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High-performance all-solid-state lithium ion battery with stable structure and preparation method thereof

A lithium-ion battery with a stable structure, applied in the direction of lithium batteries, structural parts, battery electrodes, etc., can solve the problems of accelerating the decomposition of solid electrolytes, unfavorable utilization of active materials, etc., and achieve the goal of improving electronic and ion conductance and excellent electrochemical performance Effect

Pending Publication Date: 2022-08-05
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because low conductivity is not conducive to the utilization of active materials, high operating voltage will accelerate the decomposition of solid electrolytes

Method used

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  • High-performance all-solid-state lithium ion battery with stable structure and preparation method thereof
  • High-performance all-solid-state lithium ion battery with stable structure and preparation method thereof
  • High-performance all-solid-state lithium ion battery with stable structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: A lithium -rich manganese -based all -solid lithium -ion battery, including positive poles, solid electrolytes and negative electrodes. The preparation process is as follows:

[0062] First prepare the positive pole:

[0063] (1) Preparation of layer -shaped lithium -rich manganese positive materials: 0.5Lini for lithium -rich manganese active materials 0.33 CO 0.43 Mn 0.23 O 2 -0.5Li 2 MNO 3 With stable cover layer raw materials dissolved in ethanol linbo 3 After mixing together, dry, the stable cover layer that was originally dissolved in the solvent was covered with the surface of the layer -shaped lithium -rich manganese positive material with the volatilization of the solvent; Rich lithium manganese positive material and sulfide solid -state electrolyte li 6 PS 5 After the CL solution is mixed, it is dry again to form a double -covered layer -shaped lithium -rich manganese positive material.

[0064] The stable covering layers on the surface of the layer -sh...

Embodiment 2

[0072]The preparation process of the positive film is basically the same as the embodiment 1. The difference is that the content of CO in the layer -shaped lithium -rich manganese is different. 3 And li 6 PS 5 CL sulfide electrolytic double cover 0.5Lini 0.33 CO 0.33 Mn 0.33 O 2 -0.5Li 2 MNO 3 Lithium -rich manganese oxides are positive materials. The assembly and testing conditions of a full solid -state battery are the same as Example 1.

[0073] image 3 In order to use ion blocking batteries to measure the electronic conductivity of lithium -rich manganese, and Figure 4 In order to use electronic blocking batteries to measure the ionic conductivity of lithium -rich manganese. It can be seen that the typical lithium -rich manganese material 0.5Lini 0.33 CO 0.33 Mn 0.33 O 2 -0.5Li 2 MNO 3 The electronic conductivity is 3.52 × 10 -9 S · cm -1 , Ion conduction rate is 2.65 × 10 -10 S · cm -1 , They are very low. In contrast, 0.5Lini 0.33 CO 0.43 Mn 0.23 O 2 -0.5Li 2 MNO 3 The elec...

Embodiment 3

[0075] The preparation process of the positive film is basically the same as the embodiment 1. The difference is that the content of CO in the layer -shaped lithium -rich manganese is different. 3 And li 6 PS 5 CL sulfide electrolytic double cover 0.5Lini 0.33 CO 0.38 Mn 028 O 2 -0.5Li 2 MNO 3 Lithium -rich manganese oxides are positive materials. The assembly and testing conditions of a full solid -state battery are the same as Example 1.

[0076] Figure 5 In order to use ion blocking batteries to measure the electronic conductivity of lithium -rich manganese, and Image 6 In order to use electronic blocking batteries to measure the ionic conductivity of lithium -rich manganese. It can be seen that 0.5Lini 0.33 CO 0.38 Mn 028 O 2 -0.5Li 2 MNO 3 The electronic conductivity is 6.7 × 10 -8 S · cm -1 , Ion conduction rate is 2.63 × 10 -9 S · cm -1 Essence

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Abstract

The invention discloses a high-performance all-solid-state lithium ion battery with a stable structure and a preparation method of the high-performance all-solid-state lithium ion battery, the lithium-rich manganese-based all-solid-state lithium ion battery comprises a double-coated layered lithium-rich manganese positive electrode, a solid electrolyte layer and a negative electrode, a lithium-rich manganese active material is (1-z) LiNi < 0.33 > Co < 0.33 + x > Mn < 0.33-x > O < 2-z > Li < 2 > MnO < 3-y > LiNi < O2 >, x is equal to 0-0.33, y is equal to 0-0.8, and z is greater than 0 and less than 1. By regulating and controlling the content of Co and LiNiO2 components in the lithium-rich manganese, the conductivity and the structure of the lithium-rich manganese are optimized, the prepared lithium-rich manganese-based all-solid-state lithium ion battery has extremely excellent cycling stability, the conductivity can be improved by two orders of magnitude by increasing the content of Co by 0.10, a LiNiO2 spinel structure is formed on the surface of the lithium-rich manganese, and the lithium-rich manganese-based all-solid-state lithium ion battery can be applied to lithium ion batteries. According to the present invention, the lithium-rich manganese material surface ion diffusion can be further improved, the discharge capacity of the 0.5 LiNi < 0.33 > Co < 0.43 > Mn < 0.220 > O < 2 >-0.5 Li2MnO < 3 >-0.1 LiNiO < 2 > positive electrode can achieve 215 mAh g <-1 >, and the capacity retention rate after 1000 cycles in the all-solid-state battery can achieve 83%, such that the cycle performance is far superior to the cycle performance of the liquid-state battery. The preparation method disclosed by the invention is simple and efficient to implement, and is expected to realize all-solid-state commercial application of the high-capacity lithium-rich manganese material.

Description

Technical field [0001] The invention involves the field of secondary battery technology and is more specific, involving a stable high -performance full -solid lithium -ion battery and its preparation methods. Background technique [0002] The full -solid lithium -ion battery using non -flammable inorganic solid electrolyte has excellent safety due to excellent safety, and has been widely studied in recent years. However, the current international research is mainly concentrated in cobaltate (LCO) and high nickel positive (NCM). This is because LCO and NCM itself have good electron and ionic conductivity (10 -5 ~ 10 -3 S · cm -1 ), Used in a full -solid battery, can also achieve good performance without carbon conductives. However, due to the limitation of the materials of the LCO and NCM positive poles, the actual capacity of the positive side side is 200mAh · G -1 Below, energy density is generally limited at 760Wh · kg -1 Inside, it is far from meeting people's demand for high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M4/36H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0562
CPCH01M10/0585H01M10/0562H01M10/052H01M4/366H01M4/364H01M4/505H01M4/525H01M4/62H01M4/624Y02P70/50
Inventor 潘洪革武志俊
Owner XIAN TECHNOLOGICAL UNIV