Formation method for lithium ion battery with long storage life

A lithium-ion battery and a technology of a formation method, which are applied in the field of flexible packaging lithium-ion batteries, can solve the problems of battery capacity SOC decrease, poor battery surface, etc., and achieve the effects of improving storage life and reducing oxygen content.

A lithium-ion battery and a technology of a formation method, which are applied in the field of flexible packaging lithium-ion batteries, can solve the problems of battery capacity SOC decrease, poor battery surface, etc., and achieve the effects of improving storage life and reducing oxygen content.

CN109599595AActive Publication Date: 2019-04-09SHENZHEN MOTTCELL NEW ENERGY TECH CO LTD
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Wherein VC accounts for 1% of the total volume of the electrolyte, FEC accounts for 2% of the total volume of the electrolyte, FEC / EC=2, and the formation method adopts open formation, which includes the following steps:

[0031] 1) Place the injected lithium-ion battery on the formation device;

[0032] 2) Charge the battery with a constant current of 0.02C to 3.4V;

[0033] 3) Charge at a constant voltage of 3.4V until the charging current drops below 0.01C;

[0034] 4), between 3.4V and 3.2V, conduct constant current charging and discharging cycles for 3 times, and the charging and discharging current is 0.02C;

[0035] 5) Heat the battery to 40°C, pulse charge the battery to 3.8V with a pulse current, the magnitude of the pulse current is 0.1C, the pulse action time is 20s, and the interval is 5s;

[0036] 6), let it stand still, and lower the temperature of the battery to room temperature;

[0037] 7) Charge the battery with a constant current of 0.2C to 4.2V; ...

Embodiment 2

[0043] Wherein VC accounts for 1% of the total volume of the electrolyte, FEC accounts for 4% of the total volume of the electrolyte, FEC / EC=4, and the formation method adopts open formation, which includes the following steps:

[0044] 1) Place the injected lithium-ion battery on the formation device;

[0045] 2) Charge the battery with a constant current of 0.05C to 3.5V;

[0046] 3) Charge with a constant voltage of 3.5V until the charging current is lower than 0.01C;

[0047] 4), 3 times of constant current charging and discharging cycle between 3.5V and 3.3V, the charging and discharging current is 0.05C;

[0048] 5) Heat the battery to 45°C, and pulse charge the battery to 4.0V with a pulse current, the magnitude of the pulse current is 0.2C, the pulse action time is 100s, and the interval is 10s;

[0049] 6), let it stand still, and lower the temperature of the battery to room temperature;

[0050]7) Charge the battery with a constant current of 0.5C to 4.3V;

[005...

Embodiment 3

[0056] Wherein VC accounts for 0.5% of the total volume of the electrolyte, FEC accounts for 1.5% of the total volume of the electrolyte, FEC / EC=3, and the formation method adopts open formation, which includes the following steps:

[0057] 1) Place the injected lithium-ion battery on the formation device;

[0058] 2), charging the battery with a constant current of 0.03C to 3.4V;

[0059] 3) Charge at a constant voltage of 3.4V until the charging current drops below 0.01C;

[0060] 4), between 3.4V and 3.3V, carry out constant current charge and discharge cycles for 3 times, and the charge and discharge current is 0.03C;

[0061] 5) Heat the battery to 42°C, pulse charge the battery to 3.9V with a pulse current, the magnitude of the pulse current is 0.1C, the pulse action time is 50s, and the interval is 10s;

[0062] 6), let it stand still, and lower the temperature of the battery to room temperature;

[0063] 7) Charge the battery with a constant current of 0.3C to 4.2V;...

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Abstract

The invention provides a formation method for a lithium ion battery with a long storage life. An anode active substance in the lithium ion battery consists of LiNi0.7Mn0.2Ni0.1O2; the electrolyte of the lithium ion battery comprises additive consisting of vinylene carbonate (VC) and fluoroethylene carbonate (FEC), wherein the VC occupies 0.5-1% of the total volume of the electrolyte, the FEC occupies 1.5-4% of total volume of the electrolyte, and the volume content ratio FEC / EC of the FEC and the VC is above 2. The formation method comprises a staged formation technology and a staged exhaust technology, a stable SEI (Solid Electrolyte Interphase) membrane is formed, anode surface metal can prevent from being dissolved in a battery storage process, and a self-discharge phenomenon is avoided.

Description

technical field [0001] The invention relates to the technical field of flexible packaging lithium-ion batteries, in particular to a method for forming lithium-ion batteries with long storage life. Background technique [0002] Lithium-ion batteries, as a means of making batteries lightweight and high-energy, will occupy a relatively high proportion of the incremental market. The new policy of new energy vehicles has released a signal to promote battery performance and increase energy density. With the continuous improvement of the subsidy threshold, lithium-ion batteries can help more battery companies improve energy density and product competitiveness. The ternary material nickel-cobalt-manganese has the characteristics of high specific capacity, long cycle life, low toxicity and low cost. In addition, there is a good synergistic effect among the three elements, so it has been widely used. In redox energy storage, nickel is the main component. Increasing the content of ni...

Claims

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Application Information

Patent Timeline
09 Apr 2019
Publication
CN109599595A
IPC
H01M10/058; H01M10/0567; H01M4/36; H01M4/525; H01M4/505; H01M10/0525
CPC
H01M4/362; H01M4/505; H01M4/525; H01M10/0525; H01M10/0567; H01M10/058; H01M2300/0025; Y02E60/10
Inventors
不公告发明人