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Sodium-ion battery positive electrode material additive and sodium-ion battery positive electrode material

A technology of sodium ion battery and positive electrode material, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problem of reducing the specific capacity and cycle stability of sodium ion batteries, unable to take into account the cycle performance and battery capacity, and the use of sodium ion batteries. Shorter life and other problems, to achieve the effect of facilitating rapid transfer, reducing lattice collapse, improving specific capacity and cycle stability

Pending Publication Date: 2022-02-01
SHANDONG YUHUANG NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium ions are distributed in MO 2 Between layers or in gaps in the structure, the existing P 2 Type ratio O 3 type has a lower diffusion barrier, so P 2 The electrochemical performance of the phase is better than that of O 3 type, however P 2 Type positive electrode materials often cannot take into account cycle performance and battery capacity, and in the process of charging and discharging, with the intercalation and deintercalation of sodium ions, the internal lattice structure of the positive electrode material collapses, reducing the number of intercalation sites of sodium ions and reducing the amount of sodium ions. The specific capacity and cycle stability of ion batteries lead to a shorter service life of sodium-ion batteries

Method used

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  • Sodium-ion battery positive electrode material additive and sodium-ion battery positive electrode material
  • Sodium-ion battery positive electrode material additive and sodium-ion battery positive electrode material
  • Sodium-ion battery positive electrode material additive and sodium-ion battery positive electrode material

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Embodiment 1

[0059] The present embodiment prepares additive according to the following steps:

[0060] 1) mixing and reacting sodium salt, nickel salt, M salt and solvent to form a mixed slurry;

[0061] 2) Dispersing NaA in a solvent to obtain a NaA solution;

[0062] 3) Add the NaA solution into the mixed slurry, disperse for 30min-2h, filter it with suction and dry it in an oven at 120°C;

[0063] 4) Put the dried powder in a rotary kiln for calcining to obtain the additive.

[0064] Preferably, the calcination is carried out under a protective gas, and the calcination includes:

[0065] One-stage calcination: the calcination temperature is 100-300°C, and the calcination time is 2-5h;

[0066] Two-stage calcination: the calcination temperature is 800-1000°C, and the calcination time is not less than 6 hours.

[0067] Prepare additives 1#-10# and comparative additives D1#-D3# according to the above steps, as follows:

[0068] Additive 1#

[0069] (1) 77.9g CH 3 COONa, 82.1g (CH ...

Embodiment 2

[0111] Preparation of positive electrode matrix material:

[0112] 55.0gCH 3 COONa, 82.1g (CH 3 COO) 2 Ni·4H 2 O and 164.2g (CH 3 COO) 2 Mn 4H 2 O (the mol ratio of Na salt, Ni salt, Mn salt is 0.67:0.33:0.67) joins in 1L ethanol respectively, obtains sodium acetate solution, nickel acetate solution and manganese acetate solution; Then sodium acetate solution, nickel acetate solution and The manganese acetate solution is mixed and placed in the autoclave, and the autoclave is sealed;

[0113] Control the pressure of the autoclave to 15MPa, and react the autoclave in an oil bath at 160°C for 10 hours;

[0114] The product was washed with water and ethanol three times respectively, and dried in a spray dryer at a temperature of 80°C for 10 minutes. After the product was washed with water and alcohol, the residual alkali of the product was effectively reduced, and the stability of the material in the air was improved. sex;

[0115] Put the sagger containing the cleaned p...

Embodiment 3

[0121] The positive electrode base material Na prepared in embodiment 2 0.67 Ni 0.33 mn 0.67 o 2 , the additive 1# that embodiment 1 prepares, polyvinylidene chloride and superfine carbon powder prepare the positive pole of sodium-ion battery according to the weight ratio of following table 3 respectively, take hard carbon as negative pole, take sodium hexafluorophosphate as electrolytic solution, respectively Assemble soft-pack batteries 11#-15#, and conduct performance tests on them. The results are shown in Table 3 below.

[0122] table 3

[0123]

[0124] According to the batteries 11#-15# prepared in this embodiment, it can be seen that Na 0.67 Ni 0.33 mn 0.67 o 2 , The ratio of additives, polyvinylidene chloride and ultrafine carbon powder can affect the charge-discharge specific capacity of the battery and the cycle performance of the battery. With the combination of additives and positive electrode matrix materials, a positive electrode material with double-e...

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Abstract

The invention discloses a sodium-ion battery positive electrode material additive and a sodium-ion battery positive electrode material, and belongs to the technical field of sodium-ion batteries. The chemical composition of the sodium ion battery positive electrode material additive is NaA@NaxNiyM1-yO2, wherein x is more than or equal to 0.8 and less than or equal to 1.2, y is more than or equal to 0.1 and less than or equal to 0.5, M is selected from at least one of Zn, Ag, Zr, Mo, Mg and Nb, and A is selected from at least one of F<->, CN<->, Cl<->, Br<->, HSO4<-> and H2PO4<->; and the phase of the additive is O3 type. When the additive is added into a P2 type positive electrode base material to prepare the positive electrode material, the lattice structure can be stabilized in the sodium ion embedding and de-embedding process, the lattice collapse can be reduced, the specific capacity and the cycling stability of the sodium ion battery can be improved, and the service life of the sodium ion battery can be prolonged.

Description

technical field [0001] The application relates to a sodium ion battery cathode material additive and a sodium ion battery cathode material, belonging to the technical field of sodium ion batteries. Background technique [0002] In the 1990s, among many secondary batteries, lithium-ion batteries took the lead in seizing the opportunity to develop strongly. According to the statistics of Zhongguancun Energy Storage Industry Technology Alliance in 2019, lithium-ion batteries accounted for as high as 80% of the global electrochemical scale energy storage demonstration projects. However, although the performance of lithium-ion batteries is good, the reserves of lithium resources are limited, and 70% are distributed in South America. At present, 80% of lithium resources in my country depend on imports, so many researchers have begun to look for new alternative energy sources. [0003] Sodium is the fourth element with the most abundant reserves in the world. It is cheap, and sodi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/48H01M4/485H01M4/52H01M4/525H01M4/58H01M10/054
CPCH01M4/62H01M4/582H01M4/5825H01M4/58H01M4/483H01M4/485H01M4/523H01M4/525H01M10/054H01M2004/028Y02E60/10
Inventor 时爽二张立君戚昌伟马彦芳王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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