Lithium ion battery and negative pole piece thereof

A technology for lithium-ion batteries and negative electrodes, applied in non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve SEI film composition, structure, compactness, uniformity and stability Discharge irreversible capacity increase, reduce battery charge and discharge efficiency and battery capacity and other issues

Active Publication Date: 2013-04-03
WUXI FUHONG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of the SEI film has a crucial impact on the performance of the electrode. On the one hand, it can effectively prevent solvent molecules from entering the electrode material to form co-embedding, and cause damage to the electrode material, thereby improving the cycle characteristics and service life of the electrode. On the other hand , the formation of the SEI film consumes a large part of lithium ions, which increases the irreversible capacity of the battery for the first charge and discharge, and reduces the charge and discharge efficiency and battery capacity of the battery.
At the same time, factors such as the morphology, composition, chemical formation process, and temperature of the electrode surface have a greater impact and uncertainty on the composition, structure, compactness, uniformity, and stability of the SEI film.

Method used

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  • Lithium ion battery and negative pole piece thereof

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Experimental program
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Effect test

Embodiment 1

[0031] A preparation of lithium-ion battery negative electrode

[0032] 1) Preparation of negative electrode active material layer

[0033] Mix and disperse artificial graphite, Super-P (Temical), PVDF-HFP binder, and N-methylpyrrolidone at a mass percentage of 95:1.5:3.5:125 to prepare a uniform coating slurry;

[0034] Using a 9 μm thick copper foil as a substrate, the coating slurry was evenly coated on both sides of the copper foil, and dried at 120° C., and the thickness of the pole piece was 160 μm after drying.

[0035] The dried pole piece is hot rolled, the rolling temperature is 50°C, the pressure is 50MPa, the thickness of the pole piece after rolling is 105μm, and the compacted density of the pole piece is about 1.55g / cm 3 .

[0036] 2) Preparation of hard carbon material layer: Lithium carbonate (Li 2 CO 3 ), lithium methyl oxide (CH 3 OLi), lithium methyl carbonate (CH 3 OCO 2 Li), lithium methanesulfonate diester (CH 2 OSO 3 Li) 2 According to the mass p...

Embodiment 2

[0049] A preparation of lithium-ion battery negative electrode

[0050] 1) Preparation of negative electrode active material layer

[0051] Mix and disperse natural graphite, conductive agent Super-P (Temical), acrylic resin binder, and N-methylpyrrolidone at a mass percentage of 95.5:1.5:3:125 to prepare a uniform coating slurry;

[0052] Using a 9 μm thick copper foil as a substrate, the coating slurry was evenly coated on both sides of the copper foil, and dried at 120° C., and the thickness of the pole piece was 160 μm after drying.

[0053] The dried pole piece is hot rolled, the rolling temperature is 50°C, the pressure is 50MPa, the thickness of the pole piece after rolling is 100μm, and the compacted density of the pole piece is about 1.55g / cm 3 .

[0054] 2) Preparation of hard carbon material layer

[0055] Lithium carbonate (Li 2 CO 3 ), lithium sulfide (Li 2 S), Lithium carbonate diester (CH 2 OCO 2 Li) 2 , according to the mass percentage is Li 2 CO 3 :...

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Abstract

The invention provides a lithium ion battery and a negative pole piece thereof. The negative pole piece of the lithium ion battery comprises a negative pole current collector and a negative pole active material layer which is arranged on the negative pole current collector. The negative pole piece of the lithium ion plate is characterized by further comprising a hard carbon material layer which contains hard carbon and is arranged on the negative pole active material layer. The hard carbon material layer also contains lithium salt which has mixture of lithium carbonate, lithium sulfide, lithium carbonic ester, alkoxy lithium, lithium sulphonate and alkyl diester lithium. The lithium ion battery comprises a positive pole piece, a negative pole piece which adopts the negative pole piece of the lithium ion battery, an isolating membrane arranged between adjacent positive and negative pole pieces, and electrolyte. By utilizing the lithium ion battery and the negative pole piece, the low temperature performance and the safety performance of the battery are effectively improved, and the rate capability and the discharge efficiency of the lithium ion battery are improved, the service life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium ion battery and its negative pole piece. Background technique [0002] Today is a society with rapid development of electronic information, various electronic products are developing rapidly, the popularity of electronic products is expanding day by day, and people's dependence on various electronic products is also increasing. At the same time, the battery power supply that provides energy support for portable electronic products is increasingly becoming a bottleneck in the development of new-generation electronic products, which puts forward higher requirements for battery performance. In addition to the continuous improvement and improvement of their own functions, the current electronic products are also developing towards lighter and thinner appearance, which requires that batteries, as an essential component of electronic products, must be able to provide higher energy de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCY02E60/10
Inventor 杨红平陈乐茵罗旭芳姜冬冬
Owner WUXI FUHONG TECH
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