Formation method and preparation method of high-voltage lithium ion battery as well as battery

A technology of lithium ion battery and formation method, applied in the field of lithium ion battery, can solve the problems of increased SEI film growth thickness, long battery production cycle, increased battery internal resistance, etc., to achieve easy industrial application, reduce impedance, and prolong cycle life Effect

Active Publication Date: 2015-04-29
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this is not suitable for high-voltage lithium-ion batteries. Long-term low current will cause excessive lithium ions to participate in the chemical reaction of SEI film formation, resulting in increased SEI film growth thickness, increased battery internal resistance, and long-term low current high voltage. The electrolyte is decomposed seriously, and the battery production cycle is long

Method used

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  • Formation method and preparation method of high-voltage lithium ion battery as well as battery
  • Formation method and preparation method of high-voltage lithium ion battery as well as battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, LiNi 0.5 mn 1.5 o 4 As the positive electrode material, the positive electrode material LiNi 0.5 mn 1.5 o 4 , Conductive agent acetylene black, binder polyvinylidene fluoride (PVDF) according to the mass ratio of 93:2:5 ingredients, to make the positive plate; artificial graphite as the negative material, the negative material artificial graphite, conductive agent acetylene black, water-based The adhesive LA132 is mixed according to the mass ratio of 94.5:1:4.5 to make the negative electrode sheet; the above positive and negative electrode sheets are assembled into the same battery, the designed battery capacity is 1Ah, and the median voltage is 4.5V to obtain a high-voltage lithium battery. Ion battery, that is, spinel lithium nickel manganese oxide battery.

[0029] This embodiment provides a spinel lithium nickel manganese oxide battery formation method, including the following formation process steps:

[0030] (1) Charge with 0.02C constant cu...

Embodiment 2

[0048] In this example, LiNi 0.5 mn 1.5 o 4 As the positive electrode material, the positive electrode material LiNi 0.5 mn 1.5 o 4 , the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are mixed according to the mass ratio of 95:2:3 to make the positive electrode sheet; the Si / C composite material is used as the negative electrode material, and the negative electrode material Si / C composite material, The conductive agent acetylene black and the water-based adhesive LA132 are mixed according to the mass ratio of 92:3:5 to make the negative electrode sheet; the above-mentioned positive and negative electrode sheets are assembled into the same battery, and the designed battery capacity is 1Ah, and the median voltage is 4.4 V, to obtain a high-voltage lithium-ion battery, that is, a spinel lithium nickel manganese oxide battery.

[0049] This embodiment provides a method for forming a spinel lithium nickel manganese oxide battery, comprising t...

Embodiment 3

[0059] In this example, Li 1.2 Ni 0.25 mn 0.75 o 2.35 As the positive electrode material, the positive electrode material Li 1.2 Ni 0.25 mn 0.75 o 2.35 , Conductive agent acetylene black, binder polyvinylidene fluoride (PVDF) according to the mass ratio of 93:1.5:5.5 ingredients to make the positive plate; use natural graphite as the negative electrode material, the negative electrode material natural graphite, conductive agent acetylene black, water-based Adhesive LA132 is mixed according to the mass ratio of 92:3:5 to make the negative electrode sheet; the above-mentioned positive and negative electrode sheets are assembled into the same battery, the designed battery capacity is 2Ah, and the median voltage is 3.3V to obtain high-voltage lithium Ion battery, that is, spinel lithium nickel manganese oxide battery.

[0060] This embodiment provides a method for forming a spinel lithium nickel manganese oxide battery, comprising the following steps:

[0061] (1) Charge w...

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Abstract

The invention discloses a formation method and a preparation method of a high-voltage lithium ion battery as well as a battery. The formation method comprises steps as follows: (1), the battery is charged at constant current of 0.015C-0.05 C at limit voltage of 0.15 V-0.5 V and put aside for 10min-3h; (2), the battery is charged at constant current I2 of 0.05C-0.15 C at the limit voltage of 0.1V-0.4V, then charged at the constant voltage higher than mean voltage by 0.1V-0.4V at the limit current of a product of I2 and 0.1 and put aside for 10min-3h; (3), the battery is discharged for 0.5h-3h at constant current of 0.05-0.2 C and put aside for 10min-3h; (4), the battery is charged at the constant current I5 of 0.2C-1 C at the limit current U3 (the highest charge cut-off voltage), charged at the constant voltage U3 at the limit current of a product of I5 and 0.1, put aside for 5min-3h, discharged at the constant current I5 at the limit voltage U4 (the lowest discharge cut-off voltage) and put aside for 20min-3 h. By means of the method, a battery material is completely activated, and the compact and stable SEI film is formed.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a formation method, a preparation method and a battery of a high-voltage lithium-ion battery. Background technique [0002] In recent years, with the rapid development and wide application of various portable electronic devices, wireless mobile communication devices and electric vehicles, people's demand for lithium-ion batteries with high specific energy, long life and low cost has become more urgent, and high-voltage cathode materials are becoming more and more important. has received increasing attention from researchers. The national "Energy Saving and New Energy Automobile Industry Development Plan 2012-2020" pointed out that by 2015, the specific energy of power battery modules will reach more than 150Wh / Kg. Although the application of high-voltage cathode materials can greatly increase the specific energy of the battery, the cycle performance and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 刘三兵卢磊朱广燕
Owner CHERY AUTOMOBILE CO LTD
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