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Positive electrode material and preparation method thereof, lithium ion battery

A powder material and coating technology, which is applied in the fields of lithium ion batteries, positive electrode materials and preparation methods, can solve the problems of difficult uniform coating on the surface, agglomeration of high nickel materials, and poor control of material particle size, etc., and is convenient for scale. Effects of production, low cost, excellent cycle stability

Inactive Publication Date: 2019-01-11
SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to overcome the problem that the solid-phase sintering method used in the preparation process of the positive electrode material in the prior art is not easy to control the particle size of the material, it is difficult to coat the surface evenly, and the sintering temperature is too high, which easily causes high-nickel materials to agglomerate defects, provide a positive electrode material and preparation method, lithium ion battery

Method used

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  • Positive electrode material and preparation method thereof, lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Weigh 10g of 811NCM powder material, put it into a mixed solution of 1000mL ethanol and deionized water (1:1 volume ratio) and stir for 30min to form solution A; the concentration of 811NCM solution is 2mg / mL ;

[0033] 2. Weigh 0.32g of Bi(NO 3 ) 3 ·5H2 O, dissolved in 500mL deionized water to form solution B; where 811NCM and Bi(NO 3 ) 3 ·5H 2 The molar ratio of O is 200:1, Bi(NO 3 ) 3 ·5H 2 The concentration of O aqueous solution is 0.64mg / mL;

[0034] 3. Add solution A dropwise to solution B, stir and mix for 1 hour to form solution C;

[0035] 4. Measure 500mL (NH 4 )H 2 PO 4 Aqueous solution (concentration is 0.2mg / mL), in stirring process, drips into solution C drop by drop, obtains mixed solution D; Wherein (NH 4 )H 2 PO 4 with Bi(NO 3 ) 3 ·5H 2 The mol ratio of O is 1:1; Wherein, rate of addition is 5mL / min;

[0036] 5. Heat the mixed solution D in a water bath while stirring, the temperature is 80°C, the stirring time is 2 hours, and the s...

Embodiment 2

[0039] 1. Put the 811NCM powder material into the mixed solution of ethanol and deionized water (1:1 volume ratio) for ultrasonic dispersion for 1 hour to form solution A; the concentration of 811NCM solution is 10mg / mL;

[0040] 2. Weigh Bi(NO 3 ) 3 ·5H 2 O, dissolved in deionized water to form solution B; where 811NCM and Bi(NO 3 ) 3 ·5H 2 The molar ratio of O is 300:1, Bi(NO 3 ) 3 ·5H 2 The concentration of O aqueous solution is 0.2 mg / mL;

[0041] 3. Add solution A dropwise to solution B, stir and mix for 20 minutes to form solution C;

[0042] 4. (NH 4 )H 2 PO 4 Aqueous solution (concentration is 0.047mg / mL), in stirring process, drips into solution C drop by drop, obtains mixed solution D; Wherein (NH 4 )H 2 PO 4 with Bi(NO 3 ) 3 ·5H 2 The mol ratio of O is 1:1; Wherein, rate of addition is 0.2mL / min;

[0043] 5. Heat the mixed solution D in a water bath while stirring, the temperature is 65°C, the stirring time is 4h, and the stirring speed is 200r / min...

Embodiment 3

[0046] 1. Put the powder material of 811NCM in the mixed solution of ethanol and deionized water (1:1 volume ratio) for ultrasonic dispersion for 1 hour to form solution A; the concentration of 811NCM solution is 20mg / mL;

[0047] 2. Weigh Bi(NO 3 ) 3 ·5H 2 O, dissolved in deionized water to form solution B; where 811NCM and Bi(NO 3 ) 3 ·5H 2 The molar ratio of O is 100:1, Bi(NO 3 ) 3 ·5H 2 The concentration of O aqueous solution is 2mg / mL;

[0048] 3. Add solution A dropwise to solution B, stir and mix for 1 hour to form solution C;

[0049] 4. (NH 4 )H 2 PO 4 Aqueous solution (concentration is 0.47mg / mL), in stirring process, drips into solution C drop by drop, obtains mixed solution D; Wherein (NH 4 )H 2 PO 4 with Bi(NO 3 ) 3 ·5H 2 The mol ratio of O is 1:1; Wherein, rate of addition is 10mL / min;

[0050] 5. Heat the mixed solution D in a water bath while stirring. The temperature is 90°C, the stirring time is 30min, and the stirring speed is 1000r / min. Th...

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Abstract

The invention discloses a positive electrode material and a preparation method thereof, a lithium ion battery. The preparation method of the bismuth phosphate coated 811NCM material is as follows: sintering the coated precursor to obtain the bismuth phosphate coated 811NCM material. The coated precursor is obtained by mixing 811 NCM solution, Bi (NO3) 3 *5 H 2 O aqueous solution and (NH4) H2PO4 aqueous solution. The molar ratio of 811NCM to Bi (NO3) 3 *5 H2O is 300: 1 - 100: 1. The molar ratio of 811NCM to Bi (NO3) 3 * 5 H2O is 300: 1 - 100: 1. The molar ratio of 811NCM to Bi (NO3) 3*5 H2Ois 100: 1. The raw material of the invention is cheap and easy to obtain, and the cost is low. The preparation method is simple and convenient for large-scale production. The coating can reduce the surface alkalinity of 811NCM, reduce the contact between electrolyte and active material, and inhibit the erosion of HF in electrolyte. The obtained BiPO_4 coated 811NCM material has excellent cycle stability and can be used as positive electrode material for high energy density batteries.

Description

technical field [0001] The present invention relates to a kind of anode material and preparation method, lithium ion battery, specifically relate to a kind of bismuth phosphate (BiPO 4 ) coated LiNi 0.8 co 0.1 mn 0.1 o 2 Materials and preparation methods, lithium-ion batteries. Background technique [0002] High nickel ternary material LiNi 0.8 co 0.1 mn 0.1 o 2 (hereinafter referred to as 811NCM) has a high capacity and has been paid more and more attention by people. However, due to the high nickel content of the material, the surface of the material is highly alkaline, easy to absorb water, and has side reactions with the electrolyte, which affects its cycle stability. Chinese patent application CN105680015A provides a positive electrode material with lanthanum oxide coated on the surface of the ternary material and its preparation method, but in the preparation process, the solid phase sintering method is used, which is difficult to control the particle size of t...

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
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 蒿豪周兰李劲张思文
Owner SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
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