An anode material for compound lithium ion battery

A technology for ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor conductivity, achieve good rate performance, high discharge specific capacity, and improved discharge performance

Inactive Publication Date: 2008-09-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor conductivity of this type of material has always limited the application of this material.

Method used

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  • An anode material for compound lithium ion battery
  • An anode material for compound lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] FePO 4 ·xH 2 O. Li 2 CO 3 , V 2 o 5 and NH 4 h 2 PO 4 As a raw material, according to the obtained composite cathode material composition M=15LiFePO 4 +Li 3 V 2 (PO 4 ) 3 The molar ratio of ingredients, and mixed evenly, after mechanical activation, into the tube furnace, under the condition of argon atmosphere temperature of 600 ℃, constant temperature for 12 hours. The obtained composite cathode material was analyzed by X-ray diffraction as LiFePO 4 and Li 3 V 2 (PO 4 ) 3 Both phases coexist. The resulting product was formed into a button battery to measure its charge-discharge specific capacity and cycle performance. The first charge-discharge capacity and the discharge capacity after 50 cycles of discharge at the rate of 0.1C, 1C, 2C, 5C and 10C are as follows:

[0014] Sample charge and discharge test results in table 1 example 1

[0015]

Embodiment 2

[0017] FeC 2 o 4 2H 2 O. Li 2 CO 3 , LiF, V 2 o 5 and (NH 4 ) 2 HPO 4 As a raw material, according to the obtained composite cathode material composition M=25LiFePO 4 +LiVPO 4 F molar ratio ingredients, and mixed evenly, after mechanical activation, put into tube furnace, under the condition of argon atmosphere temperature of 700 ℃, keep the temperature constant for 5 hours. The obtained composite cathode material was analyzed by X-ray diffraction as LiFePO 4 and LiVPO 4 F two phases coexist. The resulting product was formed into a button battery to measure its charge-discharge specific capacity and cycle performance. When the charge-discharge test was performed at 0.1C, the discharge specific capacity reached 165mAh·g -1 , the discharge specific capacity after 50 cycles is 164.6mAh·g -1 , The capacity retention rate reaches 99.76%.

Embodiment 3

[0019] LiFePO 4 as the matrix, Li 3 V 2 (PO 4 ) 3 coated in LiFePO 4 Particle surface, LiFePO 4 with Li 3 V 2 (PO 4 ) 3 The molar ratio is 100:1. The resulting product was formed into a button battery to measure its charge-discharge specific capacity and cycle performance. When the charge-discharge test was performed at 0.1C, the discharge specific capacity reached 155mAh·g -1 , after 50 cycles, the discharge specific capacity is 150mAh·g -1 , The capacity retention rate reaches 96.7%.

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Abstract

The invention discloses a positive electrode material for a compound lithium ion battery. LiFePO4 is adopted as matrix, and Li3V2 (PO4)3 or LiVPO4F is adopted to wrap the surface of LiFePO4 particles or to exist among LiFePO4 particles or to directly form a solid solution with LiFePO4, and the molar ratio of LiFePO4 and Li3V2 (PO4)3 or LiVPO4F is (1-100):(100-1). The compound lithium ion battery of the invention has excellent performances of charge/discharge and magnification, and the positive electrode material of the compound lithium ion battery is suitable for producing power cells.

Description

technical field [0001] The invention relates to a battery, in particular to a composite lithium ion battery cathode material. Background technique [0002] The positive electrode material is the most critical and costly part in the research of lithium-ion batteries. Currently, there are three types of positive electrode materials for lithium-ion batteries on the market: lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide. Among them, lithium cobalt oxide is the mainstream material, but cobalt is highly toxic, and cobalt resources are seriously scarce and expensive; and lithium nickel oxide is difficult to prepare products with a certain stoichiometric ratio due to harsh synthesis conditions; layered lithium manganese oxide is It has a specific capacity of more than 200mAh / g, but its structural stability is very poor, while the specific capacity of spinel lithium manganese oxygen is very low, and its structural stability at high temperature needs to be str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48
CPCY02E60/10
Inventor 李新海郑俊超王志兴郭华军彭文杰胡启阳张云河刘久清王志国李金辉
Owner CENT SOUTH UNIV
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