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Nickel lithium manganate positive electrode material for lithium ion battery and preparation method of nickel lithium manganate positive electrode material

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of impure products, can not solve the problems of crystalline oxygen defects in positive electrode materials, etc., and achieves small particle size, excellent rate performance and Effects of Cyclic Stability

Pending Publication Date: 2018-05-29
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with the solid-phase method is that the product is impure. The material prepared by the sol-gel method has a small particle size, uniform particles, and high purity. It is the most commonly used liquid-phase method.
The technical solutions in the above patents can increase the working voltage of lithium-ion batteries to a certain extent, and increase the energy and power density of lithium-ion batteries, but still cannot solve the problem of oxygen defects in the crystallization of positive electrode materials

Method used

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  • Nickel lithium manganate positive electrode material for lithium ion battery and preparation method of nickel lithium manganate positive electrode material
  • Nickel lithium manganate positive electrode material for lithium ion battery and preparation method of nickel lithium manganate positive electrode material
  • Nickel lithium manganate positive electrode material for lithium ion battery and preparation method of nickel lithium manganate positive electrode material

Examples

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Embodiment 1

[0032] Preparation of lithium nickel manganese oxide positive electrode material, the steps are as follows:

[0033] S01: dissolving nickel nitrate and manganese nitrate in deionized water and stirring to form a gel;

[0034] S02: Calcining the gel in S01 in a muffle furnace to fully react, the calcination temperature is 350°C, the sintering time is 4h, and cooled with the furnace;

[0035] S03: Mix the product in S02 with lithium carbonate, and calcinate at 750°C for 8 hours to fully react;

[0036] S04: Disperse the product in S03 in ethanol or aqueous solution dissolved in lithium carbonate, add zirconium nitrate, and coat;

[0037] S05: Filtrate and dry the product in S04 and then calcinate at 350°C to obtain the required positive electrode material, the average particle size of the positive electrode material is 5 μm;

[0038] The molar ratio of nickel nitrate in S01, manganese nitrate, lithium salt in S03, lithium salt in S04, and zirconium nitrate is 0.5:1.5:0.55:0.04...

Embodiment 2

[0040] The steps are the same as in Example 1, sucrose is added to form a gel together with the reactants in S01, and the amount of sucrose added is 1.8 times the molar amount of manganese nitrate in S01.

Embodiment 3

[0042] Preparation of lithium nickel manganese oxide positive electrode material, the steps are as follows:

[0043] S01: dissolving nickel nitrate and manganese nitrate in deionized water and stirring to form a gel;

[0044] S02: Calcining the gel in S01 in a muffle furnace to make it fully react, the calcination temperature is 400°C, the sintering time is 4h, and cooled with the furnace;

[0045] S03: Mix the product in S02 with lithium hydroxide, calcining at 700°C for 10 hours to fully react;

[0046] S04: Disperse the product in S03 in ethanol or aqueous solution dissolved in lithium hydroxide, add zirconium nitrate, and coat;

[0047] S05: Filtrate and dry the product in S04 and then calcinate at 400°C to obtain the required positive electrode material, the average particle size of the positive electrode material is 5 μm;

[0048] The molar ratio of nickel nitrate in S01, manganese nitrate, lithium salt in S03, lithium salt in S04, and zirconium nitrate is 0.7:1.5:1.05:0...

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Abstract

The invention discloses a preparation method of a high-voltage nickel lithium manganate positive electrode material xLi<2>ZrO<3>.LiNi<0.5>Mn<1.5>O<4> for a lithium ion battery. According to the method, nitrate is used as a raw material, nickel lithium manganate is synthesized by a gel combustion method, a layer of fast ion conductor is coated by a wet method, a large amount of gas is generated during the combustion process, so that the material fully and uniformly reacts, and a porous structure is formed. The material synthesized by the method is small and uniform in grain size, contact reaction between a particle surface and an electrolyte is separated after coating, and the material has favorable rate property and cycle stability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium nickel manganese oxide positive electrode material for lithium ion batteries, and to a preparation method for the lithium nickel manganese oxide positive electrode material. Background technique [0002] At present, among the cathode materials of lithium-ion batteries, LiMn 2 o 4 Cathode materials have attracted much attention due to their simple synthesis methods, low cost, and environmental friendliness. However, it suffers from poor cycle stability and low discharge plateau due to the Jahn-Teller effect. At present, the field of electric vehicles is booming, and higher requirements are put forward for the cathode materials that mainly provide energy, requiring materials with higher energy density. Therefore, high-voltage cathode materials have become a hot research direction. Lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) has a high-voltage platform ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 徐越王华丽宋华杰占涛涛淡维杰
Owner SHENZHEN BAK POWER BATTERY CO LTD