Composite carbon cathode material for lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor high-rate charging performance, and achieve good rate charge-discharge performance, high ion conductivity, and cheap raw materials.

Inactive Publication Date: 2011-09-14
XIAMEN UNIV
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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 address the shortcomings of the existing carbon negative electrode materials that have poor high-rate charging performance, and provide a method that can reduce the impact of the SEI film on the cycle stability of the negative electrode material through a reasonable structural design, and can also partia

Method used

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  • Composite carbon cathode material for lithium ion battery and preparation method thereof
  • Composite carbon cathode material for lithium ion battery and preparation method thereof
  • Composite carbon cathode material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0031] Example 1 Preparation of MCMB / LTO core-shell composite material by sol-gel method

[0032] Add tetrabutyl titanate and MCMB to an appropriate amount of anhydrous ethanol in proportion to serve as solution A, add lithium acetate to anhydrous ethanol, add a certain amount of deionized water and glacial acetic acid as solution B, and add solution B to solution A , heated in a water bath at 50 °C and magnetically stirred for 3 h. The mixed material is spray dried. After drying, the material was placed in a nitrogen atmosphere protective furnace and heated at 800 °C for 24 h to obtain a MCMB / LTO composite material with a core-shell structure.

Example Embodiment

[0033] Example 2 Preparation of MCMB / LTO core-shell composite material by solid-phase sintering

[0034] Lithium carbonate and anatase nano-titanium dioxide were mixed in a stoichiometric ratio, a certain proportion of MCMB and an appropriate amount of acetone solvent were added, and the mixture was ball-milled for 3 hours at a speed of 300 r / min. The uniformly mixed material was vacuum dried at 80°C for 2h, put into a nitrogen atmosphere protective furnace, and heated at 800°C for 24h to obtain a MCMB / LTO composite material with a core-shell structure.

Example Embodiment

[0035] Example 3MCMB / TiO 2 Preparation of core-shell composites

[0036] The tetrabutyl titanate and MCMB were mixed in proportion, ball milled for 3h, and the rotating speed was 300r / min. The uniformly mixed material was dried by magnetic stirring in the air, and then moved to an oven at 60°C for drying for 24 hours. After drying, the material was placed in a nitrogen atmosphere protective furnace and sintered at 450 °C for 5 h to obtain MCMB / TiO with a core-shell structure. 2 composite material.

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Abstract

The invention discloses a composite carbon cathode material for a lithium ion battery and a preparation method thereof, and relates to a cathode material for a lithium ion battery. The invention provides the composite carbon cathode material for the lithium ion battery and the preparation method thereof, wherein the composite carbon cathode material can reduce the influence of a solid electrolyte interface (SEI) film on the cyclical stability of the cathode material, partially prevent anode dissolved metal ions from being deposited on the surface of the cathode material to affect the cyclical performance of the cathode material and still provide high specific energy under the condition of high charging current. The composite carbon cathode material is provided with a nuclear shell layer structure of at least three layers, wherein the outer layer is a metal layer, an alloy layer or a carbon layer; the middle layer is a lithiated metal oxide layer or a metal oxide layer; and the inner layer is a carbon material layer. The preparation method comprises the following steps of: mixing and then drying a raw material for preparing a metal oxide and a carbon material; heating and sintering the dried raw materials under the protection of atmosphere to obtain a composite material of the lithiated metal oxide or metal oxide layer with nuclear shell structure and the carbon material; and plating a metal, alloy or carbon conductive layer with reversible mechanical ductility on the surface of the composite material to obtain a product.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, in particular to a composite carbon negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, high specific energy, long life, no memory effect, and small self-discharge. They have been widely used in various portable electronic products, and have potential application markets in fields such as hybrid electric vehicles and pure electric vehicles. . At present, commercial lithium-ion batteries generally use graphite-based carbon materials as negative electrode materials. Although they have the characteristics of high material specific capacity and relatively high lithium intercalation potential, the fast charging performance of lithium-ion batteries based on carbon-based negative electrode materials is poor. It has affected a large number of applicati...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/133H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨勇陈慧鑫
Owner XIAMEN UNIV
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