TiS2 composite positive electrode and all-solid-state battery device

An all-solid-state battery, composite cathode technology, applied in electrical components, battery electrodes, secondary batteries, etc., can solve the problems of low cycle times, low electronic conductivity of positive active materials, low ionic conductivity, etc., and achieve ultra-long cycles. The effect of capacity and life, good lithium supplementation and moisture absorption, high ionic conductivity

Pending Publication Date: 2022-05-06
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD +2
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Problems solved by technology

According to the theory of soft and hard acids and bases, the sulfide electrolyte containing P element has poor air stability, and it is easy to react with moisture and oxygen in the air, accompanied by the generation of toxic hydrogen sulfide gas, which destroys the structure of the electrolyte itself, and the chemical composition Changes occur, accompanied by irreversible changes in structure and performance, which lead to a sharp deterioration in its ionic conductivity and other properties
The extremely poor air stability of sulfide solid-state electrolytes affects the production, storage, and transportation of sulfide solid-state electrolyte materials, and the production, manufacture, and use of sulfide all-solid-state batteries, severely restricting its output and increasing the production and production costs. The difficulty of processing limits its large-scale application in all-solid-state lithium batteries and increases the cost of production and processing
The idea of ​​the existing technical solution is to dope and modify the material to improve the ion conductivity or the stability of the wet air or the stability to metal lithium, such as Li 6 P.S. 5 The ionic conductivity of I is only 10 -6 On the order of S/cm, materials doped with a series of elements such as In, Si, Ge, Sn, F, etc., generally have an ion conductivity of 10 -5 -10 -4 S/cm level, up to 1.1×10 -3 S/cm, it is difficult to reach 10 -2 S/cm
[0004] Sulfide solid electrolyte without P element, such as Li 4 GeS 4 , Li 4 SnS 4 , Li 3 Sb 4 etc., although they have high air stability, they have the following problems: (1) the ionic conductivity is generally very low, far below 1mS/cm; (2) due to the high-valent metal ions, the electrochemical reduction is stable (3) Due to the generation of electronic and ion-conducting alloy by-products, it is impossible to form a kinetically stable interface passivation layer with metallic lithium, resulting in a continuous increase in interface impedance and deterioration of battery performance (rapid capacity decay)
[0005] At the level of solid-state battery devices, it is limited by the low room temperature

Method used

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[0049] The invention will be further explained by the following drawings and specific examples, but it should be understood that these examples are only for more detailed explanation, and should not be construed as limiting the invention in any way, that is, not intended to limit the scope of protection of the invention.

[0050] 1. Development of sulfide solid electrolyte

[0051] At first, the invention developed a new sulfide solid electrolyte material of sulfur-silver-germanium ore system without P element, Li 7+y-z M y As 1-y S 6-z X z (M=Si、Ge、Sn、Ti、Zr,X=F、Cl、Br、I,0≤y≤1,0≤z≤2)。 The ionic conductivity of the material can be increased to 10. -2 S / cm or more, the wet air is stable (the hydrogen sulfide production is low, and the structure and properties can be recovered by heating), and at the same time, the in-situ lithium replenishing agent (Li 2 S, LiI), which is different from the lithium-supplementing material added separately, can improve the first-week coulombic efficien...

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Abstract

The invention provides a TiS2 composite positive electrode and an all-solid-state battery device, a sulfide solid electrolyte with lithium supplement and moisture absorption effects is adopted, TiS2 is used as a positive electrode active material, the sulfide solid electrolyte has the following chemical composition: Li < 7 + y-z > MyAs < 1-y > S < 6-z > X < z >, M is at least one of Si, Ge, Sn, Ti and Zr, X is a halogen element, y is more than or equal to 0 and less than or equal to 1, and z is more than or equal to 0 and less than or equal to 2. According to the invention, the positive electrode and the all-solid-state battery which have ultrahigh load capacity and ultra-long cycle life and can be charged and discharged under ultrahigh rate and ultra-high current density are obtained.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a sulfide solid electrolyte with lithium supplementation and moisture absorption, and its combination with TiS 2 Composite cathodes and all-solid-state battery devices made. Background technique [0002] Lithium-ion batteries, as high-efficiency energy storage devices, have achieved commercial applications in the fields of consumer electronics and electric vehicles. However, lithium-ion batteries have reached a bottleneck in the improvement of energy density, and their safety issues are also worrying. The all-solid-state battery using solid-state electrolyte and metal lithium anode is a key technology to realize high-safety and high-energy-density batteries, which has attracted widespread attention from academia and industry. All-solid-state batteries use solid-state electrolytes with high thermal stability, density, and mechanical strength as ionic conductors to repl...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/58H01M10/0562
CPCH01M4/134H01M10/0562H01M4/5815Y02E60/10
Inventor 吴凡卢普顺李泓
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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