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Phosphorus-doped silicon-based lithium ion battery negative electrode material as well as preparation method and application thereof

A silicon-based negative electrode material and phosphorus doping technology, applied in the field of materials, can solve problems such as limiting the rate performance of silicon oxide, and achieve the effects of reducing irreversible capacity, high powder conductance, and improving powder conductance

Pending Publication Date: 2021-11-12
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the ionic conductivity limits the improvement of the rate performance of silicon oxide

Method used

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  • Phosphorus-doped silicon-based lithium ion battery negative electrode material as well as preparation method and application thereof
  • Phosphorus-doped silicon-based lithium ion battery negative electrode material as well as preparation method and application thereof
  • Phosphorus-doped silicon-based lithium ion battery negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 provides a soft carbon-coated phosphorus-doped silicon-based negative electrode material.

[0047] The phosphorus-doped silicon-based anode material coated with soft carbon in this embodiment is designated as sample 1#. It is composed of 95wt% silicon oxide, 2wt% tripotassium phosphate and 3wt% soft carbon coated outside.

[0048] The specific preparation process is as follows: the primary product is obtained by mechanically mixing tripotassium phosphate and silicon oxide in the above ratio, and then the primary product is placed in a high-temperature rotary furnace under an argon atmosphere and heated to 1000°C, and the volume ratio is 1:1. Argon and propylene equivalent to the argon were subjected to chemical vapor deposition, kept for 2 hours, and the gas source was turned off to lower the temperature to obtain negative electrode material sample 1#.

[0049] The obtained negative electrode material, conductive additive carbon black, and binder (1:1 sodi...

Embodiment 2

[0053] Embodiment 2 provides a soft carbon-coated phosphorus-doped silicon-based negative electrode material.

[0054] The phosphorus-doped silicon-based anode material coated with soft carbon in this embodiment is designated as sample 2#. It is composed of 93.8wt% doped silicon oxide, 2.4wt% phosphorus pentoxide and 3.8wt% soft carbon coated outside.

[0055] The specific preparation process is as follows: the primary product is obtained by mechanical ball milling of phosphorus pentoxide and doped silicon oxide in the above ratio, and then the primary product is placed in a high-temperature rotary furnace under an argon atmosphere and heated to 1000°C, according to the volume ratio of 1: 1 Pass in propane equal to the amount of argon to carry out chemical vapor deposition, keep warm for 2.5 hours, turn off the gas source and cool down to obtain sample 2#.

[0056] The preparation of the negative electrode sheet, battery assembly and testing process are the same as in Example...

Embodiment 3

[0059] Embodiment 3 provides a soft carbon-coated phosphorus-doped silicon-based negative electrode material.

[0060] The phosphorus-doped silicon-based anode material coated with soft carbon in this embodiment is designated as sample 3#. It is composed of 96.5wt% modified silicon oxide, 0.8wt% sodium pyrophosphate and 2.7wt% soft carbon coated outside.

[0061] The specific preparation process is as follows: Sodium pyrophosphate and modified silicon oxide are spray-dried to the primary product in the above ratio, and then the primary product is placed in a high-temperature rotary furnace under an argon atmosphere and heated to 950°C, and the volume ratio is 1:1. Enter a mixed gas of methane and propylene equal to that of argon for chemical vapor deposition, keep the temperature for 3 hours, turn off the gas source and lower the temperature to obtain sample 3#. In the mixed gas, the ratio of methane and propylene is 2:1.

[0062] The preparation of the negative electrode sh...

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Abstract

The invention relates to a phosphorus-doped silicon-based lithium ion battery negative electrode material and a preparation method and application thereof, the phosphorus-doped silicon-based negative electrode material is a powder material, and the powder conductivity is 3.0 S / cm to 6.0 S / cm; the phosphorus-doped silicon-based negative electrode material comprises 90 wt%-99.49 wt% of a silicon-based powder material, 0.01 wt%-3 wt% of a phosphorus-containing doped material doped in the silicon-based powder material, and 0.5 wt%-7 wt% of a soft carbon material, the silicon-based powder material is specifically a powder material containing electrochemical activity and comprises one or more of a nano silicon-carbon composite material, silicon monoxide, modified silicon monoxide, doped silicon monoxide and amorphous silicon alloy; the phosphorus-containing doping material comprises one or more of sodium dihydrogen phosphate, tripotassium phosphate, phosphorus pentoxide, sodium pyrophosphate, potassium pyrophosphate and sodium metaphosphate; and the soft carbon material coats the outer surface of the silicon-based powder material to form a coating carbon layer of the phosphorus-doped silicon-based negative electrode material.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a phosphorus-doped silicon-based lithium-ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] Among lithium-ion anode materials, silicon is one of the anode materials with great potential at present. Compared with the traditional graphite negative electrode (372mAh / g), the silicon negative electrode has a higher theoretical specific capacity (4200mAh / g). At present, although silicon-based anode materials can achieve satisfactory energy density, there are also technical bottlenecks in materials. Silicon-based anode materials have a series of shortcomings such as volume expansion effect and poor conductivity, which limit their practical applications. The conductivity of silicon-based anode materials is closely related to the rate performance of lithium-ion battery materials. As far as the current situation is c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 潘明军刘柏男罗飞
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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