props "paddingAngle" of <Pie />

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.js"></script>
<script src="https://npmcdn.com/react@15.6.2/dist/react-with-addons.min.js"></script>
<script src="https://npmcdn.com/react-dom@15.6.2/dist/react-dom.min.js"></script>
<script src="https://npmcdn.com/prop-types/prop-types.min.js"></script>
<script src="https://npmcdn.com/recharts/umd/Recharts.min.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

CSS

body {
  margin: 0;
}
#container {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  padding: 10px;
  width: 800px;
  height: 800px;
  background-color: #fff;
}

Babel + JSX

const { PieChart, Pie, Sector, Cell, Tooltip } = Recharts;
const data = [{ name: 'Group A', value: 400 }, { name: 'Group B', value: 300 },
{ name: 'Group C', value: 300 }, { name: 'Group D', value: 200 }];
const COLORS = ['#0088FE', '#00C49F', '#00C49F', '#FF8042'];

const RADIAN = Math.PI / 180;

const SimplePieChart = React.createClass({
    render() {
        return (
            <PieChart width={800} height={400} onMouseEnter={this.onPieEnter}>
<Tooltip/>
                <Pie
                    data={data}
                    cx={420}
                    cy={200}
                    startAngle={180}
                    endAngle={0}
                    cornerRadius={40}
                    innerRadius={60}
                    outerRadius={80}
                    fill="#8884d8"
                    paddingAngle={-15}
                >
                    {
                        data.map((entry, index) => <Cell 
                        fill={index === 0 || index === data.length - 1 ? COLORS[index % COLORS.length] : 'transparent'}
                        stroke={index === 0 || index === data.length - 1 ? COLORS[index % COLORS.length] : 'transparent'}
                        />)
                    }
                </Pie>
                <Pie
                    data={data}
                    cx={420}
                    cy={200}
                    startAngle={180}
                    endAngle={0}
                    cornerRadius={0}
                    innerRadius={60}
                    outerRadius={80}
                    fill="#8884d8"
                >
                    {
                        data.map((entry, index) => <Cell 
                        fill={index === 0 || index === data.length - 1 ? 'transparent' : COLORS[index % COLORS.length]}
                        stroke={index === 0 || index === data.length - 1 ? 'transparent' : COLORS[index % COLORS.length]}
                        />)
                    }
                </Pie>
           ...