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Electrolyte material for all solid-state lithium secondary battery, preparation method for electrolyte material and all solid-state lithium secondary battery

A technology for lithium secondary batteries and electrolyte materials, which is applied in the field of all-solid-state lithium secondary batteries, can solve the problems that the conductivity needs to be further improved and the conductivity of lithium ions is not high, so as to improve the electrochemical stability and improve the conductivity of lithium ions. , the effect of reducing the boundary resistance

Active Publication Date: 2014-02-05
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium ion conductivity of the above solid electrolyte materials is still not high at room temperature, and its conductivity needs to be further improved.

Method used

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  • Electrolyte material for all solid-state lithium secondary battery, preparation method for electrolyte material and all solid-state lithium secondary battery
  • Electrolyte material for all solid-state lithium secondary battery, preparation method for electrolyte material and all solid-state lithium secondary battery
  • Electrolyte material for all solid-state lithium secondary battery, preparation method for electrolyte material and all solid-state lithium secondary battery

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preparation example Construction

[0038] The invention provides a method for preparing an electrolyte material for an all-solid lithium secondary battery, comprising:

[0039] Will Li 2 S, P 2 S 5 Grinding after mixing with the dopant, the grinding time is at least 5 hours to obtain an all-solid lithium secondary battery electrolyte material;

[0040] The dopant is the III, IV, V, VI and VII main group non-metal element compounds of lithium, and the III, IV, V, VI and VII main group non-metal element compounds One or more of the compounds formed by at least two elements.

[0041] The method provided by the invention uses Li 2 S, P 2 S 5 and dopant as raw materials to prepare an all-solid lithium secondary battery electrolyte material, which belongs to the binary sulfide electrolyte material, has high lithium ion conductivity at room temperature, and has excellent conductivity.

[0042] In the present invention, the Li 2 S and P 2 S 5 After mixing, grinding can form a glass-ceramic system, that is, a ...

Embodiment 1

[0067] According to the molar ratio of 1:0.4:0.01, weigh Li with a purity of more than 99%. 2 S, P 2 S 5 with Li 3 N: Under the protection of an argon atmosphere, the above raw materials are mixed and ground under the condition that the water content is less than 100ppm, and then ball milled by a high-energy ball mill for 40 hours to obtain the initial material;

[0068]Take out the primary material, grind it evenly, and press it into tablets with a pressure of 10 MPa, then put the obtained flake primary material into a quartz glass tube, vacuumize it until the vacuum degree is less than 100Pa, and seal it with a hydrogen-oxygen flame. Then heat the quartz glass tube containing the above mixture to 270 °C at a heating rate of 2 °C / min, keep it warm for 4 hours, and after cooling to room temperature with the furnace, open the tube under the condition of water content of 100 ppm and grind it evenly again, then again Put it into a quartz glass tube, evacuate it until the vacuu...

Embodiment 2

[0077] According to the molar ratio of 1:0.4:0.01, weigh Li with a purity of more than 99%. 2 S, P 2 S 5 and LiI; under the protection of an argon atmosphere, the above raw materials are mixed under the condition that the water content is less than 100ppm, and then ground, and then ball milled by a high-energy ball mill for 40 hours to obtain the initial material;

[0078] Take out the primary material, grind it evenly, and press it into tablets with a pressure of 10 MPa, then put the obtained flake primary material into a quartz glass tube, vacuumize it until the vacuum degree is less than 100Pa, and seal it with a hydrogen-oxygen flame. Then heat the quartz glass tube containing the above mixture to 250 °C at a heating rate of 2 °C / min, keep it warm for 2 hours, and after cooling to room temperature with the furnace, open the tube under the condition of water content of 0.1 ppm and grind it evenly again to obtain Electrolyte materials for all-solid-state lithium secondary ...

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Abstract

The invention provides an electrolyte material (LiaPbScMd) for an all solid-state lithium secondary battery and a preparation method for the electrolyte material. The electrolyte material, shown in a formula (I) LiaPbScMd, for the all solid-state lithium secondary battery is prepared from Li2S, P2S5 and a dopant, wherein the dopant is selected from one or more of compounds of nonmetal elements in main groups III, IV, V, VI and VII of lithium and compounds formed from at least two of the nonmetal elements in the main groups III, IV, V, VI and VII; in the formula (I), M is selected from one or more of the nonmetal elements in the main groups III, IV, V, VI and VII, a is more than 0 and less than or equal to 10, b is more than 0 and less than or equal to 5, c is more than 0 and less than or equal to 15, and d is more than 0 and less than 1. The electrolyte material for the all solid-state lithium secondary battery has high electrical conductivity, high electrochemical stability and the like, and is favorable for application. The invention also provides the all solid-state lithium secondary battery.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to an electrolyte material for an all-solid lithium secondary battery, a preparation method thereof, and an all-solid lithium secondary battery. Background technique [0002] Because lithium secondary batteries have many advantages such as large output power, high energy density, long service life, high average output voltage, small self-discharge, no memory effect, fast charge and discharge, excellent cycle performance and no environmental pollution, it has become It is the first choice of rechargeable power source for portable electronic products today, and it is also considered to be the most competitive vehicle power battery. Therefore, at present, lithium secondary batteries have entered thousands of households and become an inseparable part of society. In general, lithium secondary batteries mainly include liquid lithium secondary batteries and solid lithi...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0562H01M10/058H01M2300/0068Y02E60/10Y02P70/50
Inventor 许晓雄邱志军彭刚官亦标金翼
Owner STATE GRID CORP OF CHINA
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