Negative pole piece and lithium-ion battery

A negative pole piece, lithium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limiting the fast charging ability of lithium ion batteries, limited lithium ion intercalation and extraction ability, etc., to improve the first charge and discharge efficiency, The effect of improving charging capacity and improving energy density

Active Publication Date: 2016-07-06
NINGDE AMPEREX TECH
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Problems solved by technology

[0003] However, the interlayer spacing of negative electrode graphite materials used in lithium-ion batteries is only 0.33nm, the ability of lithium ion intercalation and extraction is limited, and the lithium ion diffusion coefficient is about 10. -15 cm 2 / s, thus limiting the fast charging capability of Li-ion batteries

Method used

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  • Negative pole piece and lithium-ion battery
  • Negative pole piece and lithium-ion battery
  • Negative pole piece and lithium-ion battery

Examples

Experimental program
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Embodiment

[0055] Embodiment: Positive pole piece, negative pole piece and lithium ion battery and preparation method thereof:

[0056] (1) Preparation of positive electrode sheet 1 containing lithium supplementary layer:

[0057] The cathode active material LiCoO 2 , binder PVDF, and conductive carbon (SP) are dissolved in the solvent N-methylpyrrolidone (NMP) according to the mass ratio of 96:2:2 and stirred evenly to make a slurry, which is evenly coated on the positive electrode current collector 11 (aluminum foil) After drying, the positive electrode sheet 1 of the lithium ion battery is made, and after drying, a positive electrode film 12 with a thickness of 0.20 mm is formed, that is, a positive electrode sheet without a lithium supplementary layer 3 is obtained, such as figure 2 shown;

[0058] Then, the lithium metal powder was mixed according to 0.10mg / cm 2 Sprinkle on the surface of the prepared positive electrode film 12, and then roll to form the positive electrode lithi...

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PUM

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Abstract

The invention relates to a negative pole piece, which comprises a negative pole current collector and a negative pole film layer, wherein the negative pole film layer is arranged on the negative pole current collector and comprises at least two negative pole active material layers; and the at least two negative pole active material layers are sequentially arranged on the negative pole current collector from the inside to the outside according to the lithium-ion dynamic property decreasing order of the negative pole active material layers. The invention particularly relates to the negative pole film layer of which the negative pole active material is a graphite/hard carbon and/or silicon material composite material. The graphite is compounded with the hard carbon and/or silicon material, and a multi-layer gradient of which the lithium-ion dynamic property is sequentially increased from the outside to the inside is formed, so that the negative pole piece has the effects of simultaneously improving the charging capability and increasing the energy density.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a negative pole piece and a lithium-ion battery. Background technique [0002] As an efficient mobile energy source, lithium-ion batteries have been widely used in electronic products such as telephones, notebook computers, and digital cameras due to their advantages of high voltage, high specific energy, and long cycle life. Especially with the rapid popularization of smart phones in recent years, people have higher and higher requirements for the charging rate of lithium-ion batteries for energy storage. [0003] However, the interlayer spacing of negative electrode graphite materials used in lithium-ion batteries is only 0.33nm, the ability of lithium ion intercalation and extraction is limited, and the lithium ion diffusion coefficient is about 10. -15 cm 2 / s, thus limiting the fast charging capability of lithium-ion batteries. [0004] In view of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/587H01M10/0525
CPCH01M4/38H01M4/587H01M10/0525Y02E60/10
Inventor 牛少军吴六二
Owner NINGDE AMPEREX TECH
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