Composite solid electrolyte material and preparation method and application thereof

A technology of solid electrolyte and electrolyte material, which is applied in the field of -zBN composite solid electrolyte material and its preparation, can solve the problems of low room temperature conductivity, unsatisfactory stability and electrode compatibility, low ionic conductivity, etc., and achieve improved ionic conductivity. The effect of conductivity, good compatibility and electrochemical stability, and strong lithium dendrite suppression ability

Pending Publication Date: 2022-05-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxide- and sulfide-based solid-state electrolytes have similar or slightly lower ionic conductivity than liquid electrolytes, but the stability and electrode compatibility cannot meet the requirements of all-solid-state lithium batteries
LiBH 4 Is a coordination metal hydride, which has a wide electrochemical window as a solid electrolyte and is compatible with most electrodes, the main disadvantage is the low room temperature conductivity (-7 S cm -1 )

Method used

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  • Composite solid electrolyte material and preparation method and application thereof
  • Composite solid electrolyte material and preparation method and application thereof
  • Composite solid electrolyte material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) In the isolation of air (H 2 O2 <1ppm), put 0.5g of hexagonal boron nitride into a stainless steel spherical tank equipped with stainless steel grinding balls; use a planetary wheel ball mill mechanical ball milling method, under the protection of high-purity (99.9999%) inert gas (argon) Next, hexagonal boron nitride with amorphous structure was obtained. The volume of the ball mill jar is 100 ml, the weight ratio of the balls to the sample is 40:1, the milling time is 10 hours, and the revolution speed is set at 500 rpm.

[0048] (2) Calculate the mass of hexagonal boron nitride and lithium borohydride with amorphous structure according to the molar ratio of 1:1, 1:2 and 1:3 respectively, weigh them and put them into a spherical tank with stainless steel grinding balls again The mixture of hexagonal boron nitride and lithium borohydride containing amorphous structure is obtained by adopting the mechanical ball milling method of planetary wheel ball mill under the ...

Embodiment 2

[0050] (1) In the isolation of air (H 2 O2 <1ppm), put 0.5g of hexagonal boron nitride into a stainless steel spherical tank equipped with stainless steel grinding balls; use a planetary wheel ball mill mechanical ball milling method, under the protection of high-purity (99.9999%) inert gas (argon) Next, hexagonal boron nitride with amorphous structure was obtained. The volume of the ball mill jar is 100 ml, the weight ratio of the ball to the sample is 45:1, the milling time is 20 hours, and the revolution speed is set to 450 rpm

[0051] (2) In the isolation of air (H 2 O2 4 Put it into a stainless steel spherical tank equipped with stainless steel grinding balls; adopt a planetary wheel ball mill mechanical ball milling method, under the protection of high-purity (99.9999%) inert gas (argon), to obtain LiBH 4 Mixture with LiI. The volume of the ball mill jar is 100 ml, the weight ratio of the balls to the sample is 40:1, the milling time is 4 hours, and the revolution sp...

Embodiment 3

[0054] Get the LiBH prepared in Example 1 4 -zBN, z=1,2,3 and embodiment 2 prepare (3LiBH 4 -LiI)-zBN, z=1, 2, 3, 4, 5 for X-ray diffraction (XRD) experiments, the sample cell is covered by a specific polymer film, and it is sealed with a glass slide with vacuum grease to prevent air The effect of water and oxygen on the sample. The target material of the X-ray source used is a Cu target, the tube voltage is 40kV, and the tube current is 40mA.

[0055] see figure 1 and figure 2 , LiBH after ball milling and heat treatment 4 -zBN complex (z=1,2,3), the pre-milled h-BN phase peak position did not change, and the peak intensity was weakened compared with that before ball milling, indicating that there was some amorphization; LiBH 4 The same peak position does not change, and the peak intensity weakens, indicating that there is also some amorphization. The product has no mesophase formation, indicating that LiBH 4 There is no interaction with h-BN and no self-decomposition...

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Abstract

The invention discloses a composite solid electrolyte material and a preparation method and application thereof. The electrolyte material has an amorphous and heterojunction mixed interface. The chemical composition is (xLiBH4-yLiI)-zBN, x, y and z are molar ratios, 1 < = x < = 5, 0 < = y < = 5, and 1 < = z < = 5. The preparation method comprises the following steps: in an inert gas atmosphere, firstly carrying out pre-ball milling on a certain amount of h-BN, then mixing the h-BN with xLiBH4-yLiI according to a certain molar ratio, then carrying out ball milling, and then carrying out heat treatment under a certain hydrogen pressure. The material disclosed by the invention has excellent room-temperature ionic conductivity, a wide electrochemical window, high lithium ion mobility, almost negligible electronic conductivity, excellent electrode compatibility, extremely strong lithium dendrite inhibition capability and excellent all-solid-state battery performance. The material is a lithium ion conductor with excellent performance at room temperature (T is less than 100 DEG C), and can be used as a solid electrolyte of an all-solid-state lithium ion battery.

Description

technical field [0001] The invention belongs to solid electrolyte materials, in particular to a (xLiBH) with amorphous and heterojunction interfaces 4 -yLiI)-zBN composite solid electrolyte material and its preparation method and application. Background technique [0002] Lithium-ion secondary batteries have been widely used for their high energy and power density, long life, and environmental protection, especially in electric vehicles and portable devices. Conventional Li-ion batteries tend to use organic liquid electrolytes with high ionic conductivity, but cause reversible capacity fading and serious safety concerns due to their volatility, flammability, and easy formation of Li dendrites. These issues have long hindered the development of lithium batteries. The use of solid electrolytes can improve the safety and performance of lithium batteries, and replacing the electrolyte and diaphragm in traditional lithium batteries can achieve system simplification and efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0068Y02E60/10
Inventor 张耀吴子强
Owner SOUTHEAST UNIV
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