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Electrolyte and secondary battery

A secondary battery and electrolyte technology, applied in the field of electrolyte and secondary battery, can solve the problems of shortening the use time of end products, worsening battery life, battery capacity loss, etc., and improving the room temperature cycle performance and high temperature storage performance. , good compatibility, low impedance effect

Active Publication Date: 2018-06-08
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of consumer electronics, lithium batteries with fast charging performance have gradually become mainstream products in the market. At present, fast charging batteries (referred to as fast charging batteries) are mainly realized through high-rate charging. High-rate charging can easily lead to a rapid rise in the internal temperature of the battery. worsen battery life
In addition, during the storage process of the battery, especially under high temperature conditions, the internal capacity loss of the battery is serious, resulting in a shorter service life of the end product

Method used

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  • Electrolyte and secondary battery
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  • Electrolyte and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the preparation of electrolyte L1#~L12#

[0018] According to the mass ratio EC:DEC:PC:FEC=30:50:15:5 uniformly mix EC, DEC, PC and FEC to form an organic solvent, take fully dried lithium salt LiPF 6 Dissolve in the above organic solvent to obtain a lithium salt concentration of 1 mol / L, then add the combined additives BMI and MMDS, and mix evenly to obtain an electrolyte. The structural formula of the BMI is: The structural formula of the MMDS is:

[0019] The composition relationship of the combined additives in the electrolyte L1#~L12# is shown in Table 1.

[0020] Table 1

[0021]

Embodiment 2

[0022] Embodiment 2: Preparation of lithium ion batteries B1#~B12#

[0023] (1) Preparation of positive electrode sheet: lithium cobalt oxide (LiCoO 2 ), binder (polyvinylidene fluoride), conductive agent (acetylene black) according to the weight ratio of LiCoO 2 : polyvinylidene fluoride: acetylene black = 96: 2: 2 to mix, add N-methylpyrrolidone (NMP), stir under the action of a vacuum mixer until the system becomes uniform, and obtain the positive electrode slurry; evenly coat the positive electrode slurry Covered on an aluminum foil with a thickness of 12 μm; the aluminum foil was dried at room temperature, then transferred to an oven at 120° C. for 1 hour, and then subjected to cold pressing and slitting to obtain positive electrode sheets.

[0024] (2) Preparation of negative plate: graphite, acetylene black, thickener sodium carboxymethyl cellulose (CMC), and binder styrene-butadiene rubber are graphite in weight ratio: acetylene black: binder styrene-butadiene rubber:...

Embodiment 3

[0026] Embodiment 3: The cycle performance test of lithium ion battery B1#~B12#

[0027] The lithium-ion batteries B1# to B12# in Example 2 were tested according to the following method: at 25°C, the lithium-ion batteries were charged at a constant current of 1C to 4.4V, and then charged at a constant voltage to a current of 0.05C. Then use 1C constant current to discharge to 3.0V. At this time, it is the first cycle. According to the above cycle conditions, carry out 100, 300, and 500 cycles of charging / discharging, respectively, and calculate the battery cycles of 100, 300, and 500 cycles. The capacity retention rate after the cycle, wherein, the capacity retention rate after the cycle is calculated according to the following formula, the capacity retention rate after the cycle = (discharge capacity after the corresponding number of cycles / discharge capacity for the first cycle) × 100%, each lithium ion battery See Table 2 for relevant test data obtained through testing.

...

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Abstract

The invention discloses electrolyte and a secondary battery. The electrolyte comprises N,N'-(4,4'-methylene diphenyl)bismaleimide (BMI) and methylene methanedisulfonate (MMDS). The electrolyte is applied to a lithium ion battery and can participate film formation in an anode. The functional mixing additives MMDS and BMI in the electrolyte have synergetic functions and have the toughness of a polymer and high ionic conductivity of an inorganic sulfuric salt, and in addition, the formed film has relatively low impedance and is excellent in high-temperature stability and not easy to damage undera high temperature condition, so that solvents and anodes can be effectively prevented from reactions to consume lithium, and when being applied to a lithium ion battery, the large multiplying power charge temperature increase can be reduced, a high-temperature storage capacity retention rate of the lithium ion battery can be increased, and meanwhile room-temperature circulation properties and high-temperature storage properties of the lithium ion battery at a high voltage can be remarkably improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrolyte and a secondary battery. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics products, energy storage and power batteries due to their advantages such as high specific energy, long cycle life, and small self-discharge. In the field of consumer electronic products, lithium batteries with fast charging performance have gradually become mainstream products in the market. At present, fast charging batteries (referred to as fast charging batteries) are mainly realized by high-rate charging. High-rate charging can easily lead to a rapid rise in the internal temperature of the battery. Deteriorate battery life. In addition, during the storage process of the battery, especially under high temperature conditions, the capacity loss inside the battery is serious, resulting in a shorter service life of the end product. It can be seen that it i...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 黄刚李枫杜冬冬于立娟廖兴群
Owner HIGHPOWER TECH HUIZHOU
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