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 amorphous carbon with large specific surface area, high activity, shedding, and material pulverization

Active Publication Date: 2015-03-18
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

However, it undergoes serious volume expansion and contraction during the process of intercalation and delithiation, and the volume expansion rate is >300%, which causes the powdering and shedding of the material during the charge and discharge process, resulting in the decline of cycle performance.
[0003] In order to improve its cycle performance, the current preparation method is to disperse silicon-based materials into other inactive materials to form a uniform composite material. The inactive m

Method used

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

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Embodiment 1

[0022] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:

[0023] (1) Mix aluminum powder and silicon oxide, wherein the particle size of aluminum powder is 5 μm, and the particle size of silicon oxide is 75 μm to obtain a mixture, which includes silicon oxide and aluminum powder, wherein silicon oxide The mass ratio to aluminum powder is 1.2:1. When the mass ratio of the silicon oxide to the aluminum is 1.2:1, the aluminum can fully reduce the active oxygen in the finally prepared lithium ion negative electrode material and improve the first charge and discharge efficiency of the lithium ion negative electrode material.

[0024] (2) Put the mixture obtained in step (1) into a high-temperature furnace with an inert atmosphere, raise the temperature to 900°C at a heating rate of 6°C / min, and burn for 6 hours to obtain the negative electrode material for lithium-ion batteries.

[0025] When silicon ...

Embodiment 2

[0031] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:

[0032] (1) Mix the aluminum powder and silicon oxide, wherein the particle size of the aluminum powder is 10 μm, and the particle size of the silicon oxide is 30 μm, and put it into a planetary ball mill at a speed of 300 rpm for 8 hours to obtain a mixture. In the mixture It includes silicon oxide and aluminum powder, wherein the mass ratio of silicon oxide to aluminum powder is 1.7:1. When the mass ratio of the silicon oxide to the aluminum is 1.7:1, the aluminum can fully reduce the active oxygen in the finally prepared lithium ion negative electrode material, and improve the first-time efficiency of charge and discharge of the lithium ion negative electrode material .

[0033] (2) Put the mixture obtained in step (1) into a high-temperature furnace under vacuum conditions, raise the temperature to 1000°C at a heating rate of 4°C / min, a...

Embodiment 3

[0036] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:

[0037](1) Mix the aluminum powder and silicon oxide, wherein the particle size of the aluminum powder is 1 μm, and the particle size of the silicon oxide is 5 μm, and put it into a planetary ball mill at a speed of 500 rpm for 4 hours to obtain a mixture. It includes silicon oxide and aluminum powder, wherein the mass ratio of silicon oxide to aluminum powder is 2.2:1. When the mass ratio of the silicon oxide to the aluminum is 2.2:1, the aluminum can fully reduce the active oxygen in the finally prepared lithium ion negative electrode material, and improve the first-time efficiency of charge and discharge of the lithium ion negative electrode material .

[0038] (2) Put the mixture obtained in step (1) into a high-temperature furnace with an inert atmosphere. The first stage: heat up from room temperature to 710°C at a heating rate of 5°C...

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Abstract

The invention discloses a lithium ion battery anode material and a preparation method thereof, and a lithium ion battery. The preparation method comprises the following steps: (1) mixing aluminum and silicon (II) oxide to obtain a mixture, wherein the mass of silicon (II) oxide is greater than that of aluminum; and (2) firing the mixture under an inert atmosphere or vacuum condition at the temperature of 900-1150 DEG C for 2-12h to obtain the lithium ion battery anode material. According to the preparation method, the raw material aluminum is added in the raw material silicon (II) oxide, due to reaction of the raw material aluminum and silicon (II) oxide, the content of active oxygen in the anode material obtained finally is reduced, and the prepared anode material further comprises aluminum oxide. The content of the active oxygen in the anode material is reduced, the charge-discharge first-time efficiency of the anode material is greatly improved, the specific capacity of the anode material is greatly increased; meanwhile, aluminum oxide in the anode material can be used for relieving the volume expansion of silicon in the anode material, so that the volume effect of the whole anode material is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the rapid development of electronic equipment, the requirements for miniaturization, multi-functionalization and high performance of batteries are constantly increasing. In addition, the capacity of the current commercial negative electrode material graphite is close to 372mAh / g. In order to seek a higher specific energy For negative electrode materials with higher capacity, people are turning their attention to metals that can electrochemically alloy with lithium, such as silicon, tin, and aluminum with higher specific capacity. The theoretical specific capacity of lithium intercalation and desorption of this type of negative electrode material is much greater than that of graphite, and the theoretical lithium in...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/38H01M4/386H01M4/48H01M4/62H01M10/0525Y02E60/10
Inventor 赵志刚曾绍忠王秀田阴山慧
Owner CHERY AUTOMOBILE CO LTD
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