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Preparation method for high-capacity Sn-Ni alloy compound as lithium ion battery negative electrode material

A technology for lithium ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of complex preparation process, low yield and high cost, and achieve simple process, high yield and high specific capacity. Effect

Inactive Publication Date: 2006-11-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, alloy anode materials are mostly prepared by chemical liquid phase reduction, high-energy ball milling, electrodeposition or chemical thermal decomposition, so the preparation process is complex, time-consuming, high cost, and low yield

Method used

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  • Preparation method for high-capacity Sn-Ni alloy compound as lithium ion battery negative electrode material
  • Preparation method for high-capacity Sn-Ni alloy compound as lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] with SnO 2 (purity > 99.9%), NiO (purity > 99.9%), and activated carbon (purity > 99%) are the initial raw materials, and the molar ratio is 3: 1: 7.5 (equivalent to Sn: Ni atomic ratio is 3: 1 ), after the mixture was ground evenly, it was placed in a flowing argon atmosphere and raised to 900°C at a rate of 5°C / min, and kept for 2 hours, then turned off and cooled to room temperature naturally. The XRD phase analysis results of the obtained sample show that the synthetic product is Sn / Ni 3 sn 2 / Ni 3 sn 4 Alloy composite without any oxide impurity phase.

[0016] Add 10wt% conductive agent acetylene black and 10wt% binder PVDF to the synthesized material to make a slurry, evenly spread it on the copper foil, after drying, card it into a circular pole piece, and form a test battery with metal lithium. Carry out constant current charge and discharge experiments, the charge and discharge current is 100mA / g, and the charge and discharge voltage range is controlled be...

Embodiment 2

[0018] with SnO 2 (purity > 99.9%), NiO (purity > 99.9%), and activated carbon (purity > 99%) are the initial raw materials, and the molar ratio is 2: 1: 5.3 for batching (the atomic ratio of Sn: Ni is 2: 1) After grinding the mixture evenly, place it in a flowing argon atmosphere, raise the temperature to 1000°C at a rate of 10°C / min, keep it warm for 1 hour, then turn off the power, and cool it down to room temperature naturally. The XRD phase analysis of the obtained sample shows that the synthetic product is Ni / Ni 3 sn 2 / Ni 3 sn 4 Alloy composite without any oxide impurity phase.

[0019] Add 13wt% conductive agent acetylene black and 12wt% binder PVDF to the synthesized material to make a slurry, evenly coat it on copper and platinum, after drying, clamp it into a circular pole piece, and form a test battery with metal lithium. Carry out constant current charge and discharge experiments, the charge and discharge current is 100mA / g, and the charge and discharge volta...

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Abstract

The invention discloses a preparing method of high-capacitance Sn-Ni alloy composite Li ion battery negative electrode material in the Li ion battery domain, which comprises the following steps: matching Sn and Ni oxide in the alloy composition according to proportion; adding fitful proportional carbon powder as reducer; grinding composition evenly; placing the composition in the flowing inert argon environment at 5-30 deg.c per min to 800-1200 deg.c for 1-6 h; interrupting; cooling the furnace to indoor temperature. The invention simplifies the preparing technology and reduces the cost, which produces high-specific content and stable circulation property Sn-Co Li ion battery negative material.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular provides a method for preparing a high-capacity Sn-Ni alloy composite lithium-ion battery negative electrode material, which uses a carbothermal reduction method to prepare Sn-Ni alloy powder materials from metal oxides for use as Lithium-ion battery anode materials have high specific capacity and good cycle performance. Background technique [0002] Lithium-ion battery is the latest generation of rechargeable battery developed after MH-Ni battery since the 1990s. It has high working voltage, high energy density, good safety, light weight, small self-discharge, long cycle life, no memory effect, No pollution and other advantages. At present, it is widely used in mobile phones, notebook computers, handheld computers and military special electronic equipment and other fields. The annual output and output value have increased very rapidly, and it has become a focus of modern n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C13/00C22C19/00H01M4/04H01M4/36
CPCY02E60/10
Inventor 赵海雷郭洪尹朝丽仇卫华贾喜娣
Owner UNIV OF SCI & TECH BEIJING
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