Lithium ion solid conductor, preparation method thereof and all-solid lithium battery

A lithium-ion, solid-state technology, used in secondary batteries, circuits, electrical components, etc., can solve problems such as poor stability of metal lithium, dead lithium", and limited development and application

Inactive Publication Date: 2018-11-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fundamentally speaking, when lithium metal is used as the negative electrode of secondary batteries, the main problems are: (1) the low charge-discharge cycle efficiency and the continuous increase of interface impedance caused by complex interfacial reactions; (2) "dendrites" and The production of "dead lithium", the safety problems and the loss of electrode active materials
At present, the conductivity of the widely used sulfide solid electrolyte is still generally low, and its stability to metal lithium is not good, which greatly limits its development and application in the next generation of high-energy lithium batteries.

Method used

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  • Lithium ion solid conductor, preparation method thereof and all-solid lithium battery
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  • Lithium ion solid conductor, preparation method thereof and all-solid lithium battery

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preparation example Construction

[0041] The present invention also provides a preparation method of a lithium ion solid conductor, comprising the following steps:

[0042] A) will Li 2 S, P 2 S 5 , LiCl and LiBr are weighed according to the stoichiometric ratio in formula 1, and then high-energy ball milling is carried out to obtain the initial powder;

[0043] Li 6 P.S. 5 Cl z m 1-z Formula 1;

[0044] In formula 1, M is Br or I; 0.1≤z<1;

[0045] B) Sintering the primary powder material to obtain a lithium ion solid conductor.

[0046] In the present invention, with reference to the stoichiometric ratio in formula 1, Li with a purity of 99% or more 2 S, P 2 S 5 , LiCl and LiM (M=Br, I) are weighed according to the molar ratio x:y:z:(1-z), wherein, 2x+z+(1-z)=6; x+5y=5; Z=0 ~1. After weighing, the above-mentioned raw materials are subjected to high-energy ball milling under the condition that the water content is less than 10 ppm to obtain powdery raw materials.

[0047] The rotational speed o...

Embodiment 1～8

[0058] Under the protection of argon atmosphere, Li with a purity of more than 99% 2 S, P 2 S 5 , LiCl, and LiBr are weighed according to the molar ratio x:y:z:(1-z), wherein, 2x+z+(1-z)=6; x+5y=5; Z=0.2, 0.4, 0.5, 0.6 , 0.75, 0.8, 0.85, 1. Under the condition that the water content is less than 10ppm, at 350rpm; the time of high-energy ball milling is 15h; the ball-to-material ratio of high-energy ball milling is preferably 45:1. Finally, the primary powder material is obtained, and the primary powder material is taken out, grinded evenly, and then pressure-pressed to obtain a sheet-shaped primary material, and the sheet-shaped primary material is loaded into a sintering mold. Heat the sintering mold with the above flake raw material to the set temperature of 550°C at a heating rate of 2°C / min, keep it warm for 4h, cool down to room temperature with the furnace, take out the flake sintered product and grind it under the condition that the water content is less than 100ppm ...

Embodiment 9～16

[0063] Under the protection of argon atmosphere, Li with a purity of more than 99% 2 S, P 2 S 5 , LiCl, and LiI are weighed according to the molar ratio x:y:z:(1-z), wherein, 2x+z+(1-z)=6; x+5y=5; Z=0.2, 0.4, 0.5, 0.6 , 0.75, 0.8, 0.85, 1. Under the condition that the water content is less than 10ppm, at 350rpm; the time of high-energy ball milling is 15h; the ball-to-material ratio of high-energy ball milling is preferably 45:1. Finally, the primary powder material is obtained, and the primary powder material is taken out, grinded evenly, and then pressure-pressed to obtain a sheet-shaped primary material, and the sheet-shaped primary material is loaded into a sintering mold. Heat the sintering mold with the above flake raw material to the set temperature of 550°C at a heating rate of 2°C / min, keep it warm for 4h, cool down to room temperature with the furnace, take out the flake sintered product and grind it under the condition that the water content is less than 100ppm ...

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Abstract

The invention provides a lithium ion solid conductor. The lithium ion solid conductor has a chemical formula (1) as follows: Li6PS5ClzM1-z, wherein M is Br or I, and z is more than or equal to 0.1 butless than 1. In order to solve the problems of widespread chemical instability between an inorganic lithium ion solid conductor material and metal lithium and lower conductivity of lithium ions, thelithium ion solid conductor provided by the invention is characterized in that the chlorine element in a sulfide electrolyte Li6PS5Cl is replaced by the doped halogen elements (Br, I) with larger atomic radiuses so as to acquire a novel sulfide electrolyte Li6PS5ClzM1-z, wherein M is Br or I and z is more than or equal to 0.1 and less than or equal to 1. A lithium ion transmission channel is widened, a multi-dimensional lithium ion transmission channel is formed, an activity space is increased and the conductivity of the lithium ions is promoted. The invention also provides a preparation method for the lithium ion solid conductor and an all-solid lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion solid conductor, a preparation method thereof and an all-solid lithium battery. Background technique [0002] Lithium secondary batteries are widely used in daily life with many advantages such as large output power, high energy density, excellent cycle performance, no memory effect and no environmental pollution. The most competitive vehicle power battery. At present, lithium-ion batteries with graphite as the negative electrode have been widely used in various electronic products. However, the theoretical specific capacity of graphite is only 372mAh / g, and there is a large irreversible capacity loss during the first charge and discharge process, so it is difficult to become a battery with high specific energy. Anode materials for secondary batteries. With the continuous development of science and technology and the urgent need for high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0085Y02E60/10
Inventor 陈少杰吴林斌姚霞银许晓雄
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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