulfate solution at a temperature of 0-4° C. for 6 h and then filter to obtain the filtrate. The filtrate is washed with distilled water and methanol respectively and heated at 80° C. The composite product was obtained by vacuum drying at a temperature of 12 h.

[0036] Next, the composite product and polyvinylidene fluoride were disp...

Embodiment 2

[0038] Adopt aniline and HCl configuration mixed solution A and the concentration of aniline and HCl in the described mixed solution A is respectively 0.2mol / L, 0.5mol / L; Adopt graphene configuration solute mass fraction to be the graphene suspension of 2%; Adopt process Ammonium sulfate is used to prepare ammonium persulfate solution with a concentration of 0.1mol / L.

[0039] Firstly, an equal volume of the mixed solution A and the graphene suspension were ultrasonically mixed for 30 minutes, and then cooled in an ice-water bath at about 2° C. for 2 minutes to obtain a mixed solution B. Then react an equal volume of the mixed solution B with the ammonium persulfate solution at a temperature of 0-4° C. for 4 h and then filter to obtain the filtrate. The filtrate is washed with distilled water and methanol respectively and heated at 70° C. The composite product was obtained by vacuum drying at a temperature of 15 h.

[0040] Next, the composite product and polyvinylidene fluorid...

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Abstract

The invention provides a lithium titanate composite negative electrode plate and a preparation method thereof. The lithium titanate composite negative electrode plate comprises a negative current collector, a graphene / polyaniline layer and a lithium titanate layer, wherein the graphene / polyaniline layer and the lithium titanate layer coat the surface of the negative current collector; the graphene / polyaniline layer is located between the lithium titanate layer and the negative current collector; and the preparation method of the lithium titanate composite negative electrode plate comprises thesteps of firstly coating the surface of the negative current collector with slurry E containing graphene and aniline, drying and then forming a substrate comprising the graphene / polyaniline layer; and coating the surface of the substrate with slurry F containing lithium titanate, drying and then forming the negative electrode plate comprising the lithium titanate layer and the graphene / polyaniline layer.

Description

【Technical field】 [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium titanate composite negative pole piece and a preparation method thereof. 【Background technique】 [0002] Compared with lithium ion batteries with carbon negative electrodes, lithium carbonate negative electrode lithium ion batteries have greatly improved in terms of temperature adaptability, service life and safety performance. However, the lithium titanate layer on the conventional lithium titanate negative electrode sheet is directly connected to the negative electrode collector Fluid contact, insufficient contact, large contact internal resistance, and low electron transfer speed lead to insufficient performance of lithium titanate gram capacity and low energy density of the battery; The electrolyte decomposes to generate flatulence, which affects the rate performance, cycle performance and safety performance of the battery, and the local ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/66H01M4/1391H01M4/04H01M10/0525
CPCY02E60/10
Inventor 钟莎莎
Owner OPTIMUM BATTERY CO LTD
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