Preparation method for composite modified LiNi0.5Mn1.5O4 cathode material with improved cycle performance

A cathode material, composite modification technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of difficulty in eliminating cathode materials, electrolyte erosion and dissolution, shortening cycle life, etc., and achieve excellent cycle performance. , Strong electron-absorbing ability, reducing the effect of erosion

Inactive Publication Date: 2014-03-26
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Lithium nickel manganese oxide (LiNi) prepared by various preparation processes 0.5 mn 1.5 o 4 ) It is difficult for positive electrode materials to completely eliminate Mn 3+ The existence of , and its high working voltage makes it susceptible to erosion and dissolution of the electrolyte and reduces its cycle life
Although the commonly used metal cation doping can improve the corrosion problem of the electrolyte, it cannot fundamentally solve the corrosion problem of the electrolyte, and the metal oxide coating will react with the trace amount of HF contained in it.

Method used

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  • Preparation method for composite modified LiNi0.5Mn1.5O4 cathode material with improved cycle performance
  • Preparation method for composite modified LiNi0.5Mn1.5O4 cathode material with improved cycle performance

Examples

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Embodiment 1

[0023] Weigh 4.31g of nickel sulfate hexahydrate and 8.33g of manganese sulfate monohydrate and dissolve them in 35ml of distilled water, transfer them to a four-necked flask under nitrogen protection, add 15ml of 25% ammonia water dropwise therein, and carry out complexation reaction after the addition is completed 30min, then dropwise add 4mol / L sodium hydroxide 46ml, after the dropwise addition is completed, aging for 5h, after filtering, washing and drying, Ni 0.5 mn 1.5 (OH) 4 Precursor, weighing 5.7g precursor, 1.23g lithium carbonate and 0.06g NH 4F, after mixing, put it in the muffle furnace for sintering at 800°C for 10h in the front section, and sinter at 580°C for 12h in the back section, and then get LiNi after cooling 0.5 mn 1.5 o 3.95 f 0.05 Cathode material, ready for use.

[0024] Weigh 6g LiNi 0.5 mn 1.5 o 3.95 f 0.05 The cathode material is added with dissolved NH 4 In the aqueous solution of F, add a solution containing 0.3g of aluminum nitrate no...

Embodiment 2

[0027] Weigh 3.90g of nickel chloride hexahydrate and 9.75g of manganese sulfate tetrahydrate and dissolve them in 35ml of distilled water, transfer them to a four-neck flask under nitrogen protection, add 23ml of 18% ammonia water dropwise therein, and perform complexation after the addition is completed React for 1h, then dropwise add 4mol / L sodium hydroxide 46ml, after the dropwise addition, age for 6h, filter, wash and dry to obtain Ni 0.5 mn 1.5 (OH) 4 Precursor, weighing 5.7g precursor, 1.23g lithium carbonate and 0.06g NH 4 F, after mixing, put it in the muffle furnace for sintering at 800°C for 10h in the front section, and sinter at 600°C for 10h in the back section, and then get LiNi after cooling 0.5 mn 1.5 o 3.95 f 0.05 Cathode material, ready for use.

[0028] Weigh 6g LiNi 0.5 mn 1.5 o 3.95 f 0.05 The cathode material is added with dissolved NH 4 In the aqueous solution of F, add a solution containing 0.3g of aluminum nitrate nonahydrate, stir for 1 ho...

Embodiment 3

[0031] Weigh 3.90g of nickel chloride hexahydrate and 8.33g of manganese sulfate monohydrate and dissolve them in 35ml of distilled water, transfer them to a four-neck flask under nitrogen protection, add 23ml of 18% ammonia water dropwise therein, and perform complexation after the addition is completed React for 1h, then dropwise add 36ml of 5mol / L sodium hydroxide, after the dropwise addition, age for 6h, filter, wash and dry to obtain Ni 0.5 mn 1.5 (OH) 4 Precursor, weighing 5.7g precursor, 0.75g lithium carbonate and 0.06g NH 4 F, after mixing, put it in the muffle furnace for sintering at 700°C for 15h in the front section, and sinter at 550°C for 10h in the back section, and then get LiNi after cooling 0.5 mn 1.5 o 3.95 f 0.05 Cathode material, ready for use.

[0032] Weigh 6g LiNi 0.5 mn 1.5 o 3.95 f 0.05 The cathode material is added with dissolved NH 4 In the aqueous solution of F, add a solution containing 0.2 g of aluminum nitrate hexahydrate, stir for 1...

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Abstract

The invention provides a preparation method for composite modified LiNi0.5Mn1.5O4 cathode material with improved cycle performance. The method mainly comprises the followings steps: (1) a nickel source and a manganese source compound are dissolved in distilled water, and under the protection of inert atmosphere, precursor particles are prepared by adding ammonia water for complexing and adding a precipitating agent for precipitation; (2) precursors are washed and dried, a lithium source and fluorochemical are added, the mixing is performed, and then two-section sintering process is performed, so that F-doped LiNi0.5Mn1.5O(4-x)Fx is obtained; (3) the LiNi0.5Mn1.5O(4-x)Fx is added in to a water solution, in which NH4F is dissolved; (4) the dried material is placed into a muffle furnace for calcination, so that LiNi0.5Mn1.5O(4-x)Fx cathode material coated with metal fluoride (ALF3, MgF2) is obtained.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery LiNi modified by doping and coating 0.5 mn 1.5 o 4 The method for the positive electrode material, in particular relates to a method for compound modification to improve the cycle of lithium nickel manganese oxide positive electrode material. Background technique [0002] The development direction of lithium-ion batteries is mainly high energy density and high power density, and the energy density and power density are mainly related to the discharge capacity and working voltage of the material. However, the working voltage of the currently used lithium-ion battery cathode materials is lower than 4V, and the energy and power density of the battery are limited in application. If a higher voltage is required, multiple single cells need to be connected in series, and a large number of single cells is used, which brings a lot of inconvenience to battery performance, safety and cost, and is also no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/366H01M4/505H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博史新明
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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