Lithium ion battery and preparation method thereof

A lithium-ion battery and current collector technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of active lithium ion loss, consumption of active lithium ions, lithium battery capacity decay, etc., and achieve Li ion concentration distribution Uniformity, improve battery consistency, improve the effect of charging and discharging efficiency

Inactive Publication Date: 2017-08-18
SUZHOU SAIFU DEBEI TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the formation of the SEI film, more than 10% of the active lithium ions will be lost, which greatly reduces the charge and discharge efficiency of the electrode material
At the same time, with the influence of other side reactions and other factors during the battery cycle, the active lithium ions will be continuously consumed, causing the capacity of the lithium battery to gradually decay until the battery fails.

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0030] (1) Weigh 985 parts by weight of Cu metal and 15 parts by weight of Li metal in proportion. The two metals are smelted at 1100°C to 1300°C, cast into ingots in a protective atmosphere, pickled and peeled to obtain a clean surface; then the ingots with clean surfaces are homogenized, and the homogenized cast The ingot was forged at high temperature and rolled into a metal foil with a thickness of 20 μm, which was used as the negative electrode collector.

[0031] (2) Take 1 part by weight of graphene (900mAh / g), 0.05 parts by weight of PVDF, and 1 part by weight of NMP, mix them evenly, and apply them on the aforementioned 20μm thick, surface area of ​​372cm 2 The surface of the Cu-Li alloy foil is dried and pressed into the negative electrode sheet for the battery.

[0032] (3) Take 6 parts by weight of positive electrode active material LiFePO4 (150mAh / g), 0.3 parts by weight of conductive carbon black, 0.2 parts by weight of PVDF, add 6.5 parts by weight of NMP, stir...

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Abstract

The invention provides a lithium ion battery and a preparation method thereof. A negative pole piece of the battery consists of a copper-lithium alloy current collector and a silicon-carbon negative material, and the negative pole piece is assembled with a membrane and a positive pole piece to form the battery. According to the battery, the capacity loss after first circulation is avoided, the utilization rate of positive active materials is improved, and the battery has excellent circulation capacity and long service life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery has been a research hotspot in the field of chemical power sources in the past 10 years. It has the excellent characteristics of high energy density, low self-discharge rate, and good cycle performance. During the first charge and discharge process of lithium-ion batteries, silicon, carbon, or silicon-carbon composite negative electrode materials react with the electrolyte at the solid-liquid phase interface to form a passivation layer covering the surface of the electrode material, that is, a solid electrolyte film. Referred to as SEI film. Due to the formation of the SEI film, more than 10% of the active lithium ions will be lost, which greatly reduces the charge-discharge efficiency of the electrode material. At the same time, with the influence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525H01M10/058
CPCH01M4/663H01M4/666H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 肖伟李红董明
Owner SUZHOU SAIFU DEBEI TRADE CO LTD
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