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Lithium ion battery silicon negative electrode material, and preparation method and application thereof

A lithium-ion battery, silicon anode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of volume expansion, affecting long-term cycle performance, etc., achieve long cycle life, improve market application prospects, and improve cycle expansion problems Effect

Pending Publication Date: 2018-03-30
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium-ion battery silicon negative electrode material and its preparation method, aiming to solve the problem that the volume expansion of the existing lithium-ion battery silicon-based negative electrode active material is serious during the cycle and affects the long-term cycle performance

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  • Lithium ion battery silicon negative electrode material, and preparation method and application thereof
  • Lithium ion battery silicon negative electrode material, and preparation method and application thereof
  • Lithium ion battery silicon negative electrode material, and preparation method and application thereof

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preparation example Construction

[0054] Correspondingly, an embodiment of the present invention provides a method for preparing a silicon negative electrode material for a lithium-ion battery, comprising the following steps:

[0055] S01. Take each component according to the formula of the above-mentioned lithium-ion battery silicon negative electrode material;

[0056] S02. Disperse binder A to form binder A glue, add conductive agent A and conductive agent B to the binder A glue, and mix to obtain conductive glue;

[0057] S03. Mix the silicon-based negative electrode active material and the graphite negative electrode active material to form a dry mix, and sequentially add the conductive glue and binder B to the dry mix to prepare a silicon negative electrode material for a lithium ion battery.

[0058] The preparation method of silicon negative electrode material for lithium ion battery provided by the embodiment of the present invention has simple process and strong operability, and is suitable for large-s...

Embodiment 1

[0079] A lithium-ion battery silicon-based negative electrode sheet, comprising a negative electrode current collector and a lithium-ion battery silicon negative electrode material deposited on the negative electrode current collector, the lithium-ion battery silicon negative electrode material includes 350g silicon-based negative electrode active material, 2150g graphite negative electrode Active material, 37.5g conductive agent and 70g binder, wherein, the conductive agent is composed of conductive agent A and conductive agent B, the conductive agent A is conductive carbon black SP, and the conductive agent B has an aspect ratio > 120 carbon nanotubes; the binder is composed of binder A and binder B, the binder A is sodium hydroxymethyl cellulose (CMC-Na), and the binder B is poly Acrylic adhesive.

[0080] The preparation method of the silicon-based negative plate of the lithium ion battery comprises the following steps:

[0081] Add 35g of sodium hydroxymethylcellulose po...

Embodiment 2

[0090] A silicon-based negative electrode sheet for a lithium ion battery, comprising a negative electrode collector and a silicon negative electrode material for a lithium ion battery deposited on the negative electrode collector, the silicon negative electrode material for a lithium ion battery includes 350g of silicon-based material silicon oxide, 2150g Artificial graphite, 37.5g conductive agent and 70g binding agent, wherein, described conductive agent is made up of conductive agent A and conductive agent B, and described conductive agent A is conductive carbon black SP and graphene, and described conductive agent B is long Carbon nanotubes with a diameter ratio>120; the binder is composed of binder A and binder B, the binder A is sodium hydroxymethyl cellulose, and the binder B is polyacrylate binder.

[0091] The preparation method of the silicon-based negative plate of the lithium ion battery comprises the following steps:

[0092] Add 35g sodium hydroxymethyl cellulo...

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Abstract

The invention provides a lithium ion battery silicon negative electrode material. The lithium ion battery silicon negative electrode material comprises a silicon-based negative electrode active material, a graphite negative electrode active material, a conductive agent and a binder, wherein the conductive agent is composed of a conductive agent A and a conductive agent B, the conductive agent A isa dot-shaped conductive agent or a planar conductive agent, and the conductive agent B is a conductive material with the length-to-diameter ratio being more than 120; and the binder is composed of abinder A and a binder B, the binder Agent A is a hydroxymethyl cellulose salt, and the binder B is a binder with the molecular structure containing a carboxyl functional group.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a silicon negative electrode material for lithium ion batteries and a preparation method and application thereof. Background technique [0002] In recent years, with the wide application and rapid development of electric vehicles, the demand for power system-power batteries has increased sharply. Lithium-ion batteries are characterized by their high capacity, high voltage, high cycle stability, high energy density, and no environmental pollution. The performance is very popular. In order for lithium-ion batteries to meet the needs of the development of electric vehicles, their energy density needs to continue to increase. Lithium-ion batteries are commonly used energy storage and conversion devices in modern life. The development of renewable energy and electric vehicles has put forward higher and higher requirements for the energy density of next-generation lith...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M4/131H01M4/133H01M4/134H01M10/0525
CPCH01M4/131H01M4/133H01M4/134H01M4/362H01M4/386H01M4/483H01M4/583H01M4/621H01M4/622H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 梁庆生易先文宋华杰孙云龙
Owner SHENZHEN BAK POWER BATTERY CO LTD
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