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Lithium ion battery made of shape-memory alloy composite materials and preparation method thereof

A lithium-ion battery and memory alloy technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of battery performance degradation, volume expansion, and shortened life, and achieve improved battery efficiency, simple operation, and wide application range wide effect

Inactive Publication Date: 2014-11-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional lithium-ion batteries use graphite as the anode material, but the limited lithium storage capacity of graphite can no longer meet the needs of the development of high-capacity lithium-ion batteries. Therefore, the research and development of various new anode materials (such as tin-based materials, silicon-based materials, etc.) Especially important, but new anode materials such as tin-based and silicon-based materials will experience significant volume expansion during charging, resulting in problems such as high-density dislocations and macroscopic defects. These changes are usually the root cause of battery performance degradation and shortened life.

Method used

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  • Lithium ion battery made of shape-memory alloy composite materials and preparation method thereof
  • Lithium ion battery made of shape-memory alloy composite materials and preparation method thereof
  • Lithium ion battery made of shape-memory alloy composite materials and preparation method thereof

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Embodiment 1

[0033] This embodiment provides a method using Ti 3 A lithium ion battery made of Sn / TiNi, which is prepared by the following steps:

[0034] (1) Press Ti 3 The composition distribution ratio of the Sn / TiNi memory alloy composite material Ti:Sn:Ni=4:1:1 (atomic ratio) selects elemental titanium, elemental nickel, and elemental tin with a purity of more than 99.9wt.%.

[0035] Put elemental titanium, elemental nickel, and elemental tin into a smelting furnace protected by argon at -0.5MPa, and melt to prepare Ti 3 Sn / TiNi shape memory alloy composite material; in a vacuum furnace, the smelted ingot is subjected to homogenization annealing at 950°C for 10h; the annealed ingot is cold-rolled, and annealed at 950°C for several times in the middle to obtain Ti 3 Sn / TiNi shape memory alloy composite sheet;

[0036] (2) further wire-cut and mechanically polish the plate into thin slices with a diameter of 5 mm and a thickness of 0.5 mm to make an anode of a lithium-ion battery; T...

Embodiment 2

[0040] This embodiment provides a method using Ti 2 A lithium ion battery made of Sn / TiNi, which is prepared by the following steps:

[0041] (1) Press Ti 2 The composition distribution ratio of the Sn / TiNi memory alloy composite material Ti:Sn:Ni=3:1:1 (atomic ratio) selects elemental titanium, elemental nickel, and elemental tin with a purity above 99.9wt.%.

[0042] Put elemental titanium, elemental nickel, and elemental tin in a vacuum higher than 10 -1 In the smelting furnace of Pa, it is smelted and prepared into Ti 2 Sn / TiNi shape memory alloy composite material; in a vacuum furnace, the smelted ingot is subjected to homogenization annealing at 950°C for 10h; the annealed ingot is cold-rolled, and annealed at 950°C for several times in the middle to obtain Ti 2 Sn / TiNi shape memory alloy composite sheet;

[0043] (2) Put Ti 2 The Sn / TiNi memory alloy composite sheet is further wire-cut and mechanically polished into a thin sheet with a diameter of 8mm and a thickn...

Embodiment 3

[0045] This embodiment provides a method using Ti 5 sn 3 / Li-ion battery made of TiNi, which is prepared by the following steps:

[0046] (1) Press Ti 5 sn 3 The composition distribution ratio Ti of / TiNi memory alloy composite material: Sn: Ni=6: 3: 1 (atomic ratio) selects elemental titanium, elemental nickel, elemental tin with purity more than 99.9wt.%.

[0047] Put elemental titanium, elemental nickel, and elemental tin into a smelting furnace under the protection of argon at -0.5MPa, and melt to prepare Ti 5 sn 3 / TiNi shape memory alloy composite material; in a vacuum furnace, the smelted ingot is subjected to homogenization annealing at 950°C for 10 hours; the annealed ingot is cold-rolled, and the middle is annealed at 950°C for multiple times to obtain Ti 5 sn 3 / TiNi shape memory alloy composite sheet;

[0048] (2) For Ti 5 sn 3 / TiNi memory alloy composite material plate is further wire-cut and mechanically polished into thin slices with a diameter of 10mm...

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Abstract

The invention relates to a lithium ion battery made of shape-memory alloy composite materials and a preparation method thereof. An anode of the lithium battery is made of the shape-memory alloy composite material of manganese (M) or titanium nickel (TiNi), a cathode is made of metal lithium or lithium cobaltate, and electrolyte is liquid electrolyte or solid electrolyte used for the lithium ion battery. The preparation method of the lithium ion battery is further provided. The shape-memory alloy composite materials are adopted to compound with tin-base and silicon-base high capacity density anode materials, so electrode materials are prevented from being cracked and smashed during charge and discharge processes by means of shape-memory effect of shape-memory alloy and large size changes of the tin-base and silicon-base high capacity density anode materials during the charge process.

Description

technical field [0001] The invention relates to a lithium ion battery made of a shape memory alloy composite material and a preparation method thereof, belonging to the technical field of lithium ion battery preparation. Background technique [0002] In recent years, as the world's energy and environmental crises have intensified, people increasingly need to develop new energy materials to replace traditional energy materials such as oil, coal, and natural gas that are widely used today. In the field of new energy research, lithium-ion batteries are developing rapidly and are considered to be one of the most ideal green energy sources in the 21st century. Lithium-ion battery is a secondary battery that can be repeatedly charged and discharged. Its work mainly depends on the drift of lithium ions between the cathode and the anode. When charging, lithium ions are deintercalated from the cathode and intercalated into the anode through the electrolyte, making the anode in a lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 张利强崔立山张俊松姜大强邵阳郭云鹏
Owner CHINA UNIV OF PETROLEUM (BEIJING)