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Ferrous phosphate doping lithium anode material and preparation process

A technology of lithium ferrous phosphate and cathode material, applied in electrode manufacturing, phosphorus compounds, battery electrodes, etc., can solve the problems of poor cycle performance and high cost

Inactive Publication Date: 2007-02-28
XINXIANG ZHONGKE SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that LiFePO was synthesized by high-temperature solid-state reaction 4 , the discharge capacity is 120mAh / g, the cycle performance is poor, the cycle capacity of 500 cycles remains 80% of the original, and the cost is high

Method used

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  • Ferrous phosphate doping lithium anode material and preparation process

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Comparison scheme
Effect test

Embodiment 1

[0006] 1. Lithium carbonate, ferrous salt, chromium salt, zinc salt, calcium salt, phosphorus source and glucose material are 1.02: 0.99: 0.005: 0.0025 according to the atomic ratio with Li: Fe: Cr: Zn: Ca: P: C : 0.0025: 1: 0.05 mixed for 2 hours and then ball milled for 4 hours, the ball milling speed was 100 rpm.

[0007] 2. Preheating the powder material obtained in the above process at a low temperature of 350° C. for 5 hours under the protection of an inert atmosphere.

[0008] 3. After the above-mentioned preheated material is subjected to high-speed ball milling for 2 hours, the ball milling speed is 100 rpm, and under the protection of an inert atmosphere, it is burned for 8 hours at a high temperature of 600 ° C, cooled and ball-milled through a 300-mesh sieve to produce The present invention relates to a lithium iron phosphate cathode material whose interior is doped and the surface is coated with carbon elements with good electrical conductivity.

Embodiment 2

[0010] 1. Lithium carbonate, ferrous salt, chromium salt, zinc salt, calcium salt, phosphorus source and glucose material are 1.04: 0.99: 0.005: 0.0025 by the atomic ratio with Li: Fe: Cr: Zn: Ca: P: C : 0.0025: 1: 0.05 mixed for 2 hours and then ball milled for 4 hours, the ball milling speed was 100 rpm.

[0011] 2. Preheating the powder material obtained in the above process at a low temperature of 350° C. for 5 hours under the protection of an inert atmosphere.

[0012] 3. After the above-mentioned preheated material is subjected to high-speed ball milling for 2 hours, the ball milling speed is 100 rpm, and under the protection of an inert atmosphere, it is burned for 8 hours at a high temperature of 600 ° C, cooled and ball-milled through a 300-mesh sieve to produce The present invention relates to a lithium iron phosphate cathode material whose interior is doped and the surface is coated with carbon elements with good electrical conductivity.

Embodiment 3

[0014] 1. Lithium carbonate, ferrous salt, chromium salt, zinc salt, calcium salt, phosphorus source and glucose material are 1.06: 0.99: 0.005: 0.0025 by the atomic ratio with Li: Fe: Cr: Zn: Ca: P: C : 1: 0.0025: 0.05 mixed for 2 hours and then ball milled for 4 hours, the ball milling speed was 100 rpm.

[0015] 2. Preheating the powder material obtained in the above process at a low temperature of 350° C. for 5 hours under the protection of an inert atmosphere.

[0016] 3. After the above-mentioned preheated material is subjected to high-speed ball milling for 2 hours, the ball milling speed is 100 rpm, and under the protection of an inert atmosphere, it is burned for 8 hours at a high temperature of 600 ° C, cooled and ball-milled through a 300-mesh sieve to produce The present invention relates to a lithium iron phosphate cathode material whose interior is doped and the surface is coated with carbon elements with good electrical conductivity.

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Abstract

The invention relates to a lithium anode material doped with phosphate ferrous iron, and relative preparation. Wherein, the product has common advantages of lithium battery, while its discharge capacity can reach 150mAh / g, the 500-circled capacity is over 90%, with low cost. The invention is characterized in that: its formula is LiFe0.99M0.01PO4 / C; M is Cr, Zn, and Ca; the preparation comprises that (1) mixing and grinding lithium carbonate, ferrous salt, chromate salt, zinc salt, calcium salt, phosphorus source and glucose; (2), preheating the powder material in step (1) in inertia gas and low temperature; (3), grinding the material in step (2), under inertia gas, to be burnt, cooled and screened at 300-deal screen. The invention can be used in the anode of lithium battery.

Description

Technical field: [0001] The invention relates to a positive electrode material of a battery and a preparation method thereof, in particular to a positive electrode material doped with lithium iron phosphate and a preparation process thereof. Background technique: [0002] Electrode material is one of the key problems that lithium-ion secondary batteries need to solve, while cathode material is the bottleneck restricting the development of lithium-ion batteries, which determines the performance, price and development of lithium-ion batteries. It is well known that the commercialized LiCoO 2 and the widely studied LiNiO 2 with LiMn 2 o 4 Cathode materials have their own advantages, but LiNiO 2 Difficult to synthesize, not easy to industrialized production; LiMn 2 o 4 The actual specific capacity is low and the cycle performance is poor. The olivine-type LiFePO 4 As a new type of positive electrode material for lithium-ion secondary batteries, it has the advantages of t...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/12Y02E60/10
Inventor 杨书廷王涛李述中崔成伟尹艳红李敬磊韩金东张玉亮王德民周奥博
Owner XINXIANG ZHONGKE SCI&TECH
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