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

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increased irreversible capacity, inability to fully utilize the high capacity of silicon, and complicated preparation processes, and achieve excellent high-rate charging Discharge performance, good initial charge efficiency, and uniform particle size distribution

Active Publication Date: 2012-07-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these materials intercalate lithium, the crystal structure changes, which causes an increase in their volume. If the volume of the active material changes greatly during charge and discharge, poor contact between the active material and the current collector will occur, resulting in Lithium-ion battery charging and discharging cycle life shortening problem
In order to improve the charge-discharge cycle life of lithium-ion batteries, efforts have been made to reduce the volume expansion rate at the time of intercalation of lithium by oxidizing a part of silicon. However, if a part of silicon is oxidized, the irreversible capacity at the time of initial charge-discharge increases. , will lead to the inability to fully utilize the high capacity of silicon
[0011] CN101228652 discloses a negative electrode for a lithium ion secondary battery, which has a current collector and an active material layer attached to the current collector, wherein the The active material layer contains an active material represented by the general formula: LiaSiOx, where 0.5≤a-x≤1.1, 0.2≤x≤1.2; the active The material is obtained by vapor-depositing lithium on a layer containing an active material precursor having silicon and oxygen, and reacting the active material precursor and the lithium, but the specific capacity of this negative electrode is low, and The preparation process is complicated, the cost is high, and it is difficult to industrialize

Method used

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

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preparation example Construction

[0045] Specifically, the preparation method of the negative electrode material of the lithium ion battery provided by the invention comprises the following steps:

[0046] Step 1, mixing lithium source, M source, silicon source, and carbon source in an organic solvent to obtain a solid-liquid mixture, wherein the silicon source is a silicon source in a gel state, and the carbon source is dissolved in an organic solvent, The M source is insoluble in an organic solvent, the lithium source is selectively soluble or insoluble in an organic solvent, and the solid-liquid mixture is ball milled and dried to obtain a precursor.

[0047] In this step, aiming at the characteristics of the silicate material’s electronic conductivity and poor first coulombic efficiency, the carbon material coating is carried out. The carbon source selected for this carbon material coating must be soluble in ethanol and acetone One or more mixed carbon sources of equal polar organic solvents, for example: ...

Embodiment 1

[0069] (1) Preparation of negative electrode materials

[0070] A. Add 0.2mol LiAc·2H 2 O, 0.1mol MnCO 3 , 0.1mol Si (OC 2 h 5 ) 4 and 4.19g of glucose were added to 80g of absolute ethanol, milled with a planetary ball mill for 10 hours at a speed of 400r / min, dried and pulverized to obtain a powdery nanoscale precursor;

[0071] B. Place the precursor in a tubular resistance furnace under argon protection, heat-treat at 350°C for 4h, heat-treat at 650°C for 10h, then anneal at 500°C for 2h, and cool naturally to room temperature to obtain composite material A1. In A1, C is coated on Li 2 MnSiO 4 surface, Li 2 MnSiO 4 The content of C is 95wt%, and the content of C is 5wt%;

[0072] The FESEM (field emission scanning electron microscope) figure of the composite material prepared above was observed by JSM-6700F field emission scanning electron microscope of Japan Electronics Company, see figure 2 , it is observed that the particle size distribution of the composite ...

Embodiment 2

[0079] Composite materials, button batteries and full batteries were prepared in the same manner as in Example 1, except that the raw material added was 0.2mol LiAc 2H 2 O, 0.1mol ferrous oxalate, 0.1mol Si (OC 2 h 5 ) 4 and 4.19g of glucose were added to 80g of absolute ethanol to prepare carbon material coated Li 2 FeSiO 4 Composite material A2, where Li 2 FeSiO 4 The content of C is 94wt%, and the content of C is 6wt%, and the CR2016 coin cell C2 is obtained.

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Abstract

The invention provides a lithium ion battery anode material, which comprises a silicate material and a carbon material, wherein the content of the silicate material is 85 wt percent to 97 wt percent, and the content of the carbon material is 3 wt percent to 15 wt percent; and the structural formula of the silicate material is Li2MSiO4, and M is selected from Mn, Fe and Mn(1-x)Fe(x), wherein x is more than 0 and less than 1. Furthermore, the invention also provides a preparation method for the anode material and a lithium ion battery adopting the anode material. The process of the preparation method of the invention is simple; and the prepared anode material has high performance and a stable structure, is applied to the lithium ion battery, has high initial charging efficiency and relatively high specific capacity, and can bear high-rate charge and discharge.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, more specifically, to a negative electrode material of a lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-metal hydride batteries, it has the advantages of high voltage, long life and high energy density. Therefore, since Japan's Sony Corporation launched the first generation of lithium-ion batteries in 1990, it has developed rapidly and is widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. The preferred companion power supply for power supplies. In lithium-ion batteries, positive electrode materials and negative electrode materials are key materials that determine the performance of lithium-ion batteries, and are also hot and difficult points in the research of existing...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 胡栋杰袁学远
Owner BYD CO LTD
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