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A kind of formation method of lithium ion battery

A lithium-ion battery and chemical formation method technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of battery capacity SOC decrease, battery surface difference, etc., and achieve the effect of improving storage life and reducing oxygen content

Active Publication Date: 2020-05-19
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;

[0051...

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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PUM

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Abstract

The invention provides a method for forming a lithium-ion battery, wherein the positive electrode active material in the lithium-ion battery is mainly composed of LiNi 0.7 mn 0.2 Ni 0.1 o 2 Composed, the electrolyte of the lithium-ion battery includes additives composed of vinylene carbonate VC and fluoroethylene carbonate FEC, wherein VC accounts for 0.5-1% of the total volume of the electrolyte, and FEC accounts for 0.5-1% of the total volume of the electrolyte 1.5-4%, and the volume ratio FEC / EC of FEC and VC is more than 2, wherein the formation method includes a staged formation process and a staged exhaust process, so as to form a stable SEI film and prevent the battery from Metal dissolution on the surface of the positive electrode during storage, and the occurrence of self-discharge.

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. 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 nickel in the material to...

Claims

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Application Information

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Patent Type & Authority Patents(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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