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Inorganic electrolyte, preparation method thereof and lithium battery thereof

An electrolyte and inorganic technology, applied in electrolytes, secondary batteries, circuits, etc., can solve the problems that all-solid-state batteries do not have the conditions for industrialization, reduce the performance of organic electrolytes, and poor performance of all-solid-state batteries. Potential phenomenon, improving the electrochemical stability window, improving the effect of stability

Active Publication Date: 2018-05-25
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to further improve the safety of lithium batteries, a large amount of research work is currently focused on the development of non-flammable electrolytes. The two most common technical routes are the all-solid-state electrolyte route and the organic electrolyte flame-retardant additive route. Both routes have certain defects: 1) The all-solid electrolyte has low room temperature ionic conductivity, complex preparation process, and is not compatible with the current lithium-ion production line
All-solid-state batteries using all-solid-state electrolytes usually have poor performance and high cost, so all-solid-state batteries are not yet ready for industrialization
2) The technical route of preparing a non-flammable electrolyte by adding a flame retardant additive to the organic electrolyte is feasible, but the addition of the flame retardant additive reduces the performance of the organic electrolyte, and the electrolyte still has the risk of fire and combustion
[0004] Therefore, although the inorganic electrolyte has the advantages of non-flammability, high ionic conductivity, and good low-temperature performance, its application in lithium-ion batteries is limited due to its high saturated vapor pressure and narrow voltage window.

Method used

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  • Inorganic electrolyte, preparation method thereof and lithium battery thereof
  • Inorganic electrolyte, preparation method thereof and lithium battery thereof
  • Inorganic electrolyte, preparation method thereof and lithium battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the first step: LiCl and AlCl 3 Mix evenly according to the stoichiometric ratio of 1.1:1, and dry in vacuum at 110°C for 3h.

[0036] The second step: the above LiCl and AlCl 3 The mixture is placed in a closed container and continuously fed with sulfur dioxide gas until liquid LiAlCl is obtained. 4 ·3SO 2 solution.

[0037] Step 3: Add the LiI inorganic salt additive to the above solution at a content of 2 wt%, and continue stirring and dissolving under the sulfur dioxide atmosphere.

[0038] The fourth step: to the above-mentioned LiAlCl containing LiI inorganic salt additive 4 ·3SO 2 Lithium metal flakes were added into the solution and allowed to stand for 24 hours to obtain an inorganic electrolyte.

[0039] Step 5: The positive electrode is made of Ketjen carbon, and the negative electrode is made of metal lithium sheet. The CR2032 button battery is assembled in an environment with controlled water and oxygen content, and the corresponding ele...

Embodiment 2

[0041] Embodiment 2: the first step: with NaCl and AlCl 3 Mix evenly according to the stoichiometric ratio of 1.1:1, and dry in vacuum at 120°C for 10h.

[0042] The second step: the above NaCl and AlCl 3 The mixture is placed in a closed container and continuously fed with sulfur dioxide gas until liquid LiAlCl is obtained. 4 ·2SO 2 solution.

[0043] The third step: the GaCl 3 and LiI inorganic salt additives were added to the above solution in the amount of 5wt% and 1wt%, respectively, and were continuously stirred and dissolved under the sulfur dioxide atmosphere.

[0044] Step 4: To the above-mentioned containing GaCl 3 LiAlCl and LiI inorganic salt additive 4 ·2SO 2 Sodium metal was added to the solution and left to stand for 24 hours to obtain an inorganic electrolyte.

[0045] Step 5: Lithium cobaltate is used for the positive electrode, and lithium titanate is used for the negative electrode. A CR2032 button battery is assembled in an environment with controll...

Embodiment 3

[0046] Embodiment 3: the first step: MgCl 2 and AlCl 3 Mix evenly according to the stoichiometric ratio of 1.1:2, and dry in vacuum at 150°C for 5 hours.

[0047] The second step: the above MgCl 2 and AlCl 3 The mixture is placed in a closed container and continuously fed with sulfur dioxide gas until liquid Mg (AlCl 4 ) 2 4.5SO 2 solution.

[0048] Step 3: Add the LiI inorganic salt additive into the above-mentioned liquid inorganic electrolyte at a content of 10 wt%, and continue stirring and dissolving under the sulfur dioxide atmosphere.

[0049] The fourth step: to the above-mentioned MgAlCl containing LiI inorganic salt additive 5 4.5SO 2 Lithium metal was added into the solution, and left to stand for 24 hours to obtain an inorganic electrolyte.

[0050] Step 5: Use lithium iron phosphate as the positive electrode and lithium metal sheet as the negative electrode. Assemble the CR2032 button battery in an environment with controlled water and oxygen content, and...

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Abstract

The invention relates to an inorganic electrolyte, a preparation method thereof and a lithium battery thereof. The inorganic electrolyte comprises M(AlCl <4 >)y.xSO<2> and inorganic salt additive. Theinorganic salt additive is selected from at least one of alkali metal iodide, alkaline earth metal iodide, LiNO<3>, GaCl<3> and LiBr. The y is greater than or equal to 1 and is smaller than or equalto 2. The x is greater than 0 and is smaller than or equal to 12. The M is selected from a first main group metal element and / or a second main group metal element. According to the inorganic electrolyte provided by the invention, the stability and electrochemical stability window of the electrolyte are improved, and the overpotential in a discharge process of the lithium battery is reduced.

Description

technical field [0001] The invention relates to an inorganic electrolytic solution, a preparation method thereof and a lithium battery thereof. Background technique [0002] With the widespread use of lithium batteries, the safety of lithium batteries is a common concern. The organic electrolyte used in traditional lithium batteries usually has the risk of being flammable and explosive. In order to further improve the safety of lithium batteries, a large amount of research work is currently focused on the development of non-flammable electrolytes. The two most common technical routes are the all-solid-state electrolyte route and the organic electrolyte flame-retardant additive route. Both routes have certain defects: 1) The all-solid-state electrolyte has low room temperature ionic conductivity, complex preparation process, and is incompatible with the current lithium-ion production line. All-solid-state batteries using all-solid-state electrolytes usually have poor perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0563H01M10/0525
CPCH01M10/0525H01M10/0563H01M2300/002Y02E60/10
Inventor 文娟·刘·麦蒂斯张佳卫钱培权
Owner 微宏先进材料公司
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