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A kind of carbon/silicon/block graphite negative electrode material for lithium ion battery, preparation method and lithium ion battery

A lithium-ion battery and block graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability of lithium-ion batteries, and achieve the effects of improved cycle stability, compact structure, and designable capacity

Active Publication Date: 2017-02-22
LUOYANG YUEXING NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a carbon / silicon / block graphite negative electrode material for lithium-ion batteries, which solves the problem of poor cycle stability of lithium-ion batteries caused by the huge volume change of existing silicon negative electrode materials in the process of intercalating and removing lithium.

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  • A kind of carbon/silicon/block graphite negative electrode material for lithium ion battery, preparation method and lithium ion battery
  • A kind of carbon/silicon/block graphite negative electrode material for lithium ion battery, preparation method and lithium ion battery
  • A kind of carbon/silicon/block graphite negative electrode material for lithium ion battery, preparation method and lithium ion battery

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Embodiment 1

[0031] The lithium-ion battery carbon / silicon / block graphite negative electrode material of the present embodiment comprises a silicon / block graphite composite matrix, and the surface of the silicon / block graphite composite matrix is ​​coated with a carbon layer; the silicon / block graphite The composite matrix is ​​bulk graphite particles filled with silicon powder in the pores on the surface.

[0032] In the silicon / block graphite composite matrix, the mass percentage of silicon powder is 0.5%. The D50 of the carbon / silicon / block graphite negative electrode material is 18.43 μm, and the tap density is 1.114 g / cm 3 , the specific surface area is 1.586m 2 / g.

[0033] The preparation method of the lithium ion battery carbon / silicon / block graphite negative electrode material of the present embodiment comprises the following steps:

[0034] 1) The purity is 99.95%, the D50 is 17.5μm, and the tap density is 1.0g / cm 3 , the specific surface area is 5.5m 2 / g, massive graphite ...

Embodiment 2

[0041] The lithium-ion battery carbon / silicon / block graphite negative electrode material of the present embodiment comprises a silicon / block graphite composite matrix, and the surface of the silicon / block graphite composite matrix is ​​coated with a carbon layer; the silicon / block graphite The composite matrix is ​​bulk graphite particles filled with silicon powder in the pores on the surface.

[0042] In the silicon / block graphite composite matrix, the mass percentage of silicon powder is 0.1%. The D50 of the carbon / silicon / block graphite negative electrode material is 19.34 μm, and the tap density is 1.109 g / cm 3 , the specific surface area is 1.365m 2 / g.

[0043] The preparation method of the lithium ion battery carbon / silicon / block graphite negative electrode material of the present embodiment comprises the following steps:

[0044] 1) The purity is 99.99%, the D50 is 19.5μm, and the tap density is 1.1g / cm 3 , the specific surface area is 5.0m 2 / g, bulk graphite par...

Embodiment 3

[0048] The lithium-ion battery carbon / silicon / block graphite negative electrode material of the present embodiment comprises a silicon / block graphite composite matrix, and the surface of the silicon / block graphite composite matrix is ​​coated with a carbon layer; the silicon / block graphite The composite matrix is ​​bulk graphite particles filled with silicon powder in the pores on the surface.

[0049] In the silicon / block graphite composite matrix, the mass percentage of silicon powder is 0.5%. The D50 of the carbon / silicon / block graphite negative electrode material is 19.22 μm, and the tap density is 1.102 g / cm 3 , the specific surface area is 1.446m 2 / g.

[0050] The preparation method of the lithium ion battery carbon / silicon / block graphite negative electrode material of the present embodiment comprises the following steps:

[0051] 1) The purity is 99.98%, the D50 is 19.5μm, and the tap density is 1.1g / cm 3 , the specific surface area is 5.0m 2 / g, bulk graphite par...

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Abstract

The invention discloses a carbon / silicon / block graphite negative electrode material for lithium ion batteries, a preparation method and a lithium ion battery. The negative electrode material includes a silicon / block graphite composite matrix, and the silicon / block graphite composite matrix is ​​coated on Covered with a carbon layer; the silicon / block graphite composite matrix is ​​block graphite particles filled with silicon powder in surface holes. The carbon / silicon / block graphite negative electrode material for lithium ion batteries of the present invention improves the reversible capacity of the carbon-based material on the basis of using silicon powder to increase the capacity of the negative electrode material, and effectively buffers the silicon particles generated during charging and discharging. Huge volume change, inhibiting the volume expansion of silicon; the obtained carbon / silicon / bulk graphite anode material has the characteristics of high tap density, high reversible capacity, designable capacity, and stable cycle performance, thereby improving the electrochemical performance of lithium-ion batteries , improve its cycle stability, prolong its service life, and meet the demand for high energy density of market-oriented lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a carbon / silicon / block graphite negative electrode material for lithium ion batteries, and also relates to a preparation method and application of a carbon / silicon / block graphite negative electrode material for lithium ion batteries. The negative electrode material of lithium-ion batteries. Background technique [0002] Lithium-ion batteries are unique in the field of energy storage because of their advantages such as high working voltage, high specific energy, stable discharge, and long cycle life. They have been widely used in portable electronic devices, power tools, aerospace and other fields. As the key material of lithium-ion batteries, anode materials have always attracted people's attention. At present, although commercialized graphite-based anode materials have excellent electrochemical performance and are safe and reliable, their theoretical s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M10/0525Y02E60/10
Inventor 徐军红陈玉
Owner LUOYANG YUEXING NEW ENERGY TECH
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