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A composite electrode material, its preparation method and all-solid-state lithium battery

A composite electrode and electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrochemical performance of all-solid-state lithium batteries

Active Publication Date: 2018-07-17
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrochemical performance of existing all-solid-state lithium batteries using inorganic solid-state electrolytes is poor

Method used

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  • A composite electrode material, its preparation method and all-solid-state lithium battery
  • A composite electrode material, its preparation method and all-solid-state lithium battery
  • A composite electrode material, its preparation method and all-solid-state lithium battery

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preparation example Construction

[0071] The invention provides a kind of preparation method of composite electrode material, comprises the following steps:

[0072] A) mixing raw materials and electrode materials for synthesizing the sulfide electrolyte in a solvent, and reacting to obtain a reaction mixture, the chemical formula of the sulfide electrolyte is one or more of formulas (I) to (III);

[0073] aLi 2 S·(100-a-c)X b S n cY (I);

[0074] 03+ ,P 3+ ,P 5+ 、Si 4+ or Ge 4+ , Y is LiI, LiBr, Li 3 PO 4 , Li 4 SiO 4 ,P 2 o 5 、GeS 2 or P 2 S 3 ;

[0075] Li 10+a′ X' 1+a′ P 2-a′ S 12 (II);

[0076] X' is selected from one or more of the elements of the third, fourth or fifth main group;

[0077] 0≤a'≤1;

[0078] Li 4-a″ X″ 1-b′ Y' b′ S 4 (III);

[0079] X" is selected from one of Si and Ge, and Y' is selected from one of P, Al, Zn and Ga;

[0080] -1≤a″≤2, 0≤b′≤1;

[0081] B) the reaction mixture obtained in step A) is subjected to vacuum distillation to obtain a solid product;...

Embodiment 1

[0099] In a glove box filled with argon atmosphere, first weigh 0.5g of cobalt sulfide according to the coating mass ratio of 15:85, and then weigh it according to Li 2 S and P 2 S 5 The molar ratio of substances is 7:3 and weigh 0.0287g of Li in turn 2 S and 0.0595g of P 2 S 5 . Add 20 mL of acetonitrile solvent. The raw material and the solvent are sealed in a quartz reaction bottle for reaction. Place the sealed reaction bottle on a magnetic heating stirrer and stir at 50° C. for 24 h at a stirring rate of 400 r / min.

[0100] After the reaction, the solvent was distilled off under reduced pressure at 60° C. using a vacuum pump, and then dried in an oven at 80° C. for 12 hours. The dried composite electrode material was ground into powder with a mortar and transferred to Al 2 o 3 Finally, the crucible was placed in a muffle furnace and sintered in an argon atmosphere. The heating rate was 5°C / min, the sintering temperature was 260°C, and the sintering time was 1h. A...

Embodiment 2

[0105] In a glove box filled with argon atmosphere, first weigh 0.5g LiCoO according to the coating mass ratio of 15:85 2 , and then according to Li 2 S and P 2 S 5 The molar ratio of substances is 7:3 and weigh 0.0287g of Li in turn 2 S and 0.0595g of P 2 S 5 . Add 20 mL of acetonitrile solvent. The raw material and the solvent are sealed in a quartz reaction bottle for reaction. Place the sealed reaction bottle on a magnetic heating stirrer and stir at 50° C. for 24 h at a stirring rate of 400 r / min.

[0106] After the reaction, the solvent was distilled off under reduced pressure at 60° C. using a vacuum pump, and then dried in an oven at 80° C. for 12 hours. The dried composite electrode material was ground into powder with a mortar and transferred to Al 2 o 3 Finally, the crucible was placed in a muffle furnace for sintering under a nitrogen atmosphere, wherein the heating rate was 5°C / min, the sintering temperature was 260°C, and the sintering time was 1h. Aft...

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Abstract

The invention provides a composite electrode material, which comprises an electrode material and a sulfide electrolyte, wherein the sulfide electrolyte coats the electrode material; and a chemical formula of the sulfide electrolyte is one or more of formulas (I) to (III). The sulfide electrolyte coats the surface of the electrode material, so that the interface problem of ion transportation between an electrolyte interface and an electrode interface can be effectively improved by the structure; the transmission efficiency of lithium ions on the surface of the electrode material is improved; the ion transportation resistance between the electrolyte interface and the electrode interface is reduced to improve the cycle performance and the rate capability of the electrode material. An experiment result shows that the specific capacity of an all-solid-state lithium battery assembled by the composite electrode material provided by the invention is reduced to about 550mAhg<-1> from initially about 600mAhg<-1> after 50 charge-discharge cycles; and the descending degree is small, and explains that the electrochemical properties of the battery can be effectively improved by the composite electrode material provided by the invention.

Description

technical field [0001] The invention belongs to the field of all-solid lithium batteries, and in particular relates to a composite electrode material, a preparation method thereof and an all-solid lithium battery. Background technique [0002] Lithium-ion batteries have been successfully used as the main energy storage device in the field of mobile power because of their high output voltage, large specific energy, long cycle life, good safety performance, and no memory effect. Traditional lithium-ion rechargeable batteries use organic electrolyte, but overcharging, internal short circuit and other abnormalities may cause the electrolyte to heat up, and there is a risk of spontaneous combustion or explosion. The organic electrolyte is replaced by a solid electrolyte to form an all-solid state lithium battery. All-solid-state lithium batteries are safer and have a longer service life than traditional lithium batteries using organic electrolytes. [0003] At present, the rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/366H01M4/5815H01M10/0525Y02E60/10
Inventor 姚霞银许晓雄刘登龙鹏彭刚
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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