Method for performing in-situ controllable coating on lithium ion battery electrode material by phenolic resin

A lithium-ion battery and electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of uneven and continuous carbon layer and unsatisfactory coating effect

Active Publication Date: 2014-08-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the coating reaction needs to be carried out under high temperature heating conditions, and it can be seen from

Method used

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  • Method for performing in-situ controllable coating on lithium ion battery electrode material by phenolic resin
  • Method for performing in-situ controllable coating on lithium ion battery electrode material by phenolic resin
  • Method for performing in-situ controllable coating on lithium ion battery electrode material by phenolic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Embodiment 1, utilize method a to carry out carbon layer coating

[0127] 1) Weigh 1.0g (6.34mmol) cathode material LiFePO with a particle size of 150nm 4 In the presence of 30ml H 2 In a mixed solution of O and 15ml EtOH, ultrasonically disperse for 15-30min. Then add 0.05g (0.455mmol) resorcinol solid powder successively, 0.2ml mass percent concentration is the ammoniacal liquor (1.30mmol) of 25% and 0.1ml mass concentration is the formaldehyde aqueous solution (1.34mmol) of 37%, at room temperature Stir for 24h. The precipitate was collected by centrifugation, washed three times with water and once with ethanol, and the obtained precipitate was fully dried in a drying oven at 80°C for 12 hours to obtain the intermediate product a;

[0128]2) Place the dried powder intermediate a (referred to as LFPRF) in a tube furnace with hydrogen-argon gas mixture (5 / 95% by volume), calcinate at 400°C for 4h, and then raise the temperature to 700°C ℃, calcined for 15h, and nat...

Embodiment 2

[0130] Embodiment 2, utilize method a to carry out carbon layer coating

[0131] The difference with Example 1 is:

[0132] Weigh 0.9g LiFePO 4 (5.70mmol), and added 0.065g (0.591mmol) resorcinol solid powder in the reaction system.

[0133] figure 2 It is the LiFePO prepared in this example 4 The transmission electron microscope (TEM) picture of C sample, as can be seen from the figure, the thickness of the coated carbon layer is 3.3nm, and this sample is denoted as LFPC (3.3).

Embodiment 3

[0134] Embodiment 3, utilize method a to carry out carbon layer coating

[0135] The difference with Example 1 is:

[0136] Weigh 0.4g LiFePO 4 (2.54mmol), and added 0.07g (0.636mmol) resorcinol solid powder in the reaction system.

[0137] image 3 It is the LiFePO prepared in this example 4 The transmission electron microscope (TEM) figure of C sample, as can be seen from the figure, the thickness of the coated carbon layer is 5nm, and this sample is denoted as LFPC (5).

[0138] Figure 7 It is the XRD spectrogram of the LFPC sample prepared by the present embodiment, and intermediate product LFPRF and pure LiFePO 4 Compared with the standard spectrum, it can be seen that the synthesized material conforms to the standard card (JCPDS No.81-1173), orthorhombic crystal system, and Pnma space group. Carbon coated LiFePO 4 and LiFePO coated with phenolic resin polymer 4 and uncoated LiFePO 4 There is no difference in the spectrograms, indicating that the coating method ...

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Abstract

The invention discloses a method for performing in-situ controllable coating on a lithium ion battery electrode material by a phenolic resin. The method comprises the following steps: (1) putting a lithium ion battery electrode material or a precursor for synthesizing the lithium ion battery electrode material into a mixed solution of water and ethanol, sequentially adding phenol, ammonia water and aldehyde for stirring at a certain temperature, and drying an obtained precipitate, thereby obtaining an intermediate product; and (2) calcining the intermediate product obtained in the step (1) in an inert atmosphere or a reducing atmosphere, and cooling to room temperature, thereby finishing coating of a carbon layer, or mixing the intermediate product obtained from the precursor in the step (1) with a compound containing lithium ions, grinding, calcining, and cooling to room temperature, thereby finishing coating of the carbon layer. The method is simple and feasible, the thickness of the coated carbon layer can be systematically regulated and optimized, the electronic conductivity and ionic conductivity of a polyanionic positive electrode material are obviously improved, and the cycle performance and rate performance of the material are optimized.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a method for in-situ controllable coating of lithium-ion battery electrode materials with phenolic resin. Background technique [0002] Polyanionic cathode material Li x MxO 4 (M stands for a transition metal element, X stands for phosphorus, silicon or sulfur, and x is a positive number) is an important type of lithium-ion battery material, which is environmentally friendly, low in cost, good in safety, high in specific capacity, and good in cycle stability. And other advantages, especially suitable for power battery applications in electric vehicles, energy storage batteries, etc. However, due to the structural characteristics of this type of material, lithium ions can only be transported along the (010) one-dimensional direction, so the electronic conductivity and ionic conductivity are low, so that electrons cannot be introduced in time during the pr...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M4/38H01M4/485
CPCY02E60/122H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 曹安民池子翔万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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