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Ultralow temperature and high-rate lithium ion battery and preparation method thereof

A lithium-ion battery, high-rate technology, applied in electrolyte battery manufacturing, electrode manufacturing, secondary batteries, etc., can solve problems such as inability to charge and discharge normally, achieve improved low-temperature charging performance, easy insertion and extraction, and increased rate. The effect of charging and low-temperature charging performance

Active Publication Date: 2019-05-21
贵州省铜仁华迪斯新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above technical problems, the present invention provides an ultra-low temperature high-rate lithium-ion battery and its preparation method, which breaks through that the traditional lithium-ion battery cannot be discharged normally when the temperature is lower than -20°C, and the discharge at the low temperature of -30°C is not greater than 1C. The problem of being unable to charge when the temperature is lower than 0°C has greatly broadened the application range of lithium-ion batteries in alpine regions and military fields

Method used

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  • Ultralow temperature and high-rate lithium ion battery and preparation method thereof
  • Ultralow temperature and high-rate lithium ion battery and preparation method thereof

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preparation example Construction

[0030] As an embodiment of the present invention, the preparation method of ultra-low temperature high rate lithium ion battery comprises the following steps:

[0031] (1) Stir and mix lithium manganate, composite conductive agent and water-based binder, and vacuumize to obtain positive electrode slurry, and coat the positive electrode slurry with a double-sided surface density of 150-250g / ㎡ through a coating machine to form a positive electrode sheet , the coating temperature is 70-100°C;

[0032] (2) Stir and mix graphite, composite conductive agent and water-based binder, and vacuumize to obtain the negative electrode slurry, and apply the negative electrode slurry to a negative electrode sheet with a double-sided density of 70-90g / ㎡ through a coating machine, and coat Cloth temperature is 55-85°C;

[0033] (3) Rolling the positive and large sheets, the compaction density is 2.5-2.8g / cm 3 , roll pressing the negative pole piece, the compaction density is 1.2-1.3g / cm 3 Af...

Embodiment 1

[0054] An ultra-low temperature and high rate lithium-ion battery, including a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, the mass percentage of the positive electrode sheet is 93.3% lithium manganate, 3.7% composite conductive agent and 3.0% water-based binder; the negative electrode The mass percentage of sheet composition is 93.4% graphite, 3.3% composite conductive agent and 3.3% water-based binder; the composite conductive agent in positive electrode sheet and negative electrode sheet is composed of acetylene black, carbon nanotubes and graphene.

[0055] Lithium manganate particle size d 50 10μm, the specific surface area is 0.3-0.8m 2 / g, tap density ≥ 1.6g / cm 3 , The gram capacity is 95-100mAh / g.

[0056] Graphite particle size d 50 9μm, the specific surface area is 1.8-2.8m 2 / g, tap density ≥ 1.0g / cm 3 , The gram capacity is 340-350mAh / g.

[0057] In the composite conductive agent, carbon nanotubes and graphene are sus...

Embodiment 2

[0079] An ultra-low temperature and high rate lithium ion battery, including positive electrode sheet, negative electrode sheet, separator and electrolyte, the mass percentage of positive electrode sheet is 94% lithium manganate, 3.5% composite conductive agent and 2.5% water-based binder; negative electrode The mass percentage of sheet composition is 94.0% graphite, 3.0% composite conductive agent and 3.0% water-based binder; the composite conductive agent in the positive electrode sheet and the negative electrode sheet is composed of acetylene black, carbon nanotubes and graphene.

[0080] Lithium manganate particle size d 50 8μm, the specific surface area is 0.3-0.8m 2 / g, tap density ≥ 1.6g / cm 3 , The gram capacity is 95-100mAh / g.

[0081] Graphite particle size d 50 11μm, the specific surface area is 1.8-2.8m 2 / g, tap density ≥ 1.0g / cm 3 , The gram capacity is 340-350mAh / g.

[0082] In the composite conductive agent, carbon nanotubes and graphene are suspensions wi...

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Abstract

The invention discloses an ultralow temperature and high-rate lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive plate, a negative plate, an isolation membrane and electrolyte; the positive plate is prepared from the components in mass percent: 92.5-94.0% of lithium manganate, 3.5-4.0% of composite conductive agent, and 2.5-3.5% of water-based binder; the negative plate is prepared from the components in mass percent:93.0-94.0% of graphite, 3.0-3.5% of composite conductive agent and 3.0-3.5% of water-based binder. The composite conductive agent in each of the positive plate and the negative plate is prepared from acetylene black, carbon nano-tube and graphene. For improving the conductivity of the electrode plate, reducing the polarization and improving the electric conductivity of the electrolyte at low temperature, the rate performance, the low-temperature charging / discharging performance and the safety performance of the lithium battery are effectively improved by optimizing the material collation and matching and like angles. The ultralow temperature and high-rate lithium ion battery disclosed by the invention breaks through the low-temperature application limitation of the existing lithium ion technology, greatly improves the electric chemistry performance of the lithium ion battery under the ultra-low temperature condition,and provides the guarantee for the application in the alpine region and military project.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an ultra-low temperature and high-rate lithium-ion battery and a preparation method thereof. Background technique [0002] As a green new energy, lithium-ion batteries have the characteristics of high discharge voltage platform, high energy density, good rate performance, good safety performance, small self-discharge, no memory effect, and environmental protection. They are widely used in digital products, communication equipment, In various fields such as medical equipment, vehicles, electric tools, energy storage, and military industry, with the continuous expansion of application fields and application ranges, higher requirements are placed on battery performance. [0003] Traditional lithium-ion batteries have poor low-temperature performance, especially low-temperature charging and low-temperature high-rate discharge performance. The charging temperature of tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/587H01M4/62H01M4/1391H01M4/1393H01M4/04H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 李政伦王振海宋玉峰张文景李争军
Owner 贵州省铜仁华迪斯新能源有限公司
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