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Compound for pre-lithiation, preparation method of compound, positive electrode pre-lithiation material, preparation method of positive electrode pre-lithiation material and lithium battery

A compound and lithium battery technology, used in the field of energy storage, can solve the problems of poor air stability of binary lithium-containing compounds and difficult industrial application.

Pending Publication Date: 2021-11-09
SONGSHAN LAKE MATERIALS LAB +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, binary lithium-containing compounds have poor air stability and are difficult to realize industrial applications; ternary lithium-containing compounds are generally highly alkaline and have a high decomposition potential, but ternary lithium-containing compounds need further optimization and screening

Method used

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  • Compound for pre-lithiation, preparation method of compound, positive electrode pre-lithiation material, preparation method of positive electrode pre-lithiation material and lithium battery
  • Compound for pre-lithiation, preparation method of compound, positive electrode pre-lithiation material, preparation method of positive electrode pre-lithiation material and lithium battery
  • Compound for pre-lithiation, preparation method of compound, positive electrode pre-lithiation material, preparation method of positive electrode pre-lithiation material and lithium battery

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preparation example Construction

[0061] Some embodiments of the present application provide a method for preparing a compound for pre-lithiation, comprising the following steps:

[0062] Step S1, mixing the M source and the lithium source.

[0063] Further, when the M source is mixed with the lithium source, the mixing is carried out according to the molar ratio of metal element M:Li=y:[x*(1.2-0.8)].

[0064] In some embodiments of the present application, the M source and the lithium source are uniformly mixed or ground according to the molar ratio of metal element M: Li = y: [x*(1.2-0.8)] to obtain a mixture.

[0065] Further optionally, the M source and the lithium source are uniformly mixed or ground according to the molar ratio of metal element M:Li=y:[x*(1.15-0.85)] to obtain a mixture.

[0066] Exemplarily, the M source and the lithium source are in accordance with the metal element M: Li molar ratio = y: [x*1.0]; M: Li molar ratio = y: [x * 1.05]; M: Li molar ratio = y: [x*0.9]; uniformly mixed or g...

Embodiment 1

[0105] Step S1, preparing the positive electrode pre-lithiation material Li 5 NbO 5 .

[0106] Weigh Nb 2 o 5 1g, LiOH·H 2 O 1.6g, mixed powder was obtained after mixing and grinding, and then the mixed powder was sintered at 900°C for 10 hours to prepare the positive electrode pre-lithiated material Li 5 NbO 5 , scanning electron microscope picture as figure 1 shown.

[0107] Step S2, detecting the positive electrode pre-lithiated material Li 5 NbO 5 When used as a positive pole piece, the lithium battery charge and discharge performance.

[0108] 0.7g of Li prepared in step S1 5 NbO 5 Mix with 1.5g of carbon black and 1.5g of PVDF, add 1g of NMP (N-methylpyrrolidone) to make a slurry, coat and dry to assemble the battery. Wherein, the electrolyte formula is 1M LiPF6 EC / DMC, and 1wt% vinylene carbonate is added in the electrolyte. The charge and discharge curve of the battery test is as follows: figure 2 and as shown in Table 1, Li 5 NbO 5 Charge specific ca...

Embodiment 2

[0119] Step S1, preparing the positive electrode pre-lithiation material Li 8 Nb 2 o 9 .

[0120] Weigh Nb 2 o 5 1g, LiOH·H 2 O 1.3g, mixed powder was obtained after mixing and grinding, and then the mixed powder was sintered at 900°C for 10 hours to prepare the positive electrode pre-lithiated material Li 8 Nb 2 o 9 .

[0121] Step S2, detecting the positive electrode pre-lithiated material Li 8 Nb 2 o 9 When used as a positive pole piece, the lithium battery charge and discharge performance.

[0122] Mix 0.7g of the positive electrode pre-lithiated material prepared in step S1 with 1.5g of carbon black and 1.5g of PVDF, add 1g of NMP (N-methylpyrrolidone) to make a slurry, coat and dry to assemble the battery. Wherein, the electrolyte formula is 1M LiPF6 EC / DMC, and 1wt% vinylene carbonate is added in the electrolyte. The battery was tested for charging and discharging, and the test results are shown in Table 2. Step S3, detecting that the positive electrode p...

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Abstract

The invention relates to the technical field of energy storage, and relates to a compound for pre-lithiation, a preparation method of the compound, a positive electrode pre-lithiation material, a preparation method of the positive electrode pre-lithiation material, and a lithium battery. The chemical formula of the compound is LixMyOz, wherein x is more than or equal to 3 and less than or equal to 12, y is more than or equal to 1 and less than or equal to 2, z is more than or equal to 4 and less than or equal to 11, and M is one or more selected from a group consisting of Nb, Ta, Zr, W, Sn, V, Ru, Ce or Bi. When the compound is used as a positive electrode pre-lithiation material, a decomposition potential is relatively low, charging specific capacity is high, a discharging process is irreversible, a relatively good lithium battery in-situ pre-lithiation effect can be realized, and the compound has good air stability, is compatible with an existing lithium battery production process and has a commercial application prospect. According to the lithium battery adopting the positive electrode pre-lithiation material, in the charging process of the battery, the compound is irreversibly decomposed to release active lithium ions, so active lithium loss caused by negative electrode SEI growth is supplemented, and the effects of improving the energy density of the lithium battery and prolonging the cycle life of the lithium battery can be achieved.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular, to a compound for pre-lithiation and a preparation method thereof, a positive electrode pre-lithiation material and a preparation method thereof, and a lithium battery. Background technique [0002] During the first cycle of lithium-ion energy storage devices, due to the formation of solid electrolyte interface (SEI) at the negative electrode interface, irreversible capacity loss occurs, and the reduction of active lithium content will lead to a decrease in the energy density of lithium-ion energy storage devices. In high specific energy storage devices, anode materials often need to choose materials with higher specific capacity to increase energy density, such as alloy anodes with high specific capacity. However, compared with the graphite anode, the alloy anode needs to consume more active lithium during the first charging process, which reduces the coulombic e...

Claims

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Application Information

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IPC IPC(8): C01G33/00C01G55/00C01G25/00C01G31/00C01G19/00C01G29/00C01G41/00C01G35/00C01F17/32C01F17/10B82Y40/00H01M4/58H01M10/0525
CPCC01G33/00C01G55/00C01G25/00C01G31/00C01G19/00C01G29/00C01G41/00C01G35/00C01F17/32C01F17/10B82Y40/00H01M4/5825H01M10/0525H01M2004/028C01P2006/40C01P2004/64C01P2004/62C01P2004/61Y02E60/10
Inventor 闫勇黄学杰田孟羽
Owner SONGSHAN LAKE MATERIALS LAB
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