Table 1 The electrochemical performance of various electrodes in aqueous electrolytes.

From: Manganese oxide electrode with excellent electrochemical performance for sodium ion batteries by pre-intercalation of K and Na ions

Active material

Capacity (mA h g−1)

Current density

Efficiency (%)

Ref.

M2

133.8

1.5 C

100

This work

Na0.58MnO2·0.48H2O

80.0

1 C

60

29

Na4Mn9O18

45

0.125 C

—

30

NaMnO2

60

1 C

91.5

31

K0.27MnO2

64.7

0.2 A g−1

74

38

Na0.95MnO2

60.0

2 C

92

39

Na0.44MnO2

40

0.1 C

—

40

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