Negative pole piece for lithium-ion battery and preparation method of negative pole piece

A technology of lithium-ion batteries and negative pole pieces, which is applied in the direction of electrode manufacturing, battery electrodes, batteries, etc., can solve the problems of effective capacity reduction and achieve the effects of increasing capacity, avoiding bulging, and avoiding consumption

Active Publication Date: 2016-07-06
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a lithium-ion battery negative electrode sheet to solve the problem of reduced effective capacity caused by the formation process, improve th

Method used

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  • Negative pole piece for lithium-ion battery and preparation method of negative pole piece
  • Negative pole piece for lithium-ion battery and preparation method of negative pole piece

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A lithium-ion battery negative electrode sheet, comprising a copper foil with a thickness of 15um as a current collector and an active material coating coated on the surface of the current collector, and the surface of the active material coating is coated with an SEI with a thickness of 10nm film, the SEI film contains lithium salt material Li 2 CO 3 . Wherein, the density of the active material coating is 320g / m 2 ; Its raw materials include mass fraction 93% natural graphite, 3% conductive carbon black (SP), 1% conductive graphite (KS6), 3% CMC.

[0036] The present embodiment also provides a method for preparing the negative pole piece of the above-mentioned lithium ion battery, comprising the following steps:

[0037] 1) Take the raw materials for preparing the active material coating according to the following mass ratio: 93% natural graphite, 3% conductive carbon black (SP), 1% conductive graphite (KS6), 3% CMC; first put each raw material into Dry in a vacuu...

Embodiment 2

[0042] A lithium-ion battery negative electrode sheet, comprising a copper foil with a thickness of 15um as a current collector and an active material coating coated on the surface of the current collector, and the surface of the active material coating is coated with an SEI with a thickness of 20nm film, the SEI film contains a lithium salt substance (Li 2 CO 3 (50%wt)+ROCO 2 Li (50%wt)). Wherein, the density of the active material coating is 320g / m 2 ; Its raw materials include mass fraction 94% natural graphite, 2% conductive carbon black (SP), 1% conductive graphite (KS6), 3% CMC.

[0043] The present embodiment also provides a method for preparing the negative pole piece of the above-mentioned lithium ion battery, comprising the following steps:

[0044] 1) Take the raw materials for preparing the active material coating according to the following mass ratio: 94% natural graphite, 2% conductive carbon black (SP), 1% conductive graphite (KS6), 3% CMC; first put each raw ...

Embodiment 3

[0049] A kind of lithium-ion battery, the cathode ternary material (622 material), the lithium-ion battery negative pole piece that embodiment 1 makes, electrolytic solution, diaphragm etc. are made sheet-winding-welding-injection according to conventional lithium-ion battery technology -The sealing is made into 053048 aluminum shell battery. 0.1C charge and discharge test (3.0-4.3V) directly after sealing. The results are shown in Table 1.

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Abstract

The invention relates to a negative pole piece for a lithium-ion battery and a preparation method of the negative pole piece. The negative pole piece comprises a current collector and an active material coating, wherein the active material coating coats the surface of the current collector; an SEI film coats the surface of the active material coating and contains a lithium salt material; and the preparation method comprises the step of coating the surface of the active material coating with the lithium salt material through a physical vapor deposition method to form the SEI film. The negative pole piece solves the problem that the effective capacity is reduced due to a formation procedure; the chemical properties of the gram capacity, the rate, the initial efficiency and the like of the battery material are improved; and meanwhile, the safety performance of the battery is improved.

Description

technical field [0001] The invention relates to a negative pole piece of a lithium ion battery and a preparation method of the negative pole piece, belonging to the technical field of lithium ion power batteries. Background technique [0002] In the 1990s, Sony Corporation of Japan (SONY) successfully developed lithium-ion batteries and commercialized them. Lithium-ion batteries have been developed rapidly due to their light weight, large volume specific capacity, high voltage, and long cycle life. At present, LiCoO is mainly used as the positive electrode material of lithium-ion batteries. 2 、LiFePO 4 , LiMnO 4 and Li(NiCoMn)O 2 Ternary system materials, negative electrode materials are non-metallic materials such as graphite, lithium titanate, hard carbon, etc. During the production of lithium-ion batteries, key materials such as positive electrodes, negative electrodes, electrolytes, and diaphragms are combined, and then through assembly, liquid injection, Formation,...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/04H01M10/0525
CPCH01M4/0423H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525H01M2004/027H01M2220/20Y02E60/10
Inventor 熊文权蔡振勇石慧谭欣欣李旭
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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