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Lithium ion battery electrolyte and battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of low conductivity, affecting the electrolyte system, poor performance of lithium batteries, etc., to increase internal block, avoid direct contact, and improve safety

Inactive Publication Date: 2018-10-16
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since these substances are non-electrochemically active and have extremely low conductivity, they will significantly affect the energy density of the battery; in addition, such substances usually use crystalline hydrates, which will contain a small amount of adsorbed water, which will affect the energy density of the battery. Electrolyte system, resulting in poor performance of lithium batteries
The disadvantage of this method is that the decomposition of the substance responds slowly to the heat inside the battery, and it cannot suppress thermal runaway in time.

Method used

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  • Lithium ion battery electrolyte and battery
  • Lithium ion battery electrolyte and battery
  • Lithium ion battery electrolyte and battery

Examples

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preparation example Construction

[0031] The preparation method of the battery provided by the invention:

[0032] Step 1, preparing electrolyte: the electrolyte is the electrolyte provided by the present invention as described above;

[0033] Step 2, preparing the pole core: the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence and then wound to obtain the pole core;

[0034] Step 3, packaging the battery: put the pole core prepared in step 2 into the casing;

[0035] Step 4, injecting liquid and sealing: injecting electrolyte solution into the housing and sealing it to obtain a battery.

Embodiment 1

[0037] (1) Preparation of positive electrode

[0038] Lithium cobaltate, acetylene black, polytetrafluoroethylene and N-methylpyrrolidone are mixed and stirred in a weight ratio of 100:3:2:50 to form a slurry, and the slurry is evenly coated on the aluminum foil of the conductive substrate Both sides were then dried at 110° C., rolled, and cut to obtain a positive electrode sheet with a size of 485 mm×44 mm×0.140 mm.

[0039] (2) Preparation of negative electrode

[0040] Fully mix and stir natural graphite, carboxymethyl cellulose, styrene-butadiene rubber and water according to the weight ratio of 100:2:2:180 to obtain a uniform slurry, and evenly coat the slurry on a 0.008 mm conductive substrate copper foil The two sides were dried at 100° C., and finally, a negative electrode sheet with a size of 480 mm×45 mm×0.156 mm was obtained by cutting.

[0041] (3) Battery assembly

[0042]The positive electrode sheet, negative electrode sheet and polypropylene film prepared abo...

Embodiment 2

[0044] Battery S2 was prepared in the same method steps as in Example 1, except that the composition of the electrolyte was: 42.5 ml of an organic solvent, and a mixed organic solvent containing EC, EMC and DEC was selected, wherein the volume ratio of EC, EMC and DEC was 1:1:1; additive (PEO-PPO-PEO, Aladdin) 7.5ml, the average molecular weight of PEO-PPO-PEO is 2900; add a certain amount of LiPF 6 , and its concentration is 1mol / L.

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Abstract

The invention provides an electrolyte. The electrolyte comprises lithium salt, an additive and an organic solvent, wherein the additive is polyethylene glycol-polypropylene glycol-polyethylene glycol.The invention also provides a battery. The battery uses the electrolyte provided by the invention. According to the electrolyte and the battery provided by the invention, the phenomenon of thermal runaway possibly appearing in the using process of the battery can be controlled effectively, and moreover, the negative effects on the performances of the battery are little.

Description

technical field [0001] The invention belongs to the field of battery safety, and in particular relates to a lithium-ion battery electrolyte and a battery. Background technique [0002] As people pay more and more attention to the environment, their awareness of environmental protection is getting stronger; as a new energy vehicle that replaces traditional fuel vehicles, its demand is also increasing. However, as the number of new energy vehicles on the road continues to increase, safety, especially the safety of power batteries as the power source of new energy vehicles, becomes more and more important. [0003] In the power battery / lithium-ion battery, due to the use of flammable carbonate electrolyte; during use, it may be overcharged or overdischarged, or due to accidental impact (especially under the influence of factors such as needles) , causing the internal reaction of the single battery to intensify, making the internal temperature of the battery rise, leading to sa...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/0567H01M10/4235H01M10/42Y02E60/10
Inventor 李冰王圣
Owner BYD CO LTD
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