Low-temperature lithium-ion battery

A lithium-ion battery, low-temperature technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as restricting use, and achieve the effect of improving specific surface area, good low-temperature discharge characteristics, and good ion conductivity

Active Publication Date: 2017-03-22
GUANGDONG JIUZHOU SOLAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above factors seriously restrict its use under low temperature conditions.

Method used

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Examples

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Embodiment Construction

[0017] The following will describe in detail with reference to the drawings and specific embodiments.

[0018] This time, the polymer lithium-ion battery P854565-2300mAh is used for illustration and description. The battery includes a positive pole piece, a negative pole piece, a diaphragm, a low-temperature electrolyte, and an aluminum-plastic film casing. The positive pole piece includes positive active material, binder and conductive agent; the negative pole piece includes negative active material, binder and conductive agent.

[0019] In the positive pole sheet, the positive active material is lithium cobaltate, and its particle size is 2-12um, preferably 5-8um. It accounts for 85-95% by mass in the pole piece coating, 3-6% by mass of the conductive agent, and 2-3% of the total mass by the binder, and the single surface density of the positive pole piece coating is 50- 210g / ㎡, preferably 70-190g / ㎡. This example is most preferred: lithium cobaltate 93.5%, conductive agent...

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PUM

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Abstract

The invention relates to a low-temperature lithium-ion battery, which comprises a positive pole piece, a negative pole piece, a membrane, a low-temperature electrolyte and a housing, wherein each of the positive pole piece and the negative pole piece comprises a positive active material, a negative active material, a binder and a conductive agent; the positive active material is one or a mixture of more of a lithium cobalt oxide, lithium manganate and lithium iron phosphate and accounts for 80%-97% of total mass of a coating of the positive pole piece, the compaction density of the coating is 3.2-3.5 and the single-sided surface density of the coating of the positive pole piece is 50-210g/m<2>; the negative active material is synthetic graphite and accounts for 85%-95% of total mass of the coating of the negative pole piece, the compaction density of the coating is 1.2-1.45, the single-sided surface density of the coating of the negative pole piece is 40-110g/m<2>; and the low-temperature electrolyte is prepared from the following components in percentage by mass: 5%-20% of lithium hexafluorophosphate, 1%-5% of lithium tetrafluoroborate, 20%-30% of ethylene carbonate, 20%-30% of methyl ethyl carbonate, 20%-40% of methyl acetate, 0.5%-2% of glycol sulfite and 0.5%-2% of N,N-dimethyl trifluoroacetamide.

Description

technical field [0001] The invention relates to a low-temperature lithium ion battery. Background technique [0002] At present, lithium-ion batteries are widely used in various fields such as consumer electronics, automobiles, electric vehicles, and energy storage because of their high voltage and high energy density, clean and efficient, and no pollution to the environment. Polymer organic matter is used as a solvent, and each solvent has a certain melting point, boiling point and flash point, and the temperature varies greatly between places on the earth. Therefore, there are still some shortcomings in the use of lithium-ion batteries, and the scope of their use is limited. Especially in low-temperature occasions such as special communications, life in alpine regions, polar scientific research, and aerospace fields, there are high requirements for low-temperature discharge of lithium-ion batteries. However, when the ambient temperature used is too low, the performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583H01M4/131H01M10/058H01M10/0566H01M10/0525
CPCH01M4/131H01M4/364H01M4/505H01M4/525H01M4/583H01M10/0525H01M10/0566H01M10/058Y02E60/10Y02P70/50
Inventor 罗仕雄
Owner GUANGDONG JIUZHOU SOLAR ENERGY TECH CO LTD
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