Formation method for lithium ion battery

A lithium ion battery and a chemical formation method technology, applied in the field of lithium ion battery chemical formation, can solve the problems of complex process, high energy consumption, poor stability, etc., and achieve the effects of high capacity, low energy consumption, and low expansion rate

Inactive Publication Date: 2016-08-17
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of formation method of lithium-ion battery, thus solve the existing f

Method used

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  • Formation method for lithium ion battery
  • Formation method for lithium ion battery

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Example Embodiment

[0018] Example 1

[0019] The method for forming a lithium-ion battery in this embodiment includes: charging and forming the lithium-ion battery after liquid injection and standing at a temperature of 35°C and a vacuum of 70KPa; the charging process is divided into three stages: the first The charging current in the stage is 0.05C, and the charging time is 2h; the charging current in the second stage is 0.1C, and the charging time is 2h; the charging current in the third stage is 0.25C, and the charging time is 2h.

Example Embodiment

[0020] Example 2

[0021] The method for forming a lithium-ion battery in this embodiment includes: charging and forming the lithium-ion battery after liquid injection and standing at a temperature of 45°C and a vacuum of 75KPa; the charging process is divided into two stages: the first The charging current in the first stage is 0.1C, and the charging time is 2h; the charging current in the second stage is 0.2C, and the charging time is 2h.

Example Embodiment

[0022] Example 3

[0023] The method for forming a lithium-ion battery in this embodiment includes: charging and forming the lithium-ion battery after liquid injection at a temperature of 55°C and a vacuum of 80KPa; the charging process is divided into three stages: the first The charging current in the stage is 0.05C, and the charging time is 2h; the charging current in the second stage is 0.1C, and the charging time is 2h; the charging current in the third stage is 0.25C, and the charging cut-off voltage is 3.65V.

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Abstract

The invention discloses a formation method for a lithium ion battery. The method comprises the steps of carrying out formation on the lithium ion battery, after the lithium ion battery is filled with an electrolyte and is subjected to standing, at a temperature of 35-55 DEG C by 0.01-0.5C charging current under a vacuum-pumping condition. The method adopts high-temperature negative pressure for realizing formation; the exhaust gas generated from the internal of the battery in the formation process is exhausted in time; a uniform and stable SEI film is formed on the negative electrode of the lithium ion battery at a high-temperature environment; the battery processed by the formation method has the advantages of high capacity volatilization of active materials, low internal resistance, low expansion rate, long cycle life and long storage life, so that the product quality is improved, and the service life of the battery is prolonged; and meanwhile, the method has the advantages of short formation time, high equipment utilization ratio and low energy consumption, so that the method is an efficient formation method suitable for batch production of the lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a formation method of lithium ion batteries. Background technique [0002] Lithium-ion battery, as a new type of power supply, has the characteristics of long cycle life, high energy density, high working voltage, no memory effect and environmental protection. It has been widely used in many fields, such as electronic products, electric vehicles, communication Power supply and other fields have broad application prospects, and the market demand for lithium-ion batteries is also increasing. [0003] At present, in the production process of lithium-ion batteries, formation is an important process in the production process of lithium-ion batteries. During formation, a passivation film is formed on the surface of the negative electrode, that is, solid electrolyte film (SEI). The quality of the SEI film directly affects the battery. Electrochemical propertie...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 徐文娟潘芳芳徐林孙敬
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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