A kind of composite negative electrode material of high-capacity lithium-ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, batteries, secondary batteries, etc., can solve the problems of poor cycle performance, low charge-discharge specific capacity, etc., and achieve low cost, easy operation, and low requirements for reaction conditions Effect

Active Publication Date: 2016-08-03
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of low charge-discharge specific capacity and poor cycle performance of existing carbon materials as negative electrode materials for power lithium-ion batteries, and provides a composite negative electrode material for high-capacity lithium-ion batteries. The electric capacity of the composite negative electrode material is Large, good cycle performance and stability

Method used

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  • A kind of composite negative electrode material of high-capacity lithium-ion battery and preparation method thereof
  • A kind of composite negative electrode material of high-capacity lithium-ion battery and preparation method thereof
  • A kind of composite negative electrode material of high-capacity lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Mill silicon balls with a particle size of 20-30 μm in an ethanol medium at a high speed of 300 rpm for 3 hours, then dry at 100°C to obtain silicon powder with a particle size of 0.1-10 μm, and weigh 20 g of ball-milled silicon powder. Silicon fume, by Si / SnC 2 o 4 Medium Si and SnC 2 o 4 The mass ratio is 1:1 to calculate the SnC 2 o 4 The required mass, that is, 20gSnC 2 o 4 , according to the calculated SnC 2 o 4 The required mass, according to the reaction of soluble stannous salt and soluble oxalate to generate SnC 2 o 4 The chemical reaction proportioning metering soluble stannous salt, wherein, soluble stannous salt is stannous chloride, and soluble oxalate is sodium oxalate, obtains 18.4g stannous chloride, silicon powder and the stannous chloride of metering gained Add 60g of water to obtain 98.4g of suspension.

[0033] (2) According to the reaction of soluble stannous salt and soluble oxalate to generate SnC 2 o 4 The chemical reaction ratio...

Embodiment 2

[0040] The rest of the steps of Example 2 are exactly the same as Example 1, the difference is that Si / SnC 2 o 4 After that, press Si / SnC 2 o 4 The mass percentage composition of carbon elemental substance in / C is 10% to measure carbon material, and carbon material is conductive carbon black, and the Si / SnC that carbon material and obtain 2 o 4 After mixing, high-speed ball milling at 100 rpm for 3 hours to obtain Si / SnC particles with a particle size of 0.5-30 μm 2 o 4 / C.

[0041] The resulting Si / SnC 2 o 4 The SEM image of / C is as follows image 3 shown, from image 3 It can be seen that Si is replaced by SnC 2 o 4 After coating, a large particle structure with smooth surface is formed, while C (flaky substance) is uniformly dispersed in Si / SnC 2 o 4 (particles).

[0042] The resulting Si / SnC 2 o 4 / C is used for the negative electrode of lithium-ion batteries. The cycle performance test is carried out under the conditions of 25°C, 0.1C charge and discharg...

Embodiment 3

[0045] (1) Mill silicon balls with a particle size of 20-30 μm in an ethanol medium at a high speed of 360 rpm for 2.5 hours, then dry at 105°C to obtain silicon powder with a particle size of 0.1-10 μm, weigh 100 g after ball milling silicon powder, according to Si / SnC 2 o 4 Medium Si and SnC 2 o 4 The mass ratio of 1:10 calculated SnC 2 o 4 The required quality, that is, 1000gSnC 2 o 4 , according to the calculated SnC 2 o 4 The required mass, according to the reaction of soluble stannous salt and soluble oxalate to generate SnC 2 o 4 The chemical reaction ratio metering soluble stannous salt, wherein, soluble stannous salt is stannous sulfate, and soluble oxalate is potassium oxalate, obtains 1038.7g stannous sulfate, adds silicon powder and the stannous sulfate that metering gains in 4200g water , to obtain 5338.7g suspension.

[0046] (2) According to the reaction of soluble stannous salt and soluble oxalate to generate SnC 2 o 4 The chemical reaction ratio, ...

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Abstract

The invention discloses a high-capacity lithium ion battery composite negative electrode material and a preparation method thereof, wherein problems of low charging-discharging specific capacity and poor cycle performance of application of the existing carbon material as the lithium ion battery negative electrode material are solved. According to the present invention, the high-capacity lithium ion battery composite negative electrode material is a composite powder material comprising a component Si / SnC2O4 or Si / SnC2O4 / C, wherein silicon powder, a soluble stannous salt and a soluble oxalate are subjected to a mixing reaction, the obtained solid is dried to obtain Si / SnC2O4, a carbon material is added according to a ratio, and ball milling is performed to obtain Si / SnC2O4 / C; the particle size of the material is 0.5-30 mum, a mass ratio of Si to SnC2O4 is 1:10-10:1 in Si / SnC2O4 or Si / SnC2O4 / C, and the mass percent content of the elemental carbon in Si / SnC2O4 / C is 5-90%; and the high-capacity lithium ion battery composite negative electrode material has characteristics of high electricity capacity, good cycle performance and good stability, and the preparation method has characteristics of simple process step, easy operation and low production cost.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a composite negative electrode material of a high-capacity lithium-ion battery and a preparation method thereof. Background technique [0002] With the rapid development of pure electric vehicles and hybrid electric vehicles, the demand for high energy density and high safety lithium-ion batteries is very urgent. At present, the negative electrode materials of commercialized power lithium-ion batteries are usually carbon materials such as graphite and acetylene black. , but the charge-discharge specific capacity of carbon materials is low (theoretical capacity 372mAh / g), and it has been developed close to the theoretical value. Turn to find new anode materials that can replace carbon materials to achieve high safety, large capacity and long cycle life of lithium-ion batteries. [0003] Application publication number CN102208638A, the patent application publication ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/62
CPCH01M4/364H01M4/625H01M10/0525H01M2220/20Y02E60/10
Inventor 石先兴葛民民吕豪杰谭东庆陈军
Owner WANXIANG 123 CO LTD
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