High-performance all-solid-state lithium-ion battery and preparation method thereof

A lithium-ion battery and all-solid-state technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of daily use of large-capacity power batteries and the difficulty in satisfying the electrochemical performance of all-solid-state lithium-ion batteries. , to achieve the effects of high energy density, high safety, and simple preparation method

Active Publication Date: 2016-06-15
李震祺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a high-performance all-solid-state lithium-ion battery and its preparation method, aiming to solve the problem that the electrochemical performance of the existing all-solid-state lithium-ion battery is difficult to meet the needs of daily use and large The development of the field of capacity power battery is limited

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  • High-performance all-solid-state lithium-ion battery and preparation method thereof

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Embodiment 1

[0040] Lithium iron phosphate, lithium superionic conductor Li 10 GeP2 S 12 , conductive carbon, high molecular polymer PEO according to the mass ratio of 80%: 10%: 5%: 5%, respectively weighed 240g, 30g, 15g, 15g and vacuum stirred in 540g benzene to form a positive electrode mixed slurry, which was coated on the treated on the aluminum foil, dried and pressed into a positive sheet.

[0041] The mixture of molten lithium metal and hot silicone oil at 200°C is stirred at a high speed of 20,000r / min to form a uniform emulsion, then cooled to room temperature, filtered, washed, and dried naturally to obtain lithium powder with a particle size of 23-58 μm; According to the theoretical capacity of lithium, 5% excess negative electrode capacity was used for matching, and 9.88g lithium powder and 1.85g lithium superionic conductor Li 10 GeP 2 S 12 , 0.62g of high molecular polymer PEO was vacuum stirred in 22.23g of benzene to form a negative electrode mixed slurry, which was co...

Embodiment 2

[0045] The binary material lithium nickel cobalt oxide, lithium superionic conductor Li 10 SnP 2 S 12 , conductive carbon, polymer PAN according to the mass ratio of 80%: 8%: 8%: 4%, respectively weighed 240g, 24g, 24g, 12g and vacuum stirred in 300g acetonitrile to form a positive electrode mixed slurry, which was coated on the treated on the aluminum foil, dried and pressed into a positive sheet.

[0046] The mixture of molten lithium metal and hot silicone oil at 200°C is stirred at a high speed of 25,000r / min to form a uniform emulsion, then cooled to room temperature, filtered, washed, and dried naturally to obtain lithium powder with a particle size of 21-46 μm; According to the theoretical capacity of lithium, 5% excess negative electrode capacity was used for matching, and 10.58g of lithium powder and 1.49g of lithium superionic conductor Li 10 SnP 2 S 12 1. 0.37g of high molecular polymer PAN was vacuum stirred in 12.45g of acetonitrile to form a negative electro...

Embodiment 3

[0050] The ternary nickel cobalt lithium manganese oxide, lithium superionic conductor Li 10 GeP 2 S 12 , conductive carbon, high molecular polymer PEO according to the mass ratio of 80%: 5%: 10%: 5%, respectively weighed 240g, 15g, 30g, 15g and vacuum stirred in 450g dimethylformamide to form a positive electrode mixed slurry, coated Spread it on the treated aluminum foil, dry it, and press it into a positive electrode sheet.

[0051] The mixture of molten lithium metal and hot silicone oil at 250°C is stirred at a high speed of 25,000r / min to form a uniform emulsion, then cooled to room temperature, filtered, washed, and dried naturally to obtain lithium powder with a particle size of 19-40μm; According to the theoretical capacity of lithium, 5% excess negative electrode capacity was used for matching, and 10.54g of lithium powder and 1.24g of lithium superionic conductor Li 10 GeP 2 S 12 1. 0.62g of high molecular polymer PEO was vacuum stirred in 18.60g of dimethylfor...

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Abstract

The invention discloses a high-performance all-solid-state lithium-ion battery and a preparation method thereof. The preparation method of the all-solid-state lithium-ion battery solves the problem of hard contact between an electrolyte and an electrode interface, improves the activation degree of the electrolyte and an electrode material, reduces electrochemical polarization and obviously reduces the internal resistance of the battery. A lithium superionic conductor-modified polymer electrolyte penetrates through an overall all-solid-state lithium-ion battery system, improves the transmission rate of lithium ions and improves the high-rate charge-discharge capability of the all-solid-state lithium-ion battery. A high-molecular polymer which is the same as the electrolyte is utilized for coating a positive plate and a negative plate as a binder, so that the diffusion path of the lithium ions is shortened; capacity development of active materials is facilitated; the specific energy of the battery is significantly improved and reaches 763Wh/Kg; meanwhile, uneven charging and discharging of a negative lithium metal are alleviated by the high-molecular polymer; growth of lithium crystal is inhibited; the service lifetime is prolonged; and the high-performance all-solid-state lithium-ion battery can be recycled over 1,000 times.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-performance all-solid-state lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and long service life, and have been widely used in portable electronic devices, power tools, electric bicycles and other fields. However, lithium-ion batteries still have some urgent problems in large-scale battery applications such as automobiles and energy storage: safety, service life, energy density, etc. [0003] The development of all-solid-state lithium-ion batteries and the use of solid electrolytes to replace volatile, flammable, and explosive organic electrolytes are the fundamental way to solve battery safety problems. In addition, all-solid-state lithium-ion batteries will also have a large room for development in terms of improving battery energy density, broadening the opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M4/62H01M10/058H01M10/0525
CPCH01M4/622H01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 李震祺刘立君宋翠环
Owner 李震祺
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