Anode active material and secondary lithium battery

A technology for positive active materials and lithium secondary batteries, applied in secondary batteries, active material electrodes, battery electrodes, etc., can solve problems such as difficulty in inhibiting the reaction between positive active materials and electrolytes, poor cycle characteristics, and thermal stability problems , to achieve the effect of improving high temperature storage characteristics, preventing dissolution, and increasing discharge potential

Inactive Publication Date: 2010-12-29
ENERCERAMIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these compounds were not commercialized due to the following problems
[0007] 1. LiNiO 2 Difficult to synthesize materials and have problems with thermal stability, so it has not been commercialized
[0008] 2. Although part of LiMn is used on low-priced products 2 o 4 , but LiMn with spinel structure 2 o 4 The theoretical capacity of LiCoO is about 148mAh / g, which is smaller than other materials, and because of its three-dimensional tunnel structure, the diffusion resistance is large when lithium ions are intercalated and extracted, so its diffusion efficiency is higher than that of LiCoO with a two-dimensional structure. 2 and LiNiO 2 Low and poor periodicity due to the Jahn-Teller effect
[0013] Although this surface modification of the positive electrode active material can bring about an excellent effect of improving the electrochemical characteristics, it is difficult to suppress the rapid reaction between the positive electrode active material and the electrolyte at high temperature.

Method used

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  • Anode active material and secondary lithium battery
  • Anode active material and secondary lithium battery
  • Anode active material and secondary lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] (Example 1) preparation has Bi-containing 2 o 3 Positive electrode active material for surface modification layer

[0097] Put 50g of LiMn in the stirred reactor that 600ml distilled water is housed 2 o 4 , followed by NH 4 OH to adjust the pH to 10. Prepare Bi(NO 3 ) 3 ·5H 2 O solution, at this time, relative to 100 mol% LiMn 2 o 4 , using 0.25 mol% Bi(NO 3 ) 3 ·5H 2 O.

[0098] Under the condition of keeping the temperature at 30°C, to the stirring LiMn 2 o 4 Bi(NO 3 ) 3 ·5H 2 O solution. After stirring the resulting mixture for 6 hours, it was filtered to prepare the surface with Bi(OH) 3 LiMn 2 o 4 .

[0099] After drying the obtained compound in a constant temperature bath at 110°C for 12 hours, heat treatment was carried out at 400°C for 5 hours to prepare LiMn 2 o 4 Bi on the surface 2 o 3 surface-modified cathode active materials. In the prepared cathode active material, compared to LiMn 2 o 4 , the Bi 2 o 3 The coating amount is 0...

Embodiment 2

[0101] In addition to changing the active compound to LiMn 1.5 Ni 0.5 o 4 In addition, the same method as in Example 1 was used for surface modification.

Embodiment 3

[0102] (Example 3) Preparation of positive electrode active material with BiOF-containing surface modification layer

[0103] Put NH in a stirred reactor with 600ml of distilled water 4 F and make it dissolve, at this time relative to 100 mol% LiMn 2 o 4 , the NH 4 The dosage of F was 0.75 mol%. Add the LiMn of 50g to the resulting solution afterwards 2 o 4 After using NH 4 OH to adjust the pH to 7.

[0104] Dissolve Bi(NO) in 400ml distilled water 3 ) 3 ·5H 2 O to prepare bismuth compound precursors. At this time, relative to 100 mol% LiMn 2 o 4 , the Bi(NO 3 ) 3 ·5H 2 The amount of O used is 0.25 mol%.

[0105] Under the condition of keeping the temperature at 30° C., the bismuth compound precursor solution was slowly put into the stirred reactor. After stirring the resulting mixture for 6 hours, it was filtered to prepare 4 Bi 3 f 10 LiMn 2 o 4 .

[0106] The resulting product was dried in a constant temperature bath at 110°C for 12 hours, and then he...

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Abstract

The invention relates to an anode active material for a secondary lithium battery and a secondary lithium battery containing the anode active material. The anode active material contains an active compound which can be embedded with and separated from a lithium ion and a bismuth (Bi) compound on the surface of the active compound. The bismuth compound on the surface of the active compound can suppress possibly generated structural change of the anode active material and solve the reaction problem between the anode active material and electrolyte due to impedence reduction of acid generated near the anode active material, so as to prevent a transition metal which is composed of the anode active material from being dissolved. Therefore, the anode active material can improve the high-temperature storage characteristic and high-temperature cycle life characteristic of the secondary lithium battery, improve the lithium ion mobility in the electrolyte, bring an improved effect on a discharge potential and also enhance the charging and discharging characteristics, service life characteristic and multiplying power characteristic of the secondary lithium battery.

Description

technical field [0001] The present invention relates to a lithium secondary battery positive electrode active material and a lithium secondary battery containing the positive electrode active material, in particular to a lithium secondary battery positive electrode active material with excellent cycle life characteristics and high-rate charge-discharge characteristics and a lithium secondary battery containing the positive electrode active material secondary battery. Background technique [0002] Recently, there has been a sharp increase in demand for secondary batteries that can be repeatedly charged and discharged as power sources for communication portable electronic devices such as PDAs, mobile phones, and notebook computers, and electric bicycles and electric vehicles. Especially since the performance of these products mainly depends on their core components - rechargeable batteries, the requirements for high-performance batteries are very large. [0003] Usually, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/62H01M4/48H01M4/50H01M4/52C01G53/00C01G51/00C01G45/00C01G49/00C01G23/00C01G25/00C01G31/00C01G33/00C01G39/00C01G41/00H01M10/36H01M10/40
CPCY02E60/10
Inventor 宣良国朴炳天金炯培
Owner ENERCERAMIC
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