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High-energy-density lithium ion battery

A lithium-ion battery and compaction density technology, which is applied in the field of lithium batteries, can solve problems that affect battery charging and discharging, difficult ion transmission, and powder-off of pole pieces, so as to improve battery performance, improve coating quality, and prevent powder-dropping and brittle effect

Active Publication Date: 2018-11-27
ZHEJIANG QIANJIANG LITHIUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different batteries need to select materials and processing techniques according to performance requirements, and control different compaction densities. If the compaction density is too large, it is difficult to transmit ions, which affects the charging and discharging of the battery, and the pole pieces are easy to drop powder and become brittle.

Method used

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Examples

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Effect test

Embodiment 1

[0037] The high energy density lithium ion battery in this embodiment includes a positive pole piece, a negative pole piece, and a diaphragm.

[0038] The positive electrode sheet is coated with a positive electrode active material, and the positive electrode active material includes the following components in mass percentage: 3% of polyvinylidene fluoride, 1% of conductive carbon black, 96% of lithium iron phosphate, and the particle size of lithium iron phosphate is D 50 It is 9-10μm, and the compaction density of the positive pole piece is its ultimate compaction density of 2.45g / cm 3 , surface density is 370g / m 2 .

[0039]The negative pole sheet is coated with negative active material, and the negative active material comprises the following mass percentage components: CMC1.6%, conductive carbon black 1.5%, graphite 94.9%, styrene-butadiene emulsion 2%, and the compacted density of the negative pole piece is 1.46g / cm 3 , with a thickness of 120 μm.

[0040] Wherein, ...

Embodiment 2

[0046] The high energy density lithium ion battery in this embodiment includes a positive pole piece, a negative pole piece, and a diaphragm.

[0047] The positive electrode sheet is coated with a positive active material, and the positive active material includes the following components in mass percentage: 2.7% polyvinylidene fluoride, 0.8% conductive carbon black, 96.5% lithium iron phosphate, the particle size of lithium iron phosphate is D 50 It is 8-9μm, and the compaction density of the positive pole piece is its ultimate compaction density of 2.55g / cm 3 , surface density is 380g / m 2 .

[0048] Negative pole sheet is coated with negative pole active material, and negative pole active material comprises the component of following mass percent: CMC1.5%, conductive carbon black 1.4%, graphite 95.2%, styrene-butadiene emulsion 1.9%, the compaction density of negative pole pole piece is 1.5g / cm 3 , with a thickness of 115 μm.

[0049] Wherein, the styrene content of the ...

Embodiment 3

[0055] The high energy density lithium ion battery in this embodiment includes a positive pole piece, a negative pole piece, and a diaphragm.

[0056] The positive electrode sheet is coated with a positive electrode active material, and the positive electrode active material includes the following components in mass percentage: 3.2% of polyvinylidene fluoride, 1.3% of conductive carbon black, 96.5% of lithium iron phosphate, and the particle size of lithium iron phosphate is D 50 It is 10-11μm, and the compaction density of the positive pole piece is its ultimate compaction density of 2.4g / cm 3 , surface density is 360g / m 2 .

[0057] Negative pole sheet is coated with negative pole active material, and negative pole active material comprises the component of following mass percentage: CMC1.7%, conductive carbon black 1.6%, graphite 94.6%, styrene-butadiene emulsion 2.1%, the compaction density of negative pole pole piece is 1.4g / cm 3 , with a thickness of 125 μm.

[0058]...

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Abstract

The invention relates to a high-energy-density lithium ion battery, belonging to the technical field of lithium batteries. The high-energy-density lithium ion battery comprises an anode pole piece, acathode pole piece and a diaphragm, wherein the anode pole piece is coated with an anode active material; and the cathode pole piece is coated with a cathode active material. The high-energy-density lithium ion battery is characterized in that the limiting compaction density of the anode pole piece is 2.4g / cm<3>-2.55g / cm<3>, and the surface density is 360g / m<2>-380g / m<2>; and the limiting compaction density of the cathode pole piece is 1.4g / cm<3>-1.50g / cm<3>, and the thickness is 115-125 microns. By virtue of the reasonable configuration of anode and cathode materials of the lithium batteries,the anode pole piece can reach the limiting compaction density, the high-magnifying power charging and discharging of the batteries are effectively guaranteed under the conditions, and meanwhile, battery capacity is increased, so that the battery performance is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries and relates to a lithium ion battery with high energy density. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery), which mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] In the electrode, the compaction density of the pole piece is related to the softness, hardness and pressure of the material. Generally speaking, the coating of the pole piece requires a gap of tens of nanometers to facilitate the wetting and entry of the electrolyte and the transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/133H01M4/62H01M2/26H01M10/0525
CPCH01M4/133H01M4/136H01M4/622H01M10/0525H01M50/531Y02E60/10
Inventor 胡雅平李正斌仇健荣刘仁娟闫振忠何凯强
Owner ZHEJIANG QIANJIANG LITHIUM TECH CO LTD
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