BN-coated cobalt-free Ni-Mn solid solution Ni-based positive electrode material

A cathode material and coating technology, which is applied in the field of BN-coated cobalt-free Ni-Mn solid-solution nickel-based cathode materials, can solve the problems of high preparation cost, difficulty in large-scale production, and poor uniformity of ion distribution, so as to improve cycle performance , strong acid resistance, and the effect of stabilizing the material structure

Active Publication Date: 2016-12-28
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis process of the solid-phase method is simple, but the uniformity of ion distribution is poor, and the batch stability is not good; the sol-gel method can achieve uniformity at the molecular level, using a large number of molecular alkoxides, and the preparation cost is relatively high, so it is only suitable for experimental research , these methods have greatly limited their large-scale production and commercial applications are difficult to large-scale production

Method used

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  • BN-coated cobalt-free Ni-Mn solid solution Ni-based positive electrode material
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  • BN-coated cobalt-free Ni-Mn solid solution Ni-based positive electrode material

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Experimental program
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Embodiment approach

[0037] A BN-coated cobalt-free Ni-Mn solid-solution nickel-based positive electrode material, the structural formula of which is: LiNi x mn 1-x o 2 ·a BN, where 0.5≤ x x mn 1-x o 2 A coating on the surface of a material.

[0038] The preparation method comprises the following steps:

[0039] (1) Weigh the nickel salt and the manganese salt according to the ratio, dissolve the nickel salt and the manganese salt in deionized water, prepare a transition metal source solution, and adjust the pH of the solution to 7~7.2 with ammonia water; the nickel salt is selected from chlorine One or more of nickel oxide, nickel sulfate, nickel nitrate, nickel acetate. The manganese salt is selected from one or more of manganese chloride, manganese sulfate, manganese nitrate and manganese acetate.

[0040] (2) Precipitant plus deionized water is prepared into a primary solution with a system of 0.1-10moL / L, and a complexing agent is added to the primary to mix to obtain a precipitant sol...

Embodiment 1

[0049] NiSO 4 , MnSO 4 Dissolve in deionized water at a molar ratio of 0.8:0.2 to make 2mol L -1 Transition metal source solution, the precipitant NaOH was dissolved in deionized water to prepare 4mol L -1 NaOH solution, add ammonia water accounting for 5% of the volume of the sodium hydroxide solution to the NaOH solution, pump the transition metal source solution and the sodium hydroxide solution into the reactor at a flow rate of 50mL / h at the same time, and control the temperature of the reactor to 55 ℃, the reaction pH value is 11.3, carry out co-precipitation reaction, keep stirring at the reaction temperature for 3 hours after the reaction is completed, then let it stand for 8 hours, wash the precipitate with deionized water while suction filtering until the precipitated impurity content is less than 400ppm, and obtain after drying Precursor Ni 0.8 mn 0.2 (OH) 2 .

[0050] Precursor and lithium hydroxide are according to the ratio of the molar number of lithium t...

Embodiment 2

[0055] LiNi 0.8 mn 0.2 o 2 The preparation process of the material is the same as in Example 1.

[0056] 50 g of cathode material LiNi 0.8 mn 0.2 o 2 Dissolve in ethanol solution of diboron trioxide, wherein the quality of diboron trioxide is 0.54g, ethanol is 800ml, at 800 rad min -1 The stirring rate was set at 70 °C, and the solution was evaporated to dryness within 5 h to obtain a modified nickel-based cathode material coated with boron trioxide.

[0057] The modified nickel-based cathode material coated with diboron trioxide was placed in a tube atmosphere furnace at 5°C min -1 The heating rate rises to 600-850°C at a flow rate of 500cm 3 min -1 Under nitrogen protection conditions, with a flow rate of 200 cm 3 min -1 Ammonia reacts, the reaction time is 4h, and the temperature is lowered to room temperature, and LiNi with a BN coating amount of 1%wt is obtained 0.8 mn 0.2 o 2 0.018BN.

[0058] Will LiNi 0.8 mn 0.2 o 2 0.009BN cathode material assembled...

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Abstract

The invention discloses a BN-coated cobalt-free Ni-Mn solid solution Ni-based positive electrode material. The BN-coated cobalt-free Ni-Mn solid solution Ni-based positive electrode material has a structural formula of LiNixMn1-xO2. a BN. In the structural formula, x is greater than or equal to 0.5 and less than 1, a is greater than 0 and is less than or equal to 0.06 and BN is a coating on the surface of the LiNixMn1-xO2 material. The positive electrode material is coated with BN. The coating can effectively prevent direct contact between a positive electrode material and an electrolyte, has strong acid resistance, can inhibit dissolution of material manganese ions in the electrolyte, realizes a stable material structure and improves material cycling performances.

Description

technical field [0001] The invention relates to a positive electrode material, in particular to a BN-coated cobalt-free Ni-Mn solid solution nickel-based positive electrode material. Background technique [0002] The energy density of lithium-ion batteries, that is, the amount of energy stored per unit weight of the battery, often depends on the specific capacity of the positive electrode material. At present, commercial lithium-ion batteries mainly use lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), lithium iron phosphate (LiFePO 4 ) etc. as the positive electrode material, the specific capacity is only 90-140 mAh g -1 , it is difficult to meet the high energy density requirements of power batteries, and cobalt resources are limited and toxic, which is contrary to environmental friendliness. [0003] LiNiO 2 Has a high actual specific capacity (190-210 mAh g -1 ), a layered α-NaFeO 2 structure (space group:) but its thermal stability is poor, and t...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M4/628Y02E60/10
Inventor 陈鹏任宁李洪涛孙延先
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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