A kind of conductive phosphate cathode material and preparation method thereof
A cathode material and conductivity technology, applied in the fields of chemical industry and new energy materials, can solve the problems of increasing the conductivity and specific capacity of lithium iron phosphate, and achieve the effect of eliminating adverse effects and improving conductivity
Active Publication Date: 2021-12-07
安徽乾昌新能源科技有限公司
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AI Technical Summary
Problems solved by technology
Although the semiconductor nano-oxide coating and doping represented by zinc oxide is beneficial and harmless, it can only play a role in stabilizing cycle performance, and has little effect on increasing the conductivity and specific capacity of lithium iron phosphate.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0024] Heat-treat 100 g of the waste lithium iron phosphate positive electrode material at 550°C for 2 hours to oxidize the iron in the positive electrode material into high-valent iron phosphate, and at the same time make the binder carbonized to facilitate peeling off from the collector; pulverize the cooled positive electrode after oxidation and process Sieve with 100 meshes to recover the remaining aluminum collector material. Take 79g of sieved positive electrode powder, determine the mass content of aluminum in it to be 0.5%, immerse in 50°C 30% hydrochloric acid aqueous solution for 8 hours, and make it dissolve and transform into lithium chloride and iron phosphate hydrochloric acid aqueous solution. Filter the dissolved positive electrode material aqueous solution while it is hot, neutralize the filtrate with 15% mass concentration of ammonia water after cooling, and precipitate the co-precipitation of iron phosphate and aluminum hydroxide, filter and separate the prec...
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The invention relates to a conductive phosphate positive electrode material and a preparation method thereof. In the process of preparing the lithium iron phosphate positive electrode material, nano-zinc oxide is added, and an aluminum-doped zinc oxide conductive agent is formed in situ, and its chemical composition is LiFePO 4 ·x ZnO ·(0.01‑0.03)Al 2 o 3 , where, x=0.25‑0.5, the internal resistance of the prepared lithium iron phosphate positive electrode material is reduced from 5.5‑6.5Ω without conductive agent to 4.5‑5Ω, and the specific capacity is increased from 130mAh / g without conductive agent to 150‑160mAh / g. The coated and doped conductive material in the invention not only increases the conductivity and specific capacity of the lithium iron phosphate, but also eliminates the adverse effects of aluminum impurities. The aluminum-doped zinc oxide conductive material in the invention has good conductivity and low price, can replace existing graphite and conductive carbon materials, and has industrial application prospects.
Description
technical field [0001] The invention relates to a conductive phosphate positive electrode material and a preparation method thereof, in particular to a lithium iron phosphate conductive positive electrode material prepared by using waste and old lithium iron phosphate battery positive electrode materials as raw materials and a preparation method thereof, belonging to the fields of chemical industry and new energy materials . Background technique [0002] Due to its outstanding advantages such as long cycle life, good safety performance, and environmental protection, lithium iron phosphate batteries are widely used in passenger vehicles and energy storage. After the positive electrode of the lithium iron phosphate battery is repeatedly charged and discharged, the electrode material undergoes repeated expansion and contraction to separate it from the current collector, resulting in poor contact; The inside of the structure cannot be inserted and removed freely, resulting in a...
Claims
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IPC IPC(8): H01M4/58H01M4/62H01M10/0525H01M10/54C01D15/08C01B25/45C01G9/02
CPCH01M4/5825H01M4/624H01M10/0525H01M10/54C01D15/08C01B25/45C01G9/02C01P2004/80C01P2006/40C01P2006/80H01M2004/021H01M2004/028Y02W30/84Y02E60/10
Inventor 李建生周蕾李璐郭燕云韩璐张嘉铖王雪刘炳光
Owner 安徽乾昌新能源科技有限公司