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Multilayer-film negative pole shoe and making method thereof

A technology of negative pole piece and multi-layer film, applied in the field of multi-layer film negative pole piece for lithium ion battery and its production, can solve the problem of charge and discharge capacity, cycle life current density, characteristic limitation of discharge battery, environmental pollution and complicated process and other problems, to achieve the effect of improving battery safety performance, reducing costs, and improving production efficiency

Inactive Publication Date: 2011-05-11
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has complex procedures, high cost, certain environmental pollution, thick film layer, and certain limitations in charge and discharge capacity, cycle life, current density, discharge and other battery characteristics.

Method used

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  • Multilayer-film negative pole shoe and making method thereof
  • Multilayer-film negative pole shoe and making method thereof
  • Multilayer-film negative pole shoe and making method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using DC magnetron sputtering technology, using crystalline silicon-aluminum sputtering target as a target, a Si-Al composite film 2 is deposited on a copper foil 1 with a thickness of 15 μm (see figure 2 ), forming a semi-finished product with a negative electrode material layer. The sputtering power of the target is 500W, the flow rate of the gas Ar is 58sccm, and the thickness of the obtained composite film layer is 10 μm, wherein the atomic ratio of Si:Al is 100:50.

[0034] Preparation of polymer coating: polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) is used as binder, butanone and butanol are used as solvents, ethylene carbonate is used as plasticizer, and silicon dioxide is used as oxide particles . The oxide particles are dissolved in butanol, the volume ratio of butanone and butanol is 3:1, and the content of silicon dioxide is 10% of the weight of polyvinylidene fluoride-hexafluoropropylene. Add the oxide particles and plasticizer dissolved in buta...

Embodiment 2

[0037] Using radio frequency magnetron sputtering technology, using crystalline silicon-aluminum sputtering target and graphite target as target materials, 5 μm Si-Al composite film layer 2, 1 μm carbon layer 5, 5 μm copper foil 1 are sequentially deposited on the copper foil 1 with a thickness of 15 μm. Si-Al composite film layer 2, carbon layer 5 of 1 μm (see image 3 ), forming a semi-finished product with a negative electrode material layer. When depositing the Si-Al composite film layer 2, the sputtering power of the Si-Al target is 500W, the flow rate of the gas Ar is 58sccm, wherein the atomic ratio of Si:Al is 100:50; when depositing the carbon layer, the sputtering power is 400W , the gas Ar flow rate is 36 sccm.

[0038] Preparation of the polymer coating: polyethylene is selected as a binder, dimethyl sulfoxide and tetrahydrofuran are used as solvents, ethylene carbonate is used as a plasticizer, and titanium dioxide is selected as oxide particles. The oxide parti...

Embodiment 3

[0041] Using radio frequency magnetron sputtering technology, using crystalline silicon-tin sputtering target and graphite target as target materials, 5 μm Si-Sn composite thin film layer 2, 5 μm carbon layer 5, and 5 μm copper foil 1 are sequentially deposited on the copper foil 1 with a thickness of 15 μm. Si-Sn composite film layer 2, carbon layer 5 of 1 μm (see image 3 ), forming a semi-finished product with a negative electrode material layer. When depositing the Si-Sn composite film layer 2, the sputtering power of the Si-Sn target is 850W, the flow rate of the gas Ar is 52sccm, wherein the atomic ratio of Si:Sn is 100:25; when depositing the carbon layer, the sputtering power is 400W , the gas Ar flow rate is 36 sccm.

[0042]Preparation of the polymer coating: polymethyl methacrylate is selected as a binder, acetone and methanol are used as solvents, propylene carbonate is used as a plasticizer, and oxide particles are selected from aluminum oxide. The oxide particl...

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Abstract

The invention discloses a multilayer-film negative pole shoe and a making method thereof. The multilayer-film negative pole shoe comprises a metal substrate; at least one layer of amorphous carbon film and at least one layer of doped silicon film are deposited on the metal substrate by using a magnetron sputtering technology; the doped silicon film is externally coated with a layer of polymer coating; the metal substrate can a copper sheet or a aluminum sheet; doped elements in the doped silicon film can be one or more of aluminum, copper, ferrum, tin and boron; the total thickness of the amorphous carbon film and the doped silicon film is 5-20 mu m; and the thickness of the polymer coating is 10-50 mu m. In the multilayer-film negative pole shoe disclosed in the invention, multiple layers of doped silicon film and amorphous carbon film are deposited on the metal substrate alternately by using the magnetron sputtering technology, the thickness of negative pole material films is thinner, bonding force between active material silicon and the doped elements is higher, and batteries made from the multilayer-film negative pole shoe have excellent properties in charge and discharge capacities, current density, discharge capability and cycle performance; the polymer coating is coated directly, thereby omitting a special diaphragm of a traditional battery, reducing cost, improving production efficiency, lessening electrolyte flowing internally and improving the safety performance of the battery. The multilayer-film negative pole shoe can be applied to a solid lithium ion battery and a liquid lithium ion battery.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a multi-layer film negative pole piece for a lithium-ion battery and a manufacturing method thereof. Background technique [0002] With the shrinking size of portable electronic devices, there are higher requirements for high energy density and high power density of batteries, requiring batteries to be lighter in weight, higher in energy storage capacity, and better in charging and discharging performance. [0003] Lithium-ion batteries are divided into liquid lithium-ion batteries and solid-state lithium-ion batteries. Liquid lithium-ion batteries use liquid electrolytes, and solid-state lithium-ion batteries use gel-like electrolytes. As a new generation of lithium-ion batteries, solid-state lithium-ion batteries have superior electrochemical performance and better safety performance. Because solid-state lithium-ion batteries have sufficient flexibility in shape design and adapt to a w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/62H01M4/1393
CPCY02E60/10
Inventor 吴宁宁徐金龙李永伟王雅和葛焕增蔡春华
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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