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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.

Active Publication Date: 2019-04-09
SHENZHEN MOTTCELL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the country’s increasing requirements for energy density year by year, it can be predicted that ternary materials will be the general direction. From the comparison of the supply and price trend of nickel and cobalt, the future trend of high-nickel ternary materials is obvious. Generally speaking, high-nickel ternary materials Elementary positive electrode material refers to the ternary material with the mole fraction of nickel in the material greater than 0.6. Such material has the characteristics of high specific capacity and low cost, but the battery of this material has poor surface in terms of storage, and its self-discharge phenomenon is relatively poor. Obviously, after long-term storage, the capacity SOC of the battery drops more obviously

Method used

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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

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0567H01M4/36H01M4/525H01M4/505H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 不公告发明人
Owner SHENZHEN MOTTCELL NEW ENERGY TECH CO LTD
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