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Lithium niobtate crystal and solid electrolyte and preparation methods and application thereof

A solid electrolyte, lithium niobate technology, applied in the field of lithium ion batteries, can solve the problems of low ionic conductivity of lithium niobate, deviation of chemical stability, application of lithium niobate materials, etc., to achieve good electrochemical stability, production The effect of high efficiency and simplified assembly process

Inactive Publication Date: 2015-01-14
HYB BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current crystalline solid electrolyte is still unsatisfactory, and there are problems such as high price, deviation in chemical stability, and harsh preparation conditions.
[0004] Lithium niobate materials with a rock salt structure have been widely used in the fields of optics, electricity, and special ceramic materials, but lithium niobate has low ion conductivity and has not been used in the field of solid electrolytes.
The Chinese invention patent with the patent number ZL201110052492.5 discloses "a nanostructured Li 3 NbO 4 The preparation method of ", the patent uses a two-step method to synthesize lithium niobate material: firstly, KNbO is synthesized by hydrothermal method 3 nanowires, then KNbO 3 Nanowires and Li 2 CO 3 After the powders are ground and mixed together, they are put into the muffle furnace for calcination, and after cooling, they are fully cleaned with deionized water. Although this process is simpler than the previous three-step method, it is still too complicated, and the intermediate product KNbO is introduced during the reaction process. 3 , it is easy to produce an intermediate phase, so that the purity of the final product lithium niobate is not high
The Chinese invention patent application with the application number 201010126637.7 discloses "a preparation method of a new type of microwave dielectric ceramic material". The invention is to introduce a certain amount of zinc oxide and magnesium oxide into the lithium niobate system. The preparation method is relatively simple, but the Materials are only limited to microwave dielectric ceramic materials, and lithium niobate materials have not been applied to solid electrolytes in lithium battery systems

Method used

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  • Lithium niobtate crystal and solid electrolyte and preparation methods and application thereof
  • Lithium niobtate crystal and solid electrolyte and preparation methods and application thereof
  • Lithium niobtate crystal and solid electrolyte and preparation methods and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) In order to get the chemical formula Li 2.975 Nb 0.975 W 0.025 o 4 The solid electrolyte material, the Li 2 CO 3 Powder, Nb 2 o 5 Powder and WO 3 The powder was weighed according to the stoichiometric ratio, and mixed with an agate mortar for 1 hour, in order to supplement Li during high temperature heating 2 CO 3 The loss of lithium ions in the medium, adding an excess of 3wt% Li before powder grinding 2 CO 3 Grind together;

[0039] (2) Put the uniformly mixed powder in step (1) into an alumina crucible with a lid, put the crucible into a muffle furnace at a heating rate of 2°C / min to 990°C and keep it at this temperature for 24 hours, Then the sample is cooled to room temperature at a cooling rate of 10°C / min;

[0040] (3) Grind the white powder obtained in step (2) again with an agate mortar for 1 hour, weigh a certain mass, put it into a mold, and apply a pressure of 3 tons to press it into a solid electrolyte sheet with high density. The electroly...

Embodiment 2

[0042] (1) In order to get the chemical formula Li 2.95 Nb 0.95 W 0.05 o 4 The solid electrolyte material, the Li 2 CO 3 powder, Nb 2 o 5 Powder and WO 3 The powder was weighed according to the stoichiometric ratio, and mixed with an agate mortar for 1.5 hours, in order to supplement Li during high temperature heating 2 CO 3 For the loss of lithium ions in the medium, add an excess of 3wt% Li before powder grinding 2 CO 3 Grind together;

[0043] (2) Put the uniformly mixed powder in step (1) into an alumina crucible with a lid, put the crucible into a muffle furnace at a heating rate of 3°C / min to 990°C and keep it at this temperature for 25 hours, Then the sample was lowered to room temperature at a cooling rate of 9°C / min;

[0044] (3) Grind the white powder obtained in step (2) again with an agate mortar for 1 hour, weigh a certain mass, put it into a mold, and apply a pressure of 2.5 tons to press it into a solid electrolyte sheet with high density. The elect...

Embodiment 3

[0046] (1) In order to get the chemical formula Li 2.925 Nb 0.925 W 0.075 o 4 The solid electrolyte material, the Li 2 CO 3 powder, Nb 2 o 5 Powder and WO 3 The powder was weighed according to the stoichiometric ratio, and it was ground and mixed with an agate mortar for 2 hours. In order to supplement the Li 2 CO 3 For the loss of lithium ions in the medium, add an excess of 3wt% Li before powder grinding 2 CO 3 Grind together;

[0047] (2) Put the uniformly mixed powder in step (1) into an alumina crucible with a lid, put the crucible into a muffle furnace at a heating rate of 4°C / min to 1000°C and keep it at this temperature for 24 hours, Then the sample is cooled to room temperature at a cooling rate of 8°C / min;

[0048] (3) Process according to step (3) of Example 1 to obtain a solid electrolyte.

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Abstract

The invention relates to lithium niobtate crystal and solid electrolyte and preparation methods and application thereof. The solid electrolyte is composed of lithium niobate crystal mixed with tungsten or molybdenum. The lithium niobate crystal mixed with tungsten or molybdenum is that tungsten W6+ or molybdenum Mo6+ is mixed into the lithium niobate crystal. The chemical formula is Li3-xNb1-xMxO4, wherein the x is equal to 0.01 to 0.4, and the M is tungsten or molybdenum. The preparation method comprises steps of using high temperature solid phase to prepare lithium niobtate crystal mixed with tungsten or molybdenum, dry pressing and sintering so as to be high in production efficiency, high in product output and high in purity. Any liquid organic solvent is not used, so that the safety problem of the lithium ion batteries is solved. The obtained solid electrolyte is high in ionic conductivity, good in electrochemical stability and wide in application prospect.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a solid electrolyte for lithium ion batteries and a preparation method thereof. Background technique [0002] The continuous progress of human society has promoted the development of energy storage and conversion. Secondary lithium-ion batteries have the advantages of high operating voltage, high energy density and power density, excellent cycle and rate performance, and are recognized as the best energy storage devices at present. In the 1990s, lithium-ion batteries have been commercialized on a large scale. However, these batteries generally use liquid flammable, explosive, and volatile organic solvents as electrolytes. Since the fire incident caused by the use of liquid electrolytes in Dell laptop batteries, people have begun to pay attention to and think about the safety issues caused by the use of liquid electrolytes. The development of new electrolyte materials has bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B1/10H01M10/0562H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 廖友好李伟善邱显焕冯岸柏冯洪亮
Owner HYB BATTERY