Lithium ion battery anode piece preparation method, anode piece and lithium battery

A technology of lithium ion battery and negative pole piece, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of no performance improvement, and achieve the effect of improving performance, reducing process complexity, and excellent electrochemical cycle performance.

Pending Publication Date: 2018-02-23
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

This binder-free negative electrode preparation method can simplify the process flow, but the prep

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  • Lithium ion battery anode piece preparation method, anode piece and lithium battery
  • Lithium ion battery anode piece preparation method, anode piece and lithium battery
  • Lithium ion battery anode piece preparation method, anode piece and lithium battery

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] 1. Preparation of negative electrode sheet for lithium ion battery

[0031] Lithium-ion battery negative pole pieces were prepared according to the following three groups.

[0032] First group:

[0033]

[0034] The preparation steps of lithium-ion battery negative pole piece are as follows:

[0035] S01: Preparation of precursor solution: Take lignin, polyethylene oxide and dimethylformamide according to the formula in the above table and mix them uniformly. Heat the above mixed solution to 60°C and stir for 1 hour.

[0036] S02: Add nano-silicon powder to the precursor solution obtained in S01, the mass ratio of the added nano-silicon powder to lignin is 1:1; keep the temperature constant, and continue to apply magnetic force to the mixture of the precursor solution and nano-silicon powder Stir, and change the planetary mixer every half...

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Abstract

The invention discloses a preparation method of a lithium ion battery anode piece. The preparation method comprises the following steps: S01, uniformly mixing lignin, polyoxyethylene and dimethyl formamide; S02, putting nano silicon powder into a precursor solution obtained in the step S01, maintaining constant temperature, and continuously stirring in the heating process till the viscosity of a mixture is 2000-3000cp; S03, coating an anode current collector by the precursor solution obtained in the step S02, and naturally drying in an atmosphere environment; and S04, sintering the anode current collector obtained in the step S03 in the presence of an inert atmosphere. The invention provides a preparation method for a novel carbon-covering silicon material as the lithium ion battery anodepiece, and a novel lithium ion battery anode piece and a lithium ion battery with the lithium ion battery anode piece are prepared by using the preparation method. By adopting the preparation method,the circulation property of the lithium ion battery anode piece is improved due to a nano silicon covering carbon structure, and the overall use performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of a lithium ion battery negative pole piece and a negative pole piece prepared by the preparation method, and also relates to a lithium ion battery containing the negative pole piece. Background technique [0002] Due to the advantages of high energy density, low self-discharge, and no memory effect, lithium-ion batteries have great application prospects and extensive demands in mobile electronic devices, electric vehicles, and large-scale energy storage. A lithium ion battery includes a positive pole piece and a negative pole piece, and the positive pole piece and the negative pole piece are coated with a conductive paste prepared by mixing a binder, a conductive agent, and an electrode active material in a certain ratio. In traditional technology, lithium-ion batteries mostly use graphite as the active material of the ...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1395H01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 陈涛潘启明孙鸿飞谌芳园林亮杨鹏
Owner SHENZHEN BAK POWER BATTERY CO LTD
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