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Full-solid-state battery and preparation method thereof

An all-solid-state battery and solid-state electrolyte technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of high interface resistance, high ionic conductivity, and hindering the development of solid-state battery technology.

Active Publication Date: 2018-09-04
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since Bellcore successfully prepared polymer lithium-ion batteries with conductive polymer materials as solid electrolytes in 1994, polymer lithium-ion batteries have developed rapidly. Although polymer materials are simple to prepare, have strong plasticity, good safety performance, and lithium ion migration numbers High, but its low ionic conductivity and poor thermal stability seriously affect its application in lithium-ion batteries
The inorganic ionic conductors developed later have good thermal stability and high ionic conductivity. Introducing the inorganic ionic conductors into the polymer electrolyte can improve the mechanical properties and ionic conductivity of the electrolyte. There is a serious interface incompatibility between them, and the interface resistance is large, which hinders the development of solid-state battery technology

Method used

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  • Full-solid-state battery and preparation method thereof

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preparation example Construction

[0078] The preparation method of the positive electrode material with the above-mentioned three-layer core-shell structure is to dissolve a certain quality of soluble lithium source, soluble titanium source, soluble aluminum source, and soluble phosphate in water or a mixed solvent of water and an organic solvent, and add a certain amount of glue Coagulant, adjust the pH to close to neutral to form a sol; add Al(OH) under constant stirring 3 Coated ternary cathode material precursor or Al 2 o 3 The coated ternary cathode material is heated to the sol solution, and coagulation occurs to obtain a gel, so that Al(OH) 3 The coated ternary cathode material precursor is coated with Li, Ti, Al and phosphate, and some lithium ions in the solution will penetrate into the inner layer and be embedded on the ternary cathode material precursor. The gel is calcined in an oxygen-containing atmosphere to obtain a three-layer core-shell structure cathode material, that is, the core changes f...

Embodiment 1

[0087] 1. Preparation of positive electrode active material:

[0088] (1) Lithium nickel cobalt manganese oxide LiNi 0.6 co 0.2 mn 0.2 o 2 Preparation of the precursor of the ternary cathode material:

[0089] 109.620g nickel nitrate Ni(NO 3 ) 2 , 58.211g cobalt nitrate Co(NO 3 ) 2 ·6H 2O, 35.790g manganese nitrate Mn(NO 3 ) 2 Add it to 700ml of isopropanol, and then add 1mol / L ammonium bicarbonate solution dropwise thereto until the pH of the solution is 10-12. Then put it in a polytetrafluoroethylene reactor for solvothermal reaction at 150° C. for 12 hours, and then filter and wash to obtain a ternary cathode material precursor.

[0090] (2) Preparation of aluminum hydroxide-coated ternary cathode material precursor:

[0091] Add the above-mentioned ternary cathode material precursor to 42.0ml of 0.01mol / L aluminum sulfate solution and stir to form a uniform dispersion, then slowly add sodium bicarbonate solution dropwise to it while stirring until no more gas i...

Embodiment 2

[0110] Embodiment 2 is the same as step 2-step 4 of embodiment 1, the difference is only that the preparation process of the positive electrode active material in step 1 is as follows:

[0111] (1) Lithium nickel cobalt manganese oxide LiNi 0.8 co 0.1 mn 0.1 o 2 Preparation of the precursor of the ternary cathode material:

[0112] 146.16 (0.8mol) nickel nitrate Ni (NO 3 ) 2 , 29.10g (0.1mol) cobalt nitrate Co(NO 3 ) 2 ·6H 2 O, 17.90g (0.1mol) manganese nitrate Mn (NO 3 ) 2Add it to 700ml of ethanol, and then dropwise add 1mol / L ammonium bicarbonate solution therein until the pH of the solution is 10-12. Then place it in a polytetrafluoroethylene reactor for solvothermal reaction at 150° C. for 12 hours, and then filter and wash to obtain a positive electrode material precursor.

[0113] (2) Preparation of alumina-coated ternary cathode material precursor:

[0114] Add the above-mentioned spherical precursor to 42.0ml of 0.01mol / L aluminum nitrate solution and stir...

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Abstract

The invention relates to a full-solid-state battery, which comprises a positive electrode and solid-state electrolyte, wherein a positive electrode active material on the surface of the positive electrode is in contact with the solid-state electrolyte; the positive electrode active material and the solid-state electrolyte contain same substances. Preferably, the identical substance ingredients arefast ion conductors Li1+xAlxTi2+x(PO4)3 (the x is greater than 0 but smaller than or equal to 0.5). Therefore the composition ingredients of the solid-state electrolyte and the composition ingredients of the positive electrode active materials contain the identical substances, so that the homogenesis compatibility between the battery positive electrode and the solid-state electrolyte is improved;the interface resistance is reduced. The invention also relates to a preparation method of the full-solid-state battery.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, and in particular relates to an all-solid-state battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, no memory effect, and no pollution to the environment. They have been widely used in portable electronic devices and power vehicles. Therefore, lithium-ion batteries and their related materials have become a hot research topic at present. [0003] Traditional lithium-ion batteries generally use organic electrolytes and separators, which are prone to serious safety hazards such as flammability, explosion, and night leakage during use. In order to solve safety problems, the development of all-solid-state batteries has become a future development trend. Compared with traditional liquid lithium-ion batteries, solid-state batteries have obvious advantages: (1) solid-state...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/0525H01M4/36H01M4/485H01M4/62
CPCH01M4/366H01M4/485H01M4/624H01M10/0525H01M10/056H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 靳岩娄忠良胡泽林
Owner SOUNDON NEW ENERGY TECH CO LTD
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