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Positive electrode material for silicon-based battery, and preparation method and application of positive electrode material

A positive electrode material and battery technology, which is applied in the field of silicon-based battery positive electrode materials and its preparation, can solve the problems of high production cost, low production cost, and high difficulty of pre-lithiation technology, and achieve high production cost and reduced process complexity. and the effect of production difficulty

Pending Publication Date: 2022-05-13
高点(深圳)科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] One of the purposes of the present invention is to provide a positive electrode material for silicon-based batteries to solve the problems of high difficulty in pre-lithiation technology and high production costs in current silicon-based lithium-ion batteries. By using the positive electrode material of the present invention, silicon-based Lithium-ion batteries not only do not require additional lithium supplementation, but also have low production costs, high capacity, and a higher degree of matching with silicon negative electrodes

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  • Positive electrode material for silicon-based battery, and preparation method and application of positive electrode material
  • Positive electrode material for silicon-based battery, and preparation method and application of positive electrode material
  • Positive electrode material for silicon-based battery, and preparation method and application of positive electrode material

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preparation example Construction

[0037] The second aspect of the present invention provides a method for preparing the positive electrode material for silicon-based batteries, comprising the following steps:

[0038] S1. Mix nickel salt, manganese salt and M salt to prepare the first solution, respectively add the first solution and the alkaline solution into the reactor in an inert gas to stir and react, and control the pH of the solution to 7-13; after feeding Continue to stir and age for 18-26 hours, vacuum filter, wash, and dry to obtain the precursor;

[0039] S2. Mix the precursor obtained in step S1 with the lithium salt and put it into a reaction furnace, react at 450-900° C. for 8-24 hours, cool and grind to obtain a positive electrode material for a silicon-based battery.

[0040] The second aspect of the present invention provides another method for preparing the positive electrode material for silicon-based batteries, comprising the following steps:

[0041] S1. Mix the nickel salt and the mangan...

Embodiment 1

[0057] A kind of anode material for silicon-based battery, its chemical formula is Li 1.05 Ni 0.8 mn 0.1 co 0.05 Al 0.05 o 2 .

[0058] The preparation method of the positive electrode material for the silicon-based battery is as follows:

[0059] S1. Prepare NiSO at a molar ratio of 8:1:0.5:0.5 4 , MnSO 4 、CoSO 4 , (Al) 2 (SO 4 ) 3 aqueous solution (Ni 2+ , Mn 2 + 、Co 2+ 、Al 3+ The total concentration of 2mol L -1 )500mL, recorded as the first solution; prepare 4mol L -1 500mL of NaOH solution is used as the alkaline solution; in an inert gas at 30-80°C, the first solution and the alkaline solution are added to a five-necked flask with 100mL deionized water through a peristaltic pump at a speed of about 1mL / min Stir the reaction in the reactor, and the stirring speed is 500rpm / min. During the reaction, the pH of the solution is controlled by dropping ammonia water=10~13; after adding the materials, continue to stir and age for 24h; after the aging is complet...

Embodiment 2

[0062] A kind of anode material for silicon-based battery, its chemical formula is Li 1.05 Ni 0.6 mn 0.35 co 0.05 o 2 .

[0063] The preparation method of the positive electrode material for the silicon-based battery is as follows:

[0064] S1, prepare NiSO according to 6:3.5:0.5 4 , MnSO 4 、CoSO 4 aqueous solution (Ni 2+ , Mn 2+ 、Co 2+ The total concentration is 2molL -1 )500mL, recorded as the first solution; prepare 4mol L -1 500mL of NaOH solution is used as the alkaline solution; in an inert gas at 30-80°C, the first solution and the alkaline solution are added to a five-necked flask with 100mL deionized water through a peristaltic pump at a speed of about 1mL / min Stir the reaction in the reactor, and the stirring speed is 500rpm / min. During the reaction, the pH of the solution is controlled by dropping ammonia water=10~13; after adding the materials, continue to stir and age for 24h; after the aging is completed, the obtained precipitate is vacuum filtered an...

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Abstract

The invention provides a positive electrode material for a silicon battery and a preparation method and application thereof, the chemical formula of the positive electrode material is Li1 + aNibMncMc-dO2, 0 < = a < = 1, 0 < b < 1, 0 < c < 1, 0 < d < 1, d < = c, and b + 2c-d < 1 + a; m is at least one of Ti, Zr, La, Ce, Pr, Nd, Nb, Sm, Al, Mg, Sr, Ba, Co, Zn, Sn, Bi, Sb, Si, Tb, Bi, Yb, Lu, B and Y. Compared with the prior art, the positive electrode material provided by the invention carries a part of lithium and can be used for lithium consumed for generating an SEI film in the first charging process of a silicon negative electrode material, the problems that a current silicon lithium ion battery needs to be pre-lithiated in advance and the production cost is high are solved, and the matching with the silicon negative electrode material is higher.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a positive electrode material for a silicon-based battery and a preparation method and application thereof. Background technique [0002] Lithium-ion battery is a very widely used secondary battery. With the pursuit of high energy density for lithium-ion batteries, especially for power batteries to achieve a specific energy target of 300Wh / kg, silicon (nano Silicon or silicon oxide, etc.) negative electrode. However, there is a fatal problem in silicon-based negative electrode materials. It will form a solid electrolyte film (SEI film) when it first undergoes lithium intercalation reaction, and a part of lithium will be consumed in this process. When the conventional positive electrode material is matched with the silicon negative electrode, a large amount of active lithium released from the positive electrode material during the first charging process will become dead lithium a...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1393H01M4/38H01M10/0525
CPCH01M4/386H01M4/134H01M4/1393H01M10/0525
Inventor 赵孝连方刚曾国城徐健李诗文
Owner 高点(深圳)科技有限公司
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