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Lithium-ion-battery negative electrode slurry, preparing method thereof and preparing method of negative electrode plate

A lithium-ion battery and negative electrode slurry technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of poor stability of negative electrode slurry, water absorption, flocculation, etc.

Inactive Publication Date: 2015-12-30
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the poor stability of the negative electrode slurry of the lithium-ion battery prepared by the existing method, and the defects of the low yield of the negative electrode sheet and the battery, and propose a lithium-ion battery negative electrode slurry to solve the problem of negative electrode slurry. Technical problems such as water absorption and flocculation in the pulping process

Method used

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  • Lithium-ion-battery negative electrode slurry, preparing method thereof and preparing method of negative electrode plate
  • Lithium-ion-battery negative electrode slurry, preparing method thereof and preparing method of negative electrode plate

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preparation example Construction

[0020] The preparation method of lithium-ion battery negative electrode slurry comprises the steps of mixing, gelling, pulping and homogenizing, wherein any step in the steps of mixing, gelling, pulping and homogenizing is added at one time or in batches Acidic compound additive, the molecular weight of the acidic compound additive is 90-200000, the addition amount of the additive is 0.3%-3% of the weight of the negative electrode active material, the state of the acidic compound additive can be solid powder, soft gel or organic in solution.

[0021] In the above scheme, the negative electrode active material lithium-titanium composite oxide Li 4 Ti 5 o 12 The proportioning of negative electrode slurry is by weight: Li 4 Ti 5 o 12 Additives with acidic compounds: 85%-92.5%, PVDF (polyvinylidene fluoride): 3.5%-6%, conductive carbon black: 4%-9%.

[0022] A lithium-ion battery negative pole piece, the pole piece is made by coating the above-mentioned lithium-ion battery n...

Embodiment 1

[0025] Lithium titanium composite oxide Li 4 Ti 5 o 12 The proportioning of the negative electrode slurry is calculated as 100% based on the total weight of the slurry: (lithium-titanium composite oxide Li 4 Ti 5 o 12 + acidic compound additive): PVDF: conductive carbon black=85%: 6%: 9%, wherein the consumption of acidic compound additive is 0, and glue making is after adding solvent NMP (N-methylpyrrolidone) in binder PVDF , PVDF: NMP=2%: 98%, stirring and mixing for 3h under the condition of stirring frequency of 10-20Hz, pulping is adding conductive agent, lithium-titanium composite oxide Li 4 Ti 5 o 12 Afterwards, stir for 6 hours under the condition of a stirring frequency of 20-40 Hz, and further stir for 1.5 h under the condition of a stirring frequency of 10-15 Hz for the homogenate.

[0026]The ambient temperature is 25° C. and the humidity is 30% RH. The stability of the prepared negative electrode slurry is compared by testing the sieving rate of the slurry ...

Embodiment 2

[0032] Lithium titanium composite oxide Li 4 Ti 5 o 12 The proportioning of the negative electrode slurry is calculated as 100% based on the total weight of the slurry: (lithium-titanium composite oxide Li 4 Ti 5 o 12 +acidic compound additive): PVDF: conductive carbon black=85%: 6%: 9%, wherein the consumption of acidic compound additive oxalic acid is 0.3%, and the compounding is that the negative electrode active material lithium-titanium composite oxide Li 4 Ti 5 o 12 , acidic compound additive oxalic acid, and conductive agent were stirred and mixed for 1 hour under the condition of a stirring frequency of 10-20 Hz. The glue was made by adding solvent NMP to the binder PVDF, PVDF:NMP=2%:98%, and stirring Stir and mix for 3 hours under the condition of frequency 10-20Hz, pulping is to add the mixed material and stir for 6 hours under the condition of stirring frequency of 20-40Hz, homogenization is to further stir for 1.5 hours under the condition of stirring frequen...

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Abstract

The invention provides lithium-ion-battery negative electrode slurry, a preparing method thereof and a preparing method of a negative electrode plate. The lithium-ion-battery negative electrode slurry is prepared from, by weight, 85 parts to 92.5 parts of negative-electrode active substances, 3.5 parts to 6 parts of conductive agents, 4 parts to 9 parts of binding agents and 172 parts to 295 parts of solvents. The negative-electrode active substances are prepared from, by weight, 82.5 parts to 92.2 parts of lithium-titanium composite oxide and 0.26 part to 2.78 parts of acidic compound additives. By means of the lithium-ion-battery negative electrode slurry, the surface performance of material particles is improved, the reaction activation energy and the particle granularity of electrode materials are reduced, and the distribution evenness of particles in the slurry is improved; by means of the preparing method of the negative electrode slurry and the preparing method of the negative electrode plate, the prepared negative electrode slurry is good in dispersity and stability; the prepared negative electrode plate is good in softness and processing performance, the surface density and the adhesive force of the coated negative-electrode active materials are increased, and electrochemical performances such as the battery capacity use ratio and cycling performance are effectively improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium ion battery negative electrode slurry, a method for preparing the negative electrode slurry, and a method for preparing negative electrode sheets. Background technique [0002] Since the commercial application of lithium-ion batteries in the 1990s, lithium-ion secondary batteries have occupied more than 70% of the global secondary battery market. Considering the safety performance of lithium-ion batteries, it is necessary to find new negative electrode materials to replace carbon materials. Spinel-type lithium-titanium composite oxide Li 4 Ti 5 o 12 As a lithium-ion battery negative electrode material, because it has a higher potential than Li+ / Li, there is no problem of metal lithium precipitation during charging and discharging, which can greatly improve the safety performance of the battery; at the same time, spinel lithium-titanium composite oxidation The materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M4/1391
CPCY02E60/10
Inventor 常敬杭徐云军程迪皮利苹黄静韩红芳
Owner HENAN KELONG NEW ENERGY CO LTD
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