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A low-temperature lithium-ion battery

A lithium ion battery, low temperature technology, applied in the field of lithium ion batteries, can solve the problems of high energy density batteries, low capacity, etc., achieve the best low temperature discharge performance, long cycle life, and improve the effect of high and low temperature resistance

Active Publication Date: 2019-04-19
DONGGUAN LIWINON ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the formation process of this invention, a larger current is used first to form the formation process, although it can effectively avoid the decomposition of the PC solvent and the co-intercalation leading to the peeling off of the graphite structure and the discharge requirements at the limit -60°C temperature, but for the battery model with a large capacity, not only The formation requires a large range of charging and discharging equipment, and the large heat generated during the formation process will cause the decomposition of the SEI film, and the capacity is low, which cannot meet the requirements of high energy density batteries.

Method used

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  • A low-temperature lithium-ion battery
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  • A low-temperature lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Preparation of positive electrode sheet: Lithium cobaltate, conductive carbon black, and binder polyvinylidene fluoride are uniformly mixed in NMP at a mass ratio of 97:1.0:2.0 to prepare a positive electrode slurry. The solid content of the obtained positive electrode slurry is 70%, viscosity 4000mPa·s, evenly coated on both sides of aluminum foil after passing through 200 mesh sieve, coating weight 18mg / cm 2 , press the coated pole piece at 4.15g / cm 3 The compaction density is rolled to a certain thickness, and finally edge trimming, cutting and slitting are carried out to obtain the positive electrode sheet of lithium-ion battery.

[0021] Preparation of negative electrode sheet: uniformly mix artificial graphite, CMC, SBR, and carbon nanotubes in deionized water at a mass ratio of 95.6:1.2:2.2:1.0 to prepare negative electrode slurry. The solid content of the obtained negative electrode slurry is 46%. Viscosity is 2500mPa·s, evenly coated on both sides of copper fo...

Embodiment 2

[0026] Preparation of positive electrode sheet: uniformly mix nickel-cobalt lithium manganese oxide, conductive agent carbon nanotubes, and binder polyvinylidene fluoride in NMP at a mass ratio of 96.5:1.0:1.5 to prepare a positive electrode slurry. The obtained positive electrode slurry The solid content is 65%, the viscosity is 3800mPa·s, and evenly coated on both sides of the aluminum foil after passing through a 200-mesh sieve, and the coating weight is 15mg / cm 2 , press the coated electrode piece at 3.45g / cm 3 The compaction density is rolled to a certain thickness, and finally edge trimming, cutting and slitting are carried out to obtain the positive electrode sheet of lithium-ion battery.

[0027] Preparation of negative electrode sheet: Mix natural modified graphite, CMC, SBR, and conductive carbon black in deionized water at a mass ratio of 96:1.0:2.0:1.0 to prepare negative electrode slurry. The solid content of the obtained negative electrode slurry is 40 %, with a...

Embodiment 3

[0032] Preparation of positive electrode sheet: Lithium cobaltate, conductive agent carbon nanotubes, and binder polyvinylidene fluoride are uniformly mixed in NMP at a mass ratio of 99:0.5:0.5 to prepare a positive electrode slurry. The solid content of the obtained positive electrode slurry is 75%, the viscosity is 4200mPa·s, and evenly coated on both sides of the aluminum foil after passing through a 200-mesh sieve, the coating weight is 25mg / cm 2 , press the coated pole piece at 4.0g / cm 3 The compaction density is rolled to a certain thickness, and finally edge trimming, cutting and slitting are carried out to obtain the positive electrode sheet of lithium-ion battery.

[0033] Preparation of negative electrode sheet: uniformly mix artificial graphite, CMC, SBR, and conductive carbon black in deionized water at a mass ratio of 97:1.0:1.0:1.0 to prepare negative electrode slurry. The solid content of the obtained negative electrode slurry is 50%. Viscosity is 2800mPa·s, ev...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery that can be discharged at ultra-low temperatures, including a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte thereof. The electrolytic solution includes, by mass percentage, 5%-10% of lithium salt, 85%-94% of solvent and 1-10% of additive, and the additive is three-arm polyethylene carbonate. In the present invention, the three-arm polyvinyl carbonate additive obtained by the cycloaddition reaction of VC, PS and VEC solvents is added to the electrolyte. Since the additive has a VC ring group, it can form polymerized alkylene on the surface of the graphite negative electrode. The base lithium carbonate film can effectively avoid the side reaction between the electrolyte and the negative electrode; at the same time, the addition reaction of the VEC double bond can effectively inhibit the decomposition and co-embedding of PC on the graphite negative electrode, thus improving the cycle performance of the battery. The high and low temperature resistance performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a polymer lithium ion battery capable of discharging at ultra-low temperature. Background technique [0002] Since the commercialization of lithium-ion batteries, due to their advantages such as high working voltage, high specific energy, long cycle life, and good safety performance, they have become a popular choice for mobile phones, laptop computers, electric vehicles (EV), hybrid electric vehicles (HEV), plug-in The main energy source of mobile electronic devices such as electric hybrid electric vehicles (PHEV) and various handheld portable devices. Especially in the fields of aerospace, polar scientific investigation, military mobile communication tools and equipment, etc., its demand is increasing, and the performance of lithium-ion batteries is also put forward higher requirements. Batteries are required to withstand extremely low temperatures, have high saf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 王威李载波杨山韦向红
Owner DONGGUAN LIWINON ENERGY TECH
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