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Lithium ion battery anode material and preparation method thereof, lithium ion battery anode piece 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 difficulty in meeting the needs for preparing high energy density lithium ion batteries, low specific capacity of negative electrode materials, etc., to achieve high energy density, The effect of high specific capacity and high energy density

Inactive Publication Date: 2015-03-18
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the first aspect of the embodiment of the present invention provides a lithium ion battery negative electrode material to solve the problem of Li 4 Ti 5 o 12 The specific capacity of negative electrode materials is low, and it is difficult to meet the needs of preparing high energy density lithium-ion batteries

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  • Lithium ion battery anode material and preparation method thereof, lithium ion battery anode piece and lithium ion battery
  • Lithium ion battery anode material and preparation method thereof, lithium ion battery anode piece and lithium ion battery
  • Lithium ion battery anode material and preparation method thereof, lithium ion battery anode piece and lithium ion battery

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preparation example Construction

[0037] The conductive agent may be a commonly used conductive agent for preparing lithium-ion batteries. In this embodiment, the conductive agent is graphite, carbon black or carbon fiber. The binder is polyvinylidene fluoride or epoxy resin. The organic solvents include N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), N-2-methylpyrrolidone (NMP), acetone, tetrahydrofuran (THF) and methanol one or more of them.

[0038] The anode material of a lithium ion battery provided by the first aspect of the embodiment of the present invention has high capacity, high rate performance, and stable structure, is not easy to react with the electrolyte, and does not agglomerate, so that the lithium ion battery can finally have a higher High energy density and good cycle stability.

[0039] In a second aspect, an embodiment of the present invention provides a method for preparing a negative electrode material for a lithium ion battery, comprising the following steps:

[0040] mixin...

Embodiment 1

[0056] A preparation method for a lithium ion battery negative electrode material, comprising the following steps:

[0057] Add 25.0g polyvinylidene fluoride (PVDF) to 500g N-2-methylpyrrolidone (NMP), add 25.0g conductive graphite after stirring for 4 hours, add Li 4 Ti 5 o 12 360.0g, add Fe after stirring for 4 hours 2 o 3 90.0 g, stirred for 4 hours to obtain the lithium ion battery negative electrode material. Among them, the temperature in the four stirring processes is 30° C., and the stirring speed is 2500 rpm in rotation and 30 rpm in revolution.

[0058] Preparation of Lithium-ion Battery Negative Electrode

[0059] Take the above-mentioned lithium-ion battery negative electrode material and coat it on a perforated aluminum foil with a coating weight of 6.5g / cm 2 (excluding aluminum foil), put the electrode in an oven and bake the electrode at 100-120°C, roll the baked and dried electrode sheet to obtain a negative electrode sheet with a thickness of 0.085mm, an...

Embodiment 2

[0065] A preparation method for a lithium ion battery negative electrode material, comprising the following steps:

[0066] Add 21.4g polyvinylidene fluoride (PVDF) to 500g N-2-methylpyrrolidone (NMP), add 42.9g conductive carbon black after stirring for 1 hour, add Li 4 Ti 5 o 12 162.9 g, after stirring for 1 hour, Co 3 o 4 8.6g, stirred for 3 hours to obtain the lithium ion battery negative electrode material. The temperature in the four stirring processes was 30° C., and the stirring speed was 3500 rpm for rotation and 40 rpm for revolution.

[0067] Preparation of Lithium-ion Battery Negative Electrode

[0068] Take the above-mentioned lithium-ion battery negative electrode material and coat it on a perforated aluminum foil with a coating weight of 10.8g / cm 2 (without aluminum foil), put the electrode in an oven and bake the electrode at 100-120°C, roll the baked and dried electrode sheet to obtain a negative electrode sheet with a thickness of 0.128mm, and finally c...

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Abstract

An embodiment of the present invention provides a negative electrode material of a lithium-ion battery. The negative electrode material of a lithium-ion battery comprises a negative electrode active material, a conductive agent, a bonding agent, and an organic solvent. The negative electrode active material, the conductive agent and the bonding agent account for 70% to 90%, 5% to 20% and 5% to 10% of the total mass of the negative electrode active material, the conductive agent and the bonding agent respectively. The negative electrode active material comprises Li4Ti5O12 particles and transition metal particles. The Li4Ti5O12 particles account for 50% to 95% of the total mass of the negative electrode active material. The transition metal particles comprise one or more kinds of following particles: nickel oxide particles, ferric oxide particles, ferroferric oxide particles, titanium dioxide particles, and cobaltosic oxide particles. The present invention solves the problem that the Li4Ti5O12 negative electrode material is low in specific capacity and cannot meet requirements for preparing a high-energy high-density lithium-ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode material and a preparation method thereof, a lithium ion battery negative electrode sheet and a lithium ion battery. Background technique [0002] As portable electronic devices and electric vehicles have higher and higher energy density requirements for lithium-ion batteries, the research and development of lithium-ion batteries with high energy density is becoming increasingly important. [0003] In recent years, lithium titanate (Li 4 Ti 5 o 12 ) has attracted much attention as an electrode material for lithium-ion batteries, because it has the following advantages: (1) Li 4 Ti 5 o 12 As a "zero strain" electrode material, according to the research results of S.Schamer et al. (J.of electrochemical society,146(3),1999,857,861), the cubic spinel structure of Li 4 Ti 5 o 12 During the intercalation-deintercalation process of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/48H01M4/131H01M10/0525
CPCH01M4/485H01M4/131H01M4/362H01M10/0525Y02E60/10
Inventor 张光辉
Owner HUAWEI TECH CO LTD
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