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Negative electrode material for lithium ion battery, lithium ion battery negative electrode sheet and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor thickening effect, affecting the electrochemical performance of lithium-ion batteries, and the decline of active materials

Pending Publication Date: 2017-03-29
SHENZHEN BAK POWER BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the binder composition composed of NaCMC and SBR, NaCMC is used as a thickener, and SBR is used as a binder, and the two components only undertake half of the functions. The thickening effect is not good, so use more
An increase in the content of inactive substances in the pole piece will cause a decrease in the active material in the pole piece, which will affect the electrochemical performance of the lithium-ion battery

Method used

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  • Negative electrode material for lithium ion battery, lithium ion battery negative electrode sheet and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of negative electrode sheet N1: mix natural graphite, styrene-butadiene rubber, konjac glucomannan, conductive carbon black and water according to the ratio of 99.5:0.2:0.05:0.25:120, and stir at a high speed to obtain uniform dispersion to make negative electrode slurry. The negative electrode slurry was evenly coated on both sides of the copper foil, dried, and compacted by a roller press to obtain the negative electrode sheet, which was designated as N1. The molecular weight of konjac glucomannan is 2000000Da. The molecular weight of styrene-butadiene rubber is 100000Da.

[0045] Preparation of the positive electrode sheet P1: Lithium cobaltate, polyvinylidene fluoride, conductive carbon black and N-methylpyrrolidone according to the ratio of 90:5:5:20, were uniformly dispersed by high-speed stirring to prepare the positive electrode slurry. The positive electrode slurry was evenly coated on both sides of the aluminum foil, dried and compacted by a rolle...

Embodiment 2

[0048] Preparation of negative electrode sheet N2: Mix artificial graphite, styrene-butadiene rubber, konjac glucomannan, conductive graphite and water according to the ratio of 99:0.4:0.1:0.5:110, stir at high speed to obtain uniform dispersion to make negative electrode slurry, and The negative electrode slurry is evenly coated on both sides of the copper foil, dried and compacted by a roller press to obtain the negative electrode sheet, which is recorded as N2. The molecular weight of konjac glucomannan is 1600000Da. The molecular weight of styrene-butadiene rubber is 120000Da.

[0049] Preparation of the positive electrode sheet P2: Lithium manganate, polyvinylidene fluoride, conductive carbon black and N-methylpyrrolidone according to the ratio of 92:4:4:30 were uniformly dispersed by high-speed stirring to prepare the positive electrode slurry. The positive electrode slurry was evenly coated on both sides of the aluminum foil, dried, and compacted by a roller press to o...

Embodiment 3

[0052] Preparation of negative electrode sheet N3: Mix surface-modified natural graphite, styrene-butadiene rubber, konjac glucomannan, vapor-phase grown carbon fiber and water according to the ratio of 96:1.6:0.4:2:100, and stir at a high speed to obtain uniform dispersion. Contains the negative electrode slurry, the negative electrode slurry is evenly coated on both sides of the copper foil, dried and compacted by a roller press, and the negative electrode sheet is recorded as N3. The molecular weight of konjac glucomannan is 1200000Da. The molecular weight of styrene-butadiene rubber is 140000Da.

[0053] Preparation of the positive electrode sheet P3: Lithium nickel manganese oxide, polyvinylidene fluoride, conductive carbon black and N-methylpyrrolidone according to the ratio of 94:3:3:40 were uniformly dispersed by high-speed stirring to prepare the positive electrode slurry. The positive electrode slurry was evenly coated on both sides of the aluminum foil, dried and c...

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Abstract

The invention relates to a negative electrode material for a lithium ion battery. The negative electrode material for the lithium ion battery is characterized by including a negative electrode active material, a conductive agent, a binder and a thickening agent; the thickening agent is selected from at least one of konjac glucomannan and konjac glucomannan derivatives. The thickening effect of the thickening agent in the negative electrode material of the lithium ion battery is relatively good.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium ion battery negative electrode material, a lithium ion battery negative electrode sheet and a lithium ion battery. Background technique [0002] The binder in lithium-ion batteries is mainly responsible for closely bonding the electrode active material, conductive agent and current collector in the electrode sheet. In addition to making the electrode sheet have good processability, it is more important to ensure that the electrode sheet has good processability. The battery cell can maintain its electrochemical performance for a longer period of time. For a long time, polyvinylidene fluoride (PVDF) has been the most common binder choice in the lithium battery industry, but the dissolution of PVDF requires the use of organic solvent N-methylpyrrolidone (NMP). NMP is not only expensive, but also harmful to the human body. It has certain physiological toxicity, and the random disc...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M4/133H01M4/131H01M10/0525
CPCH01M4/131H01M4/133H01M4/134H01M4/628H01M10/0525Y02E60/10
Inventor 柳青林建
Owner SHENZHEN BAK POWER BATTERY CO LTD
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