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A high energy density lithium-ion battery

A lithium-ion battery, compaction density technology, applied in the field of lithium batteries, can solve the problems of affecting battery charge and discharge, difficult ion transmission, high compaction density, etc., to extend cycle life, reduce PACK costs, and improve adhesion. Effect

Active Publication Date: 2022-01-11
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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  • A high energy density lithium-ion battery
  • A high energy density lithium-ion battery

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Experimental program
Comparison scheme
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 and belongs to the technical field of lithium batteries. The lithium ion battery of the present invention includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet is coated with a positive electrode active material, and the negative electrode sheet is coated with a negative electrode active material. It is characterized in that the positive electrode sheet The compacted density is its ultimate compacted density 2.4-2.55g / cm 3 , area density is 360‑380g / m 2 , the compacted density of the negative electrode piece is 1.4-1.50g / cm 3 , thickness is 115‑125μm. Through the reasonable configuration of the positive and negative electrode materials of the lithium-ion battery, the present invention enables the positive electrode plate to reach its ultimate compaction density, and effectively ensures the high-rate charging and discharging of the battery under this condition, while increasing the battery capacity and effectively improving the battery capacity. improved battery performance.

Description

Technical field [0001] The invention belongs to the technical field of lithium batteries and relates to a high-energy-density lithium-ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charge and discharge process, Li+ intercalates and deintercalates back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode and embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; during discharge, the opposite is true. [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 pole piece coating requires a gap of tens of nanometers to facilitate the wetting and entry of the electrolyte and facilitate the transm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/136H01M4/133H01M4/62H01M50/533H01M10/0525
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