In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 28, No. 18 ( 2013-09-28), p. 2584-2589
Abstract:
A novel graphene-modified LiMnPO 4 composite as a performance-improved cathode material for lithium-ion batteries has been prepared with LiH 2 PO 4 , Mn(CH 3 COO) 2 ·4H 2 O, and graphite oxide (GO) suspension by spray-drying method. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and galvanostatic charge–discharge tests are applied to characterize these materials. The structure analysis shows that LiMnPO 4 sheets with width of 100–200 nm and thickness of 20–30 nm are attached to the graphene sheets in pieces. The graphene sheets with good electrical conductivity serve as a conducting network for fast electron transfer between the active materials and charge collector, as well as buffered spaces to accommodate the volume expansion/contraction during the discharge/charge process. The electrochemical tests show that the composite cathode material could deliver a capacity of 105.1 mAh/g at 0.05 C in the voltage range of 2.5–4.4 V. Moreover, the cells showed fair good cycle ability over 50 cycles.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/jmr.2013.235
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2013
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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