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A secondary battery electrode material containing intrinsic vacancies and battery

A technology for secondary batteries and electrode materials, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of limited selection range, low material capacity, and high cost, achieve high energy density, improve specific capacity, and improve electrodes. The effect of material requirements

Active Publication Date: 2022-02-22
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the requirement that the charge compensation is mainly or completely provided by the redox reaction of transition metal ions, the selection range of the structure and composition of traditional electrode materials is greatly limited, and the material capacity is low and the cost is high.

Method used

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  • A secondary battery electrode material containing intrinsic vacancies and battery
  • A secondary battery electrode material containing intrinsic vacancies and battery
  • A secondary battery electrode material containing intrinsic vacancies and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example is used to illustrate that Na containing intrinsic vacancies 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 The preparation process, structural characteristics and performance for sodium metal secondary batteries.

[0040] Its preparation method can mainly be carried out according to the following steps.

[0041] First NaOH and MnO 2 Mix and grind evenly at a molar ratio of 2:3, then place the above mixture in a muffle furnace, sinter at 400°C for 24 hours in an air atmosphere, cool down to room temperature and take it out for later use to obtain Na 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 .

[0042] figure 1 with figure 2 respectively for the prepared Na 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 XRD patterns and SEM pictures of the materials. It can be seen from the figure that there are vacancies occupied by manganese sites in the material structure.

[0043] Na prepared in this example 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 The material is the positive electrode, the metal sodium is the negative electrode, an...

Embodiment 2

[0050] This example is used to illustrate that Na containing intrinsic vacancies 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 Preparation process and properties for sodium metal secondary batteries.

[0051] In this example Na 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 The preparation method is with embodiment 1.

[0052]When assembling a sodium-ion secondary battery, pyrolytic carbon is used as the negative electrode, and Na 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 As the positive electrode, 1mol L dissolved in EC and DMC (volume ratio 1:1) -1 NaPF 6 The solution is an electrolyte, and a sodium ion secondary battery is assembled in dry air.

[0053] Electrochemical tests were performed on the sodium-ion secondary battery: the test voltage of the sodium-ion secondary battery was 1.4-4.0V, and other test conditions were the same as in Example 1. Electrochemical performance test results show that the charging capacity in the first week is 200mAh·g -1 , The capacity retention rate was 95% after 20 weeks of circulation.

Embodiment 3

[0055] This example is used to illustrate that Na containing intrinsic vacancies 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 It is used in the preparation process and performance of metallic lithium secondary batteries.

[0056] In this example Na 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 The preparation method is with embodiment 1.

[0057] When assembling metal lithium secondary batteries, metal lithium is used as the negative electrode, and Na 4 / 7 (Mn 6 / 7 Δ 1 / 7 )O 2 As the positive electrode, 1mol L dissolved in EC and DMC (volume ratio 1:1) -1 LiPF 6 The solution is an electrolyte, and a lithium metal secondary battery is assembled in a glove box filled with argon.

[0058] Electrochemical testing was performed on the metal lithium secondary battery: the test voltage range of the metal lithium secondary battery was 2.0-4.4V, and other test conditions were the same as in Example 1. Electrochemical performance test results show that the charging capacity in the first week is 180mAh·g -1 , The capaci...

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Abstract

The invention discloses a secondary battery electrode material containing intrinsic vacancies and a battery. The general chemical structure formula of the secondary battery electrode material containing intrinsic vacancies is A x (M y Δ w )B z ; wherein, A is an alkali metal or alkaline earth metal cation; M is a metal or non-metal cation, and the atomic number of M is greater than that of A; ; B is an anion or an anion group; in the general chemical structure formula, 0<x≤10, 0<y<10, 0<w<10, 0<z≤10; in the spatial structure of the secondary battery electrode material In the polyhedral layer composed of M cations and B anions or anion groups, there are intrinsic M vacancies Δ formed by some M cation sites not being occupied by any ions.

Description

technical field [0001] The invention relates to the technical field of new energy storage devices, in particular to a secondary battery electrode material containing intrinsic vacancies and a battery. Background technique [0002] The development of electrode materials with high specific capacity is the key to improving the energy density of secondary batteries. At present, the secondary battery cathode material in the market application and scientific research is mainly LiCoO based on the redox reaction of transition metal ions. 2 ,LiFePO 4 and LiMn 2 o 4 , and nickel-cobalt-manganese ternary transition metal oxides, lithium-rich transition metal oxides, lithium iron manganese phosphate, lithium nickel manganese oxide, etc. derived on this basis. The negative electrode materials are mainly based on various types of graphitic carbon and Li 4 Ti 5 o 12 etc., silicon (and silicon-carbon composites) based on alloying reactions, etc. [0003] However, the specific capaci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M10/05
CPCH01M4/36H01M4/48H01M4/58H01M10/05Y02E60/10
Inventor 李叶晶王兆翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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